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ASTM A574 Technical Data

This specification covers the requirements for quenched and tempered alloy steel hexagon socket-head cap screws.

Technical Data: ASTM A574 Mechanical Requirements ASTM A574 Chemical Requirements ASTM A574 Tensile Requirements for Coarse Thread Screws ASTM A574 Tensile Requirements for Fine Thread Screws ASTM A574 Chemical Composition

	≤0.500 in.	>0.500 in.
Property	Nom. Dia.	Nom. Dia.
Full-size screws:
Tensile or wedge tensile strength, min, ksi	180	170
Proof load (stress), ksi	140	135
Product hardness:
Rockwell (HRC)	39-45	37-45
Machined test specimen:
Yield strength at 0.2% offset, min., ksi	153	153
Tensile strength, min., ksi	180	170
Elongation in 5D, min.	10%	10%
Reduction of area, min.	35%	35%

Screw Dia (D), in.	Threads/ in.	Tensile Load, min, lbf^A	Stress Area, in.^{2 B}	Proof Load (Length Measurement Method), min, lbf^C




0.073	64	473	0.00263	368
0.086	56	666	0.00370	518
0.099	48	877	0.00487	682
0.112	40	1,090	0.00604	846
0.125	40	1,430	0.00796	1,110
0.138	32	1,640	0.00909	1,270
0.164	32	2,520	0.0140	1,960
0.190	24	3,150	0.0175	2,450
0.250	20	5,730	0.0318	4,450
0.3125	18	9,440	0.0524	7,340
0.375	16	13,900	0.0775	10,800
0.4375	14	19,100	0.1063	14,900
0.500	13	25,500	0.1419	19,900
0.625	11	38,400	0.226	30,500
0.750	10	56,800	0.334	45,100
0.875	9	78,500	0.462	62,400
1.000	8	103,000	0.606	81,800
1.125	7	129,000	0.763	103,000
1.250	7	165,000	0.969	131,000
1.375	6	196,000	1.155	156,000
1.500	6	239,000	1.405	190,000
1.750	5	323,000	1.90	256,000
2.000	41⁄2	425,000	2.50	338,000
2.250	41⁄2	552,000	3.25	439,000
2.500	4	680,000	4.00	540,000
2.750	4	838,000	4.93	666,000
3.000	4	1,010,000	5.97	806,000
3.250	4	1,210,000	7.10	958,000
3.500	4	1,420,000	8.33	1,120,000
3.750	4	1,640,000	9.66	1,300,000
4.000	4	1,880,000	11.08	1,500,000

^A Values based on 180 ksi for 0.500 and smaller and 170 ksi for sizes larger than 0.500 in. and stress area in accordance with Footnote B.

^B Stress areas based on Handbook H-28 (U.S. Department of Commerce) as follows:

A_s = 0.7854 [D - (0.9743/ n)]²

where:

A_s = stress area,

D = nominal screw size, and

n = threads/in.

^C Values based on 140 ksi for 0.500 and smaller and 135 ksi for sizes larger than 0.500 in. and stress area in accordance with Footnote B.

Screw Dia (D), in.	Threads/ in.	Tensile Load, min, lbf^A	Stress Area, in.^{2 B}	Proof Load (Length Measurement Method), min, lbf^C




0.060	80	324	0.00180	252
0.073	72	500	0.00278	389
0.086	64	709	0.00394	552
0.099	56	941	0.00523	732
0.112	48	1,190	0.00661	925
0.125	44	1,490	0.00830	1,160
0.138	40	1,830	0.01015	1,420
0.164	36	2,650	0.01474	2,060
0.190	32	3,600	0.0200	2,800
0.250	28	6,500	0.0364	5,100
0.3125	24	10,400	0.0580	8,120
0.375	24	15,800	0.0878	12,300
0.4375	20	21,400	0.1187	16,600
0.500	20	28,800	0.1599	22,400
0.625	18	43,500	0.256	34,600
0.750	16	63,400	0.373	50,400
0.875	14	86,500	0.509	68,700
1.000	12	113,000	0.663	89,500
1.125	12	146,000	0.856	116,000
1.250	12	182,000	1.073	145,000
1.375	12	224,000	1.315	178,000
1.500	12	269,000	1.581	213,000