M3 12.9 Self Colour Socket Cap Bolts DIN 912

Product Description

M3 Grade 12.9 Self Colour Socket Cap Bolts With Shank

High-strength M3 metric socket head cap bolts manufactured from property class 12.9 steel with a self-colour finish. These part-threaded fasteners have an unthreaded shank and an internal hexagon drive, making them suitable for machinery, automotive equipment and compact engineering assemblies.

• Thread size: M3
• Standard pitch: 0.5mm metric coarse
• Property class: 12.9
• Finish: Self colour / unplated
• Head style: Cylindrical socket head
• Drive: Internal hexagon
• Nominal hex key size: 2.5mm
• Construction: Part threaded with an unthreaded shank
• Available lengths: 25mm to 60mm
• Dimensional standard: DIN 912 / ISO 4762 pattern

The M3 × 0.5 coarse thread must be used with matching M3 × 0.5 nuts or internally threaded components. It is not interchangeable with M3 fine-pitch or imperial threads.

The 20mm thread and resulting shank lengths are the dimensions currently listed for these products. Confirm them before ordering if thread engagement or grip length is critical.

Grade 12.9 Steel

Property class 12.9 is intended for highly loaded engineering assemblies requiring high tensile strength. Correct preload and tightening torque depend on factors including lubrication, mating-thread strength, joint design and operating conditions. Obtain qualified engineering guidance for safety-critical applications.

Self-Colour Finish

Self-colour steel is unplated and provides little inherent corrosion protection. Store these bolts in dry conditions and consider a suitable oil, coating or alternative plated fastener where moisture or corrosive exposure is expected.

Useful Guides and Matching Components

• Matching metric nuts
• Washers
• Metric and imperial thread guide
• Fastener technical information

Please Note: Specifications given are intended as a guide only. If critical to your project please check with us first.