Value Collection BT-440-125-AS Set Screw 4-40 X 1/8 in

Product Description

The VALUE COLLECTION BT-440-125-AS is a Grade 8 alloy steel set screw designed for secure, non-marring fastening in mechanical assemblies. Featuring a 4-40 UNC thread and a 1/8-inch threaded length, this screw uses a hex drive for controlled torque application. The soft tip point is fitted with a brass tip, which contacts the mating surface without damaging or gouging it. This makes it well-suited for locking components onto shafts, collars, or housings where surface integrity matters. Machinists, millwrights, and maintenance technicians regularly use this style of fastener in precision equipment, instrumentation, and light mechanical assemblies.

This set screw is used in applications where a standard cup-point or cone-point screw would mar a finished shaft or soft material surface. The 4-40 thread size targets small-diameter, fine-thread applications common in instrumentation, electronics hardware, and small mechanical assemblies. The brass tip distributes clamping load across the contact area, reducing the risk of indentation on softer shaft materials. Sold individually, with a minimum order quantity of 5 units.

Key Features

• Grade 8 alloy steel construction provides high tensile and shear strength for demanding clamping loads
• Soft tip point with brass tip prevents marring or gouging of mating shaft surfaces
• Hex drive socket allows precise torque control with standard hex keys or Allen drivers
• 4-40 UNC thread standard ensures broad compatibility with tapped holes in that size range
• 1/8-inch thread length suits shallow-depth installations in small components and thin-wall assemblies

Compatibility

Designed as a standard 4-40 UNC set screw for use in any tapped 4-40 threaded hole requiring a soft tip point fastener in small mechanical, instrumentation, or light industrial assemblies.

Installation Notes

Installation is performed by machinists or mechanical technicians using a properly sized hex key. Ensure the mating tapped hole is clean and free of debris before installation. De-energize or lock out any machinery before servicing components that involve set screws on rotating shafts. Do not overtighten, as the brass tip is softer than the alloy steel body and can deform under excessive torque.