SPIETH MSA Series User manual

Document
ba-msa-en2336
Page 1 of 10
Operating Instructions
MSA
The Operating Instructions are also available for download at www.spieth-me.de. In case of any questions, please
contact Spieth-Maschinenelemente GmbH & Co. KG directly.
Legal:
Spieth-Maschinenelemente GmbH & Co. KG, Alleenstraße 41, D - 73730 Esslingen
Phone [phone] - Fax [phone]
E-Mail: info@Spieth me.de - Web: www.spieth-me.de
KG: Esslingen HQ, Stuttgart county court, company register sect. A 210689
PhG: Spieth-Beteiligungs-GmbH, Esslingen HQ, Stuttgart county court, company register sect. A 210636
Managing director: Dipl.-Ing. Alexander Hund
©Spieth
Proprietary
notice
ISO 16016
Previous document: ba-msa-en1815
See
www.spieth-me.de/english/service-download/catalogue-instructions/
Successive document: N/A
Created: 15 Sep 2023/Fd
For any questions, requests or suggestions, please contact
[email protected]
Checked: 15 Sep 2023/Ax
Original version of the operating instructions
For
Series
Components
Spieth locknuts
(precision locknuts)
MSA
MSA 20x1 MSA 25x1.5 MSA 30x1.5
MSA 35x1.5 MSA 40x1.5 MSA 45x1.5
MSA 50x1.5 MSA 55x1.5 MSA 60x1.5
MSA 65x1.5 MSA 70x1.5 MSA 75x1.5
MSA 80x2 MSA 85x2 MSA 90x2
MSA 95x2 MSA 100x2 MSA 105x2
MSA 110x2 MSA 120x2 MSA 130x3
MSA 140x3 MSA 150x3 MSA 160x3
MSA 170x3 MSA 180x3 MSA 190x3
MSA 200x3

Document
ba-msa-en2336
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Operating Instructions
MSA
©Spieth
Proprietary
notice
ISO 16016
Previous document: ba-msa-en1815
See
www.spieth-me.de/english/service-download/catalogue-instructions/
Successive document: N/A
Created: 15 Sep 2023/Fd
For any questions, requests or suggestions, please contact
[email protected]
Checked: 15 Sep 2023/Ax
About the operating instructions for Spieth Locknuts
These operating instructions enable safe and efficient handling of Spieth locknuts. Prior to performing any tasks,
ensure that your staff have carefully read and fully understood these operating instructions.
Notices
The basic requirement for working safely is compliance with all specified safety notices. They can be identified by
the following symbols:
Caution!
In addition to the notices in these instructions, local accident prevention guidelines and national health and safety
regulations also apply.
Table of Contents
1 Information about Spieth Locknuts ....................................................................................................................3
1.1 General information ...................................................................................................................................3
1.2 Safety notices .............................................................................................................................................3
2 Description of Spieth Locknuts...........................................................................................................................4
2.1 Structure.....................................................................................................................................................4
2.2 Mode of action ...........................................................................................................................................4
2.3 Intended use...............................................................................................................................................5
3 Delivery Contents and Storage of Spieth Locknuts.............................................................................................5
3.1 Delivery contents of the Spieth Locknuts ...................................................................................................5
3.2 Storage and shelf life of the Spieth Locknuts..............................................................................................6
4 Assembling Spieth Locknuts ...............................................................................................................................6
4.1 Preparing for assembly...............................................................................................................................6
4.2 Ambience/Environment .............................................................................................................................7
4.3 Assembly process .......................................................................................................................................7
5 Using Spieth Locknuts.........................................................................................................................................9
6 Disassembling Spieth Locknuts...........................................................................................................................9
7 Disposing of Spieth Locknuts............................................................................................................................10

