Property Class 8.8 Steel Wheel Lug Studs are supplied to ISO 898-1 property class 8.8. Corrosion behaviour is requires plating (zinc) for corrosion protection, the material is magnetic, and the usable service range is commonly limited to approx. +300 °C; confirm against the coating and the load. In practice this grade is the workhorse medium-carbon alloy class for structural joints.
- Grade
- ISO 898-1 property class 8.8
- Corrosion resistance
- Requires plating (zinc) for corrosion protection
- Magnetic response
- Magnetic
- Service temperature
- commonly limited to approx. +300 °C; confirm against the coating and the load
Property values are typical for the grade. Certified mechanical test data is available on request for production orders.
Property Class 8.8 Steel Wheel Lug Studs are supplied to our own published dimensions — this is a trade-series article rather than one covered by a dimensional standard, so confirm the figures against the part you are replacing. The grade provides requires plating (zinc) for corrosion protection and is magnetic; the practical service range is commonly limited to approx. +300 °C; confirm against the coating and the load.
Why Choose Property Class 8.8 Steel for Wheel Lug Studs
The workhorse medium-carbon alloy class for structural joints. For wheel lug studs, this matters when requires plating (zinc) for corrosion protection is the primary requirement.
Mechanical & Physical Properties
| Grade designation | ISO 898-1 property class 8.8 |
|---|
| Magnetic response | Magnetic |
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| Service temperature | commonly limited to approx. +300 °C; confirm against the coating and the load |
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| Corrosion characteristic | Requires plating (zinc) for corrosion protection |
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Galvanic & Galling Considerations
For wheel lug studs in steel, the dominant compatibility issue is hydrogen embrittlement at high property classes (10.9 and above) when electroplated. Plating must be followed by an appropriate baking treatment, or a non-electroplated finish (mechanical zinc, zinc flake) should be substituted.
Comparable Grades
For Wheel Lug Studs, class 10.9 or 12.9 is the comparable strength step. Move up when the joint preload approaches the proof load of the current class; move down when the joint is over-specified. For corrosion-critical service, switch to stainless A2 or A4.
Sizes of Wheel Lug Studs Available in Property Class 8.8 Steel
| Thread size | Pitch (mm) | Under-head length (mm) | Knurl diameter (mm) | Head diameter (mm) | Shoulder diameter (mm) | Thread length (in) | Grade / form |
|---|
| M12-1.50 | 1.5 | 48.01 | 12.34 | 17.91 | 11.92 | 1.37 | Grade 10.9 steel, serrated; right-hand |
Dimensions are independent of the material: every size above is available in Property Class 8.8 Steel.
Custom manufacturing · Made to drawing
Need this bolt in a grade that is not listed?
Grade 8 8 Steel is one of the grades the catalog describes. A non-standard bolt is quoted from the drawing; where one already exists in the catalog, the special is usually a variation on its tooling. Made by cold heading or hot forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
Custom bolt manufacturingSend a drawing
Applications & Industries
The sectors that buy Wheel Lug Studs, and the duty each one buys them for.
Industries that specify Wheel Lug Studs
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Wheel repair
Knurl diameter and shoulder length control the press fit.
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Passenger vehicles
M12-1.50 right-hand threads suit the documented service example.
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Brake and hub service
Grade 10.9 steel supports the specified wheel joint.
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Automotive hubs
Serrated wheel studs press into a hub and receive a lug nut.
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Plant & machine installation
Anchoring and levelling machines onto bases and frames.
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Steel fabrication
Hanger rods, tie rods and made-to-length threaded assemblies.
Typical applications
- matching knurl diameter and shoulder length
- selecting thread length and head form for the hub
- installing the matching lug nut and wheel seat
- pressing a serrated stud into a wheel hub
- clamping a joint from both ends where a headed bolt will not fit
- suspending services from a soffit on threaded rod
Service conditions to specify against
- Marine and coastal
- Available in A4 (316) stainless for chloride exposure — coastal structures, pool halls, water treatment and deck hardware, where A2 will eventually pit.
- High load
- Supplied in ISO 898-1 property classes, so the joint can be designed to a stated proof load and tightened to a calculated torque rather than by feel.
Where to use something else
- Do not replace a wheel stud by thread size alone; a wrong knurl or shoulder can loosen in the hub.
- Not for a joint that must be tightened from one side only — there is no head to hold.
Full application guide: where Wheel Lug Studs are used, how to specify them, and the cases they are wrong for
