Square head machine bolts were the industry standard prior to hex bolts gaining prominence. Square bolts are now most commonly used for aesthetic purposes to provide a rustic look in a new structure or to match existing fasteners in an older structure. Square lag screws are also used for these purposes.
The Dale Company manufactures custom square bolts to meet your required specifications. Special tooling can be created to produce nonstandard head dimensions or bolt heads with your company's name and/or logo.
If you do find the size you are looking for from the chart below, please do not hesitate to call and we will custom manufacture a size that will fit your specific requirements.
Square Bend U-Bolt Dimensions
Size
(B x C) |
Thread Length
(D) |
5/16-18 (A) |
2 x 3 |
1-1/2 |
2 x 5 |
3 |
2 x 7 |
3 |
3/8-16 (A) |
3 x 4 |
2 |
3 x 6 |
3 |
3 x 7 |
3 |
4 x 3 |
1-1/2 |
4 x 5 |
3 |
4 x 6 |
3 |
Round Bend U-Bolt Dimensions
Size
(B x C) |
Thread Length
(D) |
Fits Pipe Size |
1/4-20 (A) |
9/16 |
x |
1-3/8 |
3/4 |
1/4 |
3/4 |
x |
1-1/4 |
3/4 |
3/8 |
3/4 |
x |
1-3/4 |
1 |
3/8 |
3/4 |
x |
2-3/4 |
2 |
3/8 |
3/4 |
x |
4-3/4 |
4 |
3/8 |
1 |
x |
1-3/4 |
1 |
1/2 |
1-1/8 |
x |
2-1/4 |
1-1/4 |
3/4 |
1-1/8 |
x |
3-1/2 |
2-3/4 |
3/4 |
1-3/8 |
x |
2-3/4 |
1-3/4 |
1 |
1-3/4 |
x |
2-3/4 |
1-1/4 |
1-1/4 |
2 |
x |
3-1/2 |
1-3/4 |
1-1/2 |
5/16-18 (A) |
1-3/8 |
x |
2-1/2 |
1-1/4 |
1 |
1-3/8 |
x |
3-3/4 |
2-1/8 |
1 |
1-3/4 |
x |
3 |
1-1/2 |
1-1/4 |
1-3/4 |
x |
4-1/4 |
2-1/2 |
1-1/4 |
2 |
x |
3-1/4 |
1-1/2 |
1-1/2 |
2 |
x |
3-11/16 |
2 |
1-1/2 |
2 |
x |
4-11/16 |
2-3/4 |
1-1/2 |
2-1/2 |
x |
3-1/2 |
1-1/2 |
2 |
2-1/2 |
x |
4-3/16 |
2-1/4 |
2 |
2-1/2 |
x |
5-3/16 |
3 |
2 |
3/8-16 (A) |
2 |
x |
3-1/8 |
1-1/2 |
1-1/2 |
2-1/2 |
x |
3-5/8 |
1-3/4 |
2 |
3 |
x |
4-1/8 |
1-3/4 |
2-1/2 |
3-1/2 |
x |
4-5/8 |
2 |
3 |
3-1/2 |
x |
6-1/2 |
3 |
3 |
1/2-13 (A) |
3 |
x |
5 |
2-1/2 |
2-1/2 |
3-1/2 |
x |
5-1/2 |
2-1/2 |
3 |
4 |
x |
6 |
2-1/2 |
3-1/2 |
4-1/2 |
x |
6-1/2 |
2-1/2 |
4 |
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