Document
ba-msa-en2336
Page 3 of 10
Operating Instructions
MSA
©Spieth
Proprietary
notice
ISO 16016
Previous document: ba-msa-en1815
See
www.spieth-me.de/english/service-download/catalogue-instructions/
Successive document: N/A
Created: 15 Sep 2023/Fd
For any questions, requests or suggestions, please contact
[email protected]
Checked: 15 Sep 2023/Ax
1Information about Spieth Locknuts
1.1 General information
Please read these operating instructions carefully, paying special attention to our safety notices. These operating
instructions are part of your product and must be kept accessible to the staff in the immediate vicinity of the
product at all times. The operating instructions are also available for download at www.spieth-me.de.
In case of any questions, please contact Spieth-Maschinenelemente GmbH & Co. KG directly.
Caution!
It is mandatory to comply with the recommendations and notices in these operating instructions.
Inform the end user about the contents of these operating instructions.
Spieth-Maschinenelemente GmbH & Co. KG assumes no liability for damage caused by (i)
misinterpreting or nonobserving the operating instructions; (ii) improper use; (iii) incorrect
installation or unauthorised structural changes; or (iv) incorrectly circulating or failure to circulate
the contents of these operating instructions to third parties.
These operating instructions apply on the assumption that the chosen product is valid for the use case. Please see
the related design guide (available at www.spieth-me.de) for specifications, characteristics, and information on
choosing the right Spieth locknuts.
1.2 Safety notices
Spieth locknuts are intended for use on threaded spindles. Please follow all relevant safety notices.
Caution!
Any work carried out with or on the locknut needs to follow the "safety first" guideline!
During operation, keep your hands away from the working area of the locknut!
Prior to any assembly work, switch off all machine drives!
Secure the machine against accidental power-up!
Prior to commissioning the machine, install all safety devices!
Only expert personnel are allowed to perform assembly work on Spieth locknuts. Using Spieth locknuts is only
admissible according to specifications. Spieth-Maschinenelemente GmbH & Co. KG assumes no liability for
violations of the operating instructions or safety notices. This also applies to incorrectly interpreting or circulating
these notices and to incorrect assembly or maintenance.
The locknuts described here are state of the art at the time these assembly instructions are printed. Subject to
changes based on evolved technologies. For international deliveries, follow the safety regulations applicable in
the target country.

Document
ba-msa-en2336
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Operating Instructions
MSA
©Spieth
Proprietary
notice
ISO 16016
Previous document: ba-msa-en1815
See
www.spieth-me.de/english/service-download/catalogue-instructions/
Successive document: N/A
Created: 15 Sep 2023/Fd
For any questions, requests or suggestions, please contact
[email protected]
Checked: 15 Sep 2023/Ax
2Description of Spieth Locknuts
2.1 Structure
Spieth locknut bodies
Fig. 1: Schematic representation similar to
Spieth MSA series locknuts
Spieth clamping screws
Radial boreholes for pin spanner DIN 1810 - B
Axial boreholes for face spanner
Identifying features (for original Spieth locknuts)
Spieth logo
Name
Batch number
Locking torque MSfor clamping screws
Spieth MSA series locknuts are assemblies consisting of locknut bodies and clamping screws. The thread inside
the locknut body is interrupted by a groove, separating the locknut body into a load and a locking part. A
diaphragm connects load and locking part.
2.2 Mode of action
Spieth locknuts are precision locknuts. Due to their design they
provide a maximum of precision, combined with utmost locking
properties.
Spieth MSA series locknuts have been designed as all-purpose
precision locknuts (e.g., for locking high-quality fastenings, shaft
bearings, or spindle bearings).
Despite their compact design and the high axial loads occurring
here, Spieth-locknuts guarantee permanent pretension and a
rigid and precisely aligned contact with the bearing for an
immaculately supported spindle.
Fig. 2: Illustration similar to Spieth MSA locknuts
Spieth MSA series locknuts are frictionally engaged one-piece locknuts. Load part and locking part of the locknut
body approach each other purely along an axis via the elastic diaphragm. Actuating the tensioning / clamping
screws arranged in axial direction causes load part and locking part to approach each other purely along an axis.
Since the locking part has been designed as a stable ring, a 360° tessellation using several thread turns is used to
achieve a frictionally engaged clamping on the shaft thread. Tessellation converts the bolt force directly into a
contact force evenly distributed across the entire circumference. Owing to system characteristics, this
automatically aligns the end face at a right angle.

