Related Resources: hardware

Countersunk Screws Torque Table Metric, ISO

ANSI Engineering Hardware | Engineering Fastener Torque Specifications
ISO Metric Hard Engineering Data

Preloads and tightening torque for Metric ISO countersunk head steel screws with hexagon socket head or similar heads.

Typical values for countersunk heads screws with hexagon/hexalobular socket or associated nut, friction coefficient µ = 0.14, Fine thread and course threads apply

Per. DIN 7991 or ISO 10642 property classes 8.8 and 10.9.

Dimensions	Preloads Fv (kN) for property class		Tightening torque MA (Nm) for property class
	8.8	10.9	8.8	10.9
M4	3.10	4.40	2.6	3.4
M5	5.10	7.30	5.6	6.7
M6	7.20	10.30	9.6	11.6
M8	13.20	18.90	23	28.3
M10	21.00	30.10	46	56.0
M12	30.70	43.90	81	96.8
M14	42.00	60.30	125	154.0
M16	58.00	82.70	195	239.0
M18	72.80	100.90	275	332.0
M20	93.60	129.40	390	468.0