INTORQ BFK470 Series Quick guide

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setting the standard
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INTORQ BFK470
Spring-applied brake with electromagnetic release
Translation of the Original Operating Instructions

INTORQ | BA 14.0199 | 08/2016 2
This documentation applies to the:
Product key
Not coded: Supply voltage, hub bore hole, options
INTORQ B FK -
A
A
B
C
D
Legend for the product key
INTORQ BFK470
Product group Brake
Product type Spring-applied brake
Type 470
Size 06, 08, 10, 12, 14, 16, 18
A
A
B
C
D

INTORQ | BA 14.0199 | 08/2016 3
Identification
Document history
Refer to www.intorq.de for the latest version of these operating instructions.
Packaging label Example
Manufacturer Bar code
Type (see product key) Type No.
Designation Qty. per box
Rated voltage Rated power Rated torque Hub diameter Packaging date
Note CE mark
Name plate Example
Manufacturer CE mark
Type (see product key)
Designation
Rated voltage Rated power Hub diameter
Type No. Rated torque
Date of manufacture
Material number Version Description
33001439 1.0 01/2012 TD09 First edition
33001439 1.1 03/2012 TD09 Supplemented the technical data
33001439 1.2 10/2012 TD09 Added to the "Brake assembly" chapter
Updated the "Abbreviations used" table
Supplemented the characteristics, rated data and operating times
33001439 2.0 05/2013 TD09 Degree of protection changed
Added note about the end shield characteristics
Shaft characteristic defined, "Mechanical installation" chapter
"Checking the brake" chapter (maintenance and repair) supple-
mented
33001439 3.0 05/2013 TD 09 Text with regard to the disengagement time updated
33001439 3.1 03/2014 SC Restructured FM; note concerning brake seal 23
33001439 4.0 01/2015 SC Harmonized connection diagrams
33001439 5.0 08/2016 SC Additional sizes: 06, 08, 10, 12

INTORQ | BA 14.0199 | 08/2016 4
Contents
1 Preface and general information ...........................................................................................................................5
1.1 About these Operating Instructions ...............................................................................................................5
1.2 Terminology used ..........................................................................................................................................5
1.3 Conventions in use ........................................................................................................................................5
1.4 Abbreviations used ........................................................................................................................................6
1.5 Safety instructions and notices .....................................................................................................................7
1.6 Scope of delivery ...........................................................................................................................................8
1.7 Disposal ........................................................................................................................................................8
1.8 Drive systems ................................................................................................................................................9
1.9 Legal regulations ...........................................................................................................................................9
2 Safety instructions ...............................................................................................................................................10
2.1 General safety instructions ..........................................................................................................................10
2.2 Application as directed ................................................................................................................................11
3 Technical specifications ......................................................................................................................................12
3.1 Product description .....................................................................................................................................12
3.2 Rated data ...................................................................................................................................................14
3.3 Rated data (dimensioning data) electrical data ...........................................................................................16
3.4 Switching energy / operating frequency ......................................................................................................18
3.5 Emissions ....................................................................................................................................................19
4 Mechanical installation ........................................................................................................................................20
4.1 Important notes ...........................................................................................................................................20
4.2 Assembly .....................................................................................................................................................22
5 Electrical installation ............................................................................................................................................25
5.1 Important notes ...........................................................................................................................................25
5.2 Electrical connection ...................................................................................................................................25
5.3 Technical data for inductive proximity sensors ...........................................................................................30
5.4 Minimum bend radius for the brake connection line ....................................................................................31
5.5 Bridge/half-wave rectifier (optional) .............................................................................................................31
6 Commissioning and operation ............................................................................................................................34
6.1 Important notes ...........................................................................................................................................34
6.2 Function checks before commissioning ......................................................................................................35
6.3 Brake with proximity sensor ........................................................................................................................36
6.4 Commissioning ............................................................................................................................................37
6.5 During operation ..........................................................................................................................................37
7 Maintenance and repair ......................................................................................................................................38
7.1 Wear of spring-applied brakes ....................................................................................................................38
7.2 Inspections ..................................................................................................................................................39
7.3 Maintenance ................................................................................................................................................40
7.4 Spare-parts list ............................................................................................................................................43
7.5 Electrical accessories ..................................................................................................................................43
8 Troubleshooting and fault elimination ...............................................................................................................44

