Flange Nuts

A flange nut is a fastener with a threaded hole and a flange fitted at the bottom. This type of hardware is used in machine building, equipment manufacturing, furniture making and construction.

Purpose

Hexagon flange nuts are used to create strong threaded connections with bolts, screws and studs. When tightening a hexagon nut, a washer is normally used. Failure to follow this rule can result in the sharp edges of the fastener damaging the surface.

Using flange fasteners eliminates the need for a washer. Thanks to the increased diameter, the fastener exerts less pressure on the part’s surface during installation. This protects the surface of the product from damage.

Manufacturing standards

Requirements are set out in GOST 50 595-93 and DIN 6923. The standards specify requirements for the following parameters of the products:

• Material. The hardware is made of carbon steel, stainless steel and brass. Steel parts may be zinc-plated. This is necessary to ensure resistance to the harmful effects of moisture.
• Thread diameter. Manufacturers produce fasteners with a thread diameter of M3–M20. The thread pitch can range from 0.5 to 2.5 mm. M6, M8 and M10 are the most common.
• Flange diameter. This parameter depends on the size of the fastener and ranges from 8 to 42.8 mm.
• Maximum width across flats. This value ranges from 5.5 to 30 mm.
• Height across flats — from 1.6 to 11.1 mm.

In addition to the above, the standard also specifies the weight of the products. Compliance with the standards allows the fastener to be used to create a reliable connection resistant to self-loosening. Before buying a part, several parameters are considered at once: the width across flats, the height, the thread diameter and the diameter of the product itself.