Bolt torque chart

Published tightening torque data for seven ASTM fastener grades, with proof load, clamp load and the torque figure for plain, galvanised and galvanised-and-waxed finishes.

7 GRADES A307 · GR2 · A325 · A354BD · A449 · A490 · A193B7 REFERENCE DATA

ASTM A307

Bolt Size	TPI	Proof Load (lbs)	Clamp Load (lbs)	Tightening Torque (ft lbs)
Bolt Size	TPI	Proof Load (lbs)	Clamp Load (lbs)	Galv+Waxed	Galv	Plain
¹⁄₄	20	1,053	790	2	4	3
⁵⁄₁₆	18	1,735	1,302	3	8	7
³⁄₈	16	2,567	1,925	6	15	12
⁷⁄₁₆	14	3,521	2,640	10	24	19
¹⁄₂	13	4,700	3,525	15	37	29
⁹⁄₁₆	12	6,028	4,521	21	53	42
⁵⁄₈	11	7,485	5,614	29	73	58
³⁄₄	10	11,062	8,297	52	130	104
⁷⁄₈	9	15,301	11,476	84	209	167
1	8	20,071	15,053	125	314	251
1¹⁄₈	7	25,271	18,953	178	444	355
1¹⁄₄	7	32,093	24,070	251	627	501
1³⁄₈	6	38,254	28,690	329	822	657
1¹⁄₂	6	46,534	34,900	436	1,091	873
1³⁄₄	5	62,928	47,196	688	1,721	1,377
2	4¹⁄₂	82,800	62,100	1,035	2,588	2,070
2¹⁄₄	4¹⁄₂	107,640	80,730	1,514	3,784	3,027
2¹⁄₂	4	132,480	99,360	2,070	5,125	4,140
2³⁄₄	4	163,282	122,461	2,806	7,016	5,613
3	4	197,726	148,295	3,707	9,268	7,415
3¹⁄₄	4	235,152	176,364	4,777	11,941	9,553
3¹⁄₂	4	275,890	206,917	6,035	15,088	12,070
3³⁄₄	4	319,939	239,954	7,499	18,746	14,997
4	4	366,970	275,227	9,174	22,936	18,348

SAE Grade 2

Bolt Size	TPI	Proof Load (lbs)	Clamp Load (lbs)	Tightening Torque (ft lbs)
Bolt Size	TPI	Proof Load (lbs)	Clamp Load (lbs)	Galv+Waxed	Galv	Plain
¹⁄₄	20	1,750	1,313	3	7	5
⁵⁄₁₆	18	2,900	2,175	6	14	11
³⁄₈	16	4,250	3,188	10	25	20
⁷⁄₁₆	14	5,850	4,388	16	40	32
¹⁄₂	13	7,800	5,850	24	61	49
⁹⁄₁₆	12	10,000	7,500	35	88	70
⁵⁄₈	11	12,400	9,300	48	121	97
³⁄₄	10	18,400	13,800	86	216	173
⁷⁄₈	9	15,200	11,400	83	208	166
1	8	20,000	15,000	125	313	250
1¹⁄₈	7	25,200	18,900	177	443	354
1¹⁄₄	7	32,000	24,000	250	625	500
1³⁄₈	6	38,100	28,575	327	819	655
1¹⁄₂	6	46,400	34,800	435	1,088	870

ASTM A325

Bolt Size	TPI	Tension		Tightening Torque Range (ft lbs) (Min – Max)
Bolt Size	TPI	Min	Max	Galv+Waxed	Plain
¹⁄₂	13	12,000	14,000	50 – 58	100 – 117
⁵⁄₈	11	19,000	23,000	99 – 120	198 – 240
³⁄₄	10	28,000	34,000	175 – 213	350 – 425
⁷⁄₈	9	39,000	47,000	284 – 343	569 – 685
1	8	51,000	61,000	425 – 508	850 – 1,017
1¹⁄₈	7	64,000	77,000	600 – 722	1,200 – 1,444
1¹⁄₄	7	81,000	98,000	844 – 1,021	1,687 – 2,042
1³⁄₈	6	97,000	117,000	1,111 – 1,341	2,223 – 2,681
1¹⁄₂	6	118,000	143,000	1,475 – 1,788	2,950 – 3,575

