Nabtesco RV N Series User manual

ERD15003B
Oct 1, 2016
Precision Reduction Gear RVTM
N series
Operation Manual
<Applicable model>
RV-N△
above indicates the torque code.
△above indicates the series code.
For the applicable models, refer to “Model” indicated on the shipping label of the product.
This manual must be thoroughly read and understood before using the product.
Be sure to deliver this operation manual to the system manager and the person in
charge of the operation.
Keep this manual in the specified location so that it can be immediately referred to
whenever necessary.
®

Contents
Important Information ......................................................................................................i
1. Intended use of this product......................................................................................................................i
2. Rules to ensure safe use of this product................................................................................................. i
3. Sharing of hazard information with users................................................................................................. ii
4. Product disposal..................................................................................................................................... ii
5. Other important notes .............................................................................................................................. ii
About This Manual..........................................................................................................iii
1. Users of this manual................................................................................................................................ iii
2. Copyrights ............................................................................................................................................... iii
Warranty .......................................................................................................................... iv
Glossary ........................................................................................................................... v
Chapter 1 About Safety ................................................................................................1
1.1. About warnings....................................................................................................................................1
1.2. Type and indication of warning............................................................................................................1
1.3. General precautions ............................................................................................................................2
Chapter 2 Product Overview ........................................................................................3
2.1. Name of each section..........................................................................................................................3
2.2. Parts codes of catalog products..........................................................................................................3
Chapter 3 Transportation and Storage of Product.....................................................4
3.1. Transportation .....................................................................................................................................4
3.2. Storage................................................................................................................................................5
Chapter 4 Preparations for Installation .......................................................................6
4.1. Installation environment ......................................................................................................................6
4.2. Preparation of required components...................................................................................................7
4.3. Unpacking .........................................................................................................................................16
4.4. Lifting of this product .........................................................................................................................20
Chapter 5 Installation..................................................................................................21
5.1. Bolt tightening torque ........................................................................................................................21
5.2. Installation work.................................................................................................................................22
Contents

Contents
Chapter 6 Filling the Lubricant .................................................................................. 32
6.1. Precautions when handling the lubricant ..........................................................................................32
6.2. Reduction gear mounting direction and amount of lubricant ............................................................34
6.3. Lubricant filling procedure .................................................................................................................37
Chapter 7 Operation.................................................................................................... 39
7.1. Checking before operation ................................................................................................................39
7.2. Break-in operation .............................................................................................................................39
7.3. Precautions for operation ..................................................................................................................39
Chapter 8 Maintenance and Inspection..................................................................... 41
8.1. Precautions on maintenance.............................................................................................................41
8.2. Daily inspection .................................................................................................................................41
8.3. Lubricant replacement.......................................................................................................................42
Appendix: Design Scheme of Input Gear .................................................................. 44
NABTESCO CONTACT INFORMATION
Contents

Important Information
1. Intended use of this product
This product was designed and manufactured as a reduction gear that decelerates the rotation of the motor and
transmits the rotational torque. Do not use this product for other purposes.
Do not modify the reduction gear or use it outside its specified range. This could cause injury or
damage to the reduction gear.
The specifications indicated in the product catalog are based on Nabtesco evaluation methods. This
product should only be used after confirming that it is appropriate for the operating conditions of
your system. Failure to do so could cause injury or damage to the reduction gear.
2. Rules to ensure safe use of this product
It is impossible for Nabtesco Corporation (referred to as “Nabtesco” hereafter) to foresee any potential hazards
related to this product and hazards caused by human errors or peripheral devices.
There are also various points that must be observed and operations that are prohibited in relation to the use of
this product, but it is also impossible to note all of them in this manual.
For this reason, it is necessary to take appropriate safety measures when operating this product, in addition to
the points noted in this manual.
The particularly important information for safe handling of this product is noted below. This information
applies to all workers involved, including the manager and supervisor of this product.
The “procedures” referred to in this manual indicate all the acts performed on this product during
transportation, installation, operation, and maintenance/inspection.
Be sure to read this manual
Before using this product, thoroughly read this manual and understand all the content of this manual.
Also, observe the safety precautions described in this manual.
Conditions for workers
• The worker must have a fundamental knowledge of this product
• The worker must be aware of the potential hazards of this product and have adequate knowledge to
avoid hazardous situations
• The worker must be able to take appropriate measures to avoid hazardous situations
Important
Information
i

