ASME B18.2.2 Table 9 Heavy Square Nuts

ASME B18.2.2 Table 9 specifies heavy square nuts with increased thickness and larger width across flats compared to standard square nuts. This heavy-duty design provides enhanced thread engagement and greater load-carrying capacity for demanding applications requiring superior strength and reliability.

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Product introduction

Common Specifications

Materials	Carbon steel
Class	A563 Grade A, C, DH
Range	1/4″- 4″
Thread	UNC, UNF
Surface	Plain, zinc plated, hot-dip galvanized, GEOMET, ZINC-NICKLE, DACROMATE etc.

ASME B1822 Table 9

Key Features

Increased thickness for enhanced strength
Larger width across flats for reduced bearing pressure
Heavy-duty configuration for demanding applications
Conforms to ASME B18.2.2 Table 9
Available in high-strength grades

Heavy square nut

Application industry

Heavy equipment manufacturing
Structural steel connections
Mining and off-highway vehicles
Railroad track and infrastructure

data table

Size	1/4	5/16	3/8	7/16	1/2	5/8	3/4	7/8	1	1-1/8	1-1/4	1-3/8	1-1/2
UNC	20	18	16	14	13	11	10	9	8	7	7	6	6
s Min (inch)	0.488	0.546	0.669	0.728	0.850	1.031	1.212	1.394	1.575	1.756	1.938	2.119	2.300
s Max (inch)	0.500	0.562	0.688	0.750	0.875	1.062	1.250	1.438	1.625	1.812	2.000	2.188	2.375
e Min (inch)	0.640	0.720	0.889	0.970	1.137	1.386	1.635	1.884	2.132	2.381	2.631	2.879	3.128
e Max (inch)	0.707	0.795	0.973	1.060	1.237	1.503	1.768	2.033	2.298	2.563	2.828	3.094	3.359
m Min (inch)	0.218	0.280	0.341	0.403	0.464	0.587	0.710	0.833	0.956	1.079	1.187	1.310	1.433
m Max (inch)	0.266	0.330	0.393	0.456	0.520	0.647	0.774	0.901	1.028	1.155	1.282	1.409	1.536

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