Suggested Torque Values & Bolt Clamp Loads

Tensile Strength

Diameter & Thread	Grade 2 Tensile Strength	Grade 5 Tensile Strength	Grade 8 Tensile Strength
UNC & UNF 1/4" to 1-1/2"	74 MIN KSI.	120 MIN KSI.	150 MIN KSI.

Proof Load

Diameter & Thread	Grade 2 Proof Load	Grade 5 Proof Load	Grade 8 Proof Load
1/4" - 20	1750 lbs.	2700 lbs.	3800 lbs.
1/4" - 28	2000 lbs.	3100 lbs.	4350 lbs.
5/16" - 18	2900 lbs.	4500 lbs.	6300 lbs.
5/16" - 24	3200 lbs.	4900 lbs.	6950 lbs.
3/8" - 16	4250 lbs.	6600 lbs.	9300 lbs.
3/8" - 24	4800 lbs.	7450 lbs.	10500 lbs.
7/16" - 14	5850 lbs.	9050 lbs.	12800 lbs.
7/16" - 20	6550 lbs.	10100 lbs.	14200 lbs.
1/2" - 13	7800 lbs.	12100 lbs.	17000 lbs.
1/2" - 20	8800 lbs.	13600 lbs.	19200 lbs.
9/16" - 12	10000 lbs.	15500 lbs.	21800 lbs.
9/16" - 18	11200 lbs.	17300 lbs.	24400 lbs.
5/8" - 11	12400 lbs.	19200 lbs.	27100 lbs.
5/8" - 11	14100 lbs.	21800 lbs.	30700 lbs.
3/4" - 10	18400 lbs.	28400 lbs.	40100 lbs.
3/4" - 16	20500 lbs.	31700 lbs.	44800 lbs.
7/8" - 9	15200 lbs.	39300 lbs.	55400 lbs.
7/8" - 14	16800 lbs.	43300 lbs.	61100 lbs.
1" - 8	20000 lbs.	51500 lbs.	72700 lbs.
1" - 14	22400 lbs.	57700 lbs.	81500 lbs.
1-1/8" - 7	25200 lbs.	56500 lbs.	91600 lbs.
1-1/8" - 12	28200 lbs.	63300 lbs.	102700 lbs.
1-1/4" - 7	32000 lbs.	71700 lbs.	116300 lbs.
1-1/4" - 12	35400 lbs.	79400 lbs.	128800 lbs.
1-1/2" - 6	46400 lbs.	104000 lbs.	168600 lbs.
1-1/2" - 6	52200 lbs.	117000 lbs.	189700 lbs.

Clamp Load

Diameter & Thread	Grade 2 Clamp Load	Grade 5 Clamp Load	Grade 8 Clamp Load
1/4" - 20	1310 lbs.	2020 lbs.	2850 lbs.
1/4" - 28	1500 lbs.	2320 lbs.	3250 lbs.
5/16" - 18	2160 lbs.	3340 lbs.	4700 lbs.
5/16" - 24	2400 lbs.	3700 lbs.	5200 lbs.
3/8" - 16	3200 lbs.	4950 lbs.	6980 lbs.
3/8" - 24	3620 lbs.	5600 lbs.	7900 lbs.
7/16" - 14	4380 lbs.	6780 lbs.	9550 lbs.
7/16" - 20	4900 lbs.	7570 lbs.	10650 lbs.
1/2" - 13	5850 lbs.	9050 lbs.	12750 lbs.
1/2" - 20	6600 lbs.	10200 lbs.	14400 lbs.
9/16" - 12	7500 lbs.	11600 lbs.	16350 lbs.
9/16" - 18	8400 lbs.	12950 lbs.	18250 lbs.
5/8" - 11	9320 lbs.	14400 lbs.	20350 lbs.
5/8" - 11	10560 lbs.	16350 lbs.	23000 lbs.
3/4" - 10	13800 lbs.	21300 lbs.	30100 lbs.
3/4" - 16	15390 lbs.	23780 lbs.	33500 lbs.
7/8" - 9	11430 lbs.	29450 lbs.	41600 lbs.
7/8" - 14	12600 lbs.	32450 lbs.	45800 lbs.
1" - 8	15000 lbs.	38600 lbs.	54500 lbs.
1" - 14	16800 lbs.	43300 lbs.	61100 lbs.
1-1/8" - 7	18900 lbs.	42300 lbs.	68700 lbs.
1-1/8" - 12	21200 lbs.	47500 lbs.	77000 lbs.
1-1/4" - 7	24000 lbs.	53800 lbs.	87200 lbs.
1-1/4" - 12	26550 lbs.	59600 lbs.	96600 lbs.
1-1/2" - 6	34800 lbs.	78000 lbs.	126500 lbs.
1-1/2" - 6	39150 lbs.	87700 lbs.	142200 lbs.

