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ISO 7051 dimensionsCross-recessed raised countersunk head tapping screws

2011 edition, current · 9 sizes, ST2.2 – ST9.5 see the cross-reference →

We supply to ISO 7051. Name it on your order.

90°Recess NumberLkdkdPy

ISO 7051 dimensions

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Thread sizePThread Pitch (mm)aThread Runout (max) (mm)dkTheoretical Head Diameter (max) (mm)dkHead Diameter (mm)dkHead Diameter (min) (mm)kNominal Head Height (mm)rRadius (max) (mm)Recess NumbermType H Recess Width (ref.) (mm)tType H Penetration (max) (mm)tType H Penetration (min) (mm)m/AType Z / Socket Width (ref.) (mm)tType Z Penetration (max) (mm)tType Z Penetration (min) (mm)yPoint Length — C (ref.) (mm)yPoint Length — F (ref.) (mm)yPoint Length — R (ref.) (mm)fRaised Head Height (ref.) (mm)rfHead Radius (ref.) (mm)
ST2.20.81.64.43.83.51.10.801.91.20.921.20.9521.6-0.54
ST2.91.12.26.35.55.21.71.213.22.11.732.011.762.62.1-0.76
ST3.51.32.68.27.36.92.351.424.42.41.94.12.21.753.22.52.70.88.5
ST4.21.42.89.48.482.61.624.62.62.14.42.512.063.72.83.219.5
ST4.81.63.210.49.38.92.8225.23.22.74.93.052.64.33.23.61.29.5
ST5.51.83.611.510.39.932.236.63.32.86.33.182.7353.64.31.311
ST6.31.83.612.611.310.93.152.436.83.536.63.45363.651.412
ST82.14.217.315.815.44.653.248.94.648.84.64.157.54.26.3216.5
ST9.52.14.22018.317.85.2544105.75.19.85.645.1984.2-2.319.5

9 of 9 sizes shown.

Equivalents and mating parts

ISO 1478 →ISO 2702 →GB/T 847 →

Quote against ISO 7051

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