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Suppliers of Socket head cap screws, inch series

This product is regulated by the following standards:

ASME B18.3 TABLE 1G ASME B18.3 TABLE 3 ASME B18.3 TABLE 1A ASME B18.3 TABLE 2A

Technical data

Standard ASME B18.3 TABLE 1G

Hexagon socket head cap screws with low head. This product, although a high-strenght precision fastener, is recommended for lighter fastening applications. It is not suggested for use in critical high-strenght applications where socket head cap screws should normally be used. They are designed to be used in applications where head height clearance is a problem. Because of their reduced head height and smaller socket size, they normally cannot be properly preloaded as a standard socket cap screw and should not be subjected to high dynamic loads.

 

 

Dimensions in inches - source ASME B18.3 table 1G - 2008- Low head Hex Socket Cap Screws
d basic thread size Nr of threads x inch A max H min D min T min J hex socket
inches mm UNC UNF
4 (0.1129 2.84 40 48 0.183 0.053 0.107 0.038 0.05
5 (0.125) 3.18 40 44 0.205 0.059 0.12 0.044 0.062
6 (0.138) 3.51 32 40 0.226 0.066 0.132 0.05 0.062
8 (0.164) 4.17 32 36 0.27 0.079 0.159 0.06 0.078
10 (0.19) 4.83 24 32 0.312 0.092 0.184 0.072 0.094
1/4 6.35 20 28 0.375 0.121 0.244 0.094 0.125
5/16 7.94 18 24 0.437 0.152 0.305 0.110 0.156
3/8 9.53 16 24 0.562 0.182 0.368 0.115 0.188
7/16 11.11 14 20 0.625 0.213 0.429 0.135 0.219
1/2 12.70 13 20 0.75 0.244 0.492 0.151 0.25
5/8 15.88 11 18 0.875 0.306 0.616 0.25 0.312
 
 

Standard ASME B18.3 TABLE 3

Hex and spline socket button head cap screws

 

Dimensions in inches - source ASME B18.3 table 3 - 2008 hex and spline socket button head cap screws
d basic thread size Nr of threads x inch A max H min L max standard T min J hex socket M spline socket
inches mm UNC UNF
0 (0.06) 1.52 - 80 0.114 0.026 0.5 0.02 0.035 0.048
1 (0.073) 1.85 64 72 0.139 0.033 0.5 0.028 0.05 0.06
2 (0.086) 2.18 56 64 0.164 0.046 0.5 0.028 0.05 0.06
3 (0.099) 2.51 48 56 0.188 0.052 0.5 0.035 0.062 0.072
4 (0.1129 2.84 40 48 0.213 0.059 0.5 0.035 0.062 0.072
5 (0.125) 3.18 40 44 0.238 0.066 0.5 0.044 0.078 0.096
6 (0.138) 3.51 32 40 0.262 0.073 0.63 0.044 0.078 0.096
8 (0.164) 4.17 32 36 0.312 0.087 0.750 0.052 0.094 0.111
10 (0.19) 4.83 24 32 0.361 0.101 1 0.07 0.125 0.145
1/4 6.35 20 28 0.437 0.132 1 0.087 0.156 0.183
5/16 7.94 18 24 0.547 0.166 1 0.105 0.188 0.216
3/8 9.53 16 24 0.656 0.199 1 0.122 0.219 0.251
1/2 12.70 13 20 0.875 0.265 2 0.175 0.312 0.372
5/8 15.88 11 18 1 0.331 2 0.21 0.375 0.454

Standard ASME B18.3 TABLE 1A

Hexagon socket head cap screws. The socket head shall have a flat chamfered top surface with smooth or knurled cylindrical sides and a flat bearing surface.

