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Machine Bolts

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Machine bolts, also known as cross arm bolts, are primarily used in pole line applications. These bolts feature square heads and a semi-cone point and are typically supplied with an assembled square nut. They are usually hot-dip galvanized to protect the steel from corrosion and ensure long-term durability.

At Baseline Bolts, we manufacture machine bolts in diameters up to 1-1/2″, in accordance with thread length guidelines commonly specified for pole line fasteners.

Machine Bolt Dimensions

 
Click to show drawing
Bolt DiameterDFCH
Body DiameterWidth Across FlatsWidth Across CornersHeight
MaxBasicMaxMinMaxMinBasicMaxMin
1⁄20.5153⁄40.7500.7251.0610.99521⁄640.3480.308
5⁄80.64215⁄160.9380.9061.3261.24427⁄640.4440.400
3⁄40.76811⁄81.1251.0881.5911.4941⁄20.5240.476
7⁄80.89515⁄161.3121.2691.8561.74219⁄320.6200.568
11.02211⁄21.5001.4502.1211.99121⁄320.6840.628
11⁄81.149111⁄161.6881.6312.3862.2393⁄40.7800.720
11⁄41.27717⁄81.8751.8122.6522.48927⁄320.8760.812
13⁄81.40421⁄162.0621.9942.9172.73829⁄320.9400.872
11⁄21.53121⁄42.2502.1753.1822.98611.0360.964
13⁄4* 29⁄16    13⁄16  
2* 215⁄16    15⁄16  

Dimensions per ASME B18.2.1 1996

* ASME only defines head dimensions up to 1-1/2″. Dimensions for 1-3/4 and 2″ are approximate and not covered under the ASME dimensional specifications.

 
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