Machine Screw Nuts

Machine screw nuts are a type of nut that has flat tops, chamfered corners, and Unified Standard, Class 2B threads. Small pattern hex machine screw nuts are similar in design to standard hex machine screw nuts, but have smaller widths across the flats and across the corners. 

Frequently Asked Questions About Machine Screw Nuts

What are machine screw nuts used for?

Machine screw nuts are designed to be used in tighter areas where space is limited for wrenching, such as circuit boards or precision instruments. 

What types of screws are used with machine screw nuts? 

Machine screws are designed to be used with machine screw nuts, specifically with small diameter machine screws. 

What is the difference between a machine screw nut and a standard hex nut? 

Machine screw nuts are typically notably thinner than standard hex nuts. 

What sizes do machine screw nuts come in?

AFT offers machine screws nuts in diameter-thread sizes ranging from #0-80 to 3/8”-24. 

What materials and finishes do machine screw nuts come in? 

AFT offers machine screw nuts made of steel, stainless steel, brass, silicon bronze, or aluminum. They come in either a plain, zinc Cr+3, or black oxide finish. Stainless steel or a zinc finish are recommended for environments where extra corrosion resistance is needed.