This product is regulated by the following standards:

ASME B18.5 TABLE 7 ASME B18.5 TABLE 1 ASME B18.5 TABLE 5 ASME B18.5 TABLE 2 ASME B18.5 TABLE 3 ASME B18.5 TABLE 6 ASME B18.5 TABLE 8 ASME B18.5 TABLE 9 ASME B18.5 TABLE 10 ASME B18.5 TABLE 4

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Round head bolts, inch series

This product is regulated by the following standards:

Standard ASME B18.5 TABLE 7

Countersunk Bolts and Slotted Countersunk Bolts

Dimensions in inches - source ASME B18.5 Table 7 Publication date: 2008
Nominal size or basic bolt Diameter	E		A			H		J		T
Nominal size or basic bolt Diameter	Max	Min	Max	Min	Absolute Min Edge Rounded or Flat	Max	Min	Max	Min	Max	Min
1/4 (0.2500)	0.260	0.237	0.493	0.477	0.4456	0.150	0.131	0.075	0.064	0.068	0.045
5/16 (0.3125)	0.324	0.298	0.618	0.598	0.558	0.189	0.164	0.054	0.072	0.086	0.057
3/8 (0.3750)	0.388	0.360	0.740	0.715	0.68	0.225	0.196	0.094	0.081	0.103	0.068
7/16 (0.4375)	0.452	0.421	0.803	0.778	0.726	0.226	0.196	0.094	0.081	0.130	0.068
1/2 (0.5000)	0.515	0.483	0.935	0.905	0.45	0.269	0.223	0.106	0.091	0.103	0.068
5/8 (0.6250)	0.642	0.605	1.169	1.132	1.066	0.336	0.292	0.133	0.116	0.137	0.091
3/4 (0.7500)	0.768	0.729	1.402	1.357	1.285	0.403	0.349	0.149	0.131	0.171	0.115
7/8 (0.8750)	0.895	0.852	1.637	1.584	1.511	0.470	0.408	0.167	0.147	0.206	0.138
1 (1.000)	1.022	0.976	1.869	1.810	1.735	0.537	0.466	0.188	0.166	0.240	0.162
1-1/8 (1.1250)	1.149	1.098	2.104	2.037	1.962	0.604	0.525	0.196	0.178	0.257	0.173
1-1/4 (1.2500)	1.277	1.223	2.337	2.262	2.187	0.671	0.582	0.211	0.193	0.291	0.197
1-3/8 (1.3750)	1.404	1.345	2.571	2.489	2.414	0.738	0.641	0.226	0.208	0.326	0.220
1-1/2 (1.5000)	1.531	1.470	2.804	2.715	2.640	0.805	0.698	0.258	0.240	0.360	0.244

Standard ASME B18.5 TABLE 1

Round head bolts

Dimensions in inches - source ASME B18.5 Table 1 Publication date:2008
Nominal size or basic bolt Diameter	E		A		H
	Body Diameter		Head Diameter		Head Height
	Max	Min	Max	Min	Max	Min
No.10 ( 0.1900)	0.199	0.182	0.469	0.438	0.114	0.094
1/4 (0.2500)	0.260	0.237	0.594	0.563	0.145	0.125
5/16 (0.3125)	0.324	0.298	0.719	0.688	0.176	0.156
3/8 (0.3750)	0.388	0.360	0.844	0.782	0.208	0.188
7/16 (0.4375)	0.452	0.421	0.969	0.907	0.239	0.219
1/2 (0.5000)	0.515	0.483	1.094	1.032	0.270	0.250
5/8 (0.6250)	0.642	0.605	1.344	1.219	0.344	0.313
3/4(0.7500)	0.768	0.729	1.594	1.469	0.406	0.375
7/8 (0.8750)	0.895	0.852	1.719	1.719	0.469	0.438

