Value Collection 101691BR Set Screw 7/8-9 X 1-1/2 in Cup Point

Product Description

The VALUE COLLECTION 101691BR is a cup point set screw designed for secure shaft-to-hub and component-locking applications in mechanical assemblies. Manufactured from alloy steel, this fastener measures 7/8-9 thread size by 1-1/2 inches in overall length and is driven with a 1/2-inch hex key. The cup point geometry bites into the mating surface to resist rotation and axial movement without requiring a through-hole. Conforming to ASME/ANSI B18.3 and ASTM F912 standards, it suits demanding torque and load environments where dimensional accuracy and material strength are critical.

This set screw is used in a wide range of industrial and mechanical trade applications, including HVAC equipment assemblies, pump and motor shaft collars, sheaves, pulleys, and gears. It is appropriate for use in both light commercial and industrial settings wherever a reliable, headless locking fastener is specified. Machinists, millwrights, pipefitters, and HVAC/R technicians routinely use cup point set screws in rotating equipment and drive-train assemblies.

Key Features

• Cup point geometry provides positive bite into shaft material for high resistance to rotation and axial slip
• Alloy steel construction delivers the tensile and shear strength required in high-load mechanical joints
• 7/8-9 UNC thread form for broad compatibility with standard tapped bores
• 1/2-inch hex drive accepts standard hex keys and Allen wrenches
• Meets ASME/ANSI B18.3 and ASTM F912 dimensional and material standards
• Headless design allows flush or below-surface installation in rotating assemblies

Compatibility

Designed as an OEM-style replacement or maintenance fastener for mechanical assemblies requiring a 7/8-9 UNC cup point set screw with a 1/2-inch hex drive.

Installation Notes

Installation is typically performed by a machinist, millwright, or qualified mechanical technician. De-energize and lock out all rotating equipment before removing or installing set screws, in accordance with applicable OSHA lockout/tagout procedures. Use a properly sized 1/2-inch hex key to achieve full thread engagement and avoid rounding the drive socket. Do not reuse a set screw that shows signs of deformation, galling, or stripped threads.