 

Dimensions in inches - source ASME B18.3 table 1A

Publication date: 2003
d basic thread size Nr of threads x inch dk max k max t min b min S
nom		 M nom
inches mm UNC UNF
0 1.52 - 80 0.096 0.060 0.025  0.5 0.05 0.06
N° 1 1.85 64 72 0.118 0.073 0.031  0.62 0.062 0.072
N° 2 2.18 56 64 0.140 0.086 0.038  0.62 0.078 0.096
N° 3 2.51 48 56 0.161 0.099 0.044  0.62 0.078 0.096
N° 4 2.84 40 48 0.183 0.112  0.051 0.75 0.094 0.111
N° 5 3.18 40 44 0.205 0.125 0.057  0.75 0.094 0.111
N° 6 3.51 32 40 0.226 0.138 0.064  0.75 0.109 0.133
N° 8 4.17 32 36 0.270 0.164 0.077  0.88 0.141 0.168
N° 10 4.83 24 32 0.312 0.190 0.090  0.88 0.156 0.183
1/4 6.35 20 28 0.375 0.250 0.120  1 0.188 0.216
5/16 7.94 18 24 0.469 0.312  0.151 1.12 0.25 0.291
3/8 9.53 16 24 0.562 0.375  0.182 1.25 0.312 0.372
7/16 11.11 14 20 0.656 0.438  0.213 1.38 0.375 0.454
1/2 12.70 13 20 0.750 0.5  0.245 1.5 0.375 0.454
5/8 15.88 11 18 0.938 0.625  0.307 1.75 0.5 0.595
3/4 19.05 10 16 1.125 0.750  0.370 2 0.625 0.620
7/8 22.23 9 14 1.312 0.875  0.432 2.25 0.75 0.698
1 25.40 8 12 1.5 1  0.495 2.5 0.75 0.790
1 1/8 28.58 7 12  1.687  1.125 0.557  2.81 0.875 -
1 1/4 31.75 7 12 1.875 1.250  0.620 3.12 0.875 -
1 3/8 34.93 6 12  2.062 1.375 0.682  3.44 1 -
1 1/2 38.10 6 12 2.25 1.5  0.745 3.75 1 -
1 3/4 28.58 5 -  2.625  1.75  0.870 4.38 1.25 -
2 34.93 4.5 -  3  2 0.995 5 1.5 -
2-1/4 38.10 4.5  - 3.375 2.25  1.20 5.62 1.75 -
2-1/2 63.50 4 - 3.75 2.5  1.245 6.25 1.75 -
2-3/4 69.85 4 - 4.125 2.75 1.370  6.88 2 -
3 76.20 4 - 4.5 3 1.495  7.5 2.25 -
3-1/4 82.55 4 - 4.875 3.25 1.620  8.12 2.25 -
3-1/2 88.90 4 - 5.25 3.5 1.745  8.75 2.75 -
3-3/4 95.25 4 - 5.625 3.75  1.870 9.38 2.75 -
4 101.6 4 - 6 4  1.995 10 3 -

Approx. mass, in kg x1000 pcs, (ρ=7,85 kg/dm3) -
d thread size 4-40 6-32 8-32 10-24 10-32 1/4 5/16 3/8 7/16 1/2 5/8 3/4
nominal length l                        
1/4 0,53 0,93 1,49 2,19 2,25              
5/16 0,58 1,01 1,61 2,36 2,43 4,37            
3/8 0,64 1,10 1,74 2,51 2,60 4,65 8,41          
7/16 0,70 1,19 1,87 2,68 2,78 4,95 8,88          
1/2 0,75 1,27 2,00 2,84 2,97 5,24 9,35 15,07        
5/8 0,87 1,45 2,26 3,18 3,32 5,81 10,29 16,43 24,45 36,13    
3/4 0,99 1,61 2,50 3,50 3,67 6,39 11,23 17,82 26,33 38,61 69,10  
7/8 1,10 1,78 2,76 3,83 4,03 6,97 12,18 19,18 28,21 41,11 73,06  
1 1,29 2,07 3,02 4,16 4,39 7,54 13,10 20,56 30,09 43,61 77,02  
1-1/4 1,51 2,53 3,74 5,15 5,36 8,70 14,97 23,31 33,86 48,60 84,91 135,22
1-1/2 1,89 2,87 4,26 5,81 6,07 10,60 16,83 26,03 37,62 53,59 92,85 146,84
1-3/4 2,12 3,45 5,05 6,91 7,11 11,75 20,02 30,23 41,40 58,58 100,77 158,46
2 2,49 3,79 5,56 7,56 7,82 13,65 21,89 32,98 47,52 63,55 108,69 170,07
2-1/4 2,72 4,38 6,36 8,66 8,86 14,81 24,75 36,92 51,28 69,59 116,61 181,68
2-1/2 3,10 4,71 6,87 9,32 9,57 16,71 26,73 39,90 56,95 74,56 129,75 193,33
2-3/4 3,33 5,30 7,66 10,41 10,62 17,87 29,60 44,08 60,71 79,56 137,67 204,91
3 3,70 5,63 8,17 11,08 11,33 19,77 31,48 46,82 66,37 85,55 145,59 225,84
3-1/4           20,89 34,38 51,01 70,15 90,55 158,75 237,48
3-1/2           22,83 36,25 53,75 75,83 95,53 166,67 249,06
3-3/4           23,98 39,17 57,93 79,59 101,53 174,59 260,67
4           25,88 41,04 60,68 85,23 106,51 187,76 281,60
4-1/4           27,03 43,95 64,84 88,99 111,51 165,98 293,21
4-1/2           28,94 45,83 67,61 94,68 117,50 203,60 304,82
4-3/4           30,09 48,75 71,78 93,49 122,50 216,79 316,45
5           31,99 50,62 74,54 104,10 127,50 224,71 337,36
5-1/4           33,15 53,55 78,70 107,90 133,48 232,63 348,98
5-1/2           35,05 55,44 81,47 113,54 138,49 245,80 360,60
5-3/4           36,21 58,34 85,63 117,30 143,47 253,71 372,21
6           38,21 60,21 88,37 122,97 149,48 261,63 393,13
6-1/4           39,27 63,12 92,56 126,71 154,46 274,80 404,77
6-1/2           41,18 66,03 95,30 132,40 159,45 282,72 416,36
6-3/4           42,32 67,92 99,49 136,16 165,43 290,64 447,78
7           44,22 69,79 102,22 141,85 170,42 303,80 448,92