Standard ASME B18.5 TABLE 5

Round Head Fin Neck Bolts

Dimensions in inches - source ASME B18.5 Table 5 Publication date: 2008
Nominal size or basic bolt Diameter	E		A		H		P		O
Nominal size or basic bolt Diameter	Max	Min	Max	Min	Max	Min	Max	Min	Max	Min
No.10 ( 0.1900)	0.199	0.182	0.469	0.438	0.114	0.094	0.125	0.094	0.199	0.185
1/4 (0.2500)	0.260	0.237	0.594	0.563	0.145	0.125	0.156	0.125	0.260	0.245
5/16 (0.3125)	0.324	0.298	0.719	0.688	0.176	0.156	0.187	0.156	0.324	0.307
3/8 (0.3750)	0.388	0.360	0.844	0.782	0.208	0.188	0.219	0.188	0.388	0.368
7/16 (0.4375)	0.452	0.421	0.969	0.907	0.239	0.219	0.250	0.219	0.452	0.431
1/2 (0.5000)	0.515	0.483	1.094	1.032	0.270	0.250	0.281	0.250	0.515	0.492
5/8 (0.6250)	0.642	0.605	1.344	1.219	0.344	0.313	0.344	0.313	0.642	0.616
3/4(0.7500)	0.768	0.729	1.594	1.469	0.406	0.375	0.406	0.375	0.768	0.741
7/8 (0.8750)	0.895	0.852	1.719	1.719	0.469	0.438	0.496	0.438	0.895	0.865

Standard ASME B18.5 TABLE 2

Round head sqaure neck bolts

Dimensions in inches - source ASME B18.5 Table 2 Publication date: 2008
Nominal size or basic bolt Diameter	E		A		H		P		O
Nominal size or basic bolt Diameter	Max	Min	Max	Min	Max	Min	Max	Min	Max	Min
No.10 ( 0.1900)	0.199	0.182	0.469	0.438	0.114	0.094	0.125	0.094	0.199	0.185
1/4 (0.2500)	0.260	0.237	0.594	0.563	0.145	0.125	0.156	0.125	0.260	0.245
5/16 (0.3125)	0.324	0.298	0.719	0.688	0.176	0.156	0.187	0.156	0.324	0.307
3/8 (0.3750)	0.388	0.360	0.844	0.782	0.208	0.188	0.219	0.188	0.388	0.368
7/16 (0.4375)	0.452	0.421	0.969	0.907	0.239	0.219	0.250	0.219	0.452	0.431
1/2 (0.5000)	0.515	0.483	1.094	1.032	0.270	0.250	0.281	0.250	0.515	0.492
5/8 (0.6250)	0.642	0.605	1.344	1.219	0.344	0.313	0.344	0.313	0.642	0.616
3/4(0.7500)	0.768	0.729	1.594	1.469	0.406	0.375	0.406	0.375	0.768	0.741
7/8 (0.8750)	0.895	0.852	1.719	1.719	0.469	0.438	0.496	0.438	0.895	0.865

Standard ASME B18.5 TABLE 3

Round head short square neck bolts

Dimensions in inches - source ASME B18.5 Tabel 3 Publication date: 2008
Nominal size or basic bolt Diameter	E		A		H		P		O
Nominal size or basic bolt Diameter	Max	Min	Max	Min	Max	Min	Max	Min	Max	Min
No.10 ( 0.1900)	0.199	0.182	0.469	0.438	0.114	0.094	0.125	0.094	0.199	0.185
1/4 (0.2500)	0.260	0.237	0.594	0.563	0.145	0.125	0.156	0.125	0.260	0.245
5/16 (0.3125)	0.324	0.298	0.719	0.688	0.176	0.156	0.187	0.156	0.324	0.307
3/8 (0.3750)	0.388	0.360	0.844	0.782	0.208	0.188	0.219	0.188	0.388	0.368
7/16 (0.4375)	0.452	0.421	0.969	0.907	0.239	0.219	0.250	0.219	0.452	0.431
1/2 (0.5000)	0.515	0.483	1.094	1.032	0.270	0.250	0.281	0.250	0.515	0.492
5/8 (0.6250)	0.642	0.605	1.344	1.219	0.344	0.313	0.344	0.313	0.642	0.616
3/4(0.7500)	0.768	0.729	1.594	1.469	0.406	0.375	0.406	0.375	0.768	0.741
7/8 (0.8750)	0.895	0.852	1.719	1.719	0.469	0.438	0.496	0.438	0.895	0.865

