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US Bolts - Tensile Strength and Proof Loads

Tensile strength and proof loads SAE bolts.

Proof Load - is the maximum tensile force that can be applied to a bolt that will not result in plastic deformation
Clamp load - equals to 75% of proof load

US Bolts - Coarse Threads

Proof Load

US Bolts Coarse Threads - Proof Loads
Nom Bolt Size (in)	Grade
	2	5	8	Lamalloy
	Proof Load (lb_f )
1/4	1750	2700	3800	4600
5/16	2900	4450	6300	7600
3/8	4250	6600	9300	11250
7/16	5850	9050	12800	15400
1/2	7800	12100	17000	20600
9/16	10000	15500	21800	26400
5/8	12400	19200	27100	32750
3/4	18400	28400	40100	48500
7/8	15200	39300	55400	67000
1	20000	51500	72700	87900
1 1/8	25200	56500	91600	110700
1 1/4	32000	71700	116300	140500
1 3/8	38100	85500	138600	167500
1 1/2	46400	104000	168600	203700

Clamp Load

US Bolts Coarse Threads - Clamp Loads
Nom Bolt Size (in)	Grade
	2	5	8	Lamalloy
	Clamp Load (lb_f )
1/4	1313	2025	2850	3450
5/16	2175	3338	4725	5700
3/8	3188	4950	6975	8438
7/16	4388	6788	9600	11550
1/2	5850	9075	12750	15450
9/16	7500	11625	16350	19800
5/8	9300	14400	20325	24563
3/4	13800	21300	30075	36375
7/8	11400	29475	41550	50250
1	15000	38625	54525	65925
1 1/8	18900	42375	68700	83025
1 1/4	24000	53775	87225	105375
1 3/8	28575	64125	103950	125625
1 1/2	34800	78000	126450	152775

Metric Bolts - Minimum Ultimate Tensile and Proof Loads

US Bolts - Fine Threads

Proof Load

US Bolts Fine Threads - Proof Loads
Nom Bolt Size (in)	Grade
	2	5	8	Lamalloy
	Proof Load (lb)
1/4	2000	3100	4350	5280
5/16	3200	4900	6950	8410
3/8	4800	7450	10500	12730
7/16	6550	10100	14200	17200
1/2	8800	13600	19200	23200
9/16	11200	17300	24400	29450
5/8	14100	21800	30700	37100
3/4	20500	31700	44800	54100
7/8	16800	43300	61100	73800
1	21900	56400	79600	96200
1 1/8	28200	63350	102700	124100
1 1/4	35400	79400	128800	155600
1 3/8	43400	97300	157800	190700
1 1/2	52200	117000	189700	229200

Clamp Load

US Bolts Fine Threads - Clamp Loads
Nom Bolt Size (in)	Grade
	2	5	8	Lamalloy
	Clamp Load (lb)
1/4	1500	2325	3263	3960
5/16	2400	3675	5213	6308
3/8	3600	5588	7875	9548
7/16	4913	7575	10650	12900
1/2	6600	10200	14400	17400
9/16	8400	12975	18300	22088
5/8	10575	16350	23025	27825
3/4	15375	23775	33600	40575
7/8	12600	32475	45825	55350
1	16425	42300	59700	72150
1 1/8	21150	47513	77025	93075
1 1/4	26550	59550	96600	116700
1 3/8	32550	72975	118350	143025
1 1/2	39150	87750	142275	171900

Grade 2 - Low Carbon Steel - up to 3/4" proof load 55000 psi, minimum tensile strength 74000 psi - 3/4" - 1/1/2" proof load 33000 psi, minimum tensile strength 66000 psi
Grade 5 - Medium Carbon Steel, Quenched and Tempered - up to 1" proof load 85000 psi - 1" - 1/1/2" proof load 74000 psi, minimum tensile strength 105000 psi
Grade 8 - Medium Carbon Alloy Steel, Quenched and Tempered - up to 1 1/2" proof load 120000 psi, minimum tensile strength 150000 psi
Lamalloy - Medium Carbon Alloy Steel, Quenched and Tempered - up to 1 1/2" proof load 145000 psi, minimum tensile strength 180000 psi
1 psi = 6.9 kPa

Related Topics

Fasteners
Bolts, nuts and threaded rods - torque, tension and loads.

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