Important Information
Observe the relevant laws, regulations, ordinances, and bylaws.
Observe the relevant laws, regulations, ordinances, and bylaws enacted by the related countries and
local governments.
Prevention of accidents
To prevent accidents, do not perform any procedures not noted in this manual. Also, do not use this
product for any purposes other than those noted at the beginning of this manual.
If any abnormalities are found, take appropriate measures immediately to prevent any accidents,
serious injury, or damage.
• Everyone, including workers and supervisors, must voluntarily take measures to ensure safety and
well-being, as this can prevent accidents.
3. Sharing of hazard information with users
When selling or transferring this product embedded in a device, etc., hand this manual to the person who
actually uses or manages the device (the person/group in charge). Or, add the necessary information concerning
handling and maintenance procedures for preventing the accidents and failures described in this manual to the
contents of the operation manual of the device.
4. Product disposal
When disposing of this product, drain the lubricant completely and handle it according to the ordinances of the
local government and entrust the disposal to an industrial waste disposal specialist.
5. Other important notes
It is strictly prohibited to reverse-engineer the internal parts of this product.
ii

About This Manual
1. Users of this manual
This manual is intended for native speakers of English. If this product is operated by non-native speakers of
English, the customer is responsible for conducting safety training and giving operation instructions to those
workers.
2. Copyrights
The copyright for this manual belongs to Nabtesco Corporation. Unauthorized reprinting, reproduction,
copying, or translation of this manual in whole or in part is strictly prohibited.
About This Manual
iii

Warranty
1. In the case where Nabtesco confirms that a defect of the Product was caused due to
Nabtesco’s design or manufacture within the Warranty Period of the Product, Nabtesco
shall repair or replace such defective Product at its cost. The Warranty Period shall be
from the delivery of the Product by Nabtesco or its distributor to you (“Customer”) until
the end of one (1) year thereafter, or the end of two thousand (2,000) hours from the
initial operation of Customer's equipment incorporating the Product at end user's
production line, whichever comes earlier.
2. Unless otherwise expressly agreed between the parties in writing, the warranty
obligations for the Product shall be limited to the repair or replacement set forth herein.
OTHER THAN AS PROVIDED HEREIN, THERE ARE NO WARRANTIES ON THE
PRODUCT, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY
IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE.
3. The warranty obligation under Section 1 above shall not apply if:
a) the defect was caused due to the use of the Product deviated from the Specifications or
the working conditions provided by Nabtesco;
b) the defect was caused due to exposure to foreign substances or contamination (dirt,
sand etc.);
c) lubricant or spare part other than the ones recommended by Nabtesco was used in the
Product;
d) the Product was used in an unusual environment (such as high temperature, high
humidity, a lot of dust, corrosive/volatile/inflammable gas, pressurized/depressurized
air, under water/liquid or others except for those expressly stated in the
Specifications);
e) the Product was disassembled, re-assembled, repaired or modified by anyone other
than Nabtesco;
f ) the defect was caused due to the equipment into which the Product was installed;
g) the defect was caused due to an accident such as fire, earthquake, lightning, flood or
others; or
h) the defect was due to any cause other than the design or manufacturing of the Product.
4. The warranty period for the repaired/replaced Product/part under Section 1 above shall be
the rest of the initial Warranty Period of the defective Product subjected to such
repair/replace.
Warranty
iv

