Value Collection 581102PR Hex Socket Cap Screw 3-56 Unf

Product Description

The VALUE COLLECTION 581102PR is a hex socket cap screw designed for precision fastening applications requiring a compact, high-strength connection. Manufactured from alloy steel with a black oxide finish, this screw meets ASME/ANSI B18.3 and ASTM A574 standards. It features a 3-56 UNF thread size, a 1/2 inch length under head, and a 5/64 inch hex drive. The fully threaded shank maximizes thread engagement across the full usable length. This fastener is suited for mechanical assemblies, instrument panels, and small-component fixturing where a low-profile socket head is required.

This screw is commonly used in light mechanical assemblies, precision instruments, electronics enclosures, and industrial equipment where a fine-thread, small-diameter fastener is needed. The black oxide coating provides mild corrosion resistance and reduces light reflection, making it appropriate for controlled indoor environments. The 3-56 UNF thread is a fine-pitch designation suited for thin materials or applications where vibration resistance and close thread engagement are priorities.

Key Features

• 3-56 UNF fully threaded alloy steel construction for high tensile strength in a small form factor
• Black oxide finish provides mild corrosion resistance and a low-reflectance appearance
• 5/64 inch hex socket drive for use with standard hex keys or Allen drivers
• 1/2 inch length under head for use in shallow or thin-material assemblies
• Meets ASME/ANSI B18.3 and ASTM A574 dimensional and mechanical standards

Compatibility

Designed as an OEM-style replacement or standard-stock hex socket cap screw for any assembly specifying a 3-56 UNF, 1/2 inch length under head, alloy steel socket cap screw per ASME/ANSI B18.3.

Installation Notes

Installation should be performed by a qualified mechanic or assembler using a properly sized 5/64 inch hex key or driver to avoid cam-out and fastener damage. Ensure the mating threaded hole is clean and free of debris before assembly. Apply thread-locking compound if the application involves vibration. Do not exceed the rated torque range for a 3-56 alloy steel fastener as specified in ASME B18.3 guidelines.