Value Collection 1524MSR 1/4-28 Round Head Slotted Machine Screw

Product Description

The VALUE COLLECTION 1524MSR is a 1/4-28 unified fine-thread machine screw with a round head and slotted drive, sized at 1.5 inches length under head. Manufactured from steel with a zinc finish, it meets ASME B18.6.3 and SAE J82 standards. This screw is suited for general mechanical assembly, equipment mounting, and maintenance tasks across HVAC, plumbing, electrical, and industrial service applications. It is sold as a single-piece package with a minimum order quantity of 100 units, making it appropriate for job-lot purchasing by trade contractors and facilities maintenance teams.

This fastener fits standard 1/4-28 UNF tapped holes and is a common choice for light-to-medium duty metal-to-metal or metal-to-bracket assemblies. The slotted drive accommodates flat-head screwdrivers for installations in confined spaces where socket or hex tools may not be practical. The zinc finish provides basic corrosion resistance suitable for indoor and sheltered environments. Trade professionals use this screw type in panel assembly, equipment covers, junction boxes, and general service hardware replacement.

Key Features

• 1/4-28 unified fine thread for secure engagement in standard UNF tapped holes
• 1.5 inches length under head provides adequate grip range for typical bracket and panel applications
• Round head profile distributes clamping load over a wider bearing surface
• Slotted drive compatible with standard flat-head screwdrivers
• Zinc finish offers basic corrosion protection for indoor and sheltered use
• Meets ASME B18.6.3 and SAE J82 dimensional and material standards

Compatibility

Designed for use in any standard 1/4-28 UNF tapped hole application requiring a round head slotted machine screw per ASME B18.6.3.

Installation Notes

Installation is performed by hand-threading into a pre-tapped or properly tapped 1/4-28 UNF hole using a flat-head screwdriver of appropriate blade width. Ensure the mating thread is clean and free of debris before driving the screw. Do not overtighten, as the slotted drive is susceptible to cam-out under excessive torque. Confirm power is off and equipment is de-energized before replacing fasteners on live electrical panels or HVAC components.