Machine Screw Nuts | McMaster-Carr

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3,411 Products

Hex Nuts

Standard Profile About Standard Profile

Hex Nuts

The most common hex nuts for fastening machinery and equipment

1,446 products

Mil. Spec. Hex Nuts

Meet strict U.S. military standards for material and construction

78 products

Hex Nuts for High-Pressure Applications

Fasten ASTM A193 screws on pressure tanks, boilers, and heat exchangers

6 products

JIS Hex Nuts

Fasten parts and components that are made to Japanese Industrial Standards

28 products

Left-Hand-Thread Hex Nuts

Tighten when turned to the left to prevent counterclockwise-moving parts from loosening

149 products

Hex Nut Assortments

A range of sizes to fasten a variety of parts

5 products

Thin Profile About Thin Profile

Thin-Profile Hex Nuts

About half the height of standard nuts to fit in spaces with low clearance

603 products

Mil. Spec. Thin-Profile Hex Nuts

Meet strict U.S. military standards for material and construction

12 products

Left-Hand-Thread Thin-Profile Hex Nuts

Tighten when turned to the left to prevent counterclockwise-moving parts from loosening

208 products

Heavy Profile About Heavy Profile

Heavy-Profile Hex Nuts

About 10% wider and taller than standard nuts to handle heavier loads

253 products

Heavy-Profile Hex Nuts for High-Pressure Applications

Secure ASTM A193 screws and are wider and taller than standard nuts to handle heavier loads

61 products

Structural Heavy-Profile Hex Nuts

Secure ASTM A325 screws in structural joints, such as I-beams, columns, and joists

44 products

Left-Hand-Thread Heavy-Profile Hex Nuts

Tighten when turned to the left to prevent counterclockwise-moving parts from loosening

6 products

High Profile About High Profile

High-Profile Hex Nuts

Larger gripping area keeps wrenches from slipping off as you tighten

33 products

Thin-Heavy Profile About Thin-Heavy Profile

Thin-Heavy-Profile Hex Nuts

Fit in low-clearance spaces and handle heavier loads than standard nuts

68 products

Narrow Profile About Narrow Profile

Narrow-Profile Hex Nuts

20% narrower than other nuts to fit in cramped spaces

65 products

Mil. Spec. Narrow-Profile Hex Nuts

Meet strict U.S. military standards for material and construction

6 products

Other Products

Locknuts

Hold fasteners in place to prevent loosening from vibration

82 products

Square Nuts

Flat sides won’t spin in channels and square holes

150 products

Slotted Round Nuts

Fasten with a screwdriver in tight spots where there's no room for a wrench

7 products

Turnbuckles

Twist the body or end fittings to adjust the length and tension of attached rope and chain

100 products