Standard ASME B18.5 TABLE 6

Step Bolts

Dimensions in inches - source ASME B18.5 Table 6 Publication date: 2008
Nominal size or basic bolt Diameter	E		A		H		P		O
Nominal size or basic bolt Diameter	Max	Min	Max	Min	Max	Min	Max	Min	Max	Min
No.10 ( 0.1900)	0.199	0.182	0.469	0.438	0.114	0.094	0.125	0.094	0.199	0.185
1/4 (0.2500)	0.260	0.237	0.594	0.563	0.145	0.125	0.156	0.125	0.260	0.245
5/16 (0.3125)	0.324	0.298	0.719	0.688	0.176	0.156	0.187	0.156	0.324	0.307
3/8 (0.3750)	0.388	0.360	0.844	0.782	0.208	0.188	0.219	0.188	0.388	0.368
7/16 (0.4375)	0.452	0.421	0.969	0.907	0.239	0.219	0.250	0.219	0.452	0.431
1/2 (0.5000)	0.515	0.483	1.094	1.032	0.270	0.250	0.281	0.250	0.515	0.492
5/8 (0.6250)	0.642	0.605	1.344	1.219	0.344	0.313	0.344	0.313	0.642	0.616
3/4(0.7500)	0.768	0.729	1.594	1.469	0.406	0.375	0.406	0.375	0.768	0.741
7/8 (0.8750)	0.895	0.852	1.719	1.719	0.469	0.438	0.496	0.438	0.895	0.865

Standard ASME B18.5 TABLE 8

114 Degree Countersunk square neck bolts.

Dimensions in inches - source ASME B18.5 Table 8 Publication date: 2008
Nominal size or basic bolt Diameter	E		A		H		O		P		F
Nominal size or basic bolt Diameter	Max	Min	Max	Min	Max	Min	Max	Min	Max	Min	Min
No.10 ( 0.1900)	0.199	0.182	0.548	0.500	0.131	0.112	0.199	0.185	0.125	0.094	0.015
1/4 (0.2500)	0.260	0.237	0.682	0.625	0.154	0.135	0.260	0.245	0.156	0.125	.018
5/16 (0.3125)	0.324	0.298	0.821	0.750	0.184	0.159	0.324	0.307	0.219	0.188	0.023
3/8 (0.3750)	0.388	0.360	0.960	0.875	0.212	0.183	0.388	0.368	0.250	0.219	0.027
7/16 (0.4375)	0.452	0.421	1.093	1.000	0.235	0.205	0.452	0.431	0.281	0.250	0.030
1/2 (0.5000)	0.515	0.483	1.233	1.125	0.265	0.229	0.515	0.492	0.312	0.281	0.035
5/8 (0.6250)	0.642	0.605	1.495	1.375	0.316	0.272	0.642	0.616	0.406	0.375	0.038
3/4 (0.7500)	0.768	0.729	1.754	1.625	0.368	0.314	0.768	0.741	0.500	0.469	0.041

Standard ASME B18.5 TABLE 9

Flat countersunk head elevator bolts

Dimensions in inches - source ASME B18.5 Table 9 Publication date: 2008
Nominal size or basic bolt Diameter	E		A		H		Q	P		R	C
Nominal size or basic bolt Diameter	Max	Min	Max	Min	Max	Min	Max	Max	Min	Min	Ref
No.10 ( 0.1900)	0.199	0.182	0.790	0.750	0.082	0.062	0.031	0.125	0.094	0.031	9
1/4 (0.2500)	0.260	0.237	1.008	0.969	0.098	0.078	0.031	0.156	0.188	0.031	9
5/16 (0.3125)	0.324	0.298	1.227	1.188	0.114	0.061	0.031	0.219	0.219	0.031	9
3/8 (0.3750)	0.388	0.360	1.352	1.312	0.145	0.125	0.047	0.250	0.219	0.031	11
7/16 (0.4375)	0.452	0.421	1.477	1.438	0.176	0.156	0.047	0.281	0.250	0.031	13
1/2 (0.5000)	0.515	0.483	1.602	1.562	0.176	0.156	0.047	0.281	0.250	0.031	12

