Product Description
M8 × 1.25mm property class 8.8 zinc-plated steel hexagon-head set screws, fully threaded and manufactured to the traditional DIN 933 / current ISO 4017 dimensional pattern.
These high-tensile metric set screws feature a conventional external hexagon head and a full metric coarse thread extending along the usable length beneath the head. They are suitable for machinery, automotive components, brackets, agricultural equipment, steel fabrication, maintenance and general engineering assemblies.
- Thread size: M8
- Thread pitch: 1.25mm metric coarse
- Threading: Fully threaded
- Available lengths: 16mm, 20mm, 25mm, 30mm, 40mm, 45mm, 50mm, 60mm, 65mm, 75mm, 90mm, 100mm, 110mm and 120mm
- Head style: External hexagon head
- Width across flats: Approximately 13mm
- Head height: Approximately 5.3mm
- Recommended spanner or socket size: 13mm
- Material: High-tensile steel
- Property class: 8.8
- Finish: Zinc plated
- Traditional standard: DIN 933
- Current international standard: ISO 4017
- British adoption: BS EN ISO 4017
- Pack sizes available: 1, 5, 10, 20, 50, 100, 250, 500 and 1000
These M8 hexagon-head set screws are suitable for machinery, automotive repairs, agricultural equipment, electrical enclosures, brackets, steel fabrication, workshop maintenance and general engineering applications.
The standard M8 × 1.25mm metric coarse thread must be used with a corresponding M8 nut, threaded insert or tapped hole. It is not interchangeable with M6, M10 or M8 metric fine threads such as M8 × 1.0mm.
The fully threaded set-screw construction provides thread engagement along the usable length beneath the head. This makes the screws suitable for assemblies with varying material thicknesses and applications where a plain unthreaded shank is not required.
Property class 8.8 is a high-tensile steel fastener grade with a nominal tensile strength of approximately 800 N/mm². The second figure indicates a nominal yield-strength ratio of 0.8, giving a nominal yield strength of approximately 640 N/mm².
Correct tightening torque depends on the joint design, lubrication, thread condition, mating material, washer arrangement and required clamp load. Generic torque figures should not be applied without checking the requirements of the specific assembly.
The external hexagon head is installed using a correctly fitting 13mm spanner or socket. Ensure the tool is seated fully across the flats before applying torque to reduce the risk of rounding or damaging the head.
The zinc-plated finish provides improved corrosion resistance compared with untreated self-colour steel and is suitable for many indoor and sheltered outdoor applications. It is not normally recommended for prolonged exposure to marine, coastal or highly corrosive environments.
Hexagon set-screw length is measured from directly beneath the head to the end of the screw. The external hexagon head is not included in the stated length.
| A | B | C | D | E |
| 8mm | 120mm | 13mm | 5.3mm | 1.25 |
| 8mm | 16mm | 13mm | 5.3mm | 1.25 |
| 8mm | 20mm | 13mm | 5.3mm | 1.25 |
| 8mm | 25mm | 13mm | 5.3mm | 1.25 |
| 8mm | 30mm | 13mm | 5.3mm | 1.25 |
| 8mm | 40mm | 13mm | 5.3mm | 1.25 |
| 8mm | 50mm | 13mm | 5.3mm | 1.25 |
| 8mm | 65mm | 13mm | 5.3mm | 1.25 |
| 8mm | 75mm | 13mm | 5.3mm | 1.25 |
| 8mm | 90mm | 13mm | 5.3mm | 1.25 |
| 8mm | 60mm | 13mm | 5.3mm | 1.25 |
Please Note: Specifications given are intended as a guide only. If critical to your project please check with us first.
