Bolt Torque Chart

Updated : Aug. 22, 2025

The torque data below is provided for engineering reference only.

In actual assembly, torque-tension can be affected by many factors, such as operator technique, thread surface finish, and lubrication condition.

For the safest and most accurate torque values, perform trial tightening and verification under your actual working conditions. Factors such as thread design, thread engagement length, lubrication condition, and fastener type can significantly affect the final preload. For thread selection considerations, see our Bolt Thread Selection Guide. All final responsibility and risk rest with the user.

titanium bolt

Metric Bolts
A307
Grade 2
A325
A449
Grade 5
A193 B7
A320 L7
A354 BC
A490
A354 BD
Grade 8

Metric bolt torque chart

This chart provides the recommended maximum torque values for threaded products, but it is for reference only. These values are commonly referenced for Titanium Bolts, Titanium Threaded Rods & Studs, and other threaded fastening products used in structural and industrial applications.

Thread Size	Torque for Standard Threads in [N m]
Bolt Grade	3.6	4.6	5.6	6.8	8.8	10.9	12.9
M2	0,1	0,13	0,16	0,26	0,35	0,49	0,59
M2,5	0,2	0,27	0,34	0,54	0,72	1,01	1,21
M3	0,35	0,48	0,60	0,96	1,28	1,80	2,16
M4	0,81	1,12	1,39	2,23	2,97	4,18	5,02
M5	0,6	2,26	2,83	4,52	6,03	8,48	10,18
M6	2,8	3,84	4,80	7,69	10,25	14,41	17,29
M7		5,13	6,42	10,27	13,70	19,25	23,10
M8		9,35	11,69	18,70	24,93	35,06	42,07
M10		18	23	37	49	70	83
M12		32	40	65	86	121	146
M14		52	65	104	138	194	233
M16		81	101	161	215	302	363
M18		112	139	222	296	417	500
M20		157	197	315	420	590	709
M22		215	269	430	574	807	968
M24		272	340	544	726	1020	1224
M27		400	500	800	1067	1500	1800
M30		542	677	1083	1445	2032	2438
M33		739	923	1477	1969	2770	3323
M36		948	1185	1896	2528	3555	4266
M39		1229	1536	2457	3276	4607	5529
M42		1519	1899	3038	4050	5696	6835
M45		1898	2373	3796	5062	7118	8541
M48		2282	2853	4565	6086	8559	10271
M52		2954	3692	5907	7876	11076	13292
M56		3672	4591	7345	9793	13772	16526
M60		4582	5728	9164	12219	17183	20619
M64		5536	6920	11071	14762	20759	24911
M68		6720	8400	13440	17919	25199	30239

Screws made of aluminum, stainless steel, and titanium each have different performance characteristics due to their material properties. Titanium fasteners are available in multiple drive and head configurations, including Titanium Hex Bolts, Titanium Socket Head Screws, Titanium Button Head Screws, Titanium Flat Head Screws, Titanium Torx Screws, and Titanium Set Screws for different installation and load requirements.

Aluminum screws strength grade: 5.6
V2A stainless steel screws: 6.8
Titanium screws: 8.8

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
1 1⁄8	7	25,271	18,953	178	444	355
1 1⁄4	7	32,093	24,070	251	627	501
1 3⁄8	6	38,254	28,690	329	822	657
1 1⁄2	6	46,534	34,900	436	1,091	873
1 3⁄4	5	62,928	47,196	688	1,721	1,377
2	4 1⁄2	82,800	62,100	1,035	2,588	2,070
2 1⁄4	4 1⁄2	107,640	80,730	1,514	3,784	3,027
2 1⁄2	4	132,480	99,360	2,070	5,125	4,140
2 3⁄4	4	163,282	122,461	2,806	7,016	5,613
3	4	197,726	148,295	3,707	9,268	7,415
3 1⁄4	4	235,152	176,364	4,777	11,941	9,553
3 1⁄2	4	275,890	206,917	6,035	15,088	12,070
3 3⁄4	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
5⁄8	11	19,000	23,000	99 - 120	198 - 240