ASTM A449 / SAE Grade 5

Bolt Size	TPI	Proof Load (lbs)	Clamp Load (lbs)	Tightening Torque (ft lbs)
Bolt Size	TPI	Proof Load (lbs)	Clamp Load (lbs)	Galv+Waxed	Galv	Plain
¹⁄₄	20	2,700	2,025	4	11	8
⁵⁄₁₆	18	4,450	3,338	9	22	17
³⁄₈	16	6,600	4,950	15	39	31
⁷⁄₁₆	14	9,050	6,788	25	62	49
¹⁄₂	13	12,050	9,038	38	94	75
⁹⁄₁₆	12	15,450	11,588	54	136	109
⁵⁄₈	11	19,200	14,400	75	188	150
³⁄₄	10	28,400	21,300	133	333	266
⁷⁄₈	9	39,250	29,438	215	537	429
1	8	51,500	38,625	322	805	644
1¹⁄₈	7	56,450	42,338	397	992	794
1¹⁄₄	7	71,700	53,775	560	1,400	1,120
1³⁄₈	6	85,450	64,088	734	1,836	1,469
1¹⁄₂	6	104,000	78,000	975	2,438	1,950
1³⁄₄	5	104,500	78,375	1,143	2,857	2,286
2	4¹⁄₂	137,500	103,125	1,719	4,297	3,438
2¹⁄₄	4¹⁄₂	178,750	134,063	2,514	6,284	5,027
2¹⁄₂	4	220,000	165,000	3,438	8,594	6,875
2³⁄₄	4	271,150	203,363	4,660	11,651	9,321
3	4	328,350	246,263	6,157	15,391	12,313
* SAE J429 grade 5 bolts do not exceed 1-1/2″ diameter.

ASTM A193 B7 / ASTM A320 L7 / ASTM A354 BC

Bolt Size	TPI	Proof Load (lbs)	Clamp Load (lbs)	Tightening Torque (ft lbs)
Bolt Size	TPI	Proof Load (lbs)	Clamp Load (lbs)	Galv+Waxed	Galv	Plain
¹⁄₄	20	3,350	2,513	5	13	10
⁵⁄₁₆	18	5,500	4,125	11	27	21
³⁄₈	16	8,150	6,113	19	48	38
⁷⁄₁₆	14	11,150	8,363	30	76	61
¹⁄₂	13	14,900	11,175	47	116	93
⁹⁄₁₆	12	19,100	14,325	67	168	134
⁵⁄₈	11	23,750	17,813	93	232	186
³⁄₄	10	35,050	26,288	164	411	329
⁷⁄₈	9	48,500	36,375	265	663	530
1	8	63,650	47,738	398	995	796
1¹⁄₈	7	80,100	60,075	563	1,408	1,126
1¹⁄₈	8	82,934	62,201	583	1,458	1,166
1¹⁄₄	7	101,750	76,313	795	1,987	1,590
1¹⁄₄	8	105,006	78,754	820	2,051	1,641
1³⁄₈	6	121,300	90,975	1,042	2,606	2,085
1³⁄₈	8	129,492	97,119	1,113	2,782	2,226
1¹⁄₂	6	147,550	110,663	1,383	3,458	2,767
1¹⁄₂	8	156,687	117,515	1,469	3,672	2,938
1³⁄₄	5	199,500	149,625	2,182	5,455	4,364
1³⁄₄	8	218,400	163,800	–	–	4,778
2	4¹⁄₂	262,500	196,875	3,281	8,203	6,563
2	8	290,850	218,138	–	–	7,271
2¹⁄₄	4¹⁄₂	341,250	255,938	4,799	11,997	9,598
2¹⁄₄	8	373,801	280,351	–	–	10,513
2¹⁄₂	4	420,000	315,000	6,563	16,406	13,125
2¹⁄₂	8	466,200	349,650	–	–	14,569
2³⁄₄	4	468,500	351,263	8,050	20,124	16,100
2³⁄₄	8	515,851	386,888	–	–	17,732
3	4	567,150	425,363	10,634	26,585	21,268
3	8	618,451	463,838	–	–	23,192
3¹⁄₄	4	674,500	505,875	13,701	34,252	27,402
3¹⁄₄	8	730,550	547,913	–	–	29,679
3¹⁄₂	4	791,350	593,513	17,311	43,277	34,622
3¹⁄₂	8	851,201	638,401	–	–	37,240
3³⁄₄	4	917700	688275	21,509	53,771	43,017
3³⁄₄	8	982,300	736,725	–	–	46,045
4	4	1052600	789450	26,315	65,788	52,630
4	8	1,121,950	841,463	–	–	56,098