Standard ASME B18.3 TABLE 2A

Socket Flat Countersunk Head Cap Screws. The flat countersunk head shall have a flat top sur-face and a conical bearing surface with included angle of approximately 82 deg.

 

 

Dimensions in inches  - ASME b18.3Table 2A - 2008- Socket Flat  Countersunk Head Cap Screws
d thread size Nr. of threads x inch d1 min b basic thread length  dk max theo.Sharp k max t min S nom M nom
inches mm UNC UNF
0 (0.06) 1.52 - 80 0.568 0.5 0.138 0.044 0.025 0.035 0.048
1 (0.073) 1.85 64 72 0.07 0.62 0.168 0.054 0.031 0.05 0.06
2 (0.086) 2.18 56 64 0.082 0.62 0.197 0.064 0.038 0.05 0.06
3 0.099) 2.51 48 56 0.095 0.62 0.226 0.073 0.044 0.062 0.072
4 (0.112) 2.84 40 48 0.108 0.75 0.255 0.083 0.055 0.062 0.072
5 (0.125) 3.18 40 44 0.12 0.75 0.281 0.90 0.061 0.078 0.096
6 (0.138) 3.51 32 40 0.133 0.75 0.307 0.097 0.066 0.078 0.096
8 (0.164) 4.17 32 36 0.159 0.875 0.359 0.112 0.076 0.094 0.111
10 (0.19) 4.83 24 32 0.184 0.875 0.411 0.127 0.087 0.125 0.145
1/4 6.35 20 28 0.244 1 0.531 0.161 0.111 0.156 0.183
5/16 7.94 18 24 0.305 1.125 0.656 0.198 0.135 0.188 0.216
3/8 9.53 16 24 0.368 1.25 0.781 0.234 0.159 0.219 0.251
7/16 11.11 14 20 0.429 1.375 0.844 0.234 0.159 0.25 0.291
1/2 12.70 13 20 0.492 1.5 0.938 0.251 0.172 0.312 0.372
5/8 15.88 11 18 0.616 1.75 1.188 0.324 0.220 0.375 0.454
3/4 19.05 10 16 0.741 2 1.438 0.396 0.220 0.5 0.454
7/8 22.23 9 14 0.865 2.25 1.688 0.468 0.248 0.562 -
1 25.40 8 12 0.989 2.5 1.938 0.540 0.297 0.625 -
1-1/8 28.58 7 12 1.108 2.81 2.188 0.611 0.325 0.75 -
1-1/4 31.75 7 12 1.233 3.12 2.438 0.683 0.358 0.875 -
1-3/8 34.93 6 12 1.357 3.44 2.688 0.755 0.402 0.875 -
1-1/2 38.10 6 12 1.482 3.75 2.938 0.827 0.435 1 -

Full list of Suppliers of Socket head cap screws, inch series

Italy

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.