Glossary
Rated service life
The lifetime resulting from the operation with the rated torque and the rated output speed is referred to as
the “rated service life”.
Allowable acceleration/deceleration torque
When the machine starts or stops, the load torque to be applied to the reduction gear is larger than the
constant-speed load torque due to the effect of the inertia torque of the rotating part. In such a situation, the
allowable torque during acceleration/deceleration is referred to as “allowable acceleration/deceleration
torque”.
Note: Be careful that the load torque, which is applied at startup and stop, does not exceed the allowable
acceleration/deceleration torque.
Momentary maximum allowable torque
A large torque may be applied to the reduction gear due to execution of emergency stop or by an external
shock. In such a situation, the allowable value of the momentary applied torque is referred to as
“momentary maximum allowable torque”.
Note: Be careful that the momentary excessive torque does not exceed the momentary maximum allowable
torque.
Allowable output speed
The allowable value for the reduction gear’s output speed during operation without a load is referred to as
the “allowable output speed”.
Note: Depending on the conditions of use (duty ratio, load, ambient temperature), the reduction gear surface
temperature may exceed 60°C even when the speed is under the allowable output speed. In such a case,
either take cooling measures or use the reduction gear at a speed that keeps the surface temperature at 60°C
or lower.
Allowable Moment and Maximum Thrust Load
The external load moment or thrust load may be applied to the reduction gear during normal operation. The
allowable values at this time are referred to as “allowable moment” and “maximum thrust load”
respectively.
Note 1: The above specification values are noted in the catalog or separately provided specification sheet.
Note 2: The “reduction gear” described in this manual indicates the N series of the product.
Glossary
Load torque
External shock torque
Max. torque for startup
Constant torque
Time
Max. torque
for stop
Shock torque at emergency stop
V

Chapter 1 About Safety
1
Chapter 1 About Safety
The safety precautions noted in this chapter should be used as guidelines to prevent injury of workers who
perform transportation, installation, operation, and maintenance of this product, as well as damage to the
product.
1.1. About warnings
This manual alerts workers to hazardous situations and precautions related to this product in the following
manner:
1. Safety regulations are described in Chapter 1 “About safety” in this manual
2. Warning statements are noted in this manual
1.2. Type and indication of warning
Warnings for potential hazards during operation are given according to the following four categories in this
manual. If you fail to observe these warning statements, it could result in lethal injury or serious damage and
malfunction of the product.
Indicates a hazardous situation that, if not avoided, is highly likely to result in
death or serious injury.
Indicates a potentially hazardous situation that, if not avoided, could result in
death or serious injury.
Indicates a potentially hazardous situation that, if not avoided, could result in
minor or moderate injury.
Indicates a potentially hazardous situation that, if not avoided, could result in
physical damage.
Provides important information for correct use of this product, as well as
supplemental explanation for the main body of the text or other information that
helps to prevent erroneous operation.
Note
Important

Chapter 1 About Safety
2
1.3. General precautions
This section describes general precautions for safe use of this product. For precautions concerning
transportation, installation, operation, maintenance, and inspection, be sure to confirm the contents of the
relevant chapter.
Do not modify or disassemble the reduction gear in a manner not described in this manual. It could
cause injury or damage to the reduction rear.
Transportation, installation, operation, maintenance, and inspection of the reduction gear must be
performed by personnel who fully understand this manual. The person in charge of the operation
and manager of the reduction gear must not allow anyone without an understanding of the contents
of this manual to operate it. It could cause injury or damage to the reduction gear.
Do not put your fingers or any object into the opening of the reduction gear. If a belt or chain is used
for connection of the drive sections, do not put your fingers or any object into the clearance of the
protective cover, etc., as it could cause injury.
If any abnormalities or damage to the reduction gear are found, stop the operation immediately.
Incorrect motion could cause injury.
The reduction gear could be extremely hot during operation. After stopping the operation, never
touch the reduction gear before it is completely cooled. Touching the reduction gear could cause
burns.
Handle the lubricant according to the instructions given in this manual. Failure to do so could impair
your health.
This reduction gear is not filled with lubricant. Fill the reduction gear with an appropriate amount of
Nabtesco-recommended lubricant before use. Failure to do so could cause damage to the reduction
gear.
Return the tools and other necessary items to the specified location after use. If a tool, bolt, nut, or
other foreign object is trapped in the system, it could cause damage to the reduction gear.
Avoid excessive impact or vibration of the reduction gear. It could cause damage to the reduction
gear.
Note