Preface and general information
INTORQ | BA 14.0199 | 08/2016 5
1 Preface and general information
1.1 About these Operating Instructions
❚These Operating Instructions will help you to work safely with the spring-applied brake with electromag-
netic release. Theycontain safety instructions that must be followed.
❚All persons working on or with electromagnetically released spring-applied brakes must have the Oper-
ating Instructions available and observe the information and notes relevant for them.
❚The Operating Instructions must always be in a complete and perfectly readable condition.
1.2 Terminology used
1.3 Conventions in use
This document uses the following styles to distinguish between different types of information:
Term In the following text used for
Spring-applied brake Spring-applied brake with electromagnetic release
Drive system Drive systems with spring-applied brakes and other drive compo-
nents
Spelling of numbers Decimal separator Point The decimal point is always used.
For example: 1234.56
Symbols Page reference Reference to another page with additional
information
For example: 16 = refer to page 16
Wildcard Wildcard for options, selections
For example: BFK458- = BFK458-10
Note Important notice about ensuring smooth
operations or other key information.

Preface and general information
INTORQ | BA 14.0199 | 08/2016 6
1.4 Abbreviations used
Letter symbol Unit Designation
FRN Rated frictional force
I A Current
IHA Holding current, at 20 °C and holding voltage
ILA Release current, at 20 °C and release voltage
INA Rated current, at 20 °C and rated voltage
MANm Tightening torque of fixing screws
Mdyn Nm Braking torque at a constant speed of rotation
MKNm Rated torque of the brake, rated value at a relative speed of rotation of
100 rpm
nmax rpm Maximum occurring speed of rotation during the slipping time t3
PHW Coil power during holding, after voltage change-over and 20 °C
PLW Coil power during release, before voltage change-over and 20 °C
PNW Rated coil power, at rated voltage and 20 °C
Q J Quantity of heat/energy
QEJ Max.permissiblefrictionenergyforone-timeswitching,thermalparameter of
the brake
QRJ Braking energy, friction energy
QSmax J Maximally permissible friction energy for cyclic switching, depending on the
operating frequency
RNOhms Rated coil resistance at 20 °C
Sh1/h Switching frequency:the number of switchingoperations evenlyspread over
the time unit
Shue 1/h Transition operating frequency, thermal parameter of the brake
Shmax 1/h Maximum permissible operating frequency, depending on the friction energy
per switching operation
sLmm Air gap: the lift of the armature plate while the brake is switched
sLN mm Rated air gap
sLmin mm Minimum air gap
sLmax mm Maximum air gap
t1ms Engagement time, sum of the delay time and braking torque - rise time
t1= t11 + t12
t2ms Disengagement time, time from switching the stator until reaching 0.1 Mdyn
t3ms Slipping time, operation time of the brake (according to t11) until standstill

Preface and general information
INTORQ | BA 14.0199 | 08/2016 7
1.5 Safety instructions and notices
The following icons and signal words are used in this document to indicate dangers and important safety in-
formation:
Safety instructions
Structure of safety instructions:
t11 ms Delay during engagement (time from switching off the supply voltage to the
beginning of the torque rise)
t12 ms Rise time of the braking torque, time from the start of torque rise until reach-
ing the braking torque
tue s Overexcitation time
UVVoltage
UHV DC Holding voltage, after voltage change-over
ULV DC Release voltage, before voltage change-over
UNV DC Rated coil voltage; in the case of brakes requiring a voltage change-over,
UNequals UL
SIGNAL WORD
Icon
Indicates the type of danger
Signal word
Characterises the type and severity of danger
Note
Describes the danger
Possible consequences
❚List of possible consequences if the safety instructions are disregarded.
Protective measure
❚List of protective measures to avoid the danger.
Letter symbol Unit Designation

Preface and general information
INTORQ | BA 14.0199 | 08/2016 8
Danger level
1.6 Scope of delivery
After receipt of the delivery, check immediately whether the items delivered match the accompanying pa-
pers. INTORQ does not accept any liability for deficiencies claimed subsequently.
❚Claim visible transport damage immediately to the deliverer.
❚Claim visible deficiencies or incomplete deliveries immediately to INTORQ GmbH& Co. KG.
1.7 Disposal
The spring-applied brake consists of different types of material.
❚Recycle metals and plastics.
❚EnsureprofessionaldisposalofassembledPCBsaccordingtotheapplicableenvironmentalregulations.
DANGER
DANGER indicates a hazardous situation which, if not avoided, will result in death or serious
injury.
WARNING
WARNING indicates a potentially hazardous situation which, if not avoided, could result in
death or serious injury.
CAUTION
CAUTION indicates a hazardous situation which, if not avoided, could result in minoror mod-
erate injury.
NOTICE
Noticeaboutaharmfulsituationwithpossibleconsequences:theproductitselforsurrounding
objects could be damaged.

