Value Collection 111249PR Set Screw 1/4-20 X 3/8 in Grade 8

Product Description

The VALUE COLLECTION 111249PR is a 1/4-20 UNC set screw with a knurled cup point, manufactured from Grade 8 alloy steel. Set screws are headless fasteners used to secure a component — such as a gear, pulley, or collar — onto a shaft by applying compressive force at the point of contact. The knurled cup point bites into the mating surface to resist rotation and axial movement. This screw measures 3/8 inches in overall length and is driven with a 1/8-inch hex key. It conforms to ASME/ANSI B18.3 and ASTM F912 standards. Installers in mechanical, HVAC, and industrial maintenance applications use this type of fastener regularly.

This set screw is suited for light-to-medium duty shaft locking applications across residential and commercial mechanical systems. Typical use cases include securing fan hubs, blower wheel collars, and drive pulleys in HVAC equipment, as well as general industrial assembly and maintenance work. The knurled cup point is particularly effective on soft shaft materials where a more aggressive bite improves holding force without full penetration. This screw ships individually but is ordered in multiples of 100.

Key Features

• Knurled cup point provides enhanced grip and resistance to rotation on shaft surfaces
• Grade 8 alloy steel construction for high tensile and torsional strength
• 1/4-20 UNC thread for broad compatibility with standard inch-pattern hardware
• 1/8-inch hex drive — compatible with standard hex keys and T-handle drivers
• Conforms to ASME/ANSI B18.3 and ASTM F912 fastener standards
• 3/8-inch overall length suits shallow-hub and tight-clearance applications

Compatibility

Designed as a standard inch-series set screw for use in any application requiring a 1/4-20 UNC headless fastener with a knurled cup point and 1/8-inch hex drive.

Installation Notes

Set screws of this type are typically installed by maintenance technicians and mechanical contractors using a calibrated hex key or T-handle driver. De-energize and lock out all rotating equipment before installing or removing shaft-mounted fasteners. Avoid over-driving, which can strip the hex socket or damage the mating shaft. Refer to the equipment manufacturer's torque specifications and applicable ASME standards when a specific clamp load is required.