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Jiangsu Zhenya Special Screw Co.,Ltd is one of the leading China square head bolts manufacturers and suppliers, as a professional company, our productive factory is able to produce CE certification square head bolts at both high quality and low price. Welcome to buy discount and cheap, or wholesale products from us.
Square Head Bolts offer a large bearing area for positive gripping with an open or adjustable wrench. Length is measured from under the head. Head width or wrench size is measured across the flats. Plain finish, or bare metal, may or may not have a coating of light oil to resist corrosion
Square Head Bolts,
The information below lists the required dimensional, chemical and physical characteristics of the fasteners in this purchase order. If the order received does not meet these requirements, it may result in a supplier corrective action request, which could jeopardize your status as an approved vendor. Unless otherwise specified, all referenced consensus standards must be adhered to in their entirety.
Nomial Size or Basic Product Diameter |
E | F | H | R | LT | ||||||||
| Full-Size Body Diameter | Width Across Flats | Head Height | Radius of Fillet | Thread Length for Bolts Lengths |
|||||||||
| 6 in. and Shorter | Over 6 in. | ||||||||||||
Max |
Min |
Basic |
Max |
Min |
Basic | Max | Min |
Max |
Min |
Nom |
|||
1/4 |
0.2500 |
0.260 |
0.237 |
3/8 | 0.375 | 0.362 | 11/64 | 0.188 |
0.156 |
0.03 |
0.01 |
0.750 |
1.000 |
5/16 |
0.3125 |
0.324 |
0.298 |
1/2 | 0.500 |
0.484 |
13/64 |
0.220 | 0.186 |
0.875 |
1.125 |
||
| 38 | 0.3750 |
0.388 |
0.360 |
9/16 | 0.562 |
0.544 |
1/4 |
0.268 |
0.323 |
1.000 |
1.250 |
||
7/16 |
0.4375 |
0.452 |
0.421 |
5/8 | 0.625 |
0.603 |
19/64 |
0.316 |
0.278 |
1.125 |
1.375 |
||
1/2 |
0.5000 |
0.515 |
0.482 |
3/4 | 0.750 |
0.725 | 21/64 |
0.348 |
0.308 |
1.250 |
1.500 | ||
5/8 |
0.6250 |
0.642 |
0.605 |
15/16 | 0.938 |
0.906 | 27/64 |
0.444 |
0.400 |
0.06 |
0.02 |
1.500 |
1.750 |
3/4 |
0.7500 |
0.768 |
0.729 |
1-1/8 |
1.125 |
1.088 | 1/2 |
0.524 |
0.476 |
1.750 |
2.000 | ||
7/8 |
0.8750 |
0.895 |
0.852 |
1-5/16 |
1.312 |
1.269 |
19/32 |
0.620 | 0.568 |
2.000 |
2.250 |
||
| 1 | 1.0000 |
1.022 |
0.976 |
1-1/2 |
1.500 |
1.450 |
21/32 |
0.684 |
0.628 |
0.09 |
0.03 |
2.250 |
2.500 |
| 1-1/8 | 1.1250 |
1.149 |
1.098 |
1-11/16 |
1.688 |
1.631 |
3/4 |
0.780 | 0.720 |
2.500 |
2.750 |
||
| 1-1/4 | 1.2500 |
1.277 |
1.223 |
1-7/8 |
1.875 |
1.812 | 27/32 |
0.876 |
0.812 |
2.750 |
3.000 | ||
| 1-3/8 | 1.3750 |
1.404 |
1.345 |
2-1/16 |
2.062 |
1.994 | 29/32 |
0.940 | 0.872 |
3.000 |
3.250 | ||
| 1-1/2 | 1.5000 |
1.531 |
1.470 |
2-1/4 |
2.250 |
2.175 | 1 | 1.036 |
0.964 |
3.250 |
3.500 | ||
Specification Requirements:
Dimensions: ASME B18.2.1
Material &Mechanical Properties: ASTM A307, Grade A
Thread Requirements: ASME B1.1, UNC & UNF, Class 2A
Finish:Light Protective Oil
Head Marking: Manufacturer ID and 307A
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