Preface and general information
INTORQ | BA 14.0199 | 08/2016 9
1.8 Drive systems
Labelling
Drive systems and components are unambiguously designated by the indications on the name plate.
Manufacturer: INTORQ GmbH & Co. KG, Wülmser Weg 5, D-31855 Aerzen, Germany
1.9 Legal regulations
Liability
❚The information, data and notes in these Operating Instructions met the state of the art at the time of
printing.Claimsreferringtodrivesystemswhichhavealreadybeensuppliedcannotbederivedfromthis
information, illustrations and descriptions.
❚We do not accept any liability for damage and operating interference caused by:
- inappropriate use
- unauthorised modifications to the product
- improper work on or with the drive system
- operating errors
- disregarding the documentation
Warranty
❚Terms of warranty: Refer to the terms of sale and delivery for INTORQ GmbH & Co. KG.
❚Warranty claims must be made to INTORQ immediately after the defects or faults are detected.
❚The warranty is void in all cases when liability claims cannot be made.

Safety instructions
INTORQ | BA 14.0199 | 08/2016 10
2 Safety instructions
2.1 General safety instructions
❚INTORQ components ...
- ... must only be used as directed.
- ... must not becommissioned if they arenoticeably damaged.
- ... must not be technically modified.
- ... must not becommissioned if they are incompletely mounted or connected.
- ... must not be operated without the required covers.
- ... can hold live as well as moving or rotary parts during operation according to their degree of pro-
tection. Surfaces may be hot.
❚For INTORQ components ...
- ... the documentation must always be kept at the installation site.
- ... only permitted accessories are allowed to be used.
- ... only original spare parts of the manufacturer are allowed to be used.
❚Follow all specifications and information found in the corresponding enclosed documentation.
These must be followed to maintain safe, trouble-free operations and to achieve the specified product
characteristics.
❚Only qualified, skilled personnel are permitted to work on and with INTORQ components.
According to IEC 60364 or CENELEC HD 384, qualified, skilled personnel are persons ...
- ... who are familiar with the installation, mounting, commissioning, and operation of the product.
- ... who have the qualifications necessary for their occupation.
- ... who know and apply all regulations for the prevention of accidents, directives, and laws relevant
on site.
❚Risk of burns!
- Surfaces may be hot during operation! Provide for protection against accidental contact.
❚Risk of injury due to a rotating shaft!
- Wait until the motor is at standstill before you start working on the motor.
❚The friction lining and the friction surfaces must never contact oil or grease since even small amounts
reduce the braking torque considerably.
❚The brake is designedfor operation under the environmental conditions that apply to IP66 protection.
Because of the numerous possibilities of using thebrake, it is however necessary to checkthe function-
ality of all mechanical components under the corresponding operating conditions.

Safety instructions
INTORQ | BA 14.0199 | 08/2016 11
2.2 Application as directed
❚INTORQ components ...
- ... are intended for use in machinery and systems.
- ... must only be used for the purposes ordered and confirmed.
- ... must only be operated under the ambient conditions prescribed in these Operating Instructions.
- ... must not be operated beyond their corresponding power limits.
Any other use or excessive usage shall be deemed improper!
Possible applications of the INTORQ spring-applied brake
❚No explosive or aggressive atmosphere.
❚Humidity: no restrictions
❚Ambient temperature:
- Standard design: -20 °C to +50 °C
- Optional CCV design: -40 °C to +50°C

Technical specifications
INTORQ | BA 14.0199 | 08/2016 12
3 Technical specifications
3.1 Product description
3.1.1 Structure and function
Abb.1 Design of a BFK470 spring-applied brake
The spring-applied brake is designed for converting mechanical work and kinetic energy into heat energy.
Duetothestaticbrakingtorque,loadscanbeheldatstandstill.Emergencybrakingispossibleathighspeed
of rotation. The wear increases as the switching energy increases.
1.1 Stator 3 Complete rotor 10 Socket head cap screw, DIN EN ISO 4762
1.2 Pressure springs 4 Hub 12 Complete manual release (optional)
1.3 Plug (check for air gap) 6 Flange (optional) 30 Setting screwforthefactory-setadjustment
of the spring force (sealed), applies only to
sizes 12-18
2 Armature plate 8 Coil X Bore holes are optional

