Value Collection 33603 Hex Socket Cap Screw 1/4-20 Unc

Product Description

The VALUE COLLECTION 33603 is a hex socket cap screw designed for secure fastening in mechanical assemblies, structural connections, and equipment maintenance applications. Threaded 1/4-20 UNC and fully threaded along its 7/8-inch length under head, this fastener delivers consistent clamping force across its entire shaft. It is driven with a 3/16-inch hex key. Constructed from alloy steel with a black oxide finish coating, it offers improved corrosion resistance compared to uncoated steel and is suited for controlled-environment industrial and commercial use. Machinists, millwrights, and maintenance technicians working on HVAC equipment, pump assemblies, and general mechanical systems reach for this fastener class regularly.

This screw is appropriate for both original installation and replacement fastening in residential and commercial mechanical systems. Its 1/4-20 UNC thread form is one of the most common coarse-thread standards in North American equipment manufacturing, making it a frequent replacement choice in HVAC unit assembly, motor mounting, panel attachment, and similar trade-service scenarios. Fully threaded construction makes it well suited to thin-material clamping and through-bolt applications where thread engagement along the full shaft length is required.

Key Features

• 1/4-20 UNC coarse thread for broad compatibility with standard tapped holes
• Fully threaded 7/8-inch length under head maximizes thread engagement
• 3/16-inch hex socket drive for use with standard Allen keys or hex drivers
• Alloy steel construction provides high tensile strength
• Black oxide finish coating reduces surface corrosion in low-moisture environments
• Meets ASME/ANSI B18.3 and ASTM A574 fastener standards

Compatibility

Designed as a standard 1/4-20 UNC hex socket cap screw suitable for any tapped hole or nut conforming to the 1/4-20 UNC thread standard in mechanical, HVAC, plumbing, and general industrial assemblies.

Installation Notes

Installation is performed with a 3/16-inch hex key or Allen-head bit driver. Always de-energize and lock out any equipment before replacing or tightening fasteners on live mechanical assemblies. Verify thread condition in the receiving hole before installation to avoid cross-threading. Follow applicable equipment manufacturer torque guidelines and relevant codes such as ASME standards for fastener applications.