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Hexagon head nut ASTM A563

ASTM A563 Heavy Hexagon nut

1/2''~1-1/8''
ASTM A563 Heavy Hexagon Nut is an inch-series heavy hex nut used with high-strength structural bolts like ASTM A325 and A490. It features a thicker body and wider bearing surface than standard hex nuts. Available in grades O, A, B, C, D, DH, and DH3 (weathering steel), it is commonly used in steel bridges, buildings, and industrial structures.
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Product Name：ASTM A563 Heavy Hexagon nut

 
Our ASTM A563 Heavy Hexagon nut is an inch-series structural nut featuring a thicker body and wider bearing surface than standard hex nuts, designed for high-strength bolting applications. The Hexagon head nut ASTM A563 is available in multiple grades including O, A, B, C, D, DH, and DH3 (weathering steel), with Grades DH and DH3 providing the highest strength for use with ASTM A490 bolts. As A563 Heavy hex nuts, they are commonly paired with ASTM A325 and A490 structural bolts in steel bridge construction, high-rise buildings, industrial plants, and heavy machinery. These nuts ensure proper load distribution and resistance against loosening under high preload. DH grade nuts offer minimum proof load of 175,000 psi for diameters 1/2"through 1-1/2".
 
                                                                                                                                                                                                
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