Home › Bolt Torque Chart

Bolt Torque Chart

Torque specs for every metric and imperial bolt size by grade — 4.6, 8.8, 10.9, 12.9 and SAE Grade 2, 5, 8 — dry and lubricated, with clamp loads.

Metric values in N·m, imperial in lb-ft. All figures target 75% of proof load with a nut factor of K = 0.20 (dry) or 0.15 (lubricated). Friction, not the bolt, controls this relationship — see any individual size page for the correction table.

Metric coarse

Bolt	8.8 dry	10.9 dry	12.9 dry	8.8 lubed
M1.6×0.35	0.177	0.253	0.296	0.133
M2×0.4	0.361	0.516	0.603	0.271
M2.5×0.45	0.738	1.06	1.23	0.553
M3×0.5	1.31	1.88	2.2	0.985
M3.5×0.6	2.06	2.95	3.45	1.55
M4×0.7	3.06	4.37	5.11	2.29
M5×0.8	6.17	8.83	10.3	4.63
M6×1	10.5	15	17.6	7.88
M7×1	17.6	25.2	29.4	13.2
M8×1.25	25.5	36.5	42.6	19.1
M10×1.5	50.5	72.2	84.4	37.8
M12×1.75	88	126	147	66
M14×2	141	201	235	105
M16×2	218	312	365	164
M18×2.5	301	431	504	226
M20×2.5	426	610	712	319
M22×2.5	581	831	971	436
M24×3	736	1053	1231	552
M27×3	1079	1544	1805	809
M30×3.5	1463	2094	2447	1097
M33×3.5	1991	2849	3330	1493
M36×4	2558	3661	4278	1918
M39×4	3311	4738	5537	2483
M42×4.5	4096	5861	6850	3072
M45×4.5	5113	7317	8551	3835
M48×5	6152	8804	10288	4614
M52×5	7952	11380	13300	5964
M56×5.5	9890	14153	16541	7418
M60×5.5	12330	17644	20620	9247
M64×6	14900	21322	24919	11175

Metric fine

Bolt	8.8 dry	10.9 dry	12.9 dry	8.8 lubed
M3×0.35	1.46	2.09	2.45	1.1
M4×0.5	3.41	4.88	5.7	2.56
M5×0.5	7.01	10	11.7	5.26
M6×0.75	11.5	16.5	19.2	8.63
M8×1	27.3	39	45.6	20.4
M8×0.75	29.1	41.6	48.7	21.8
M10×1.25	53.2	76.2	89	39.9
M10×1	56.1	80.3	93.8	42.1
M12×1.5	92	132	154	69
M12×1.25	96.1	138	161	72.1
M14×1.5	152	217	254	114
M16×1.5	233	333	389	175
M18×1.5	339	485	566	254
M20×1.5	472	676	790	354
M22×1.5	637	912	1066	478
M24×2	803	1149	1342	602
M27×2	1164	1666	1948	873
M30×2	1621	2320	2712	1216
M33×2	2184	3126	3653	1638
M36×3	2709	3877	4531	2032
M39×3	3489	4993	5836	2617
M42×3	4407	6306	7370	3305
M45×3	5472	7831	9151	4104
M48×3	6696	9583	11199	5022
M52×3	8596	12301	14376	6447
M56×4	10445	14948	17469	7834
M60×4	12971	18562	21692	9728
M64×4	15873	22715	26547	11905

Unified coarse (UNC)

Bolt	Gr 5 dry	Gr 8 dry	Gr 2 dry	Gr 5 lubed
#1-64 UNC	0.203	0.287	0.132	0.152
#2-56 UNC	0.338	0.477	0.218	0.253
#3-48 UNC	0.512	0.722	0.331	0.384
#4-40 UNC	0.718	1.01	0.465	0.538
#5-40 UNC	1.06	1.49	0.684	0.792
#6-32 UNC	1.33	1.88	0.862	0.999
#8-32 UNC	2.44	3.45	1.58	1.83
#10-24 UNC	3.54	5	2.29	2.65
#12-24 UNC	5.55	7.83	3.59	4.16
1/4-20 UNC	8.45	11.9	5.47	6.34
5/16-18 UNC	17.4	24.6	11.3	13.1
3/8-16 UNC	30.9	43.6	20	23.2
7/16-14 UNC	49.4	69.8	32	37.1
1/2-13 UNC	75.4	106	48.8	56.5
9/16-12 UNC	109	154	70.4	81.6
5/8-11 UNC	150	212	97.1	113
3/4-10 UNC	267	376	172	200
7/8-9 UNC	429	606	167	322
1-8 UNC	644	909	250	483
1-1/8-7 UNC	794	1288	354	596
1-1/4-7 UNC	1121	1817	500	840
1-3/8-6 UNC	1469	2382	655	1102
1-1/2-6 UNC	1950	3162	869	1462

Unified fine (UNF)

Bolt	Gr 5 dry	Gr 8 dry	Gr 2 dry	Gr 5 lubed
#0-80 UNF	0.115	0.162	0.074	0.086
#1-72 UNF	0.215	0.304	0.139	0.162
#2-64 UNF	0.359	0.507	0.233	0.27
#3-56 UNF	0.55	0.777	0.356	0.413
#4-48 UNF	0.786	1.11	0.509	0.59
#5-44 UNF	1.1	1.56	0.714	0.828
#6-40 UNF	1.49	2.1	0.962	1.12
#8-36 UNF	2.57	3.62	1.66	1.92
#10-32 UNF	4.04	5.7	2.61	3.03
#12-28 UNF	5.92	8.36	3.83	4.44
1/4-28 UNF	9.66	13.6	6.25	7.25
5/16-24 UNF	19.3	27.2	12.5	14.5
3/8-24 UNF	35	49.4	22.6	26.2
7/16-20 UNF	55.2	77.9	35.7	41.4
1/2-20 UNF	85	120	55	63.7
9/16-18 UNF	121	171	78.5	91
5/8-18 UNF	170	240	110	127
3/4-16 UNF	297	420	192	223
7/8-14 UNF	474	669	184	355
1-12 UNF	704	995	274	528
1-1/8-12 UNF	890	1444	397	668
1-1/4-12 UNF	1241	2012	553	930
1-1/2-12 UNF	2194	3557	978	1645