Value Collection 33678 Hex Socket Cap Screw 1/2-13 Unc

Product Description

The VALUE COLLECTION 33678 is a partially threaded hex socket cap screw designed for high-strength fastening applications in industrial, mechanical, and structural assemblies. Sized at 1/2-13 UNC with a 6-inch length under head, it is driven with a 3/8-inch hex (Allen) key. The fastener is machined from alloy steel and finished with a black oxide coating, which provides moderate corrosion resistance and reduces light reflection. This screw conforms to ASME/ANSI B18.3 and ASTM A574 standards, making it a reliable choice for load-bearing and precision-fit installations.

This cap screw is suited for use in machinery maintenance, equipment fabrication, fixture building, and general industrial assembly where a recessed hex drive is required. The partial thread design allows for precise clamping force control and is commonly used when threading into tapped holes in steel or iron components. Machinists, millwrights, and maintenance technicians are the typical installers in both shop and field settings.

Key Features

• 1/2-13 UNC thread size for standard coarse-thread tapped holes
• 6-inch length under head for deep fastening applications
• Partially threaded shank for controlled clamping and shoulder fit
• 3/8-inch hex socket drive for standard Allen key or hex bit installation
• Alloy steel construction meets ASTM A574 high-strength requirements
• Black oxide finish for moderate corrosion resistance and low reflectivity

Compatibility

Designed as a standard-fit replacement or stock fastener for applications requiring a 1/2-13 UNC coarse-thread hex socket cap screw conforming to ASME/ANSI B18.3 and ASTM A574 specifications.

Installation Notes

Installation is performed by machinists, millwrights, or maintenance technicians using a 3/8-inch hex key or hex drive bit. Ensure the receiving tapped hole is clean, properly sized to 1/2-13 UNC, and free of debris before installation. Apply thread-locking compound or anti-seize as required by the assembly specification. Do not use an impact driver without a torque-limiting attachment, as overdriving an alloy socket cap screw can shear the head or damage the tapped hole.