Case-Hardened Nuts | McMaster-Carr

Also known as collar nuts, these metric nuts have a flange that distributes pressure across the surface, so you don't need a washer. Made of high-strength Class 10 steel, they’re about 25% stronger than medium-strength steel flange nuts.

JIS High-Strength Steel Flange Nuts

These metric nuts meet JIS (Japanese Industrial Standard) B 1190.

Low-Strength Steel Flange Nuts

About half the strength of medium-strength steel flange nuts, use these nuts in light duty fastening applications, such as securing access panels.

Metric Low-Strength Steel Flange Nuts

About half the strength of medium-strength steel flange nuts, use these metric nuts in light duty fastening applications, such as securing access panels.

Medium-Strength Steel Flange Nuts

These Grade 5 flange nuts are suitable for fastening most machinery and equipment.

JIS Medium-Strength Steel Flange Nuts

Made to Japanese Industrial Standards, these nuts fasten most Japanese machinery and equipment without a washer.

Rotating Flange Nuts

The nut head rotates while the flange remains stationary to prevent scratching the material surface as you tighten the nut.

Steel Leveling Flange Nuts

These flange nuts have a black-oxide finish for mild corrosion resistance in dry environments.

Low-Strength Steel Thin Hex Nuts

These nuts should be used for light duty fastening applications, such as securing access panels.

Low-Strength Steel Extra-Wide Thin Hex Nuts

Use these nuts for light duty fastening applications, such as securing access panels.

Low-Strength Steel Coupling Nuts

About half the strength of medium-strength steel coupling nuts, these nuts are for light duty fastening applications.

Metric Low-Strength Steel Coupling Nuts

For light duty applications, choose these metric-sized coupling nuts.

Steel High-Torque Low-Profile Thumb Nuts

These nuts have a black-oxide finish for mild corrosion resistance in dry environments.

Low-Profile Thumb Nuts

Use these thumb nuts in low-clearance applications or jam one against another nut to hold it in place.

Steel Extra-Wide High-Hex Cap Nuts

Known for their strength, these steel cap nuts have a black-oxide finish to resist corrosion in dry environments.

Flanged Push-Button Slide-Adjust Nuts

A flange distributes the load over a large area and reduces stress where the nut meets the material surface.

Knurled Push-Button Slide-Adjust Nuts

Knurls provide a slip-resistant surface for controlled adjustment.

Hex Push-Button Slide-Adjust Nuts

These nuts can be tightened with a wrench once positioned by hand.

T-Slot Nuts

Designed to slide into T-slot tracks on machine tool tables, use these nuts to secure clamps and workpieces.

Drop-In T-Slot Nuts

Install from the top of the T-slot track and secure with a quarter turn. Also known as quarter-turn T-slot nuts.