Home/Standards/GB/T 15856.4

GB/T 15856.4 dimensionsHexagon flange head drilling screws with tapping screw thread

2002 edition, current · 6 sizes, ST2.9 – ST6.3 see the cross-reference →

We supply to GB/T 15856.4. Name it on your order.

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GB/T 15856.4 dimensions

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Thread sizePThread Pitch (mm)aThread Runout (max) (mm)dcFlange Diameter (mm)dcBearing Diameter (min) (mm)cWasher Height (min) (mm)sWidth Across Flats (max) (mm)sWidth Across Flats (min) (mm)eWidth Across Corners (min) (mm)kNominal Head Height (mm)kHead Height (min) (mm)kwWrenching Height (min) (mm)rRadius (max) (mm)tDrilling Capacity (min) (mm)tDrilling Capacity (max) (mm)
ST2.91.11.16.35.80.443.824.282.82.51.30.40.71.9
ST3.51.31.38.37.60.65.55.325.963.431.50.50.72.25
ST4.21.41.48.88.10.876.787.594.13.61.80.61.753
ST4.81.61.610.59.80.987.788.714.33.82.20.71.754.4
ST5.51.81.81110187.788.715.44.82.70.81.755.25
ST6.31.81.813.512.21109.7810.955.95.33.10.926

6 of 6 sizes shown.

Quote against GB/T 15856.4

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