Value Collection 90686 Flat Head Machine Screw 1/4-20 Brass

Product Description

The VALUE COLLECTION 90686 is a 1/4-20 flat head slotted machine screw made from brass, designed for use in general fastening applications across mechanical and electrical assemblies. With a 3/4-inch overall length and a flat head profile that sits flush when countersunk, this screw suits installations where a low-profile finish and corrosion resistance are priorities. Manufactured to ASME B18.6.3 standards, it delivers consistent dimensional accuracy and thread quality. Licensed tradespeople and experienced assemblers working in HVAC, electrical, and plumbing trades reach for brass fasteners where galvanic compatibility, conductivity, or resistance to moisture and mild chemicals is a factor.

This machine screw is suited for light-duty mechanical and electrical assembly work in both residential and commercial settings. It is commonly used to secure panels, junction boxes, terminal blocks, and equipment covers where a countersunk flush-mount fastener is required. The slotted drive accommodates a standard flat-blade screwdriver, making it compatible with basic hand tools available in any service kit. It is sold in a minimum order quantity of 50 pieces per pack, making it appropriate for stocking in shop inventory or for use across multiple service calls.

Key Features

• Flat head profile sits flush with surface when properly countersunk
• 1/4-20 UNC thread for broad compatibility with standard tapped holes and nuts
• Brass construction offers natural corrosion resistance and galvanic compatibility with copper and brass fittings
• Slotted drive works with standard flat-blade screwdrivers — no specialty bits required
• Meets ASME B18.6.3 dimensional and tolerance standards
• Sold in multiples of 50 for shop stocking and multi-unit service use

Compatibility

Designed as a standard 1/4-20 UNC flat head slotted machine screw for use in any application requiring an ASME B18.6.3 compliant brass fastener with a countersunk head profile.

Installation Notes

Install using a flat-blade screwdriver sized appropriately for the slot to avoid cam-out or slot damage. When driving into a tapped hole or with a nut, do not overtighten brass fasteners — brass is softer than steel and threads can strip under excess torque. De-energize any electrical equipment before securing panels or covers with these fasteners. Ensure the mating material is countersunk to the correct angle to allow the flat head to seat fully flush.