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Reference photograph from the supplied product record. Confirm exact dimensions against the drawing.
Critical Rail Fasteners
Hex Bolt.
DIN 931 · 12.9 ,10.9 or 8.8 · M20 × 70
Hex Bolt for subways, light rail, emus and locomotives. Review the product reference, recorded specifications and drawing requirements to identify the configuration needed for your assembly.
Catalogue reference: CF-RT-005
Parameters
Technical parameters.
| Product | Hex Bolt |
|---|---|
| Standard / drawing | DIN 931 |
| Grade / hardness | 12.9 ,10.9 or 8.8 |
| Size / designation | M20 × 70 |
| Surface treatment | Zinc-aluminium coating (FLZ) or custom finish |
| Friction coefficient (µ total) | 0.11–0.18 |
| Application | Subways, light rail, EMUs and locomotives |
| Application record | Recorded since 2012 |
Confirm the final specification against the order drawing. A recorded application year is not a service-life or warranty statement.
- The source's '12..9' typographical error is displayed as 12.9; the other listed grades are unchanged.
Product details
Product description.
Rail vehicle fastening.
The product record identifies use across subways, light rail, EMUs and locomotives. Use the named component and its individual specification to locate the part within your vehicle assembly; a shared application category does not make different fasteners interchangeable.
Design basis
The product record cites DIN 931. Include that standard designation and the relevant drawing revision in your inquiry, and identify any order-specific differences. The standard reference does not replace the need to confirm the listed size, required grade and finish. Requirements not stated in this product record should remain subject to drawing confirmation.
Drawing and part referenceHead, shank & thread
Identify the head form, thread designation, overall or under-head length and any fitted-shank or shoulder details from the drawing. Where the product name specifies a flange, drilled hole, special drive or cone neck, include that feature in the part reference. A similar photograph is not enough to establish the same specification.
Configuration to confirmFinish & assembly conditions
The listed treatment is Zinc-aluminium coating (FLZ) or custom finish. Specify which listed option is required, together with any drawing-defined preparation or inspection requirements. The recorded friction requirement should remain linked to that specification; it is not an installation-torque value. Tightening instructions and acceptance conditions need confirmation for the actual assembly.
Project-specific requirementsSelection guide.
A clear drawing and complete inquiry help distinguish the exact part from another fastener in the same application group.
Part reference
Send the drawing number and revision, or identify the existing component.
Dimensions
Thread, pitch, length and mating dimensions. Mark any special geometry on the drawing.
Grade / hardness
Identify the required listed option and retain its original grade or hardness notation.
Surface requirements
State the required finish and any project-specific friction or inspection requirements.
Order scope
Specify quantity, additional components and your requested delivery date.
Quote catalogue reference CF-RT-005 when contacting us. Related products below are separate catalogue entries, not a pre-approved assembly kit. Please confirm mating parts and final requirements against the assembly drawing.
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