Value Collection 581123PR Hex Socket Cap Screw 4-40 Unc

Product Description

The VALUE COLLECTION 581123PR is a 4-40 UNC hex socket cap screw designed for precision fastening in mechanical assemblies, fixtures, and equipment where a low-profile, high-strength fastener is required. Manufactured from alloy steel with a black oxide finish, this screw offers improved corrosion resistance over bare steel and reduces light reflection in finished assemblies. The 3/32 inch hex drive allows use with standard Allen keys and hex drivers. With 1 inch of length under the head and partial threading, it is suited for clamping applications where a smooth shank provides load bearing along the grip length. Licensed machinists, maintenance technicians, and mechanical assemblers are the typical end users for this fastener.

This screw is commonly used in light machinery, electronic enclosures, tooling fixtures, and precision mechanical equipment where the 4-40 UNC thread size is called out. The partially threaded shank makes it appropriate for bolted joints requiring a defined grip length. It conforms to ASME/ANSI B18.3 and ASTM A574 standards, making it suitable for applications where dimensional and mechanical property compliance is specified. Minimum order quantity is 100 pieces per order.

Key Features

• 4-40 UNC thread size for standard fine-pitch light fastening applications
• Alloy steel construction meets ASTM A574 mechanical property requirements
• Black oxide finish provides mild corrosion resistance and a non-reflective surface
• Partial threading allows smooth shank to act as a bearing surface in bolted joints
• 3/32 inch hex socket drive compatible with standard Allen keys and hex bit drivers
• Conforms to ASME/ANSI B18.3 dimensional standard

Compatibility

Designed as an OEM-style and general-use replacement or specification fastener for any application calling out a 4-40 UNC hex socket cap screw with 1 inch length under head, conforming to ASME/ANSI B18.3 and ASTM A574.

Installation Notes

Installation is performed by machinists, maintenance technicians, or mechanical assemblers using a 3/32 inch hex key or hex bit driver. Ensure mating threads are clean and free of debris before installation. Do not overtighten, as the 4-40 thread size has a low torque capacity and is susceptible to thread stripping. Follow equipment manufacturer torque specifications where provided.