Technical specifications
INTORQ | BA 14.0199 | 08/2016 13
The spring-applied brakes BFK470 are electrically releasable single-disc brakes with two friction surfaces.
Whende-energized,bothoftherotor’sfrictionsurfacesaretightenedbytheforceofthecompressionsprings
betweenthearmatureplateandtheflange.Thebrakingtorqueisappliedoverthe frictionradiusoftherotor;
it is transferred to the shaft via a hub that has axial gear teeth. When the brakes are applied, an air gap "sL"
ispresentbetweenthestatorandthearmatureplate.Toreleasethebrake,thestator´scoilisenergizedwith
DCvoltage. The resulting magnetic fluxworks against the spring force to drawthe armature plate to the sta-
tor. This releases the rotor from the spring force and allows it to rotatefreely.
3.1.2 Brakes
During the braking procedure, the pressure springs (1.2) use the armature plate (2) to press the rotor (3)
(which can be shifted axially on the hub (4)) against the friction surface. The asbestos-free friction linings
ensurehighbrakingtorqueandlowwear.Thebrakingtorqueistransmittedbetweenthehub(4)andtherotor
(3) via gear teeth.
3.1.3 Brake release
When the brakes are applied, an air gap "sL" is present between the stator (1.1) and the armature plate (2).
Toreleasethebrake,thecoilofthestator(1.1)isenergizedwiththeDCvoltageprovided.Theresultingmag-
netic flux works against the spring force to draw the armature plate (2) to the stator (1.1). This releases the
rotor (3) from the spring force and allows it to rotate freely
3.1.4 Project planning notes
❚Thebrakesaredimensionedinsuchawaythatthegivenrated torquesarereachedsafelyaftera short
run-in process.
❚However, as the organic friction linings used do not all have identical properties and because environ-
mental conditions can vary, deviations from the specified braking torques are possible. These must be
taken into account in the form of appropriate dimensioning tolerances. Increased breakaway torque is
common in particular after long downtimes in humid environments where temperatures vary.
❚Ifthebrakeisusedasa pure holdingbrakewithoutdynamicload,thefrictionlining must be reactivated
regularly.
NOTICE
Due to the structural design of the stator, the air gap cannot be installed downstream. If the
wear limit is reached,the rotor must be replaced.

Technical specifications
INTORQ | BA 14.0199 | 08/2016 14
3.2 Rated data
1) Maximum speed of rotation when installed horizontally (for higher speeds, contact the manufac-
turer)
Type Max. speed
of rotation 1)
Temperature
class
Operating
time
Moment of
inertia
Mass of brake
nmax
[rpm] Stator [%] Rotor
[kgcm2]
without
flange
[kg]
with
flange
[kg]
without flange
+ Manual
release
[kg]
with flange
+ Manual
release
[kg]
BFK470-06 6000 F (155°C) 100 0.15 1.3 1.5 1.4 1.6
BFK470-08 5000 F (155°C) 100 0.61 2.0 2.2 2.1 2.3
BFK470-10 4000 F (155°C) 100 2.0 3.5 3.9 3.7 4.0
BFK470-12 3600 F (155°C) 100 4.5 5.0 5.6 5.3 5.8
BFK470-14 3600 F (155°C) 100 6.3 7.7 8.5 8.1 8.9
BFK470-16 3600 F (155°C) 100 15.0 11.9 13.1 12.5 13.7
BFK470-18 3600 F (155°C) 100 29.0 17.6 19.1 18.6 20.0
Tab. 1: General brake characteristics
Type Air gap Rotor thickness
sLN sL max min. New state
[mm]
operating brake
[mm]
holding brake
[mm]
operating brake
[mm]
holding brake
[mm] [mm]
BFK470-06 0.2 +0.08
-0.05 0.5 0.3 5.73 5.93 6.0 -0.05
BFK470-08 0.2 +0.08
-0.05 0.5 0.3 6.73 6.93 7.0 -0.05
BFK470-10 0.2 +0.13
-0.05 0.5 0.35 8.73 8.88 9.0 -0.1
BFK470-12 0.3 +0.08
-0.10 0.6 0.45 9.68 9.83 10.0 -0.1
BFK470-14 0.3 ± 0.1 0.75 0.45 9.55 9.85 10.0 -0.1
BFK470-16 0.3 +0.15
-0.05 0.80 0.50 11.05 11.35 11.5 -0.1
BFK470-18 0.4 +0.20
-0.10 1.0 0.65 12.50 12.85 13.0 -0.1
Tab. 2: Air gap / rotor thickness

