FASTENER STANDARD
M8 x 20
Hexagon Socket Countersunk Head Screw — DIN 7991 / ISO 10642 / GB/T 70.3
M8 x 20 is listed in the confirmed supply specifications of the products shown below. Dimensions are referenced against DIN 7991 / ISO 10642 / GB/T 70.3; where these standards differ, both values are shown so the correct one can be confirmed before ordering. Packing quantity, stock status and mechanical property class are confirmed in the quotation. Column symbols: P = thread pitch; dk = head diameter; k = head height.
Edition to confirm · Specification| Standard | Status | P (mm) | socket (mm) | dk (mm) | k (mm) | dkTheoreticalMax (mm) | dkMin (mm) | driveNo (mm) | driveRefH (mm) | socketDepthMax (mm) | socketDepthMin (mm) | rMin (mm) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DIN 7991 | Historical | 1.25 | 5 | 16 | 4.4 | - | - | - | - | - | - | - |
| ISO 10642 | Current | 1.25 | 5 | 17.92 | 4.96 | - | - | - | - | - | - | - |
| GB/T 70.3 | Current | 1.25 | 5 | 17.92 | 4.96 | - | - | - | - | - | - | - |
Compare before substituting
DIN 7991 →ISO 10642GB/T 70.3ISO 14581ISO 14582DIN 7991 / M8 / dk: ISO 10642 17.92 · DIN 7991 16
DIN 7991 / M8 / k: ISO 10642 4.96 · DIN 7991 4.4
