The 4-40 x 3/8 size serves shaft, hub, collar, and adjustment assemblies that need an internal hex socket set screw in 18-8 stainless steel. Cone point versions use a cone tip that can indent the mating shaft for strong axial holding in fixed settings, especially when a prepared dimple is part of the design.

Common application reviews include hubs, pulleys, and couplings. Internal hex drive access is useful in collars, hubs, knobs, and compact mechanisms where a wrench must enter from the end of the screw rather than around an external head.

18-8 stainless steel is an 18% chromium and 8% nickel austenitic stainless material referenced to ASTM F880, used for general atmosphere, moisture exposure, and clean appearance. When standard catalog searches are too broad, Cold Headers supports precise socket set screw sourcing by size and point-style requirement.

Technical Highlights

• Material: 18-8 Stainless Steel
• Thread Size: 4-40
• Length: 3/8 in.
• Drive Type: Internal Hex
• Hex Key Size: 0.050 in.
• Available Points: Cone, Flat, Oval, 1/2 Dog
• Dimensional Standard: ASME B18.3
• Material Standard: ASTM F880

Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.