Technical specifications
INTORQ | BA 14.0199 | 08/2016 15
Type Outer
diameter
Pitch
circle
Fixing screws
DIN EN ISO 4762
Minimum thread depth Tightening
torque
[mm]

[mm] Thread without flange [mm]
with flange
[mm]
without flange
[mm]
with flange
[mm] Ma[Nm]
BFK470-06 89 72 M4 3 x M4x40 3 x M4x45 7.5 9.0 3.0
BFK470-08 106 90 M5 3 x M5x45 3 x M5x50 10.5 10.0 5.9
BFK470-10 130 112 M6 3 x M6x55 3 x M6x60 14.0 13.5 10.1
BFK470-12 148 132 M6 3 x M6x60 3 x M6x65 12.5 12.5 10.1
BFK470-14 168 145 M8 3 x M8x75 3 x M8x80 19.5 18.5 24.6
BFK470-16 200 170 M8 3 x M8x80 3 x M8x85 18.0 17.0 24.6
BFK470-18 226 196 M8 6 x M8x90 6 x M10x100 19.5 23.0 24.6
Tab. 3: Installation data
CAUTION
❚The minimum thread depth of the end shield must be maintained! Tab. 3.
❚Iftherequiredthreaddepthisnotmaintained,thefixingscrewsmayrunontotheroot.This
has the effect that the required pre-load force is no longer established – the brake is no
longer securely fastened!
❚The material of the end shield must have a tensile strength of Rm>= 250 N/mm2.

Technical specifications
INTORQ | BA 14.0199 | 08/2016 16
3.3 Rated data (dimensioning data) electrical data
Type Voltage
U [V DC]
Rated current
IN[A]
Power
PN[W]
Coil resistance
RN± 4% []
BFK470-06
205
0.098 20 2101.0
BFK470-08 0.122 25 1681.0
BFK470-10 0.161 33 1273.0
BFK470-12 0.195 40 1051.0
BFK470-14 0.307 60 667.1
BFK470-16 0.332 68 618.0
BFK470-18 0.415 85 494.4
Tab. 4: Coil data at 20°C
Type Braking torques at relative speed of rotation n
Rated torque
[Nm]
100 rpm
Braking torque
X [%] of the rated torque
Maximum speed
1500
rpm
3000
rpm
maximum horizontal mounting position
rpm
BFK470-06 2.0 / 2.5 / 3.0 / 3.5 / 4.0 /
4.5 / 5.5 /6.0 / 6.5 /
7.0 / 7.5 87 80 74 6000
BFK470-08 3.5 / 5 / 6/ 7 / 8 / 10 /
11 / 12 / 14 / 15 85 78
73
5000
BFK470-10 9 / 11 / 14 / 16 / 18 / 21 /
23 / 25 / 28 / 30 / 33 /36 83 76 4000
BFK470-12 12 / 14 / 15 / 16 /18 /
23 / 27 / 32 / 36 / 40 /
45 / 46 / 48 / 50 / 55 81 74
3600
BFK470-14 40 / 50 / 60 / 65 /70 /
75 / 80 / 100 / 110 80 73 72
BFK470-16 55 / 80 / 90 / 100 /
105 / 125 / 150 79 72 70
BFK470-18 100 / 150 / 165 / 185 /
200 / 235 / 250 77 70 68
Tab. 5: Rated torques

