4-40 x 3/8 1960 Series 18-8 Stainless Steel Socket Head Cap Screw with Nylon Insert is built for drawings that call for both stainless material and prevailing-torque thread locking. The pellet presses against the mating thread to provide prevailing torque without changing the socket head geometry.

In food-processing frames, sanitation-adjacent machinery, or equipment covers, the internal hex drive keeps installation compact while the insert adds thread-friction locking action. The 18% chromium and 8% nickel austenitic stainless material is used for general corrosion resistance and a clean appearance in ordinary industrial environments.

For rounded exposed heads with the same locking concept, review 18-8 Button Head Socket Cap Screws with Nylon Insert. For non-catalog pellet positions or unusual sizes, in-house pelletizing at the Chicago facility gives Cold Headers added sourcing flexibility.

Technical Highlights

• Series: 1960 Series
• Material: 18-8 Stainless Steel
• Thread Size: 4-40
• Length: 3/8 in.
• Drive Type: Internal Hex
• Locking Feature: Nylon insert providing prevailing torque
• Nylon Insert Diameter (P): 1/16 in.
• Nylon Insert Location (N): 7/64 in. +/-1/2 pitch
• Head Dimensions: ASME B18.3, 1960 Series

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