Wheel Bolts
| Standard | DIN 74361 · ISO 898-1 |
|---|---|
| Material | 40Cr / SCM435 |
| Strength Grade | 10.9 / 12.9 |
| Size Range | M12-M24 |
| Surface Treatment | Zinc Flake |
01
Product Description
Product Description & Key Specifications
Wheel bolts fasten the road wheel directly to the hub or axle assembly and must maintain clamp load under rotation, braking, cornering load, vibration and repeated service removal. They should not be confused with wheel nuts or wheel studs, because thread direction, seat geometry and head form are specific to the vehicle wheel and hub design.
This range covers 40Cr and SCM435 alloy steel wheel bolts in grades 10.9 and 12.9, commonly supplied from M12 to M24 for passenger vehicles, EVs, light trucks, buses, trailers and commercial vehicles. DIN 74361 and ISO 898-1 may be referenced, while seat type, thread pitch, shank length, head height and wrench size are normally finalized by the OEM drawing.
Zinc flake coating is commonly selected for wheel bolts because it provides corrosion protection with controlled coating thickness and reduced hydrogen embrittlement risk compared with conventional electroplating routes. RFQs should confirm ball seat, conical seat or flat seat geometry, thread pitch, coating color, friction requirement and salt spray test expectations.
| Product type | Automotive wheel bolts / wheel lug bolts |
|---|---|
| Standards | DIN 74361 / ISO 898-1 / OEM drawing |
| Material | 40Cr / SCM435 alloy steel |
| Strength grade | 10.9 / 12.9 |
| Size range | M12-M24 |
| Common models | M12 x 1.5, M14 x 1.5, M16 x 1.5, M18 x 1.5, M20 x 1.5, M22 x 1.5, M24 by drawing |
| Seat geometry | Ball seat, conical seat, spherical seat or flat seat by wheel design |
| Head and drive | Hex head, flange head or OEM wheel bolt head with specified wrench size |
| Surface finish | Zinc flake coating, silver or black topcoat when specified |
| Assembly control | Thread fit, seating face, torque coefficient and tightening torque confirmed by OEM specification |
| Documentation | MTC, heat treatment record, hardness, tensile, coating thickness, salt spray and dimensional report on request |
Dimensions & SpecificationsDIN 74361
Technical Drawing
Dimensional Table
| Parameter | M12 | M14 | M18 | M20 |
|---|---|---|---|---|
| P | 1.5 | 1.5 | 1.5 | 1.5 |
| dc/max | 23 | 26 | 28 | 33 |
| dc/min | 22.5 | 25.5 | 27.5 | 32.5 |
| h/max | 19 | 21 | 26 | 28 |
| h/min | 18 | 20 | 25 | 27 |
| k/max | 8 | 8 | 8 | 9.5 |
| k/min | 7 | 7 | 7 | 8.5 |
| s/max | 17 | 19 | 24 | 27 |
| s/min | 16.73 | 18.67 | 23.67 | 26.67 |
02
Selection
Selection Advantages by Application
Passenger Car and EV Wheel Hubs
M12 and M14 zinc flake wheel bolts are commonly used for passenger car and EV wheel hub assemblies where corrosion resistance and repeatable wheel service are important.
Automotive and EV fastenersCommercial Vehicle, Bus and Trailer Wheels
M16-M24 grade 10.9 / 12.9 wheel bolts support heavier wheel disc and hub connections when seat geometry, thread pitch and coating requirements are confirmed.
Commercial vehicle fastenersAftermarket Wheel and Service Programs
Drawing-based wheel lug bolts can be supplied for replacement kits where ball seat, conical seat, length, coating color and packaging need consistent control.
Automotive service fasteners03
Assembly
Recommended Matching Products
04
Manufacturing
Manufacturing & Quality Control
Manufacturing CapabilityQuality Control
OEM drawing review for thread pitch, seat geometry, head height and wrench size40Cr / SCM435 material verification and heat number traceability
Cold heading, forging and seat forming for M12-M24 wheel bolt geometrySeat angle or radius, head dimension, shank length and runout inspection
Quench and temper heat treatment for 10.9 / 12.9 strength classesHardness, tensile and proof load checks according to inspection plan
Thread rolling and controlled seating-face finishingThread gauge, pitch, coating allowance and mating hub thread fit checks
Zinc flake coating with optional silver or black topcoatCoating thickness, salt spray support, friction test support and visual inspection
Bulk, carton or aftermarket kit packagingMTC, CoC, dimensional, coating and salt spray reports prepared on request
05
FAQ
Common Questions Before RFQ
What is the difference between wheel bolts, wheel studs and wheel nuts?
Wheel bolts pass through the wheel and thread directly into the hub. Wheel studs are fixed in the hub and use wheel nuts. The correct part depends on the vehicle design.
Can wheel bolts be supplied to DIN 74361?
Yes. DIN 74361 wheel bolts can be supplied when the required dimensions, thread pitch, seat geometry, material grade and coating are confirmed.
Which seat geometry should I choose?
The wheel design controls the seat. Common options include ball seat, conical seat, spherical seat and flat seat. The drawing or sample should define the required geometry.
Why use zinc flake coating for wheel bolts?
Zinc flake coating provides corrosion resistance with controlled coating thickness and is commonly selected for high-strength automotive fasteners such as wheel bolts.
Are grade 12.9 wheel bolts available?
Yes, grade 12.9 can be produced in 40Cr or SCM435 when the OEM drawing, heat treatment route, coating and inspection criteria are approved.
What information is needed for a wheel bolt RFQ?
Send the standard or drawing, thread size and pitch, length, seat type, head form, material, grade, coating, quantity, packaging and certificate requirements.
Need DIN 74361 wheel bolts for automotive or commercial vehicle programs?
Send your drawing, thread size and pitch, seat geometry, material, grade, zinc flake coating requirement, quantity and inspection documents. We can quote wheel bolts for OEM, service and aftermarket supply.
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