High Strength Structural Bolts, Nuts, Washers

Description:

Structural bolts are used for applications which require extremely high strength fastening - mostly steel to steel. The fasteners used in structural applications are often shorter, wider and have a larger bearing surface to increase their load-bearing abilities. Structural bolts and nuts from ITA Fasteners comply with national and international standards like the ISO and ASTM. They come in stainless steel, alloy steel, and carbon steel materials and are galvanised for improved durability. We also provide custom structural fasteners like washers for your bolts. Our fasteners come in a wide range of dimensions for all your requirements.

Please note that you CANNOT use structural bolts and nuts in the place of standard bolts and nuts even if it satisfies the dimensional requirements of the application. They come with a different set of mechanical and structural parameters to support larger loads. In fact, they could weaken or create splinters if used on wood to wood or wood to sheet metal applications.

Dimensional Standards:

IS 3757, IS 6623, IS 6649, ISO 7412, ISO 4775, ISO 7415, DIN 6914, DIN 6915, DIN 6916, BS 4395, ASME B18.2.3.7M, B18.2.4.6M, JIS B1186

Size range:

Metric: M16 to M30

High Strength Structural Bolts Dimensions

IS3757: High Strength Structural Bolts

Thread Size d		M16	M20	(M22)	M24	(M27)	M30	M36
P Pitch of thread		2	2.5	2.5	3	3	3.5	4
bref for length / Nom <100/>100		31	36	38	41	44	49	56
bref for length / Nom <100/>100		38	43	45	48	51	56	63
c	Max	0.8	0.8	0.8	0.8	0.8	0.8	0.8
c	Min	0.4	0.4	0.4	0.4	0.4	0.4	0.4
d_a	Max	18.7	23.24	25.24	27.64	31.24	34.24	41.00
d_s	Max	16.70	20.84	22.84	24.84	27.84	30.84	37.00
d_s	Min	15.30	19.16	21.16	23.16	26.16	29.16	35.00
d_w	Max	†	†	†	†	†	†	†
d_w	Min	24.9	31.4	33.3	38.0	42.8	46.5	55.9
e	Min	29.56	37.29	39.55	45.20	50.85	55.37	66.44
k	Nom	10	12.5	14	15	17	18.7	22.5
	Max	10.75	13.40	14.90	15.90	17.90	19.75	23.55
	Min	9.23	11.60	13.10	14.10	16.10	17.65	21.45
k'	Min	6.5	8.1	9.2	9.9	11.3	12.4	15.0
r	Min	0.6	0.8	0.8	1.0	1.2	1.2	1.5
s	Max	27	34	36	41	46	50	60
s	Min	26.16	33	35	40	45	49	58.8
Chamfer length z	Max	3	3.8	3.8	4.5	4.5	5.3	6

Note - Sizes shown in brackets are at second preference,
* For galvanized bolts, dlmension apply before galvanizing.
†d_w, Max = _s actual.

DIN-EN-14399-4: High Strength Structural Bolts

EN 14399-4:2005(E)

Thread d	M12	M16	M20	M22	M24	M27	M30	M36
Pb	1,75	2	2,5	2,5	3	3	3,5	4
b (ref).	23	28	33	34	39	41	44	52
C min.	0,4	0,4	0,4	0,4	0,4	0,4	0,4	0,4
C max.	0,6	0,6	0,8	0,8	0,8	0,8	0,8	0,8
da max.	15,2	19,2	24	26	28	32	35	41
ds nom	12	16	20	22	24	27	30	36
ds min	11,3	15,3	19,16	21,16	23,16	26,16	29,16	35
ds max	12,7	16,7	20,84	22,84	24,84	27,84	30,84	37
dw min	20,1	24,9	29,5	33,3	38,0	42,8	46,6	55,9
dw max	c	c	c	c	c	c	c	c
e min	23,91	29,56	35,03	39,55	45,20	50,85	55,37	66,44
k nom	8	10	13	14	15	17	19	23
k min	7,55	9,25	12,1	13,1	14,1	16,1	17,95	21,95
k max	8,45	10,75	13,9	14,9	15,9	17,9	20,05	24,05
kw min	5,28	6,47	8,47	9,17	9,87	11,27	12,56	15,36
r min	1,2	1,2	1,5	1,5	1,5	2	2	2
s max	22	27	32	36	41	46	50	60
smin	21,16	26,16	31	35	40	45	49	58,8

