bolt and Screw Torque Data – Thelen Tree Farm

Bolt Torque - Screw Torque Data

Suggested maxium torque values for different material and grade bolts & screws.

Torque, is the measurement of the turning or twisting force applied to an object. The desired result is to hold two parts together with a tension or clamping force that is greater than any external force that could possibly seperate them. The part then remains under constant stress and is immune to fatigue.

These charts apply to clean and dry parts. A lubricated bolt requires less torque to attain the same clamping force as a non-lubricated bolt.

The values are stated in Inch pounds.

Bolt Size	Thds Per Inch	Low Carbon Steel	18-8 St. St.	Yellow Brass	Silicon Bronze	Aluminum 2024-T4	316 St. St.	Monel
0	80	1.0	---	---	---	---	---	---
1	64	1.5	---	---	---	---	---	---
1	72	2.0	---	---	---	---	---	---
2	56	2.2	2.5	2.0	2.3	1.4	2.6	2.5
2	64	2.7	3.0	2.5	2.8	1.4	3.2	3.1
3	48	3.5	3.9	3.2	3.6	2.1	4.0	4.0
3	56	4.0	4.4	3.6	4.1	2.4	4.6	4.5
4	40	4.7	5.2	4.3	4.8	2.9	5.5	5.3
4	48	5.9	6.6	5.4	6.1	3.6	6.9	6.7
5	40	6.9	7.7	6.3	7.1	4.2	8.1	7.8
5	44	8.5	9.4	7.7	8.7	5.1	9.8	9.6
6	32	8.7	9.6	7.9	8.9	5.3	10.1	9.8
6	40	10.9	12.1	9.9	11.2	6.6	12.7	12.3
8	32	17.8	19.8	16.2	18.4	10.8	20.7	20.2
8	36	19.8	22.0	18.0	20.4	12.0	23.0	22.4
10	24	20.8	22.8	18.6	21.2	13.8	23.8	25.9
10	32	29.7	31.7	25.9	29.3	19.2	33.1	34.9
12	24	---	---	---	---	---	---	---
12	28	---	---	---	---	---	---	---
1/4	20	65.0	75.2	61.5	68.8	45.6	78.8	85.3
1/4	28	90.0	94.0	77.0	87.0	57.0	99.0	106.0
5/16	18	129	132	107	123	80	138	149
5/16	24	139	142	116	131	86	147	160
3/8	16	212	236	192	219	143	247	266
3/8	24	232	259	212	240	157	271	297
7/16	14	338	376	317	349	228	393	427
7/16	20	361	400	327	371	242	418	451
1/2	13	465	517	422	480	313	542	584
1/2	20	487	541	443	502	328	565	613
9/16	12	613	682	558	632	413	713	774
9/16	18	668	752	615	697	456	787	855
5/8	11	1000	1110	907	1030	715	1160	1330
5/8	18	1140	1244	1016	1154	798	1301	1492
3/4	10	1259	1530	1249	1416	980	1582	1832
3/4	16	1230	1490	1220	1382	958	1558	1790
7/8	9	1919	2328	1905	2140	1495	2430	2775
7/8	14	1911	2318	1895	2130	1490	2420	2755
1	8	2832	3440	2815	3185	2205	3595	4130
1	14	2562	3110	2545	2885	1995	3250	3750

The values are stated in foot pounds.

Bolt Size (inches)	Thds Per Inch ttc	SAE 0-1-2 74,000 psi Low Carbon Steel	SAE Grade 3 100,000 psi Med Carbon Steel	SAE Grade 5 120,000 psi Med Carbon Heat T. Steel	SAE Grade 6 133,000 psi Med Carbon Temp. Steel	SAE Grade 7 133,000 psi Med Carbon Alloy Steel	SAE Grade 8 150,000 psi Med Carbon Alloy Steel
1/4	20	6	9	10	12.5	13	14
1/4	28	---	---	---	---	---	---
5/16	18	12	17	19	24	25	29
5/16	24	---	---	---	---	---	---
3/8	16	20	30	33	43	44	47
3/8	24	---	---	---	---	---	---
7/16	14	32	47	54	69	71	78
7/16	20	---	---	---	---	---	---
1/2	13	47	69	78	106	110	119
1/2	20	---	---	---	---	---	---
9/16	12	69	103	114	150	154	169
9/16	18	---	---	---	---	---	---
5/8	11	96	145	154	209	215	230
5/8	11	---	---	---	---	---	---
3/4	10	155	234	257	350	360	380
3/4	10	---	---	---	---	---	---
7/8	9	206	372	382	550	570	600
7/8	9	---	---	---	---	---	---
1	8	310	551	587	825	840	700
1	8	---	---	---	---	---	---
1-1/8	7	480	794	872	1304	1325	1430
1-1/8	7	---	---	---	---	---	---
1-1/4	7	375	1105	1211	1815	1825	1975
1-1/4	7	---	---	---	---	---	---
1-3/8	6	900	1500	1624	2434	2500	2650
1-3/8	6	---	---	---	---	---	---
1-1/2	6	1100	1775	1943	2913	3000	3200
1-1/2	6	---	---	---	---	---	---
1-5/8	5.5	1470	2425	2660	3985	4000	4400
1-5/8	5.5	---	---	---	---	---	---
1-3/4	5	1900	3150	3463	5189	5300	5650
1-3/4	5	---	---	---	---	---	---
1-7/8	5	2360	4200	4695	6980	7000	7600
1-7/8	5	---	---	---	---	---	---
2	4.5	2750	4550	5427	7491	7500	8200
2	4.5	---	---	---	---	---	---

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