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
1 1⁄8	7	80,100	60,075	563	1,408	1,126
1 1⁄8	8	82,934	62,201	583	1,458	1,166
1 1⁄4	7	101,750	76,313	795	1,987	1,590
1 1⁄4	8	105,006	78,754	820	2,051	1,641
1 3⁄8	6	121,300	90,975	1,042	2,606	2,085
1 3⁄8	8	129,492	97,119	1,113	2,782	2,226
1 1⁄2	6	147,550	110,663	1,383	3,458	2,767
1 1⁄2	8	156,687	117,515	1,469	3,672	2,938
1 3⁄4	5	199,500	149,625	2,182	5,455	4,364
1 3⁄4	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
2 1⁄4	41⁄2	341,250	255,938	4,799	11,997	9,598
2 1⁄4	8	373,801	280,351	-	-	10,513
2 1⁄2	4	420,000	315,000	6,563	16,406	13,125
2 1⁄2	8	466,200	349,650	-	-	14,569
2 3⁄4	4	468,500	351,263	8,050	20,124	16,100
2 3⁄4	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
3 1⁄4	4	674,500	505,875	13,701	34,252	27,402
3 1⁄4	8	730,550	547,913	-	-	29,679
3 1⁄2	4	791,350	593,513	17,311	43,277	34,622
3 1⁄2	8	851,201	638,401	-	-	37,240
3 3⁄4	4	917700	688275	21,509	53,771	43,017
3 3⁄4	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		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
1 1⁄8	7	80,000	96,000	1,500 - 1,800	750 - 900
1 1⁄4	7	102,000	122,000	2,125 - 2,542	1,063 - 1,271
1 3⁄8	6	121,000	145,000	2,773 - 3,323	1,386 - 1,661
1 1⁄2	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
1 1⁄8	7	91,550	68,663	1,287	644
1 1⁄4	7	120,000	90,000	1,875	938
1 3⁄8	6	138,600	103,950	2,382	1,191
1 1⁄2	6	168,600	126,450	3,161	1,581
1 3⁄4	5	228,000	171,000	4,988	2,494
2	4 1⁄2	300,000	225,000	7,500	3,750
2 1⁄4	4 1⁄2	390,000	292,500	10,969	5,484
2 1⁄2	4	480,000	360,000	15,000	7,500
2 3⁄4	4	517,650	388,238	17,794	8,897
3	4	626,850	470,138	23,507	11,753
3 1⁄4	4	745,500	559,125	30,286	15,143
3 1⁄2	4	874,650	655,988	38,266	19,133
3 3⁄4	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.

Terminology explanation

Proof load

This is the "pass" value obtained in a tensile test of a complete bolt (including the threads and head) in a laboratory setting. If the bolt reaches this load without permanent elongation, deformation, or fracture, it is considered qualified.

If a specific bolt standard does not list an official proof load, it can be estimated at approximately 92 % of its minimum yield strength.

Clamp load

To maintain a safety margin, we typically set the target clamp load at 75 % of the proof load. This ensures that, after tightening, the bolt remains well below its limit and is less likely to break.

Note: The 75 % value is a general guideline. Certain designs or engineers may specify a different percentage.

Torque

Torque is the rotational force applied to make an object turn, measured in newton-meters (N·m).

The basic formula: M = F × l

M = torque (N·m)
F = force applied to the wrench (N)
l = lever arm length (m)

Titanium Fasteners Available from Chalco

Chalco supplies a complete range of titanium fastening products for aerospace, marine, chemical processing, medical, and industrial applications. Products are available in commercially pure titanium and titanium alloy grades, with standard and custom specifications supported.

Titanium Threaded Rods

Titanium Rivets

Titanium Threaded Inserts

For different head styles and installation requirements, Chalco can also provide Titanium Hex Bolts, Titanium Socket Head Screws, Titanium Button Head Screws, Titanium Flat Head Screws, Titanium Set Screws, Titanium Torx Screws, Titanium Flange Bolts, Titanium Wood Screws, and Titanium Self-Tapping Screws.

Send your specifications or application requirements to receive recommendations for suitable titanium fasteners.

Why choose us?

As industry experts specializing in fastener solutions, we stand by three core commitments:

Engineering-grade quality – traceable raw materials, 100 % inspection before shipping, with ASTM / ISO / EN certification reports.
Fast delivery – standard stock ships within 3 days, custom specifications in 1–2 weeks.
One-stop technical support – torque calculation, selection advice, and sample testing, all handled directly by our engineers.