--- product_id: 257362955 title: "Mellewell 1/4-20 x 3-1/2\" Hex Head Bolts with Hex Nuts and Thick Flat & Lock Washers, Fully Threaded, Stainless Steel 18-8, Plain Finish, 8 Sets" brand: "mellewell" price: "3188 som" currency: KGS in_stock: true reviews_count: 13 category: "Mellewell" url: https://www.desertcart.kg/products/257362955-mellewell-1-4-20-x-3-1-2-hex-head store_origin: KG region: Kyrgyzstan --- # 1/4-20 Thread Diameter Fully Threaded 3.5-inch Length 18-8 Stainless Steel Corrosion Resistance Mellewell 1/4-20 x 3-1/2" Hex Head Bolts with Hex Nuts and Thick Flat & Lock Washers, Fully Threaded, Stainless Steel 18-8, Plain Finish, 8 Sets **Brand:** mellewell **Price:** 3188 som **Availability:** ✅ In Stock ## Summary > 🔧 Lock in strength, unlock endless possibilities! ## Quick Answers - **What is this?** Mellewell 1/4-20 x 3-1/2" Hex Head Bolts with Hex Nuts and Thick Flat & Lock Washers, Fully Threaded, Stainless Steel 18-8, Plain Finish, 8 Sets by mellewell - **How much does it cost?** 3188 som with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.kg](https://www.desertcart.kg/products/257362955-mellewell-1-4-20-x-3-1-2-hex-head) ## Best For - mellewell enthusiasts ## Why This Product - Trusted mellewell brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Complete Assembly Kit:** Includes 8 sets of hex bolts, nuts, thick flat & lock washers for a ready-to-use fastening solution. - • **Trusted by Professionals:** Ranked #22 in Hex Bolts, delivering reliable performance and peace of mind. - • **Versatile Industrial Grade:** Ideal for home, office, machinery, ship assembly, and communication equipment applications. - • **Precision Engineered Strength:** Crafted from premium 18-8 stainless steel for unmatched durability and corrosion resistance. - • **Fully Threaded for Maximum Grip:** 3-1/2 inch length with full threading ensures secure fastening in diverse materials. ## Overview The Mellewell 1/4-20 x 3-1/2" Hex Head Bolt sets feature fully threaded 18-8 stainless steel bolts with hex nuts and thick flat & lock washers. Engineered for superior corrosion resistance and strength, these 8 complete sets are perfect for professional-grade fastening in industrial, home, and office applications. ## Description Product Description Hex head cap screws are precision threaded fasteners with an External Hex Drive. They are known for their effecient application performance and endurance widely used in a variety of industries such as construction, manufacturing, engineering, assembling, aircraft and so on. Product Specification Drive Type: External Hex Screw Style: Hex Head Thread Coverage: Fully Threaded Screw Size: 1/4-20 Screw Length: 3-1/2" Material: Stainless Steel 18-8 (304) Finish: Plain Finish Package Included 8 PCS Hex bolts, 8 PCS Hex nuts, 8 PCS Flat washers and 8 PCS Lock washers. Review: Nice. Be careful. - Nice bolts, lock washers and nuts. I saw some reviews that showed broken bolts and 1 star reviews. Stainless steel will break if it is over torqued or cross threaded. Don't need to do that. Review: Good bolts - Good bolts for marine use. Good thread engagement ## Features - Hex screw bolt can be widely used in the home and office appliance, communication equipments, ship assembly and other machinery industry. - Made of high quality 18-8 (304) stainless steel, provides strength and great protection from corrosions and tarnishing. - Screw Thread Diameter: 1/4"; Screw Thread Pitch: 20 TPI; Screw Length: 3-1/2". Extra-large and thick flat washer. - Package Included: 8 Sets Hex Head Bolts, Hex Nuts, Flat & Lock Washers. - Used Widely: Mellewell hex bolt kits can used widely in home, office, machinary. Any questions let us know and provide professional customer service. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B08G1HPJYY | | Best Sellers Rank | #4,612 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #11 in Hex Bolts | | Brand | Mellewell | | Color | Silver | | Customer Reviews | 4.7 4.7 out of 5 stars (961) | | Fastener Type | Bolt | | Finish Types | Bright | | Grade Rating | Grade 18 8 | | Item Diameter | 0.25 Inches | | Item Shape | Cylinder | | Manufacturer | Mellewell | | Material Type | Stainless Steel | | Number of Pieces | 32 | | Screw Head Style | Hex | | Size Name | 1/4-20 x 3-1/2" | | Thread Size | 1/4"-20 | | Unit Count | 8 Count | ## Product Details - **Brand:** Mellewell - **Color:** Silver - **Fastener Type:** Bolt - **Material:** Stainless Steel - **Size:** 1/4-20 x 3-1/2" ## Images ![Mellewell 1/4-20 x 3-1/2" Hex Head Bolts with Hex Nuts and Thick Flat & Lock Washers, Fully Threaded, Stainless Steel 18-8, Plain Finish, 8 Sets - Image 1](https://m.media-amazon.com/images/I/618w+wIGMIL.jpg) ![Mellewell 1/4-20 x 3-1/2" Hex Head Bolts with Hex Nuts and Thick Flat & Lock Washers, Fully Threaded, Stainless Steel 18-8, Plain Finish, 8 Sets - Image 2](https://m.media-amazon.com/images/I/61RtPnWBTyL.jpg) ![Mellewell 1/4-20 x 3-1/2" Hex Head Bolts with Hex Nuts and Thick Flat & Lock Washers, Fully Threaded, Stainless Steel 18-8, Plain Finish, 8 Sets - Image 3](https://m.media-amazon.com/images/I/61c3dTdzj+L.jpg) ![Mellewell 1/4-20 x 3-1/2" Hex Head Bolts with Hex Nuts and Thick Flat & Lock Washers, Fully Threaded, Stainless Steel 18-8, Plain Finish, 8 Sets - Image 4](https://m.media-amazon.com/images/I/61cyZuoPV8L.jpg) ![Mellewell 1/4-20 x 3-1/2" Hex Head Bolts with Hex Nuts and Thick Flat & Lock Washers, Fully Threaded, Stainless Steel 18-8, Plain Finish, 8 Sets - Image 5](https://m.media-amazon.com/images/I/61V1sBHNUVL.jpg) ## Available Options This product comes in different **Color, Size, Number Of Items** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Nice. Be careful. *by J***Y on March 20, 2026* Nice bolts, lock washers and nuts. I saw some reviews that showed broken bolts and 1 star reviews. Stainless steel will break if it is over torqued or cross threaded. Don't need to do that. ### ⭐⭐⭐⭐⭐ Good bolts *by D***. on March 25, 2026* Good bolts for marine use. Good thread engagement ### ⭐⭐⭐⭐⭐ Nuts,bolts and washers *by T***N on February 24, 2026* Black nuts, bolts and washers. Not cheap good quality. --- ## 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.kg/products/257362955-mellewell-1-4-20-x-3-1-2-hex-head](https://www.desertcart.kg/products/257362955-mellewell-1-4-20-x-3-1-2-hex-head) --- *Product available on Desertcart Kyrgyzstan* *Store origin: KG* *Last updated: 2026-05-04*