Product Description
M12 Metric Fine Grade 8.8 Yellow Zinc Hexagon Head Set Screws
Fully threaded M12 hexagon head set screws manufactured from property class 8.8 high-tensile steel with a yellow zinc-plated finish. Available with either an M12 x 1.5 metric fine thread or an M12 x 1.25 metric extra-fine thread.
These DIN 961-pattern fasteners combine a conventional external hexagon head with a thread extending along the usable shank. Available lengths range from 20mm to 60mm, with pack quantities from 1 to 1,000.
Key Features
- M12 nominal metric thread diameter
- Choice of 1.5mm fine or 1.25mm extra-fine pitch
- Property class 8.8 high-tensile steel
- Yellow zinc-plated finish
- Fully threaded set-screw construction
- External hexagon head
- 19mm nominal spanner size
- Listed as DIN 961 pattern
- Current dimensional reference: BS EN ISO 8676
- Available in packs from 1 to 1,000
Available Thread Pitches and Lengths
| Thread Size | Thread Pitch | Common Description | Available Lengths |
|---|---|---|---|
| M12 | 1.5mm | Metric fine | 20, 25, 30, 35, 40, 45, 50 and 60mm |
| M12 | 1.25mm | Metric extra-fine | 25, 30, 35, 40 and 50mm |
Nominal Head Dimensions
| Thread Diameter | Width Across Flats | Head Height | Length Measurement |
|---|---|---|---|
| 12mm | 19mm | 7.5mm | From beneath the head |
Fastener length is measured from beneath the hexagon head to the end of the threaded section. Head dimensions are nominal and should be confirmed if they are critical to the assembly.
Standards Information
This product is listed as a DIN 961 fully threaded hexagon head screw with a metric fine-pitch thread. The corresponding current British and international dimensional standard is BS EN ISO 8676:2022.
Property class 8.8 mechanical requirements are covered by BS EN ISO 898-1. Standards should not be treated as a certification claim unless conformity is supported by the manufacturer’s documentation or inspection certification.
Yellow Zinc-Plated Finish
The yellow zinc-plated finish provides greater resistance to surface corrosion than untreated steel and gives the fastener its characteristic yellow or gold appearance. Colour and shade can vary between manufacturing batches.
Zinc plating is generally suitable for indoor, automotive and moderately exposed environments. It should not be treated as equivalent to stainless steel or hot-dip galvanising for marine or highly corrosive conditions.
Typical Applications
- Automotive engines, gearboxes and suspension components
- Agricultural and construction machinery
- Hydraulic and mechanical equipment
- Machine building and industrial maintenance
- Flanges, brackets and fabricated steel assemblies
- Applications originally designed for M12 fine threads
- Repair and restoration of vehicles and machinery
Installation Advice
Confirm whether the mating component requires an M12 x 1.5 or M12 x 1.25 thread before installation. Attempting to fit the wrong pitch can damage both the screw and the internal thread.
Use a suitable 19mm spanner or socket. Tightening torque depends on the selected pitch, joint design, nut strength, lubrication, coating and required clamp load. Use the equipment manufacturer’s specified torque rather than a general value where the application is safety-critical.
Terminology
In UK fastener terminology, a hexagon head set screw is a headed fastener that is fully threaded. It should not be confused with a headless socket set screw, which is more commonly called a grub screw.
