--- product_id: 15218159 title: "uxcell M3 x 40mm Alloy Steel Hex Bolt Socket Head Cap Screws Black 50 Pcs" brand: "uxcell" price: "€ 28.50" currency: EUR in_stock: true reviews_count: 13 url: https://www.desertcart.be/products/15218159-uxcell-m3-x-40mm-alloy-steel-hex-bolt-socket-head store_origin: BE region: Belgium --- # M3 x 40mm Fully Threaded Precision Black Oxidation Finish - Sleek & Corrosion-Resistant Grade 12.9 Alloy Steel - Ultra Durable uxcell M3 x 40mm Alloy Steel Hex Bolt Socket Head Cap Screws Black 50 Pcs **Brand:** uxcell **Price:** € 28.50 **Availability:** ✅ In Stock ## Summary > 🔧 Elevate Your Builds with Industrial-Grade Precision & Style! ## Quick Answers - **What is this?** uxcell M3 x 40mm Alloy Steel Hex Bolt Socket Head Cap Screws Black 50 Pcs by uxcell - **How much does it cost?** € 28.50 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/15218159-uxcell-m3-x-40mm-alloy-steel-hex-bolt-socket-head) ## Best For - uxcell enthusiasts ## Why This Product - Trusted uxcell brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Bulk Pack Convenience:** 50-piece set ensures you’re always stocked for your next build or repair, eliminating downtime and boosting productivity. - • **Sleek Black Oxidation:** Modern black finish not only looks professional but also provides superior corrosion resistance for long-term reliability. - • **Precision Fit & Finish:** M3 x 40mm fully threaded design ensures seamless compatibility and secure fastening in machinery, electronics, and furniture. - • **Ergonomic Hex Socket Head:** Recessed hex design prevents slipping and allows easy tightening with standard hex wrenches—perfect for precision assembly. - • **Industrial-Grade Strength:** Crafted from premium 12.9 grade alloy steel for maximum durability and high tensile strength—built to last through any project. ## Overview The uxcell M3 x 40mm Alloy Steel Hex Bolt Socket Head Cap Screws come in a 50-piece set, crafted from high-strength 12.9 grade alloy steel with a sleek black oxidation finish. Designed for professional-grade fastening, these fully threaded bolts feature a recessed hex socket head for easy, slip-resistant installation, making them ideal for machinery, electronics, and furniture applications. ## Description The outer edge of the head of the hexagon socket bolt is round, and the middle is a recessed hexagon. It is usually used with a hexagon wrench. Commonly used in machinery, it mainly has the advantages of easy fastening, disassembly, and not easy to slip corners. It is mostly used in places where the surface of the parts is required to be flat, and most of them are countersunk bolts, embedded in the parts. Hexagonal screws are widely used, ranging from household hardware, electrical products, mechanical equipment products, to ships, airplanes, etc. In short, hexagon socket bolts are mainly used in electrical appliances, mechanical equipment, furniture and other fields. The performance grades of hexagon socket bolts are divided into more than 10 grades, such as 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9, among which bolts of grade 8.8 and above are made of low-carbon alloy steel or medium-carbon steel and are heat-treated (quenched, tempering), commonly known as high-strength bolts, and the rest are commonly known as ordinary bolts. According to the stainless steel material, there are 201, 304 and 316 stainless steel. ## Features - Product Name : Socket Head Cup Screws;Material : 12.9 Grade Alloy Steel;Color : Black - Screw Standard : M3 x 40mm;Thread Dia. : 3mm - Thread Pitch : 0.5mm;Thread Length : 40mm / 1.6" - Head Diameter : 5.5mm;Head Height : 3mm - Weight : 100g;Package Content : 50(+/-2%) xSocket Head Cup Screws ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B00W97R5KU | | Best Sellers Rank | #277,282 in Industrial & Scientific (See Top 100 in Industrial & Scientific) #1,614 in Socket Head Screws | | Brand | uxcell | | Color | Black | | Compatible Groove Diameter | 3 millimeters | | Customer Reviews | 4.6 4.6 out of 5 stars (143) 4.6 out of 5 stars | | Drive System | External Hex | | Exterior Finish | Alloy Steel | | Fastener Size | M3 | | Fastener Type | Hexagon Bolt | | Finish Types | Black Oxidation | | Grade Rating | grade_12.9 | | Head Type | Socket | | Item Diameter | 3 millimeters | | Item Dimensions | 1.97 x 1.57 x 0.79 inches | | Item Weight | 0.27 g | | Manufacturer | uxcell | | Material Type | Alloy Steel | | Metal Type | Alloy Steel | | Model | a15030300ux0019 | | Number Of Items | 50 | | Number Of Pieces | 50 | | Outside Diameter | 3 millimeters | | Part Number | a15030300ux0019 | | Screw Head Style | Hex | | Screw Point Style | Round Point | | Set Name | 50 | | Set Screw Thread Type | Metric | | Size Name | 3 inches | | Thread Class | 2B | | Thread Coverage | Fully Threaded | | Thread Size | M3 | | Thread Style | Right Hand | | Thread Type | Metric | | Unit Count | 50 Count | ## Product Details - **Exterior Finish:** Alloy Steel - **Head Style:** Hex - **Item dimensions L x W x H:** 1.97 x 1.57 x 0.79 inches - **Material:** Alloy Steel - **Thread Size:** M3 ## Images ![uxcell M3 x 40mm Alloy Steel Hex Bolt Socket Head Cap Screws Black 50 Pcs - Image 1](https://m.media-amazon.com/images/I/61qQ+3QCVyL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good Quality *by on Reviewed in the United States February 8, 2025* ⭐️⭐️⭐️⭐️⭐️ Seller had Super Fast Shipping Very Nice item in Very Good Condition with a High Quality Appearance Very Good Value for the Price ⭐️⭐️⭐️⭐️⭐️ ### ⭐⭐⭐⭐⭐ So.... i bought them for a out of the ordinary "project" *by on Reviewed in the United States September 6, 2018* i have a Walther G22 in which parts for it just dont exist, and i dont feel like messing with sending it off. so i got some bad ammo which ended up blowing the charging handle off the rifle and ended up not repairable the rifle itself was fine. i bought these along with a set of nuts to go with them and did some rigging to "make" a new charging handle (in which now i have 50 replacements for). so far after around 500 rounds of .22LR ammo the first is still living good. so if these can take the forces of a rifle bolt moving around i'd come to think these would be good in the least for other maybe more relevant uses. ### ⭐⭐⭐⭐⭐ They're bolts *by on Reviewed in the United States December 1, 2022* They're still holding the parts I bought them for together. ## Frequently Bought Together - uxcell M3 x 40mm Alloy Steel Hex Bolt Socket Head Cap Screws Black 50 Pcs - 100pcs M3 x 8mm 12.9 Grade Alloy Steel Hex Socket Head Cap Screws Bolts,Black Oxide Finish - uxcell a16033100ux0563 M3 Carbon Steel Grade 8 Hexagon Hex Nut Black Carbon Steel (Pack of 100) --- ## 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/15218159-uxcell-m3-x-40mm-alloy-steel-hex-bolt-socket-head](https://www.desertcart.be/products/15218159-uxcell-m3-x-40mm-alloy-steel-hex-bolt-socket-head) --- *Product available on Desertcart Belgium* *Store origin: BE* *Last updated: 2026-09-16*