Value Collection MSRI0-500870-100B 5-40 X 7/8 in Machine Screw

Product Description

The VALUE COLLECTION MSRI0-500870-100B is a 5-40 x 7/8 inch round head slotted machine screw manufactured from steel with a zinc-plated finish. It meets ASME B18.6.3 and SAE J82 dimensional and mechanical standards, confirming consistent thread geometry, head height, and drive recess depth for reliable torque transfer. The zinc plating provides a basic level of corrosion resistance suited for general indoor mechanical assemblies. This fastener is installed by machinists, millwrights, HVAC technicians, electricians, and general maintenance professionals wherever a small-diameter inch-series machine screw is required.

This screw is suited for light-duty mechanical and electrical assembly applications across residential, commercial, and industrial environments. Typical uses include securing panel covers, terminal boards, small brackets, and equipment housings. The round head profile sits above the mating surface, making it appropriate for through-hole applications where a low-profile flat head is not required. The slotted drive accommodates a standard flat-blade screwdriver, which is common in field service and panel work. Length is measured under the head per ASME B18.6.3 conventions, so the 7/8 inch dimension reflects the full shank engagement length.

Key Features

• 5-40 UNC thread size for compatibility with standard inch-series tapped holes
• 7/8 inch length measured under the head per ASME B18.6.3
• Round head profile accommodates standard through-hole and clearance-hole installations
• Slotted drive accepts flat-blade screwdrivers for field installation
• Steel construction with zinc-plated finish for general-purpose corrosion resistance
• Meets ASME B18.6.3 and SAE J82 standards for dimensional and mechanical conformance

Compatibility

Designed as a general-purpose inch-series machine screw for use in any application requiring a 5-40 threaded fastener with a round slotted head and 7/8 inch shank length.

Installation Notes

Install using a flat-blade screwdriver sized to fit the slotted recess without slipping. Ensure the receiving hole is tapped to 5-40 UNC specifications before driving the screw. De-energize any electrical equipment and follow applicable lockout/tagout procedures before fastening or removing hardware in live panels or control enclosures. Do not overtighten into thin sheet metal or plastic standoffs, as the small thread diameter limits the applied torque before thread strip-out.