Zinc Plated Steel UNF Bolts, Nuts and Washers

Also known as an Allen screw or Allen bolt, or simply a cap screw, socket head cap screws are a more modern alternative standard machine fastener to the standard hexagon headed bolt or setscrew, as found on much modern machinery. A hex key (otherwise known as an Allen key) is required to fit these fasteners. Conforming to ASME/ANSI B18.3, the contact surfaces of this screw or bolt are protected from external damage. Generally manufactured with a partial thread beyond a certain length and nominal diameter combination, but occasionally some stock may include a fully threaded shank.

A countersunk headed screw conforming with ASME/ANSI B18.3, requiring a hex key (otherwise known as an Allen key) to fit. The countersunk head is typically used in conjunction with a countersunk hole providing a flush, snag free fit. Generally manufactured with a full thread, though occasionally some stock may include a partially threaded shank.

A popular and attractive socket head screw, typically used where aesthetics are important, or where a lower profile domed finish is required. The hex drive is generally smaller than other hex driven ranges and thus the ultimate tightening torque is reduced. Manufactured to ASME/ANSI B18.3, and always fully threaded.

Also known as an Allen set screw, these headless types of screws have many uses. This particular type has a hex socket drive, and a depression called a cup on the opposite end, and conforms to ASME/ANSI B18.3.

Hexagon full nut to ASME B18.6.3. Typically fitted with a spanner or ratchet with socket. The most popular nut type, and used for decades on all types of assembly throughout the world.

Hexagon Machine Screw Nuts (UNF - Unified Fine Pitch) imported from the USA. These nuts generally have smaller internal diameters than the range available in standard hexagon nuts, so fit the smaller gauge sizes for Imperial screws. They also tend to be thinner or lower in height but have a larger outer diameter. These are specifically designed to be used in conjunction with other UNF screws or bolts. Often used in small electrical goods manufacturing, such as computers and hifi systems.

Prevailing torque type nut manufactured to IFI-100/107. Popularly employed Hexagon nut incorporating a nylon insert to help prevent loosening when fitted. Typically fitted with a spanner or ratchet with socket.

Prevailing torque nut, thin type. Popularly employed Hexagon nut incorporating a nylon insert to help prevent loosening when fitted. Typically fitted with a spanner or ratchet with socket.

Nut conforming to ASME B18.2.2. Also known as a half nut, thin nut, or jam nut. Typically fitted with a spanner or ratchet with socket, often used in pairs in a nut locking arrangement. A popular nut type, and used for decades on all types of assembly throughout the world.

An hexagon nut with incorporated flange. The flange offers protection for the bolted component where the driving tool may otherwise scratch it's surface. The flange also lessens the need to use a washer. This particular version has serrations on the base.

Popularly employed where frequent hand tightening and untightening of joints is required. To ASME B18.6.9.

Also known as a penny or repair washer, this very popular type offers a large external diameter; it is therefore able to spread the load of the joint over a wider area. This is a useful feature when working with softer materials. Dimensions shown are approximate. Please note that hole clearances can be generous on these washers.

Flat washer to American SAE specifications, now part of the Unified Thread Standard. Washers with a smaller external diameter than that of an equivalent USS washer. Conforms to ASME B18.21.1-1999.

Flat washer to American USS specifications, now part of the Unified Thread Standard. Washers with an external diameter larger than that of an equivalent SAE washer, but smaller than a penny/fender washer. Conforms to ASME B18.21.1-1999.

Spring washer designed to help prevent loosening of bolted joints under vibration. Also know as a Split Lock Washer and a Split Ring Washer. This type has a rectangular section and is manufactured to ASME B18.21.1-1999. Where even distribution of load on the mating surface is the primary requirement an alternative spring washer or a flat washer would be a more suitable solution. In addition Spring Washers do not offer protection for the material being fastened.

A toothed or perforated washer usually employed in electrical connections such as battery terminals, but can also be used in assemblies to help prevent loosening. This variant includes teeth on the external diameter. Produced to ASME B18.21.1.