Document
ba-msa-en2336
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Operating Instructions
MSA
©Spieth
Proprietary
notice
ISO 16016
Previous document: ba-msa-en1815
See
www.spieth-me.de/english/service-download/catalogue-instructions/
Successive document: N/A
Created: 15 Sep 2023/Fd
For any questions, requests or suggestions, please contact
[email protected]
Checked: 15 Sep 2023/Ax
2.3 Intended use
Spieth locknuts are recognised state of the art. They have been designed to permanently retain pretension and/or
a position on a threaded spindle using frictional locking in the thread. Any other usage is regarded as improper
use.
Spieth-Maschinenelemente GmbH & Co. KG reserves the right to technical changes. In case of any questions or
technical issues, please contact Spieth-Maschinenelemente GmbH & Co. KG.
Caution!
Only expert personnel are allowed to choose, assemble, operate, and service Spieth locknuts.
Use Spieth locknuts only according to product-specific specifications. To ensure proper functioning of the Spieth
locknuts, it is mandatory to comply with the specifications of the connecting components. Detailed information
on the above items can be found in the Design Guide. Operating conditions, e.g. speeds and temperatures at
which the Spieth locknuts are used must not exceed common standards.
Caution!
The user assumes responsibility for proper spindle thread design, for ascertaining the pretension
required for the bearings to be locked, for determining the operating loads and meeting permissible
operating conditions. In case of any questions or technical issues, please contact Spieth-
Maschinenelemente GmbH & Co. KG.
In case operating conditions change, it is mandatory to check if the locknut is still suitable for further use.
Spieth locknuts need to be handled with care, assembled correctly, and used as intended to achieve their full
functional potential. Prior to working with our locknuts, please read these operating instructions carefully. In
particular, please follow all relevant safety notices.
Caution!
It is mandatory to comply with the instructions for use and the general safety notices!
Handle locknuts with care before and during assembly and assemble them according to these
operating instructions. Use only stipulated tools for assembling locknuts.
Incorrect handling or the use of inadequate aids can severely limit, damage, or destroy the machine
element and/or the machine in its functionality.
Spieth locknuts are not meant to be repaired; if repairs are necessary in exceptional cases, only the manufacturer
is allowed to perform them.
3Delivery Contents and Storage of Spieth Locknuts
3.1 Delivery contents of the Spieth Locknuts
Spieth MSA series locknuts have been treated with a preservative. Within the component's packaging bag, a VCI
atmosphere is created providing additional corrosion protection for a certain length of time. Opening the cover or

Document
ba-msa-en2336
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Operating Instructions
MSA
©Spieth
Proprietary
notice
ISO 16016
Previous document: ba-msa-en1815
See
www.spieth-me.de/english/service-download/catalogue-instructions/
Successive document: N/A
Created: 15 Sep 2023/Fd
For any questions, requests or suggestions, please contact
[email protected]
Checked: 15 Sep 2023/Ax
withdrawing the component can reduce the duration of the corrosion protection even if the component is
repackaged.
In case of complaints, please contact Spieth-Maschinenelemente GmbH & Co. KG with your multi-digit picking
number at hand. In case you have to return the component, please package it with care, affix a shipping label, and
send it to Spieth-Maschinenelemente GmbH & Co. KG.
If functional surfaces exhibit thin blank lines, then they have been created during our quality assurance process
when measuring the components. They do not impact the functionality of the components and constitute no
defects.
The clamping screws of Spieth locknuts have been tightened as ready for assembly.
3.2 Storage and shelf life of the Spieth Locknuts
In our experience, the corrosion protection is effective for up to two years, provided you keep the following in
mind during the storage period:
•The storeroom is clean and enclosed
•Packaged parts are protected from mechanical influences
•The storeroom is dry (rel. humidity < 65%)
•The temperature range is 0°C to 40°C
•No corrosive media such as gases, vapors, or liquids can act
4Assembling Spieth Locknuts
4.1 Preparing for assembly
Remove Spieth locknuts from their packaging right before assembly. As hand perspiration can cause corrosion,
ensure to keep your hands dry and clean and/or to always wear protective gloves for assembly.
Please note:
For environmental reasons, please comply with applicable statutory regulations and guidelines when
disposing of packaging materials.
In case of damage to packaging components, check the locknuts for damage and remove any contamination.
The preservative used is compatible with all conventional machine oils. If in doubt, check the preservative's
compatibility.
For an optimum mode of action of Spieth locknuts, remove the thin wax-like film of preservative from the contact
surfaces using a lint-free cloth. Directly afterwards, use machine oil without friction-reducing additives to lightly
oil the component and protect it from corrosion.

