VDI 2230 / API 6A Bolt Torque & Preload Table

ISO Metric (VDI) API 6A Studs

Bolt Class

Yld: 640 MPa | Ten: 800 MPa

Nut / Head Geometry

Current Lubrication

Thrd μ_G

Face μ_K

Target Stress Phase & %

Field Scatter Limits (α_A)

Tool Accuracy (±%)

Friction Scatter (±%)

Help

	Thread	Pitch (mm)	Area A_t (mm²)	D_km (mm)	Mean Preload F_M (kN)	α_A	Thread M_G (Nm)	Face M_WD (Nm)	Torsion Relaxation (%)	Total Torque M_A (Nm)
		1.00	20.12	8.30	6.7 ± 0.1	1.13	3	2	20.5%	5
		1.25	36.61	11.00	12.4 ± 0.3	1.14	8	4	19.4%	12
		1.50	57.99	13.50	19.9 ± 0.4	1.14	16	9	18.7%	25
		1.75	84.27	15.60	29.0 ± 0.6	1.14	28	14	18.2%	42
		2.00	115.44	18.20	39.9 ± 0.9	1.14	45	23	17.9%	68
		2.00	156.67	20.80	55.3 ± 1.2	1.14	69	37	16.1%	105
		2.50	192.47	23.50	66.8 ± 1.4	1.14	96	50	17.5%	146
		2.50	244.79	26.00	86.4 ± 1.9	1.14	134	72	16.1%	206
		2.50	303.40	29.00	108.4 ± 2.4	1.14	182	100	15.0%	282
		3.00	352.50	31.00	124.4 ± 2.7	1.14	232	123	16.1%	355
		3.00	459.41	35.50	164.5 ± 3.6	1.14	337	187	14.8%	524
		3.50	560.59	39.50	199.6 ± 4.4	1.14	459	252	15.3%	711
		3.50	693.55	43.00	249.6 ± 5.5	1.14	620	343	14.4%	964
		4.00	816.72	46.80	292.4 ± 6.4	1.14	800	438	14.8%	1237
		4.50	1120.91	55.00	402.9 ± 8.9	1.14	1277	709	14.5%	1986
		5.00	1473.15	63.50	531.1 ± 11.7	1.14	1914	1079	14.2%	2993
		5.50	2030.02	73.50	736.0 ± 16.3	1.14	3063	1731	13.7%	4794
		6.00	2675.97	82.50	974.2 ± 21.7	1.14	4599	2572	13.3%	7171