Standard ASME B18.5 TABLE 10

T-Head Bolts

Dimensions in inches - source ASME B18.5 Table 10 Publication date: 2008
Nominal size or basic bolt Diameter	E		A		B		H		K
Nominal size or basic bolt Diameter	Max	Min	Max	Min	Max	Min	Max	Min	Basic
1/4 (0.2500)	0.260	0.237	0.500	0.488	0.280	0.245	0.204	0.172	0.438
5/16 (0.3125)	0.324	0.298	0.625	0.609	0.342	0.307	0.267	0.233	0.500
3/8 (0.3750)	0.388	0.360	0.750	0.731	0.405	0.368	0.331	0.295	0.625
7/16 (0.4375)	0.452	0.421	0.875	0.853	0.468	0.431	0.394	0.356	0.875
1/2 (0.5000)	0.515	0.483	1.000	0.975	0.530	0.492	0.458	0.418	0.875
5/8 (0.6250)	0.642	0.605	1.250	1.218	0.675	0.616	0.585	0.541	1.062
3/4(0.7500)	0.768	0.729	1.500	1.462	0.800	0.741	0.649	0.601	1.250
7/8 (0.8750)	0.895	0.852	1.750	1.706	0.938	0.865	0.766	0.724	1.375

Standard ASME B18.5 TABLE 4

Round Head Ribbed Neck Bolts

Dimensions in inches - source ASME B18.5 Table 4 Publication date: 2008
Nominal size or basic bolt Diameter	E		A		H		O
Nominal size or basic bolt Diameter	Max	Min	Max	Min	Max	Min	Max	Min
No.10 ( 0.1900)	0.199	0.182	0.469	0.438	0.114	0.094	0.199	0.185
1/4 (0.2500)	0.260	0.237	0.594	0.563	0.145	0.125	0.260	0.245
5/16 (0.3125)	0.324	0.298	0.719	0.688	0.176	0.156	0.324	0.307
3/8 (0.3750)	0.388	0.360	0.844	0.782	0.208	0.188	0.388	0.368
7/16 (0.4375)	0.452	0.421	0.969	0.907	0.239	0.219	0.452	0.431
1/2 (0.5000)	0.515	0.483	1.094	1.032	0.270	0.250	0.515	0.492
5/8 (0.6250)	0.642	0.605	1.344	1.219	0.344	0.313	0.642	0.616
3/4(0.7500)	0.768	0.729	1.594	1.469	0.406	0.375	0.768	0.741
7/8 (0.8750)	0.895	0.852	1.719	1.719	0.469	0.438	0.895	0.865

Full list of Suppliers of Round head bolts, inch series

Listed below all types of round head screws and bolts covered by the standard ASME B18.5 and recognized as American National Standard.

Italy|Distributor

Buora d.p.u. S.r.l.

Founded in 1969, Buora D.P.U. is a distributor certified following ISO 9001.

The company offers the complete range of high strength fasteners, ready on stock, both coarse and fine pitches with metric and inch threads.

Distributor of prestigious brands such as UNBRAKO and NORD-LOCK, for Buora D.P.U. the service always comes first, therefore there is not minimum quantity required.

Germany|Distributor

Pfitzer Verbindungstechnik Gmbh

Distributor of inch sized fasteners, oil and gas fasteners and turned special screws

United Arab Emirates|Distributor

A...

Manufacturer of anchor bolts, square head bolts, carriage bolts and stud bolts

Thailand|Distributor

B...

Manufacturer of hex head screws, carriage bolts and socket cap screws

South Africa|Distributor

C...

Manufacturer of hexagon head bolts, plough bolts, CSK nibs bolts, cup square bolts and hexagon nuts

Taiwan|Distributor

C...

Manufacturer of cold forged fasteners for automotive.

Nominal Dia.: 1/4' (M6) - 1' (M24)

Lengths: 1/4' (12mm) - 12' (300mm)

Germany|Distributor

The portal for fasteners and fixing elements

Suppliers of Round head bolts, inch series

Technical data

Standard ASME B18.5 TABLE 7

Standard ASME B18.5 TABLE 1

Standard ASME B18.5 TABLE 5

Standard ASME B18.5 TABLE 2

Standard ASME B18.5 TABLE 3

Standard ASME B18.5 TABLE 6

Standard ASME B18.5 TABLE 8

Standard ASME B18.5 TABLE 9

Standard ASME B18.5 TABLE 10

Standard ASME B18.5 TABLE 4

Details

Buora d.p.u. S.r.l.

Pfitzer Verbindungstechnik Gmbh

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B...

C...

C...

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M...

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