ASTM A490

Bolt Size	TPI	Tension (lbs)		Tightening Torque Range (ft lbs) (Min – Max)
Bolt Size	TPI	Min	Max	Plain	Lubricated
¹⁄₂	13	15,000	18,000	125 – 150	63 – 75
⁵⁄₈	11	24,000	29,000	250 – 302	125 – 151
³⁄₄	10	35,000	42,000	438 – 525	219 – 263
⁷⁄₈	9	49,000	59,000	715 – 860	357 – 430
1	8	64,000	77,000	1,067 – 1,283	533 – 642
1¹⁄₈	7	80,000	96,000	1,500 – 1,800	750 – 900
1¹⁄₄	7	102,000	122,000	2,125 – 2,542	1,063 – 1,271
1³⁄₈	6	121,000	145,000	2,773 – 3,323	1,386 – 1,661
1¹⁄₂	6	148,000	178,000	3,700 – 4,450	1,850 – 2,225

ASTM A354-BD / SAE Grade 8

Bolt Size	TPI	Proof Load (lbs)	Clamp Load (lbs)	Tightening Torque (ft lbs)
Bolt Size	TPI	Proof Load (lbs)	Clamp Load (lbs)	Plain	Lubricated
¹⁄₄	20	3,800	2,850	12	6
⁵⁄₁₆	18	6,300	4,725	25	12
³⁄₈	16	9,300	6,975	44	22
⁷⁄₁₆	14	12,750	9,563	70	35
¹⁄₂	13	17,050	12,788	107	53
⁹⁄₁₆	12	21,850	16,388	154	77
⁵⁄₈	11	27,100	20,325	212	106
³⁄₄	10	40,100	30,075	376	188
⁷⁄₈	9	55,450	41,588	606	303
1	8	72,700	54,525	909	454
1¹⁄₈	7	91,550	68,663	1,287	644
1¹⁄₄	7	120,000	90,000	1,875	938
1³⁄₈	6	138,600	103,950	2,382	1,191
1¹⁄₂	6	168,600	126,450	3,161	1,581
1³⁄₄	5	228,000	171,000	4,988	2,494
2	4¹⁄₂	300,000	225,000	7,500	3,750
2¹⁄₄	4¹⁄₂	390,000	292,500	10,969	5,484
2¹⁄₂	4	480,000	360,000	15,000	7,500
2³⁄₄	4	517,650	388,238	17,794	8,897
3	4	626,850	470,138	23,507	11,753
3¹⁄₄	4	745,500	559,125	30,286	15,143
3¹⁄₂	4	874,650	655,988	38,266	19,133
3³⁄₄	4	1,014,300	760,725	47,545	23,773
4	4	1,163,400	872,550	58,100	29,085
* SAE J429 grade 8 bolts do not exceed 1-1/2″ diameter.

These are published figures, not your joint.

A table gives you a starting torque. What the tool actually delivers into a real joint is a measurement — send us the fastener and we will tell you how to take it.

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