NON PRELOADED STEEL BOLTS

Dimensions

	Area (mm²)	Pitch (mm)	Core diameter (mm)	Width A/F (mm)	Width A/C (mm)	Head Thickness (mm)	Nut thickness (mm)	Standard hole dia (mm)	Min edge distance (mm)	Clearance (mm)	Washer diameter (mm)	Washer thickness (mm)
M6	20.1	1	4.77	10	11.55	4.375	5.375	7	10	8	12.5	1.6	M6
M8	36.6	1.25	6.46	13	15.01	5.875	6.5	9	15	11	17	1.6	M8
M10	58	1.5	8.16	17	19.63	7.45	8	11	15	13	21	2	M10
M12	84.3	1.75	9.85	19	21.94	8.45	10	13	20	15	24	2.5	M12
M16	157	2	13.55	24	27.71	10.45	13	18	25	18	30	3	M16
M20	245	2.5	16.93	30	34.64	13.9	16	22	30	23	37	3	M20
M24	353	3	20.32	36	41.57	15.9	19	26	35	29	44	4	M24
M30	561	3.5	25.71	46	53.12	20.05	24	33	45	35	56	4	M30
M36	817	4	31.09	55	63.51	24.05	29	39	50	41	66	5	M36
M42	1120	4.5	36.68	65	75.06	27.05	34	45	60	47	78	7	M42
M48	1470	5	41.86	75	86.60	31.05	38	51	65	55	92	8	M48
M56	2030	5.5	49.25	85	98.15	36.25	45	59	75	70	105	9	M56
M64	2680	6	56.64	95	109.70	41.25	51	67	85	75	115	9	M64

Grade	Shear strength (N/mm²)	Tensile strength (N/mm²)	Bearing strength (N/mm²)
4.6	160	240	460
8.8	375	560	1000
10.9	400	700	1300
HSFG ≤ M24	400	590	1000
HSFG > 24	350	515	900

	Grade	8.8						Shear capacity bearing width				10.9
	Area	Tension capacity (kN)	Shear capacity (kN)	Shear capacity for packing (kN)			Maximum packing (mm)	Single Shear (mm)		Double Shear (mm)		Tension capacity (kN)	Shear capacity (kN)
				10 mm	20 mm	Maximum		S275	S355	S275	S355
M6	20.1	11.3	7.54	-	-	5.66	8	4	3	8	6	14.1	8.04
M8	36.6	20.5	13.7	10.5	-	10.5	10	4	4	8	8	25.6	14.6
M10	58	32.5	21.8	17.8	-	16.5	13	8	6	15	12	40.6	23.2
M12	84.3	47.2	31.6	27.1	-	23.7	16	8	6	15	12	59	33.7
M16	157	87.9	58.9	53.7	45.1	44.4	21	12	10	25	20	110	62.8
M20	245	137	91.9	87.1	75.2	69.5	26	15	12	35	25	172	98
M24	353	198	132	128	113	99	32	20	15	35	35	247	141
M30	561	314	210	210	189	158	40	25	20	45	35	393	224
M36	817	458	306	306	285	230	48	35	25	60	45	572	327
M42	1120	627	420	420	401	315	56	35	35	65	60	784	448
M48	1470	823	551	551	536	413	64	40	35	75	65	1029	588
M56	2030	1137	761	761	755	572	74	45	40	90	75	1421	812
M64	2680	1501	1005	1005	1005	755	85	60	45	120	90	1876	1072

Grade	Proof Stress (N/mm²)	Torque (Nm) to achieve tensile stress of 85% proof stress
		M12	M16	M20	M24	M30	M36
8.8	571	98	244	476	822	1634	2855
10.9	777	134	332	646	1120	2223	3885
12.9	932	160	397	775	1342	2666	4660
Torque on fixings in tension should be calculated using Serviceability Limit State Loads
Torque = (Bolt Tensile Stress x Torque at 85% Proof Stress) / (0.85 x Proof Stress)

SCI:P291 Design Manual For Structural Stainless Steel (First Edition)