Chapter 2 Product Overview
3
Chapter 2 Product Overview
This chapter describes provides an overview of this product.
2.1. Name of each section
This section provides an explanation of the name of each section.
If the shape of the actual section differs from the illustration below, refer to the separately provided “External
dimensions” drawings and specification sheet.
Fig. 2-1
The shape of the reduction gear may differ from the illustration below depending on the ordered
specifications.
2.2. Parts codes of catalog products
The parts codes are assigned as follows for the N series catalog products.
For detailed specifications of those products not included in the catalog, refer to the separately provided
“External dimensions” drawings and specification sheet. If anything is unclear, refer to our contact
information.
<Parts codes of catalog products>
Example) P40AN001B00, P40AN001D00
The third digit from the end of the parts number (“B” or “D”) indicates a catalog product.
Any other codes indicate products not included in the catalog.
For the parts number, check “Parts number” indicated on the shipping label of the product (Fig. 4-4).
Note: The last two digits of the parts code, are within the range from 00 to 99 (“00” in the above parts code),
indicate the revision code.
Tapped hole for shaft
installation
Seal cap
Hole for
injecting/draining
grease
Shaft
O-ring groove on
the shaft
(No O-ring groove is provided on
the shafts of RV-25N, 42N, 60N,
80N, 100N, and 125N.)
Case
O-ring groove on the case
Standard input gear
(Optional)
Spur gear
Removal tap
(For disassembling
from machine)
Case fixing
hole Tapped hole for
handling/lifting bolt
Important

Chapter 3 Transportation and Storage of Product
4
Chapter 3 Transportation and Storage of Product
This chapter describes the transportation and storage of this product.
3.1. Transportation
• Transport the product in an appropriate manner according to the weights indicated in the separately provided
“External dimensions” drawings and specifications.
• If the reduction gear needs to be lifted after unpacking, also refer to “4.4 Lifting of this product”.
• For the catalog products described in “2.2. Parts codes of catalog products”, refer to the weights of the
reduction gears listed in Table 3-1.
• Do not stack the packing boxes containing this product too high.
• Avoid excessive impact or vibration of the reduction gear.
Table 3-1
Model Weight (kg) Model Weight (kg)
RV-25N 3.8 RV-125N 13.9
RV-42N 6.3 RV-160N 22.1
RV-60N 8.9 RV-380N 44
RV-80N 9.3 RV-500N 57.2
RV-100N 13.0 RV-700N 102
If the packing boxes containing the reduction gear are stacked too high during transportation, they
may collapse and fall down, and cause injury or damage to the reduction gear.
Applying excessive impact or vibration to the reduction gear could cause damage to the reduction
gear.
Each weight listed in the above table, as well as in the separately provided “External dimensions”
drawings and specification sheet, indicates the weight of the reduction gear only. It does not include
the weight of the packing box or optional parts, etc.
The actual weight of the reduction gear may slightly differ from that listed in the above table,
depending on the specifications.
Note
Important

Chapter 3 Transportation and Storage of Product
5
3.2. Storage
To avoid rust, corrosion, or deterioration of the sealing material, etc., and collapse of stored packing boxes,
store the product in the following location.
• Location where the ambient temperature is between -10°C to 40°C
• Location where the humidity is less than 85% and no condensation occurs
• Location that is not directly affected by wind and rain
• Location that is free from combustible/volatile/corrosive gas or dust.
• Stable location that is free from any danger of collapse
• Location with little vibration
When storing the reduction gears, do not stack too many packing boxes. They may collapse and fall
down, causing injury or damage to the reduction gear.
Store the reduction gear under the same conditions as those before unpacking. If it is left upside
down, it could cause damage to the reduction gear.
Although the reduction gear is coated with rust prevention oil before shipping, it is not designed for
long-term storage. If it is stored for a long period, check the condition of the reduction gear
periodically and perform rust prevention treatment as necessary. If rust occurs, it could cause the
leakage of lubricant or premature damage to the reduction gear.
If the reduction gear is used or operated after it has not been used for a long period of time, confirm
that it is free from rust or corrosion and that the sealing material is free from deformation or cracks
beforehand. If the reduction gear is used without checking these points, it could cause the leakage
of lubricant or premature damage to the reduction gear.
Note

