US Nut Size Table

US Nut Size Table

Thread Source carries a wide variety of fasteners including many different types of nuts. Check out our online reference tables showing hex nut dimensions and heavy hex nut dimensions and browse our catalog for specifications and information on specific types of nuts.

  • Hex Nut
    • A standard six sided nut.
  • Machine Nut
    • A hex nut in smaller sizes for machine screw diameters under 1/4.
  • Jam Nut
    • A thinner version of a hex nut.
  • Nylock Nut
    • A hex nut with a nylon ring to resist loosening.
Size Diam.* Height
Hex Nut Machine Screw Nut Hex Nut Jam Nut Nylock Nut Machine Screw Nut
0 5/32 3/64
1 5/32 3/64
2 3/16 9/64 1/16
3 3/16 9/64 1/16
4 1/4 9/64 3/32
6 5/16 11/64 7/64
8 11/32 15/64 1/8
10 3/8 15/64 1/8
12 7/16 5/16 5/32
1/4 7/16 7/16 7/32 5/32 5/16 3/16
5/16 1/2 9/16 17/64 3/16 11/32 7/32
3/8 9/16 5/8 21/64 7/32 29/64 1/4
7/16 11/16 3/8 1/4 29/64
1/2 3/4 7/16 5/16 19/32
9/16 7/8 31/64 5/16 41/64
5/8 15/16 35/64 3/8 3/4
3/4 1-1/8 41/64 27/64 7/8
7/8 1-5/16 3/4 31/64 63/64
1 1-1/2 55/64 35/64 1-3/64
* This is the diameter across the flats. It is also the size of wrench to use.

Nuts

  • Hot

    Finished Hex Nuts – Grade 8: Yellow Zinc

    Grade 8 hex nuts have internal machine threads, for use with machine thread bolts and screws. Yellow Zinc offers a modest amount of corrosion resistance, slightly higher than that of clear zinc.

  • Hot

    Finished Hex Nuts – Grade 5

    Grade 5 hex nuts have internal machine threads, for use with machine thread bolts and screws. The most versatile and widely used nut. ANSI B1.1 UNC and UNF Class 2B thread requirement.  Zinc plating, retards the corrosion rate in a normal atmosphere.

  • Hot

    Finished Hex Nuts – Grade 2

    Hex nuts have internal machine threads, for use with machine thread bolts and screws. Grade 2: made of low carbon steel, these fasteners are applicable for most low strength commercial and industrial uses.

  • Hot

    Finished Hex Nuts – Stainless Steel

    Stainless steel hex nuts have internal machine threads, for use with machine thread bolts and screws. Stainless steel is a versatile material offering corrosion resistance, strength, good pricing, and a wide range of shapes.

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