Value Collection 1508MSR 1/4-28 X 1/2 in Round Head Slotted Screw

Product Description

The VALUE COLLECTION 1508MSR is a 1/4-28 UNF round head machine screw with a slotted drive, manufactured from steel with a zinc finish. It measures 1/2 inch in length under the head and is produced to ASME B18.6.3 and SAE J82 standards, making it a precise, dimensionally consistent fastener suited for general mechanical assembly. The zinc finish provides basic corrosion resistance in indoor and protected environments. This screw ships in a minimum order quantity of 100 pieces, making it appropriate for production assembly, MRO replenishment, and field service kits maintained by electricians, HVAC technicians, plumbers, and mechanical contractors.

The 1508MSR is well-suited for light to medium-duty fastening applications in electrical panels, HVAC equipment enclosures, plumbing fixture brackets, and general mechanical assemblies where a 1/4-28 fine thread pattern is specified. The round head profile distributes clamping load over a broad bearing surface and sits above the workpiece, making it easy to access with a standard flat-blade screwdriver. Fine thread engagement makes it appropriate for use in thinner materials or tapped holes where thread stripping risk must be minimized.

Key Features

• 1/4-28 UNF fine thread for secure engagement in tapped holes and thin-material applications
• Round head with slotted drive for straightforward installation with a standard flat-blade screwdriver
• Steel construction with zinc finish for basic corrosion resistance in dry or protected environments
• Conforms to ASME B18.6.3 and SAE J82 dimensional standards for consistent fitment
• Sold in multiples of 100 pieces, suitable for production line use and bulk MRO inventory
• No washer — designed for direct head-to-workpiece bearing

Compatibility

Designed as a standard inch-series machine screw for any application requiring a 1/4-28 UNF round head slotted fastener per ASME B18.6.3.

Installation Notes

Install using a correctly sized flat-blade screwdriver to prevent cam-out and slot damage. De-energize and lock out any electrical or mechanical equipment before fastener installation or removal in panel and equipment enclosure applications. Ensure the mating tapped hole or nut matches the 1/4-28 UNF thread specification before driving. Do not over-torque; round head screws have a lower drive recess depth than socket head types and are more susceptible to slot damage under excessive torque.