NUT SIZE CHARTS
Complete dimensional specifications for US and metric nuts — hex nuts, jam nuts, lock nuts, and flange nuts with detailed measurements and tolerances
Accurate Nut Sizing Reference
Our comprehensive nut size charts provide precise dimensions for all common nut types in both US standard and metric measurements. Each chart includes thread sizes, across-flat dimensions, thickness specifications, and tolerance ranges to ensure proper fitment for your fastening applications.
US Standard Nut Size Charts
Dimensional specifications for imperial thread nuts including hex, jam, lock, and flange styles
US Serrated Flange Nuts
Complete sizing for serrated flange lock nuts including flange diameter, nut height, and across-flat measurements for #6 through 3/4" sizes.
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US Nylon Insert Lock Nuts
Dimensional specifications for nylon insert lock nuts (nylock nuts) with thread sizes from #4-40 to 1"-8, including hex width and nut thickness.
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US Hex Jam Nuts
Low-profile jam nut dimensions covering sizes #4-40 through 1"-8 with across-flat measurements and reduced thickness specifications for locking applications.
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US Machine Screw Hex Nuts
Precision dimensions for machine screw hex nuts from #0-80 to #12-24 threads, ideal for small diameter fastening with exact width and height tolerances.
Download PDF Chart →Metric Nut Size Charts
Complete metric specifications for hex nuts, jam nuts, and flange nuts with ISO standard dimensions
Metric Serrated Flange Nuts
ISO metric flange nut dimensions from M3 to M16 including flange outer diameter, nut height, and across-flat measurements with serrated locking features.
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Metric Hex Jam Nuts
Low-profile metric jam nut specifications covering M2 through M20 thread sizes with reduced height dimensions for lock nut applications and tight spacing.
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Metric Hex Nuts
Standard metric hex nut dimensions from M1.6 to M24 with full across-flat, across-corner, and thickness specifications conforming to DIN 934 and ISO 4032 standards.
Download PDF Chart →How to Use These Charts
1. Identify Thread Size
Determine your bolt or screw thread size (e.g., 1/4"-20 or M6) to find the corresponding nut specifications.
2. Check Dimensions
Verify across-flat measurements for proper wrench size and nut height for adequate thread engagement.
3. Select Nut Type
Choose between standard hex, jam, lock, or flange nuts based on your application requirements and space constraints.
Need Help Selecting the Right Nut?
Our fastener experts can help you choose the perfect nut type and size for your specific application. Contact us for personalized recommendations.