Product Description
M8 × 1 Metric Fine Grade 12.9 Self Colour Socket Cap Bolts With Shank
High-strength M8 × 1 socket head cap bolts manufactured from property class 12.9 steel with a self-colour, unplated finish. These bolts combine a metric fine thread, internal hexagon drive and unthreaded shank for demanding machinery, automotive and general engineering assemblies.
- Thread size: M8 × 1
- Thread type: Metric fine
- Property class: 12.9
- Finish: Self colour / unplated
- Head style: Cylindrical socket head
- Drive: Internal hexagon
- Nominal hex key size: 6mm
- Nominal head diameter: Approximately 13mm
- Nominal head height: 8mm
- Construction: Part threaded with an unthreaded shank
- Selectable lengths: 40mm, 45mm, 50mm and 80mm
Check the pitch before ordering: these bolts have an M8 × 1 fine thread. They are not compatible with the standard M8 × 1.25 coarse thread. Use only with a matching M8 × 1 nut or tapped hole.
The current product data does not state the threaded or unthreaded length for these variants. Confirm the required grip and thread-engagement dimensions before ordering.
Property Class 12.9
Property class 12.9 fasteners offer very high tensile strength for highly loaded engineering assemblies. Correct tightening torque and preload depend on the fine thread pitch, lubrication, mating-thread strength, joint design and operating conditions. Use qualified engineering guidance for safety-critical applications.
Metric Fine Thread
The 1mm pitch has more threads per unit length than the standard M8 × 1.25 coarse thread. It is commonly used where an existing assembly specifically requires M8 × 1 or where controlled adjustment is important. Do not substitute another M8 pitch without checking the mating component and joint design.
Self-Colour Finish
Self-colour steel is unplated and provides little inherent resistance to corrosion. Keep these bolts dry and consider protective oil, a suitable coating or a plated alternative where moisture exposure is expected.
Useful Guides and Matching Components
| A | B | C | D | E | F | G | H |
| 8mm | 40mm | * | * | * | * | 1 | * |
| 8mm | 45mm | * | * | * | * | 1 | * |
| 8mm | 50mm | * | * | * | * | 1 | * |
| 8mm | 60mm | * | * | * | * | 1 | * |
| 8mm | 80mm | * | * | * | * | 1 | * |
Please Note: Specifications given are intended as a guide only. If critical to your project please check with us first.
