Extra Thick Mil-Carb (MCx®)

For use with high strength ASTM A325 and A490, as well as Grade 8 bolts.

Fabricated from prime quality medium carbon steel. Through hardened (quenched and tempered) R/C 38-45, and electro zinc-yellow plated.

MCx® washers are available in 1/4″ through 1″ bolt sizes in U.S. Standard washer dimensions and SAE washer dimensions.

U.S Standard Dimensions

Bolt SizeOutside DiameterInside DiameterThicknessApprox Lbs per M PcsApprox Pcs per Carton
1/4.750.313.090/.11010.73,700
5/16.875.375.090/.11013.92,800
3/81.000.438.110/.12620.51,900
7/161.250.500.100/.126341,100
1/21.375.563.156/.18863600
9/161.500.625.156/.18872500
5/81.750.688.170/.195107350
3/42.000.813.170/.195138250
7/82.250.938.235/.265233150
12.5001.063.235/.265285130

S.A.E Dimensions

Bolt SizeOutside DiameterInside DiameterThicknessApprox Lbs per M PcsApprox Pcs per Carton
1/4.625.281.090/.11075,700
5/16.688.344.090/.1107.95,000
3/8.813.406.110/.12612.83,100
7/16.922.469.110/.12616.32,400
1/21.063.531.156/.188331,000
9/161.188.594.156/.18841900
5/81.313.656.170/.19554700
3/41.469.813.170/.19562600
7/81.750.938.235/.265122300
12.0001.063.235/.265160200