Value Collection 581933BR Hex Socket Cap Screw 1-1/4-12 Unf

Product Description

The VALUE COLLECTION 581933BR is a partially threaded hex socket cap screw designed for high-strength fastening applications in industrial, mechanical, and structural assemblies. Sized at 1-1/4-12 UNF with a 10-inch length under head, this screw is turned with a 7/8-inch hex drive. Constructed from alloy steel with a black oxide finish, it delivers corrosion resistance and reduced surface reflectivity. The partial threading allows for unthreaded shank engagement, which is critical in applications requiring precise shoulder load transfer and shear resistance. Machinists, millwrights, and industrial maintenance technicians are the typical installers for this fastener class.

This screw is suited for heavy-duty mechanical assemblies where a fine unified thread pitch and substantial grip length are required. The 1-1/4-12 UNF thread series provides finer thread engagement than coarse-series equivalents, making it appropriate for high-vibration environments or applications demanding close tolerance fit. The alloy steel construction supports high tensile and proof loads consistent with ASTM A574 and ASME/ANSI B18.3 standards. It is commonly used in presses, dies, tooling fixtures, and heavy equipment maintenance.

Key Features

• 1-1/4-12 UNF fine thread for high-load, vibration-resistant fastening
• 10-inch length under head with partial threading for shank bearing and shear load applications
• 7/8-inch hex socket drive for use with standard hex keys or socket drivers
• Alloy steel construction meets ASTM A574 requirements for high-strength socket cap screws
• Black oxide finish provides mild corrosion resistance and low-glare surface
• Manufactured to ASME/ANSI B18.3 dimensional standards

Compatibility

Designed as an OEM-style replacement or direct-use fastener for industrial assemblies requiring 1-1/4-12 UNF partially threaded hex socket cap screws conforming to ASME/ANSI B18.3 and ASTM A574 specifications.

Installation Notes

Installation should be performed by qualified machinists or maintenance technicians using a calibrated torque wrench and the appropriate 7/8-inch hex key or socket tool. Always clean and inspect threaded holes for damage or contamination before installation. De-energize, lock out, and tag out all equipment per applicable OSHA lockout/tagout procedures before working on any assembly. Do not exceed the fastener's rated proof load, and consult engineering specifications for torque values appropriate to your specific application and joint material.