Torque

	Grade 2		Grade 5		Grade 8
Diameter & Thread	DRY	LUB.	DRY	LUB.	DRY	LUB.
1/4" - 20	5.5 ft. lb.	4.2 ft. lb.	8 ft. lb.	6.3 ft. lb.	12 ft. lb.	9 ft. lb.
1/4" - 28	6.3 ft. lb.	4.7 ft. lb.	10 ft. lb.	7.2 ft. lb.	14 ft. lb.	10 ft. lb.
5/16" - 18	11 ft. lb.	8 ft. lb.	17 ft. lb.	13 ft. lb.	24 ft. lb.	18 ft. lb.
5/16" - 24	12 ft. lb.	9 ft. lb.	19 ft. lb.	14 ft. lb.	27 ft. lb.	20 ft. lb.
3/8" - 16	20 ft. lb.	15 ft. lb.	30 ft. lb.	23 ft. lb.	45 ft. lb.	35 ft. lb.
3/8" - 24	23 ft. lb.	17 ft. lb.	35 ft. lb.	25 ft. lb.	50 ft. lb.	35 ft. lb.
7/16" - 14	32 ft. lb.	24 ft. lb.	50 ft. lb.	35 ft. lb.	70 ft. lb.	50 ft. lb.
7/16" - 20	36 ft. lb.	27 ft. lb.	55 ft. lb.	40 ft. lb.	80 ft. lb.	60 ft. lb.
1/2" - 13	50 ft. lb.	35 ft. lb.	75 ft. lb.	55 ft. lb.	110 ft. lb.	80 ft. lb.
1/2" - 20	55 ft. lb.	40 ft. lb.	85 ft. lb.	65 ft. lb.	120 ft. lb.	90 ft. lb.
9/16" - 12	70 ft. lb.	55 ft. lb.	110 ft. lb.	80 ft. lb.	150 ft. lb.	110 ft. lb.
9/16" - 18	80 ft. lb.	60 ft. lb.	120 ft. lb.	90 ft. lb.	170 ft. lb.	130 ft. lb.
5/8" - 11	100 ft. lb.	75 ft. lb.	150 ft. lb.	110 ft. lb.	210 ft. lb.	160 ft. lb.
5/8" - 11	110 ft. lb.	85 ft. lb.	170 ft. lb.	130 ft. lb.	240 ft. lb.	180 ft. lb.
3/4" - 10	175 ft. lb.	130 ft. lb.	260 ft. lb.	200 ft. lb.	380 ft. lb.	280 ft. lb.
3/4" - 16	200 ft. lb.	140 ft. lb.	300 ft. lb.	220 ft. lb.	420 ft. lb.	310 ft. lb.
7/8" - 9	170 ft. lb.	125 ft. lb.	430 ft. lb.	320 ft. lb.	600 ft. lb.	450 ft. lb.
7/8" - 14	180 ft. lb.	140 ft. lb.	470 ft. lb.	350 ft. lb.	670 ft. lb.	500 ft. lb.
1" - 8	250 ft. lb.	190 ft. lb.	640 ft. lb.	480 ft. lb.	910 ft. lb.	680 ft. lb.
1" - 14	280 ft. lb.	210 ft. lb.	720 ft. lb.	540 ft. lb.	1020 ft. lb.	760 ft. lb.
1-1/8" - 7	350 ft. lb.	270 ft. lb.	790 ft. lb.	590 ft. lb.	1290 ft. lb.	970 ft. lb.
1-1/8" - 12	400 ft. lb.	300 ft. lb.	890 ft. lb.	670 ft. lb.	1440 ft. lb.	1080 ft. lb.
1-1/4" - 7	500 ft. lb.	380 ft. lb.	1120 ft. lb.	840 ft. lb.	1820 ft. lb.	1360 ft. lb.
1-1/4" - 12	550 ft. lb.	420 ft. lb.	1240 ft. lb.	930 ft. lb.	2010 ft. lb.	1510 ft. lb.
1-1/2" - 6	870 ft. lb.	650 ft. lb.	1950 ft. lb.	1460 ft. lb.	1360 ft. lb.	2370 ft. lb.
1-1/2" - 6	980 ft. lb.	730 ft. lb.	220 ft. lb.	1640 ft. lb.	3560 ft. lb.	2670 ft. lb.

Please Note:
The above specifications are offered as a guide ONLY. Specifications should be determined with assembly conditions taken into account.

Last Updated: Sep 17, 2019

Update History:

Sep 17, 2019 by bbasile from Calgary Fasteners

Jun 18, 2019 by jsjohnson from Calgary Fasteners

Dec 12, 2016 by jsjohnson from Calgary Fasteners

May 16, 2016 by jsjohnson from Calgary Fasteners

May 13, 2016 by jsjohnson from Calgary Fasteners

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