Chapter 4 Preparations for Installation
6
Chapter 4 Preparations for Installation
This chapter describes the preparation for installing this product.
Before designing the equipment, take care regarding the following precautions.
• When the reduction gear is used for human transportation equipment, install an effective safety unit as a
fail-safe mechanism, in case of an unexpected failure in the reduction gear.
• When the reduction gear is used for elevating equipment, install an effective safety unit for preventing falls
caused by idle running as a fail-safe mechanism, in case of an unexpected failure in the reduction gear.
• Install an oil receiver, etc., to prevent damage in case of lubricant leakage due to a failure or lifetime
expiration.
• As this product may have residual rust prevention agent coated on it before shipping, wipe it off as necessary.
When the reduction gear is used for human transportation equipment, install an effective safety unit
as a fail-safe mechanism, in case of an unexpected failure in the reduction gear. If you fail to install it,
it could cause injury in case the equipment goes out of control or falls off.
When the reduction gear is used for elevating equipment, install an effective safety unit for
preventing falls caused by idle running as a fail-safe mechanism, in case of an unexpected failure in
the reduction gear. If you fail to install it, it could cause injury in case the elevating unit falls off.
4.1. Installation environment
Use this product under the following environment:
• Location where the ambient temperature is between -10°C to 40°C
• Location where the humidity is less than 85% and no condensation occurs
• Location where the altitude is less than 1,000 m
• Well-ventilated location
Do not install the reduction gear at the following locations.
• Location where a lot of dust is collected
• Outdoors that can be directly affected by wind and rain
• Location near the environment that contains combustible/explosive/corrosive gases and flammable materials
• Location where the magnetic fields or vibration occur

Chapter 4 Preparations for Installation
7
If the required installation environment cannot be established / met, refer to our contact information
in advance.
When using this product under special conditions (clean room, equipment for food, medical
equipment, concentrated alkali, high-pressure steam, etc.), refer to our contact information in
advance.
4.2. Preparation of required components
• The following components and materials are required for installing this product. Check the
components/materials and prepare them at each customer’s site.
• If the shape of the actual section differs from the illustration below, refer to the separately provided “Outer
dimensions” drawings and specification sheet.
• Prepare the input gear, motor mounting flange, case installation component, and shaft installation component
that have been designed and manufactured based on the separately provided “External dimensions” drawings,
specification sheet, and catalog.
Fig. 4-1
If O-ring (II) and high-torque seal washer cannot be used, use the liquid sealants.
The actual components may differ from the required components shown in the above illustration,
depending on the customer’s equipment.
O-ring (II)
or liquid sealant
Hexagon socket
head cap screw
Belleville
spring washer
Shaft installation
component
Case installation
component
O-ring (I)
Motor mounting
flange
Oil seal
Hexagon socket
head cap screw
Belleville spring washer
Input gear and
installation
component
Motor
Motor mounting
bolt
Important
Important
Plug for
injecting/draining
grease
Plug for injecting/draining grease

Chapter 4 Preparations for Installation
8
4.2.1. Input gear
• Prepare the input gear for motor rotation into the reduction gear. For the design of the input gear, refer to
“Appendix: Design Scheme of Input Gear”.
The prepared gear teeth must meet the specifications and materials described in “Appendix: Design
Scheme of Input Gear”. An operation error due to damage or wear of the gear teeth could cause
injury.
If the input gear has an oil sealing surface, take extra care so that no scratch will be made on the oil
sealing surface when handling the input gear. Any scratches could cause the leakage of lubricant.
Take extra care so that no scratch will be made on the gear tooth section when handling the input
gear. Any scratches could cause abnormal noise.
The customer is requested to prepare the oil seals used for sealing the circumference of the input
gear.
The standard input gear, which is an optional component, is not provided with installation
components such as bolts and keys. Prepare them as necessary at each customer’s site.
Note
Important

Chapter 4 Preparations for Installation
9
4.2.2. Flange and its installation components
Motor mounting flange
• Prepare the motor mounting flange for fixing the motor on the reduction gear input side.
• In order to avoid contact with reduction gear components, refer to the sizes indicated in the “External
dimensions” drawings when designing the motor mounting flange.
• Confirm that a tapped hole for injecting/draining grease is installed in the motor mounting flange. It will be
necessary for filling or replacing the lubricant after installing the reduction gear.
• Design the motor mounting flange to the following accuracy. If the installation accuracy is poor, it will result
in vibration, noise, and increase in backlash. If a model other than those listed below is used, refer to our
contact information.
<Installation accuracy>
Table 4-1
Fig. 4-2
Model
Concentricity
tolerance
Motor mounting
flange
Model
Concentricity
tolerance

