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Torque Table Hexagon Screws with UNC Threads Table

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

Preloads and tightening torque for steel shank screws with UNC/UNF threads and head contact area sizes according to ASME B18.2.1, ASME B18.3 and ASME B18.2.2

friction coefficient µ = 0.14, Utilization of minimum yield = 90%

Typical Torque for Hexagon Head Screws with UNC Thrreads

Dimensions		Preloads Fv (kN) (lbf) for Property Class											Tightening torque Ma (Nm) (ft-lbs) for property class
		Grade 5*			Grade 8*			Type 2*			Type 3*		Grade 5*			Grade 8*		Type 2*			Type 3*
Ø	M	[kN]	[lbf]		[kN]	[lbf]		[kN]	[lbf]		[kN]	[lbf]	[Nm]	[ft-lbs]		[Nm]	[ft-lbs]	[Nm]	[ft-lbs]		[Nm]	[ft-lbs]
1/4	20	10.1	2260		14.2	3194		-	-		-	-	12.1	8.95		17.1	12.6	-	-		-	-
5/16	18	16.7	3764		23.7	5319		-	-		-	-	25.7	18.9		36.3	26.7	-	-		-	-
3/8	16	24.9	5594		35.2	7904		-	-		-	-	44.6	32.9		63	46.4	-	-		-	-
7/16	14	34.2	7684		48.3	10858		-	-		-	-	70.9	52.3		100	73.9	-	-		-	-
1/2	13	45.8	10300		64.7	14554		45.8	10300		45.8	10300	109	80.3		154	114	109	80.3		109	80.3
5/8	11	73.2	16464		103	232065		73.2	16464		73.2	16464	213	157		301	222	213	157		213	157
3/4	10	109	24485		154	34599		109	24485		109	24485	383	283		541	399	383	283		383	283
7/8	9	151	33891		213	47889		151	33891		151	33891	614	453		868	640	614	453		614	453
1	8	198	44499		280	62879		198	44499		198	44499	922	680		1303	961	922	680		922	680
1-1/8	7	219	49326		352	79166		-	-		219	49326	1153	850		1850	1364	-	-		1153	850
1-1/4	7	280	62934		449	101005		-	-		280	62934	1618	1194		2597	1916	-	-		1618	1194
1-3/8	6	333	74796		534	120043		-	-		333	74796	2121	1565		3405	2511	-	-		2121	1565
1-1/2	6	406	91358		652	146624		-	-		406	91358	2806	2070		4504	3322	-	-		1618	2070

* Grade 5 (~8.8) and Grade 9 (~10.9) according to SAE J 429, Type 2 and type 3 (~8.8) according to ASTM A325 

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