Value Collection 409144BR Set Screw 7/8-9 X 3-1/2 in Cup Point

Product Description

The VALUE COLLECTION 409144BR is a cup point set screw designed for secure shaft-to-hub and collar-to-shaft locking applications in mechanical assemblies. Manufactured from Grade 2 alloy steel, it delivers solid holding strength in moderate-load applications. The screw measures 7/8-9 thread size at 3-1/2 inches in length, measured under the head, and follows the UNC thread standard. Drive type is square, which accepts a matching square key wrench for reliable torque transfer. Machinists, maintenance technicians, and mechanical contractors install this fastener when a positive bite into a shaft surface is required without permanent fastening.

This set screw fits standard mechanical assemblies where a cup point style is specified to grip into a shaft surface without through-drilling. Common applications include shaft collars, pulleys, sprockets, couplings, and similar power-transmission components in industrial, HVAC, and light mechanical settings. The 7/8-9 UNC thread is a common fractional-inch coarse thread, compatible with tapped holes machined to that standard. Sold individually; minimum order quantity is 10 units.

Key Features

• Cup point geometry bites into shaft material for positive grip without permanent deformation
• Grade 2 alloy steel construction provides reliable tensile strength for moderate clamping loads
• Square drive accepts a square key wrench for controlled torque application in tight installations
• UNC thread standard ensures compatibility with standard fractional-inch tapped holes
• Length measured under head at 3-1/2 inches for accurate fit in deep tapped holes

Compatibility

Designed as a standard replacement or supplemental fastener for any mechanical assembly specifying a 7/8-9 UNC cup point set screw with a square drive in alloy steel.

Installation Notes

Installation is performed by machinists or mechanical maintenance technicians using a properly sized square drive key wrench. De-energize and lock out any rotating equipment before servicing shaft assemblies. Thread engagement should be verified to be full and clean before applying torque. Avoid cross-threading by hand-starting the screw before applying tool pressure.