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Square Nuts have always been considered safest to use by utility line workers because of their large wrenching surface.  Regular nuts are used on all types of threaded bolts and insulator pins, while heavy nuts are used exclusively on anchor rods.

MacLean Power Square Nuts are manufactured in accordance with American National Standards Institute Specifications B18.2.2 and tapped Unified National Coarse Threads Series Class 2B after centrifugal hot dip galvanizing, oversize for galvanized bolts and rods.

Improved corrosion resistant options are available!

Better: TDG coated items


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Regular Square

Catalog Number Weight/100 (lbs) Nominal Size Bolt
J8561 2.2 3/8"
J8562 5.4 1/2"
J8563 10.2 5/8"
J8564 13.8 3/4"
J8564-1/2 24.3 7/8"

Heavy Square Nuts for Anchor Rods Only

Catalog Number Nominal Anchor Rod Dia. (Inches) Weight/100 (lbs) Nominal Anchor Rod Dia. Inches (cm) Weight/ 100 lbs (kg)
J8563-1 5/8 12.2 5/8 (1.6) 12.2 (5.5)
J8564-1 3/4 20.8 3/4 (1.9) 20.8 (9.4)
J8565-1 1 50.0 1 (2.5) 50.0 (22.7)

TDG Square Dim Drawing Image

Table below are items protected with zinc applied by the Thermal Diffusion Galvanizing (TDG) process (reference ASTM A 1059). Corrosion protection and service life for TDG items is greater than that provided by standard hot dip galvanizing. 

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TDG Square

Catalog Number Nominal Size Bolt Weight/100 (lbs)
J8564T 3/4" 12.4
J8563T 5/8" 10.2

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