Description
ISO 4762 M3x20-A4/80 Stainless Steel A4 Cap Screw — BOLTON SKU 71926.
About the ISO 4762 M3x20-A4/80 Stainless Steel A4 Cap
The designation iso4762 m3x20-a4/80 m3 20mm stainless describes a hexagon socket head cap screw made to ISO 4762:2004, the international standard equivalent to DIN 912, in A4 stainless steel at property class 80. The thread is M3 with the coarse 0.5 mm pitch and the nominal shank length is 20 mm. ISO 4762 defines a cylindrical head with a hexagon socket drive; at M3 the head measures 5.5 mm across, stands 3.0 mm high and takes a 2.5 mm hexagon key. A4 is a molybdenum-bearing austenitic stainless steel, the grade normally specified where chloride exposure — marine air, salt spray or washdown — would attack a plain A2 fastener. Property class 80 under ISO 3506-1 sets a minimum tensile strength of 800 MPa. The compact head lets the screw be counterbored flush and driven in recesses where a hex-head bolt and socket would not fit.
Key specifications
| Standard | ISO 4762:2004 (DIN 912 equivalent) |
|---|---|
| Thread | M3 x 0.5 (coarse) |
| Nominal length | 20 mm |
| Head type | Hexagon socket cap head |
| Head diameter | 5.5 mm |
| Head height | 3.0 mm |
| Socket size | 2.5 mm hexagon key |
| Material | A4 austenitic stainless steel |
| Property class | 80 per ISO 3506-1 (min. 800 MPa tensile) |
Typical applications
M3 cap screws in A4-80 are used for instrument and enclosure assembly, bracketry, sensor mounts and light structural fixings where corrosion resistance matters more than absolute strength. The 20 mm length suits stacked plate or spacer arrangements and blind tapped holes of moderate depth. Stainless fasteners at this grade are commonly chosen for coastal, marine and outdoor deployed equipment where a plated carbon-steel screw would corrode at the head recess.
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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