Home > Products > Headed Bolts > Machine Bolts
Cross arm bolt default image
Cross Arm Bolt View 1 Cross Arm Bolt Drawing Click to enlarge images
Get a quick quote!

Machine Bolts - Crossarm Bolts

Machine bolts with a square head are a standard for the electrical utility industry. Also referred to as crossarm bolts they are used for fastening pole line hardware and electrical distribution equipment to wooden crossarms, poles, and other structures. These bolts meet the requirements of IEEE C135.1-1999 and ANSI B18.2.1.

Since all manufacturing processes are completed in-house, including hot-dip galvanizing, quick delivery is standard. There is no need to wait for overseas suppliers. Portland Bolt works directly with Public Utility Districts (PUD), electrical distributors, and others involved with the industry to provide the best service possible.

MANUFACTURING

Portland Bolt manufactures machine bolts in diameters from 1/2" through 1-1/4". Larger diameters are available up to 2-1/2", but are generally supplied without a semi-cone point as a square head or hex head machine bolt.

AVAILABLE

Common diameters manufactured include 1/2", 5/8", 3/4", 7/8" and 1". The advantage of machine bolts from Portland Bolt is our ablity to deliver quickly. Depending on your requirements, we ship custom machine bolts in less than two weeks.

STANDARD THREAD LENGTHS

Bolt lengths 4" up to but less than 8": Minimum thread length - 3" excluding point
Bolt lengths 8" up to but less than 12": Minimum thread length - 4" excluding point
Bolt lengths 12" and over: Minimum thread length - 6" excluding point

SEMI-CONE POINT

Machine bolts require a semi-cone point added beyond the last thread. The angle of the point is approximately 60 degrees and adds 1/2 the length of the diameter.

SQUARE NUTS

Nuts are supplied assembled as requested.

Bolt Diameter D F C H
Body Diameter Width Across Flats Width Across Corners Height
Max Basic Max Min Max Min Basic Max Min
3/8 0.388 9/16 0.562 0.544 0.795 0.747 1/4 0.268 0.232
1/2 0.515 3/4 0.750 0.725 1.061 0.995 21/64 0.348 0.308
5/8 0.642 15/16 0.938 0.906 1.326 1.244 27/64 0.444 0.400
3/4 0.768 1-1/8 1.125 1.088 1.591 1.494 1/2 0.524 0.476
7/8 0.895 1-5/16 1.312 1.269 1.856 1.742 19/32 0.620 0.568
1 1.022 1-1/2 1.500 1.450 2.121 1.991 21/32 0.684 0.628
1-1/8 1.149 1-11/16 1.688 1.631 2.386 2.239 3/4 0.780 0.720
1-1/4 1.277 1-7/8 1.875 1.812 2.652 2.489 27/32 0.876 0.812

Dimensions per ASME B18.2.1 1996