Value Collection C38204 Machine Screw 1/4-20 X 3.5 in Ss 18-8

Product Description

The VALUE COLLECTION C38204 is a 1/4-20 x 3.5-inch flat head Phillips machine screw manufactured from grade 18-8 stainless steel with a bright, uncoated finish. This fastener uses Unified National Coarse (UNC) threading and is sized for applications requiring a countersunk, flush-mount head profile. The Phillips drive allows installation with standard hand tools or power drivers. At 3.5 inches of overall length, this screw suits medium-depth fastening tasks in corrosion-prone or sanitary environments. Sold in a package of 25, it is well suited for light fabrication, equipment assembly, and maintenance work across HVAC, plumbing, and general trade applications.

This screw is appropriate for use in residential and commercial settings where stainless steel corrosion resistance is required. Typical install scenarios include panel attachment, equipment enclosure assembly, and mechanical component mounting. The flat head profile seats flush with the mating surface when a countersunk hole is present, making it a common choice for sheet metal, plastic panels, and structural brackets. The 1/4-20 UNC thread is one of the most widely used coarse-thread standards in North American trade work.

Key Features

• Grade 18-8 stainless steel construction for corrosion and oxidation resistance
• 1/4-20 UNC coarse thread for broad tool and hardware compatibility
• 3.5-inch overall length suits medium-depth fastening applications
• Flat head profile designed for countersunk, flush-mount installations
• Phillips drive compatible with standard screwdrivers and power bits
• Bright, uncoated finish — no coating to chip or flake in service

Compatibility

Designed as a standard 1/4-20 UNC flat head Phillips machine screw for use wherever this thread size and head style are specified in mechanical and trade assemblies.

Installation Notes

Installation requires a properly countersunk pilot hole sized for the 1/4-20 thread diameter to achieve a flush seating flat head. Use a correctly sized Phillips bit to avoid cam-out and fastener damage, particularly in stainless steel, which is susceptible to galling if driven at excessive speed. A thread lubricant or anti-seize compound is recommended when joining stainless fasteners to stainless mating hardware. Follow applicable mechanical codes and equipment manufacturer torque guidance for the assembly being serviced.