4-40 x 5/8 18-8 Stainless Steel Button Head Socket Cap Screw with Nylon Insert gives guards, covers, and panels a rounded head that sits lower than a standard socket head cap screw. Its insert creates thread-friction resistance to backing out under vibration without requiring a separate locking washer.
Button head geometry is useful around access covers, machine guards, and operator-contact surfaces where a smooth exposed profile is preferred. For packaging machinery, changeover plates, or access doors, confirm the mating thread, drive access, and whether surface contact from the button head suits the assembly.
The 18% chromium and 8% nickel austenitic stainless material is commonly chosen for general corrosion resistance, clean appearance, and ordinary moisture exposure. For higher preload potential with a deeper socket, compare 18-8 Socket Head Cap Screws with Nylon Insert. Cold Headers can help confirm the correct 18-8 button head nylon-insert size before quoting pricing and availability.
Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.