Grade	A1, A2, A3, A4 and A5
Class	Ultimate tensile strength (N/mm²)	Stress at 0.2% perm strain (N/mm²)	Tensile strength (N/mm²)	Shear strength (N/mm²)	Bearing strength (N/mm²)
50	500	210	210	145	511
70	700	450	450	311	828
80	800	600	560	384	1008

Class		50		70		80		Shear capacity reduction factor for packing (BS5950-1:2000 Cl 5.2.3)
Size	Area (mm²)	Tension capacity (kN)	Shear capacity (kN)	Tension capacity (kN)	Shear capacity (kN)	Tension capacity (kN)	Shear capacity (kN)	Packing thickness			Maximum packing (mm)	Size
								10 mm	20 mm	Maximum
M6	20.1	4.22	2.91	9.05	6.24	11.3	7.72	-	-	0.75	8	M6
M8	36.6	7.69	5.3	16.5	11.4	20.5	14.1	0.77	-	0.77	10	M8
M10	58	12.2	8.4	26.1	18	32.5	22.3	0.82	-	0.76	13	M10
M12	84.3	17.7	12.2	37.9	26.2	47.2	32.4	0.86	-	0.75	16	M12
M16	157	33	22.7	70.7	48.7	87.9	60.3	0.91	0.77	0.75	21	M16
M20	245	51.5	35.5	110	76.1	137	94.1	0.95	0.82	0.76	26	M20
M24	353	74.1	51.1	159	110	198	136	0.97	0.86	0.75	32	M24
M30	561	118	81.3	-	-	-	-	1.00	0.90	0.75	40	M30
M36	817	172	118	-	-	-	-	1.00	0.93	0.75	48	M36

BS4604 : Part 1 : 1970 and BS5950 : Part 1 : 2000

Grade	Tensile strength (N/mm²)	Shear strength (N/mm²)	Bearing strength (N/mm²)
HSFG ≤ M24	590	400	1000
HSFG > 24	515	350	900

Class	Surface Preparation	Surface Treatment	Slip factor µ
A	Blasted with shot or grit	Loose rust removed, no pitting Spray metallized with aluminium Spray metallized with zinc proven at μ = 0.5	0.5
B	Blasted with shot or grit	Spray metallized with zinc	0.4
C	Wire brushed / Flame Cleaned	Loose rust removed, tight mill scale	0.3
D	Untreated / Galvanized	Untreated	0.2

Size	Minimum shank tension (kN)	Tension capacity (kN)	Shear capacity (kN)	Slip Resistance Connections non-slip in service (kN)				Slip Resistance Connections non-slip under factored load (kN)				Size
				μ=0.2	μ=0.3	μ=0.4	μ=0.5	μ=0.2	μ=0.3	μ=0.4	μ=0.5
M12	49.4	49.7	33.7	10.9	16.3	21.7	27.2	8.9	13.3	17.8	22.2	M12
M16	92.1	92.6	62.8	20.3	30.4	40.5	50.7	16.6	24.9	33.2	41.4	M16
M20	144	145	98	31.7	47.5	63.4	79.2	25.9	38.9	51.8	64.8	M20
M24	207	208	141	45.5	68.3	91.1	113.9	37.3	55.9	74.5	93.2	M24
M30	286	289	196	62.9	94.4	125.8	157.3	51.5	77.2	103.0	128.7	M30
M36	418	421	286	92.0	137.9	183.9	229.9	75.2	112.9	150.5	188.1	M36

Hole Type	Reduction Factor
Standard clearance holes	1
Oversize holes or short slotted holes	0.85
Long slotted holes, loaded perpendicular to slot	0.85
Long slotted holes, loaded parallel to slot	0.7

Size	Grip length of bolt for specified nut rotation to achieve minimum shank tension
	Not less than ½ turn	Not less than ¾ turn
M16	Up to 115 mm	-
M20	Up to 115 mm	Over 115 to 225 mm
M24	Up to 160 mm	Over 160 to 275 mm
M30	Up to 160 mm	Over 160 to 275 mm
M36	Up to 160 mm	Over 160 to 275 mm