Tensile Strength | SLS Bolts & Nuts

The ISO 898 Part 1 specifies mechanical and physical properties of bolts, screws and studs made of carbon steel and alloy steel when tested at the temperature range of 10 °C to 35 °C.

Minimum Ultimate Tensile Loads - ISO Metric Coarse Pitch Thread

Thread, d	Nominal stress area, mm²	4.8	6.8	8.8	10.9	12.9
Thread, d	Nominal stress area, mm²	Minimum ultimate tensile load, N
M3	5.03	2,110	3,020	4,020	5,230	6,140
M4	8.78	3,690	5,270	7,020	9,130	10,700
M5	14.2	5,960	8,520	11,350	14,800	17,300
M6	20.1	8,440	12,100	16,100	20,900	24,500
M8	36.6	15,400	22,000	29,200**	38,100**	44,600
M10	58	24,400	34,800	46,400**	60,300**	70,800
M12	84.3	35,400	50,600	67,400	87,700	103,000
M14	115	48,300	69,000	92,000	120,000	140,000
M16	157	65,900	94,000	125,000	163,000	192,000
M18	192	80,600	115,000	159,000	200,000	234,000
M20	245	103,000	147,000	203,000	255,000	299,000
M22	303	127,000	182,000	252,000	315,000	370,000
M24	353	148,000	212,000	293,000	367,000	431,000
M27	459	193,000	275,000	381,000	477,000	560,000
M30	561	236,000	337,000	466,000	583,000	684,000
M33	694	292,000	416,000	576,000	722,000	847,000
M36	817	343,000	490,000	678,000	850,000	997,000
M39	976	410,000	586,000	810,000	1,020,000	1,200,000

** For fasteners with thread tolerance 6az according to ISO 965-4 subject to hot dip galvanizing, reduced values in accordance with ISO 10684:2004, Annex A, apply.

Proof Loads for Hexagon Bolts - ISO Metric Coarse Pitch Thread

Thread, d	Nominal stress area, mm²	4.8	6.8	8.8	10.9	12.9
Thread, d	Nominal stress area, mm²	Proof Load, N
M3	5.03	1,560	2,210	2,920	4,180	4,880
M4	8.78	2,720	3,860	5,100	7,290	8,520
M5	14.2	4,400	6,250	8,230	11,800	13,800
M6	20.1	6,230	8,840	11,600	16,700	19,500
M8	36.6	11,400	16,100	21,200**	30,400**	35,500
M10	58	18,000	25,500	33,700**	48,100**	56,300
M12	84.3	26,100	37,100	48,900	70,000	81,800
M14	115	35,600	50,600	66,700	95,500	112,000
M16	157	48,700	69,100	91,000	130,000	152,000
M18	192	59,500	84,500	115,000	159,000	186,000
M20	245	76,000	108,000	147,000	203,000	238,000
M22	303	93,900	133,000	182,000	252,000	294,000
M24	353	109,000	155,000	212,000	293,000	342,000
M27	459	142,000	202,000	275,000	381,000	445,000
M30	561	174,000	247,000	337,000	466,000	544,000
M33	694	215,000	305,000	416,000	576,000	673,000
M36	817	253,000	359,000	490,000	678,000	792,000
M39	976	303,000	429,000	586,000	810,000	947,000

** For fasteners with thread tolerance 6az according to ISO 965-4 subject to hot dip galvanizing, reduced values in accordance with ISO 10684:2004, Annex A, apply.

SAE J429 specifies the requirements for high tensile and alloy steel inch-series bolts, screws and studs. Sizes covered range from ¼" to 1-½" diameter.

Minimum Tensile Load and Proof Load for ANSI B18.2.1 Hex Bolt (UNC Thread)

Size	Stress Area (in ²)	Min Tensile Load (lbf)		Min Proof Load (lbf)
Size	Stress Area (in ²)	Grade 5	Grade 8	Grade 5	Grade 8
1/4"‑20	0.0318	3,800	4,750	2,700	3,800
5/16"‑18	0.0524	6,300	7,850	4,450	6,300
3/8"‑16	0.0775	9,300	11,600	6,600	9,300
7/16"‑14	0.1063	12,800	15,900	9,050	12,800
1/2"‑13	0.1419	17,000	21,300	12,100	17,000
9/16"‑12	0.182	21,800	27,300	15,500	21,800
5/8"‑11	0.226	27,100	33,900	19,200	27,100
3/4"‑10	0.334	40,100	50,100	28,400	40,100
7/8"‑9	0.462	55,400	69,300	39,300	55,400
1"‑8	0.606	72,700	90,900	51,500	72,700
1-1/8"‑7	0.763	80,100	114,400	56,500	91,600
1-1/4"‑7	0.969	101,700	145,400	71,700	116,300
1-3/8"‑6	1.155	121,300	173,200	85,500	138,600
1-1/2"‑6	1.405	147,500	210,800	104,000	168,600

Minimum Tensile Load and Proof Load for ANSI B18.2.1 Hex Bolt (UNF Thread)

Size	Stress Area (in ²)	Min Tensile Load (lbf)		Min Proof Load (lbf)
Size	Stress Area (in ²)	Grade 5	Grade 8	Grade 5	Grade 8
1/4"-28	0.0364	4,350	5,450	3,100	4,350
5/16"-24	0.058	6,950	8,700	4,900	6,950
3/8"-24	0.0878	10,500	13,200	7,450	10,500
7/16"-20	0.1187	14,200	17,800	10,100	14,200
1/2"-20	0.1599	19,200	24,000	13,600	19,200
9/16"-18	0.203	24,400	30,400	17,300	24,400
5/8"-18	0.256	30,700	38,400	21,800	30,700
3/4"-16	0.373	44,800	56,000	31,700	44,800
7/8"-14	0.509	61,100	76,400	43,300	61,100
1"-12	0.663	79,600	99,400	56,400	79,600
1-1/8"-12	0.856	89,900	128,400	63,300	102,700
1-1/4"-12	1.073	112,700	161,000	79,400	128,800
1-3/8"-12	1.315	138,100	197,200	97,300	157,800
1-1/2"-12	1.581	166,000	237,200	117,000	189,700

For detailed information, please refer to complete governing standards.