Thread d			M12		M16		M20		M22		M24		M27		M30		M36
l			ls	lg	ls	lg	ls	lg	ls	lg	ls	lg	ls	lg	ls	lg	ls	lg
nom.	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.
35	33,75	36,25	6,75	12
40	38,75	41,25	11,75	17	6	12
45	43,75	46,25	16,75	22	11	17	4,5	12
50	48,75	51,25	21,75	27	16	22	9,5	17	8,5	16
55	53,5	56,5	26,75	32	21	27	14,5	22	13,5	21
60	58,5	61,5	31,75	37	26	32	19,5	27	18,5	26	12	21
65	63,5	66,5	36,75	42	31	37	24,5	32	23,5	31	17	26
70	68,5	71,5	41,75	47	36	42	29,5	37	28,5	36	22	31	20	29
75	73,5	76,5	46,75	52	41	47	34,5	42	33,5	41	27	36	25	34	20,5	31
80	78,5	81,5	51,75	57	46	52	39,5	47	38,5	46	32	41	30	39	25,5	36
85	83,25	86,75	56,75	62	51	57	44,5	52	43,5	51	37	46	35	44	30,5	41	21	33
90	88,25	91,75	61,75	67	56	62	49,5	57	48,5	56	42	51	40	49	35,5	47	26	38
95	93,25	96,75	66,75	72	61	67	54,5	62	53,5	61	47	56	45	54	40,5	51	31	43
100	98,25	101,75			66	72	59,5	67	58,5	66	52	61	50	59	45,5	56	36	48
105	103,25	106,75			71	77	64,5	72	63,5	71	57	66	55	64	50,5	61	41	53
110	108,25	111,75			76	82	69,5	77	68,5	76	62	71	60	69	55,5	66	46	58
115	113,25	116,75			81	87	74,5	82	73,5	81	67	76	65	74	60,5	71	51	63
120	118,25	121,75			86	92	79,5	87	78,5	86	72	81	70	79	65,5	76	56	68
125	123	127			91	97	84,5	92	83,5	91	77	86	75	84	70,5	81	61	73
130	128	132			96	102	89,5	97	88,5	96	82	91	80	89	75,5	86	66	78
135	133	137					94,5	102	93,5	101	87	96	85	94	80,5	91	71	83
140	138	142					99,5	107	98,5	106	92	101	90	99	85,5	96	76	88
145	143	147					104,5	112	103,5	111	97	106	95	104	90,5	101	81	93
150	148	152					109,5	117	108,5	116	102	111	100	109	95,5	106	86	98
155	153	159					114,5	122	113,5	121	107	116	105	114	100,5	111	91	103
160	158	164							118,5	126	112	121	110	119	105,5	116	96	108
165	163	169							123,5	131	117	126	115	124	110,5	121	101	113
170	168	174									122	131	120	129	115,5	126	106	118
175	173	179									127	136	125	134	120,5	131	111	123
180	178	184									132	141	130	139	125,5	136	116	128
185	182,7	189,6									137	146	135	144	130,5	141	121	133
190	187,7	194,6									142	151	140	149	135,5	146	126	138
195	192,7	199,6									147	156	145	154	140,5	151	131	143
200	197,7	204,6											150	159	147,5	156	136	148

ASME B18.2.6: High Strength Structural Bolts

Dimensions of Heavy Hex Structural Bolts

Table 1 Dimensions of Heavy Hex Structural Bolts
Nominal Size or Basic Product Diameter [Note (1)]
		Body Diameter, E [Note (2)]		Width Across Flats, F [Note (3)]			Width Across Corners, G		Head Height, H [Note (4)]			Radius of Fillet, R		Thread Length, L_T [Note (5)]	Transition Thread Length, Y [Note (5)]	Total Runout of Bearing Surface FIM [Note (6)]
		Max.	Min.	Nominal	Max.	Min.	Max.	Min.	Nominal	Max.	Min.	Max.	Min.	Ref.	Ref.	Max.
1/2	0.500	0.515	0.482	7/8	0.875	0.850	1.010	0.969	5/16	0.323	0.302	0.031	0.009	1.00	0.19	0.016
5/8	0.625	0.642	0.605	1 1/16	1.062	1.031	1.227	1.175	25/64	0.403	0.378	0.062	0.021	1.25	0.22	0.019
3/4	0.750	0.768	0.729	1 1/4	1.250	1.212	1.443	1.383	25/32	0.483	0.455	0.062	0.021	1.38	0.25	0.022
7/8	0.875	0.895	0.852	1 7/16	1.438	1.394	1.660	1.589	35/64	0.563	0.531	0.062	0.031	1.5	0.28	0.025
1	1.000	1.022	0.976	1 5/8	1.625	1.575	1.876	1.796	39/64	0.627	0.591	0.093	0.062	1.75	0.31	0.028
1 1/8	1.125	1.149	1.098	1 13/16	1.812	1.756	2.093	2.002	11/16	0.718	0.658	0.093	0.062	2.00	0.34	0.032
1 1/4	1.250	1.277	1.223	2	2.000	1.938	2.309	2.209	25/32	0.813	0.749	0.093	0.062	2.00	0.38	0.035
1 3/8	1.375	1.404	1.345	2 3/16	2.188	2.119	2.526	2A16	27/32	0.878	0.810	0.093	0.062	2.25	0.44	0.038
1 1/2	1.500	1.531	1.470	2 3/8	2.375	2.300	2.742	2.622	15/16	0.974	0.902	0.093	0.062	2.25	0.44	0.041