Finished Hex Bolts (Hex Head Cap Screws)

Finished hex bolts commonly referred to as hex head cap screws are threaded fasteners used to create reliable clamped joints in mechanical and structural assemblies. Their six-sided head allows installation with standard wrenches or sockets while providing consistent torque transfer during tightening.

A distinguishing feature of finished hex bolts is the washer-face bearing surface under the head, which helps distribute clamp load across the joint. These bolts also maintain a full body diameter through most of the shank, with thread length typically defined by dimensional standards such as ASME B18.2.1.

Finished hex bolts are commonly used in serviceable joints where assemblies may require disassembly for maintenance, adjustment, or repair.

Washer Face Bearing Surface

The washer face located beneath the bolt head provides a smooth bearing surface that distributes clamp load more evenly across the joint. This feature distinguishes finished hex bolts and hex head cap screws from other similar fasteners such as machine bolts or semi-finished hex bolts, which typically do not include a washer face.

The washer face also helps reduce localized surface damage to the joint material and improves the consistency of preload when the bolt is tightened.

Related Bolt Types

Several fasteners resemble finished hex bolts but differ in specific design details.

Hex Machine Bolts

Machine bolts resemble finished hex bolts but typically do not include a washer-face bearing surface under the head. Threads often extend closer to the head, and historically these bolts were used in lighter assemblies with nuts.

Semi-Finished Hex Bolts

Semi-finished hex bolts also lack the washer face found on finished hex bolts and may have less controlled head bearing surfaces. These bolts were historically used in structural or general hardware applications.

Tap Bolts

Tap bolts are fully threaded hex bolts designed to be installed into tapped holes rather than used with nuts. Because the threads extend nearly to the head, they do not maintain the full body diameter typical of finished hex bolts.

Square Machine Bolts

Square-head machine bolts occasionally appear in older equipment or specialty applications. Like hex machine bolts, they typically do not include a washer-face bearing surface and are generally used with nuts rather than in precision clamped joints.

How G-Fast Supports Hex Bolt Programs

G-Fast supplies finished hex bolts produced to customer specifications and recognized industry standards.

For applications requiring specific materials, finishes, or certification requirements, we review supplied drawings or specifications for manufacturability, feasibility, and cost efficiency before production begins. Any recommended changes are reviewed and approved by the customer’s engineering team and incorporated into updated documentation prior to manufacturing.