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4-40 Holster Screws in Stainless Steel and Titanium

Shop 4-40 screws for holster and knife sheath assembly, grip mounting and firearm accessories where a precise fit matters. Choose from flush flat heads, rounded button heads and recessed socket heads with Torx T-8, Torx T-10 or Phillips drives, in stainless steel, black oxide stainless or titanium.

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Two flat heads give a flush finish. The stainless version, driven by a Torx T-8, has a 0.250 inch thread and comes in 25 packs, while the Phillips version is black oxide coated stainless sold by the piece. Its 0.205 inch head pairs with #4 finishing washers, and on a holster or knife build it can take the place of #6 Chicago Screws or sit alongside them. Button heads leave a low, rounded top, and you can choose stainless T-8 button heads in 25 packs at 0.250 or 0.500 inch or a single CKK Design titanium button head.

Socket heads seat in a recess for a secure fit and come in stainless steel or titanium. The T-10 stainless socket head, sold in a 25 pack, is a shallow 302HQ design that is DFARS compliant and made in the USA. CKK Design's 6AL4V titanium socket head has a 0.210 inch wide head that stands 0.075 inch tall, while the titanium SK Design shallow socket head by Steve Kelly keeps head height to 0.060 inch in 0.250 or 0.375 inch thread lengths. Heat coloring the CKK Design titanium button and socket heads lets their finish match the rest of the build.

Write to our team for a second opinion on which 4-40 head suits a holster or sheath design, or return to holster screws for the 8-32 range.

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