Netherlands

Triofast BV

Distributor of standard and special fasteners.

The company supplies fasteners with various types of thread: UNC, UNF, BSW and BSF. The products meet standards such as ISO, DIN, ASTM, ANSI and BS.

Thailand

Bangkok Fastening Co. Ltd.

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

Italy

BULLONERIA BELLICINI srl

Manufacturer of hot forged fasteners and nip bolts, from M20 to M64

UK

Clyde Fasteners Limited

Manufacturer of socket screws and Tee Slot Bolts both metric and imperial

UK

Earnest Machine

Distributor of fasteners

Italy

FASTENAL EUROPE SRL

We offer logistics and inventory management and integrated supply chain management services covering a wide market of OEM fasteners (KanBan), MRO and Personal Protective Equipment (Vending Machine).

Taiwan

FkE FWU Kuang Enterprises LTD

One of the main producers of socket cap screws in haig tensile steels: 10.9 12.9 14.99

Germany

Fürniss GmbH

Distributor of aerospace fasteners

USA

Holo-Krome Company

Manufacturer of hex-socket screw in inch

Taiwan

JINN HER ENTERPRISE CO. LTD

Manufacturer of standard and special fasteners, from M4 to M30, from 1/4' to 1-1/4'.  Lengths from 10 to 300mm and from 1/2' to 12'.

UK

K-Engineering Co Ltd

Manufacturer of threaded items, mainly screwed rods, engineering studs, bright bolts and sets and special items according to customer specifications

USA

Kerr Lakeside Inc.

Manufacturer of socket cap screws both in metric and inch dimensions

Taiwan

Lih Ta Fasteners

Manufacturer of six-lobe screws, micro screws, screws for plastics and trilobular screws. Torx licensed, and other pantent drives and threads

India

MARUTI INTERNATIONAL

Manufacturer of screws, nuts, washers and threaded rods

Germany

Peter Schröder GmbH

Distributor specialized in inch thread fasteners

Germany

Pfitzer Verbindungstechnik Gmbh

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

Germany

ScrewCorner Fastener - Superstore

Distributor of inch fasteners as per British and American standards

China

SHANGHAI PRIME MACHINERY CO.LTD

One of the largest fasteners manufacturer and exporter in China.

Hexagon and socket screws, high strength hex bolts (ASTM GR5 and GR8, DIN and ISO CL.8.8 and 10.9)

The surface plating includes Black, Zinc Bright, Zinc Yellow, Hot Dip Galvanize, Dacromet, Geomet and others.

UK

Smith Bullough

Manufacturer of special cold and hot forged nuts and bolts: Metric, UNF, UNC, BSF & BSW (Whitworth) threadforms

 

UK

Socket & Allied Screws Ltd

Manufacturer of socket screws (Imperial No. 0 to 4' and Metric M2.5 to M100) and special bespoke fasteners

UK

Socketfast Ltd Boltfast Ltd

Importer and distributor of cap screws both in metric and imperial sizes.

USA

The Dyson Corporation

Manufacturer of inch bolts, nuts and stud bolts. Diameter from 3/4″ up to 26″ and lenghts from 1″ up to 36″

USA

The socket source Inc.

Distributor of socket screws, set screws and dowel pins. Inch sizes

Taiwan

TUZ Maudle Cor.

Manufacturer of socket screws inch and metric sizes, form M2 to M24

 

Thailand

Tycoons Worldwide Group

Manufacturer of drywall screws, selftapping, selfdrilling and machine screws, hex head and sockets, threaded rods. Metric and inch sizes

India

UNBRAKO - Deepak Fasteners Ltd.

Manufacturer of socket cap screws, shoulder screws, dowel pins, set screws, pression plugs, wrench keys

 

India

Uniloc Fasteners

Manufacturing and exports of High Tensile Automotive & Industrial Fasteners.

Our products also include stainless steel standards and specials, forged and machine parts.

Taiwan

YFS - Fang Sheng Screw CO. LTD.

One of the world''s largest manufactures of Alloy Steel Hexagon Socket Screws: Hex Socket Cap, Flat Head Sockets, Shoulder Screws, Button Head Sockets, Hex. Heads, Socket SET Screws.


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