Midwest Fasteners Black Oxide Steel Fine Thread Hex Socket Headless Set Screw

Midwest Fasteners Black Oxide Steel Fine Thread Hex Socket Headless Set Screw

The Midwest Fasteners Black Oxide Steel Fine Thread Hex Socket Headless Set Screw is a family of fine-thread steel set screws built for applications where a flush, headless profile is required to secure a collar, pulley, gear or shaft without any protruding hardware. The family is offered in 13 fine-thread size and length combinations, ranging from #6-40 x 1/8" up through 5/8"-18 x 5/8", including #10-32, 1/4"-28, 5/16"-24, 3/8"-24 and 1/2"-20 configurations in multiple lengths, so the correct size can be matched to the specific shaft, collar or component being secured. Every size is machined from steel and finished in black oxide, and every size uses the same hex socket connection for internal wrenching with a standard Allen-style hex key, letting the screw seat completely flush or below the surrounding surface.

Key Features

• Available Sizes: 13 fine-thread size and length combinations from #6-40 x 1/8" to 5/8"-18 x 5/8", covering small instrument work up through heavier shaft and collar applications.
• Thread: Fine thread pitch on every size for increased holding power and resistance to loosening under vibration.
• Material & Finish: Steel construction with a black oxide finish for corrosion resistance and a non-reflective black appearance.
• Drive: Hex socket connection allows the screw to be installed and removed with a standard hex key, even in recessed or tight locations.
• Headless Design: Socket set screw profile sits flush or below the surrounding surface, eliminating a protruding head that could snag or interfere with moving parts.
• Color: Black finish for a consistent, low-visibility appearance on finished equipment.

Technical Specifications

• Product Type: Socket Set Screw
• Product Material: Steel
• Finish: Black Oxide
• Connection Type: Hex Socket
• Product Color: Black
• Country of Origin: China
• Trade Size: #6-40 - 5/8"-18

Typical Applications

• Securing shaft collars, pulleys and gears to shafts without a protruding head
• Machine and equipment maintenance where a flush fastener is required
• Fabrication and assembly work requiring a locking set screw in tight clearances
• General industrial and mechanical repair applications

Why Midwest Fasteners?

Midwest Fasteners builds this set screw family from steel with a consistent black oxide finish and fine thread pitch across the full size range, giving maintenance techs and fabricators a dependable, headless fastening option for shaft and collar work at nearly any scale. The hex socket connection ensures reliable torque transfer during installation and removal, making this family of set screws a practical choice for professional and DIY mechanical work alike, whatever size the job calls for.