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GB/T 15856.5 dimensionsHexagon washer head drilling screws with tapping screw thread

2023 edition, current · 6 sizes, ST2.9 – ST6.3 see the cross-reference →

We supply to GB/T 15856.5. Name it on your order.

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GB/T 15856.5 dimensions

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Thread sizePThread Pitch (mm)aThread Runout (max) (mm)cWasher Height (min) (mm)daUnderhead Diameter (max) (mm)dcFlange Diameter (mm)dcBearing Diameter (min) (mm)eWidth Across Corners (min) (mm)kNominal Head Height (mm)kHead Height (min) (mm)kwWrenching Height (min) (mm)r1Radius r1 (min) (mm)r2Radius r2 (max) (mm)sWidth Across Flats (max) (mm)sWidth Across Flats (min) (mm)tDrilling Capacity (min) (mm)tDrilling Capacity (max) (mm)
ST2.91.11.10.43.56.35.84.282.82.51.30.10.243.820.71.9
ST3.51.31.30.64.18.37.65.963.431.50.10.255.55.320.72.25
ST4.21.41.40.84.98.88.17.594.13.61.80.20.376.781.753
ST4.81.61.60.95.610.59.88.714.33.82.20.20.387.781.754.4
ST5.51.81.816.311108.715.44.82.70.250.487.781.755.25
ST6.31.81.817.313.512.210.955.95.33.10.250.5109.7826

6 of 6 sizes shown.

Quote against GB/T 15856.5

Standard, size, material, finish, quantity and destination are enough to begin.