4-40 x 1 1/2 Knurled Point 18-8 Stainless Steel Socket Set Screw provides an exact-size stainless socket set screw for retaining components without an external head.

Cup-point serrations add bite at the contact area, making this style useful for shaft collars, stops, knobs, and adjustment parts that need localized holding contact.

For stainless assemblies, review thread fit and installation practice because stainless-on-stainless contact can raise galling concerns if the joint is assembled dry or repeatedly adjusted.

Use cases for 4-40 x 1 1/2 include machine rebuilds, process-area equipment, and small retained components and replacement assemblies, maintenance repairs, and exact-size service work where a headless internal-hex screw keeps the component exterior clear.

For 4-40, UNC has 40 threads per inch; check the 1 1/2 in. length against tapped depth and point location. Check the screw length against the contact location so the point reaches the intended surface without bottoming out. Cold Headers works with socket fastener requirements where small catalog details can affect the final order.

Technical Highlights

• Point Style: Knurled Point
• Material: 18-8 Stainless Steel
• Thread Size: 4-40
• Length: 1 1/2 in.
• Thread Series: UNC
• Threads Per Inch: 40
• Drive Type: Internal Hex