Technical specifications
INTORQ | BA 14.0199 | 08/2016 17
Switching times
Abb. 2 Operating/switching times of the spring-applied brakes
1) Typical values
2) Measured with induced voltage limitation of -800 V DC
t1Engagement time t11 Reaction delay of engagement
t2Disengagement time (up to M = 0.1 Mdyn)t
12 Rise time of the braking torque
Mdyn Rated torque U Voltage
Type Rated torque Max. perm.
switching energy
Transitional
operating frequency
Operating times [ms] 1)
at sLN and 0.7 IN
MKQEShue DC engagement2) Disengagement
[Nm] [J] [h-1]t11 t12 t1t2
BFK470-06 4 3000 79 16 25 41 32
BFK470-08 8 7500 50 30 26 56 52
BFK470-10 16 12000 40 40 64 104 107
BFK470-12 32 24000 30 47 34 81 121
BFK470-14 60 30000 28 30 47 76 162
BFK470-16 80 36000 27 46 62 109 255
BFK470-18 150 60000 20 62 92 155 343
Tab. 6: Switching energy - operating frequency - operating times

Technical specifications
INTORQ | BA 14.0199 | 08/2016 18
Engagement time
The transition from brake-torque free state to holding braking torque is not free of time lags.
❚The engagement times are valid for DC switching with a spark suppressor.
- Spark suppressors areavailable for the rated voltages.
- Connectthesparksuppressorsinparalleltothecontact.Ifthisswitchingisnotadmissibleforsafety
reasons (e.g. with hoists and lifts), the spark suppressor can also be connected in parallel tothe
brake coil.
- Circuit proposals: 25
❚The engagement times are approx. 10 times longer with AC switching.
- Connection: 25
Disengagement time
The disengagement time is the same for DC and AC switching.The disengagement time can be shortened
by special equipment for fast-response excitation or over-excitation.
3.4 Switching energy / operating frequency
Abb. 3 Switching energy as a function of the operating frequency
AA
Switching energy
B
Operating frequency

Technical specifications
INTORQ | BA 14.0199 | 08/2016 19
The permissible operating frequency Shmax depends on the amount of heat QR(refer to Figure 3). At a pre-
set operating frequency Sh, the permissible amount of heat is Qsmax.
With high speeds of rotation and switching energy, the wear increases strongly, because very high temper-
atures occur at the friction surfaces for a short time.
3.5 Emissions
Electromagnetic compatibility
IfanINTORQrectifierisusedfortheDCswitchingofthespring-appliedbrakeandiftheswitchingfrequency
exceeds five switching operations per minute, the useof a mains filter isrequired.
If the spring-applied brake uses a rectifier of another manufacturer for the switching,it may become neces-
sary to connect a spark suppressor in parallel with the AC voltage. Spark suppressors are available on re-
quest, depending on the coil voltage.
Heat
Since the brake converts kinetic energy as well as mechanical and electrical energy into heat, the surface
temperature varies considerably, depending on the operating conditions and possible heat dissipation. Un-
der unfavourable conditions, the surface temperature can reach 130 °C.
Noise
Theswitchingnoiseduringengagementanddisengagementvariesdependingontheairgap,brakingtorque
and brake size.
Dependingon thenaturaloscillationafterinstallation,operatingconditionsandstateofthe frictionsurfaces,
the brake may squeak during braking.
Others
The abrasion of the friction parts produces dust.
NOTICE
The user must ensure compliance with EMC Directive 2004/108/EC using appropriate controls
and switching devices.
Shmax Shue
–
ln 1 QR
QE
---------
–



--------------------------------=
Qsmax QE1e
Shue –
Sh
-------------------
–






=

Mechanical installation
INTORQ | BA 14.0199 | 08/2016 20
4 Mechanical installation
4.1 Important notes
4.1.1 Design of end shield and motor shaft
❚Comply with the mentioned minimum requirements regarding the end shield and the motor shaft to en-
sure a correct function of the brake.
❚The diameter of the shaft shoulder must not be greater than the tooth root diameter of the hub.
❚The form and position tolerances apply only to the materials mentioned. Contact INTORQ if you are us-
ing other materials.
❚The brake flange must be supported by the end shield across the full surface.
Design of the end shield
Type Minimum requirements: Use as counter friction surface
Material Evenness Axial runout Roughness Miscellaneous
[mm] [mm] without flange with flange
BFK470-06
S235JR;C15;
EN-GJL-250
0.03
0.05 Rz 10 Rz 16
❚Threaded
holes with
minimum
thread depth
15
❚Freeofgrease
and oil
BFK470-08
BFK470-10
BFK470-12 0.05
BFK470-14
BFK470-16 0.08
BFK470-18 0.10 0.08
Tab. 7: End shield ascounter friction surface