Document
ba-msa-en2336
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Operating Instructions
MSA
©Spieth
Proprietary
notice
ISO 16016
Previous document: ba-msa-en1815
See
www.spieth-me.de/english/service-download/catalogue-instructions/
Successive document: N/A
Created: 15 Sep 2023/Fd
For any questions, requests or suggestions, please contact
[email protected]
Checked: 15 Sep 2023/Ax
4.2 Ambience/Environment
During assembly, ensure that...
•the assembly location is clean and free from dust,
•the components have no contact with corrosive media,
•foreign bodies such as sand, sawdust, fluff, etc. are kept away from the component,
•metal filings (in particular from machining tools such as files, etc.) are kept away from the component.
Caution!
Contamination can significantly impact the functionality and service life of Spieth locknuts.
For best results, use a suitable, enclosed space for assembly and proceed swiftly. If this is not possible, make sure
to protect the components from ambient contamination and from damage.
4.3 Assembly process
Essentially, assembly is a 4-step process:
•1. Screwing
•2. Aligning
•3. Tightening
•4. Locking
For an optimum mode of action of Spieth locknuts, perform all four assembly steps in the specified order.
Caution!
To apply the locking force, use only original Spieth clamping screws. Do not actuate the clamping
screws until the nut thread has been fully screwed onto the spindle thread.
Otherwise, damage such as plastic deformation may occur on the locknut and render it unusable.
Use only the following assembly process for assembling Spieth MSA series locknuts:
4.3.1 Screwing:
First clean, lightly oil and then screw the locknut onto the spindle thread but avoid contact with the end face. It is
recommended to lightly oil the spindle thread, too. Since the nut thread is coordinated with the clearance of the
spindle thread, you can easily do this manually. We recommend maintaining sufficient distance to the planar
support while ensuring that the locking part of the nut body is fully screwed onto the spindle thread.

Document
ba-msa-en2336
Page 8 of 10
Operating Instructions
MSA
©Spieth
Proprietary
notice
ISO 16016
Previous document: ba-msa-en1815
See
www.spieth-me.de/english/service-download/catalogue-instructions/
Successive document: N/A
Created: 15 Sep 2023/Fd
For any questions, requests or suggestions, please contact
[email protected]
Checked: 15 Sep 2023/Ax
4.3.2 Aligning:
Tighten the clamping screws stepwise and crosswise. Regularly check how much play the nut has on the thread.
Repeat this process until the movement is nearly free of play. This aligns the end face of the locknut with the
spindle axis. This requires very little torque on the clamping screws (normally far less than 1 Nm); we recommend
using a manual tool (screwdriver or spanner) for sensitive tightening.
4.3.3 Tightening (1):
To reduce subsidence, first use an increased pretensioning torque MVe to tighten the locknut against the planar
support; then undo it. Depending on the load capacity of the connecting components, the increased
pretensioning torque MVe of the locknut may amount up to 1.2 to 1.5 times the calculated pretensioning torque
MV(see design guide/see note).
4.3.4 Tightening (2):
Now tighten the locknut with the calculated pretensioning torque MV(see design guide/see notice) using a
suitable tool (see design guide).
4.3.5 Locking:
Lock locknut by tightening the clamping screws stepwise and crosswise until the specified locking torque MS(see
design guide). For optimum effectiveness we recommend tightening the clamping screws in three steps (50%,
75% and 100% of the specified locking torque MS). Due to the operating principle there may be a slight localised
relief of strain of the contact on the end face but this has been factored into the calculated pretensioning torque
MV. Lock Spieth locknuts only if used with original Spieth clamping screws and if the nut thread is fully screwed
onto the spindle thread.
In case of maximum demands on spindle concentricity you can individually adjust the clamping screws to achieve
the desired result.
Please note:
Intense clamping at the thread flanks during the locking process causes a high level of axial rigidity
on the locknut. In turn, this slightly reduces the pretension. The degree of this end face strain relief
is reproducible and is easily compensated by the calculated pretensioning torque MV (see design
guide).
Following specified assembly, Spieth locknuts are ready for use immediately.
For more information on assembly, please see the relevant assembly instructions, available at www.spieth-me.de.

