--- product_id: 111681400 title: "5-40 x 1/4\" Button Head Socket Cap Screws, Allen Socket Drive, Black Oxide, Alloy Steel, Fully Threaded, Machine Thread, Quantity 50" brand: "fastenere" price: "€ 22.09" currency: EUR in_stock: true reviews_count: 7 category: "Home Improvement" url: https://www.desertcart.be/products/111681400-5-40-x-1-4-button-head-socket-cap-screws store_origin: BE region: Belgium --- # 0.125" Diameter High Tensile Strength 50 Count 5-40 x 1/4" Button Head Socket Cap Screws, Allen Socket Drive, Black Oxide, Alloy Steel, Fully Threaded, Machine Thread, Quantity 50 **Brand:** fastenere **Price:** € 22.09 **Availability:** ✅ In Stock ## Summary > 🔧 Screw Your Limits Away! ## Quick Answers - **What is this?** 5-40 x 1/4" Button Head Socket Cap Screws, Allen Socket Drive, Black Oxide, Alloy Steel, Fully Threaded, Machine Thread, Quantity 50 by fastenere - **How much does it cost?** € 22.09 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/products/111681400-5-40-x-1-4-button-head-socket-cap-screws) ## Best For - fastenere enthusiasts ## Why This Product - Trusted fastenere brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Easy Installation:** Allen hex drive allows for quick and secure fastening. - • **Low Profile Design:** Maximizes space efficiency without compromising strength. - • **Precision Engineering:** Crafted for exacting standards, these screws ensure a perfect fit every time. - • **Versatile Application:** Ideal for a range of projects, from DIY to professional machinery. - • **Durable Black Oxide Finish:** Resistant to corrosion, maintaining a sleek look while enhancing longevity. ## Overview This pack of 50 high-quality 5-40 x 1/4" button head socket cap screws is designed for professionals and DIY enthusiasts alike. Made from alloy steel with a durable black oxide finish, these fully threaded screws feature a low profile design and high tensile strength, making them perfect for a variety of applications. ## Description Fastenere Button Head Socket Cap Screws Button Head Socket Cap Screws are commonly used in machine parts, die fixturing, and clamping. The socket head enables driving where there is not sufficient space for wrenches or sockets. Button socket cap screws offer a wider bearing surface and high tensile strength but are still low profile like other socket cap screws. Black Oxide, blackening, oxidizing, oxiding, black passivating, gun bluing . . . these terms all refer to the process of forming a black iron oxide on the surface of ferrous metals. Black oxide is a conversion coating formed by a chemical reaction produced when parts are immersed in the alkaline aqueous salt solution operated at approximately 285 degrees F. The reaction between the iron of the ferrous alloy and the hot oxide bath produces a magnitite (Fe3 O4) on the actual surface of the part. The black oxide process is a chemical conversion coating. This means that the black oxide is not deposited on the surface of the substrate like nickel or zinc electroplating. Instead, the black oxide coating is produced by a chemical reaction between the iron on the surface of the ferrous metal and the oxidizing salts present in the black oxide solution. These oxidizing salts include penetrates, catalysts, activators and proprietary additives which all take part in the chemical reaction. The result of this chemical reaction is the formation of black iron oxide, magnetite (Fe3O4), on the surface of the metal being coated. Black oxide has a range of unique properties and benefits that can be applied to a variety of industries. ## Features - About this item - Thread Diameter 0.125" - Head Diameter 0.238" - Head Height 0.066" - Allen Hex Drive Size 5/64" - Button socket cap screws offer a wider bearing surface and high tensile strength but are still low profile like other socket cap screws. - ›See more product details ## Images ![5-40 x 1/4" Button Head Socket Cap Screws, Allen Socket Drive, Black Oxide, Alloy Steel, Fully Threaded, Machine Thread, Quantity 50 - Image 1](https://m.media-amazon.com/images/I/41hjGL14cfL.jpg) ![5-40 x 1/4" Button Head Socket Cap Screws, Allen Socket Drive, Black Oxide, Alloy Steel, Fully Threaded, Machine Thread, Quantity 50 - Image 2](https://m.media-amazon.com/images/I/41hMZSgoKaL.jpg) ![5-40 x 1/4" Button Head Socket Cap Screws, Allen Socket Drive, Black Oxide, Alloy Steel, Fully Threaded, Machine Thread, Quantity 50 - Image 3](https://m.media-amazon.com/images/I/413hCB36CDL.jpg) ![5-40 x 1/4" Button Head Socket Cap Screws, Allen Socket Drive, Black Oxide, Alloy Steel, Fully Threaded, Machine Thread, Quantity 50 - Image 4](https://m.media-amazon.com/images/I/41FYypHQRrL.jpg) ![5-40 x 1/4" Button Head Socket Cap Screws, Allen Socket Drive, Black Oxide, Alloy Steel, Fully Threaded, Machine Thread, Quantity 50 - Image 5](https://m.media-amazon.com/images/I/41w2+B75fNL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Excellent for rifle trigger guard *by A***O on Reviewed in the United States on October 8, 2018* Excellent fit on the trigger guard of my rifle, way better than the worm screw that came with it! ### ⭐⭐⭐⭐⭐ Perfect for AR lower!! *by M***S on Reviewed in the United States on May 31, 2019* I got these to replace my magpul set screw, and they worked great! Way more sturdy! ### ⭐⭐⭐⭐⭐ Good Product *by L***E on Reviewed in the United States on November 28, 2019* Products were exactly as described and worked perfectly. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.be/products/111681400-5-40-x-1-4-button-head-socket-cap-screws](https://www.desertcart.be/products/111681400-5-40-x-1-4-button-head-socket-cap-screws) --- *Product available on Desertcart Belgium* *Store origin: BE* *Last updated: 2026-04-26*