Chapter 4 Preparations for Installation
10
Confirm that the design of the prepared motor mounting flange conforms to the size and quantity of
the case mounting bolts indicated in the separately provided “External dimensions” drawings and
specification sheet. For the catalog products described in “2.2. Parts codes of catalog products”,
refer to the size and quantity of the bolts listed in Table 4-2 in “4.2.3 Reduction gear mounting bolts”.
If no tapped hole for injecting/draining grease is installed in the motor mounting flange, the lubricant
cannot be filled/replaced after installing the reduction gear.
Case installation component
Prepare the case installation component for the reduction gear. The component can also be embedded in the
motor mounting flange.
Confirm that the design of the prepared case installation component conforms to the size and
quantity of the case mounting bolts indicated in the separately provided “External dimensions”
drawings and specification sheet. For the catalog products described in “2.2. Parts codes of catalog
products”, refer to the size and quantity of the bolts listed in Table 4-2 in “4.2.3 Reduction gear
mounting bolts”.
Shaft installation component
• Prepare the installation component for the output shaft of the reduction gear.
• Confirm that the component is structured so that the lubricant can be sealed with an O-ring or liquid sealant.
• Confirm that a tapped hole for injecting/draining grease is installed in the shaft installation component. It will
be necessary for filling or replacing the lubricant after installing the reduction gear.
Confirm that the design of the prepared shaft installation component conforms to the size and
quantity of the shaft mounting bolts indicated in the separately provided “External dimensions”
drawings and specification sheet. For the catalog products described in “2.2. Parts codes of catalog
products”, refer to the size and quantity of the bolts listed in Table 4-3 in “4.2.3 Reduction gear
mounting bolts”.
If no tapped hole for injecting/draining grease is installed in the shaft installation component, the
lubricant cannot be filled/replaced after installing the reduction gear.

Chapter 4 Preparations for Installation
11
4.2.3. Reduction gear installation bolts
• Prepare bolts according to the size and quantity of the motor mounting flange, case installation bolts and
shaft installation bolts indicated in the separately provided “External dimensions” drawings and specification
sheet.
• For the catalog products described in “2.2. Parts codes of catalog products”, refer to the size and quantity of
the bolts listed in Table 4-2 and Table 4-3.
• Select the appropriate bolt length based on the mounting dimensions of the components prepared by the
customer and the reduction gear.
• Prepare the following bolts recommended by Nabtesco:
Hexagon socket
head cap screw
JIS B 1176: 2006
Strength class JIS B 1051: 2000 12.9
Thread JIS B 0209: 2001 6 g
For motor mounting flange and case
installation component
Table 4-2
For shaft installation component
Table 4-3
Model
Nominal size
× pitch
(mm)
Required Qty. Model
Nominal size ×
pitch
(mm)
Required Qty.
RV-25N M5 × 0.8 16 RV-25N M6 × 1.0
M10 × 1.5
3
6
RV-42N M6 × 1.0 16 RV-42N M10 × 1.5 9
RV-60N M6 × 1.0 20 RV-60N M8 × 1.25 23
RV-80N M8 × 1.25 16 RV-80N M8 × 1.25 24
RV-100N M8 × 1.25 18 RV-100N M10 × 1.5 21
RV-125N M10 × 1.5 16 RV-125N M10 × 1.5 21
RV-160N M10 × 1.5 16 RV-160N M12 × 1.75 18
RV-380N M12 × 1.75 24 RV-380N M12 × 1.75 33
RV-500N M12 × 1.75 28 RV-500N M12 × 1.75 33
RV-700N M12 × 1.75 32 RV-700N M16 × 2.0 26

Chapter 4 Preparations for Installation
12
(Unit: mm)
Fig. 4-3
4.2.4. Serrated lock washer for hexagon socket head cap screw
Prepare the following Serrated lock washer for a hexagon socket head cap screw recommended by Nabtesco.
Name: Belleville spring washer (made by Heiwa Hatsujyo Industry Co., Ltd.)
Corporation
symbol: CDW-H, CDW-L (Only for M5)
Material: S50C to S70C
Hardness: HRC40 to 48
Table 4-4
When using any equivalent washer, select it with special care given to its outside diameter (D).
Nominal
size
ID and OD of Belleville
spring washer t H
ød øD
5 5.25 8.5 0.6 0.85
6 6.4 10 1.0 1.25
8 8.4 13 1.2 1.55
10 10.6 16 1.5 1.9
12 12.6 18 1.8 2.2
14 14.6 21 2.0 2.5
16 16.9 24 2.3 2.8
18 18.9 27 2.6 3.15
20 20.9 30 2.8 3.55
Assemble the bolt
so that the
bolt head faces this side
Important