Document
ba-msa-en2336
Page 9 of 10
Operating Instructions
MSA
©Spieth
Proprietary
notice
ISO 16016
Previous document: ba-msa-en1815
See
www.spieth-me.de/english/service-download/catalogue-instructions/
Successive document: N/A
Created: 15 Sep 2023/Fd
For any questions, requests or suggestions, please contact
[email protected]
Checked: 15 Sep 2023/Ax
5Using Spieth Locknuts
Spieth locknuts are maintenance-free. During general maintenance work, we nevertheless recommend a visual
inspection. If used as intended, Spieth locknuts provide permanently precise pretension and positioning of the
bearing on a threaded spindle.
The self-locking breakaway torque is measured on a torsion test bench. The values determined correspond to the
locking effect of the nut, detached of the influences of the contact geometry and the friction conditions. The
locknut is mounted on a threaded steel spindle of grade 6g in accordance with the securing procedure in the
assembly instructions (oiled thread, tightening the clamping screws crosswise in 3 steps).
The axial runout results from the flatness and the angularity. Both features are monitored on our production
system.
We recommend periodic visual inspections of the locknut parts for potential damage. During regular maintenance
intervals, check in particular locking torque MSof the clamping screws.
Follow general safety notices when using Spieth locknuts.
Caution!
Never touch actively rotating components. Take protective measures against accidental contact.
If you notice irregularities with the Spieth locknuts during operation, immediately switch off the machine's drive.
6Disassembling Spieth Locknuts
If handled correctly, Spieth locknuts can be reused several times. Due to the adjustments made, once a locknut
has been locked onto a spindle thread you can only reuse it on the same thread after they have been
disassembled.
Caution!
Unlock all the clamping screws stepwise and crosswise to avoid overstraining the screws. Otherwise,
the screws may fracture or the locknut or its adjoining components may be damaged.
To disassemble, proceed in reverse assembly order.
•1. Unlock: Unlock by undoing the clamping screws stepwise and crosswise.
•2. Undo: Undo locknut from system using suitable tools.
•3. Unscrew: Unscrew locknut by hand from threaded spindle.
If used as intended the diaphragm will open the interlocked thread flanks during unlocking. This restored joint
play makes it easy to unscrew the locknut manually without damaging the threaded spindle.
Please note:
Following complete disassembly, slightly (manually) tighten the loosened clamping screws until they
are flush. In any case, avoid tightening the clamping screws without a fully covered nut thread.
To enable later reuse, clean, preserve, and store Spieth locknuts correctly. Prior to reuse, proceed as detailed in
section 4.1, "Preparing for assembly" ff.

Document
ba-msa-en2336
Page 10 of 10
Operating Instructions
MSA
©Spieth
Proprietary
notice
ISO 16016
Previous document: ba-msa-en1815
See
www.spieth-me.de/english/service-download/catalogue-instructions/
Successive document: N/A
Created: 15 Sep 2023/Fd
For any questions, requests or suggestions, please contact
[email protected]
Checked: 15 Sep 2023/Ax
If non-original Spieth spare parts are used, Spieth-Maschinenelemente GmbH & Co. KG assumes no liability or
warranty.
7Disposing of Spieth Locknuts
You can easily reorder Spieth locknuts by entering the component designation imprinted on the nut body and the
batch number.
Locknut body and clamping screws of a Spieth locknuts are made of steel. At the end of their operating life, clean
metal parts and dispose of as scrap metal.
Please note:
For environmental reasons, please comply with applicable statutory regulations and guidelines when
disposing of these products.