Description
ISO 4762 Hexagon Socket Head Cap Screw M8 x 30, A4 Stainless Steel — BOLTON SKU 56540.
About the ISO 4762 Hexagon Socket Head Cap
This item is a hexagon socket head cap screw to ISO 4762, in M8 x 30 mm and A4 stainless steel. ISO 4762 defines the cylindrical-head, internally driven cap screw that is dimensionally interchangeable with DIN 912. In M8 the standard fixes a maximum head diameter of 13.0 mm and a maximum head height of 8.0 mm, with a 6 mm hexagon socket, on an ISO metric coarse thread of 1.25 mm pitch. The compact head allows the screw to be recessed into a counterbore so that nothing stands proud of the surface, and the deep socket gives good key engagement for controlled torque application. A4 is the molybdenum-alloyed austenitic grade within ISO 3506, selected over A2 where chlorides are present in the service environment. The property class of the stainless material should be confirmed at enquiry where a specific strength figure is required by the drawing.
Key specifications
| Standard | ISO 4762 (equivalent to DIN 912) |
|---|---|
| Thread size | M8 × 1.25 (ISO metric coarse) |
| Nominal length | 30 mm |
| Head diameter (dk) | 13.0 mm max |
| Head height (k) | 8.0 mm max |
| Hexagon socket | 6 mm |
| Material | A4 austenitic stainless steel |
Typical applications
M8 x 30 cap screws are a mid-range structural size used for bolting brackets, motor and gearbox feet, bearing blocks, frame joints and equipment skids into tapped holes or through-holes with nuts. The 30 mm length suits a moderate combined grip plus full thread engagement in a steel boss. Specifying A4 rather than A2 or plated steel points this variant at marine, coastal, offshore and washdown installations, where a plated screw would corrode first at the head-to-panel interface.
Supplied by BOLTON Technical Equipment Supplies against request for quotation. Add this item to your RFQ basket to request pricing, lead time and documentation requirements (e.g. CoC, datasheets or test reports where applicable).
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