--- product_id: 104206288 title: "M4 (4mm x 20mm) Flat Repair Washer (Large OD) - Stainless Steel (A2) (Pack of 20)" brand: "singularity supplies" price: "11002CFA" currency: XOF in_stock: true reviews_count: 11 category: "Singularity Supplies" url: https://www.desertcart.sn/products/104206288-m4-4mm-x-20mm-flat-repair-washer-large-od-stainless store_origin: SN region: Senegal --- # Durable polished stainless steel 4mm thickness precision Fits M4 fasteners perfectly M4 (4mm x 20mm) Flat Repair Washer (Large OD) - Stainless Steel (A2) (Pack of 20) **Brand:** singularity supplies **Price:** 11002CFA **Availability:** ✅ In Stock ## Summary > 🔧 Elevate your fastening game with precision and polish! ## Quick Answers - **What is this?** M4 (4mm x 20mm) Flat Repair Washer (Large OD) - Stainless Steel (A2) (Pack of 20) by singularity supplies - **How much does it cost?** 11002CFA with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sn](https://www.desertcart.sn/products/104206288-m4-4mm-x-20mm-flat-repair-washer-large-od-stainless) ## Best For - singularity supplies enthusiasts ## Why This Product - Trusted singularity supplies brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Optimized for M4 Fasteners:** Perfectly sized to fit M4 bolts, delivering seamless compatibility and professional results. - • **Premium A2 Stainless Steel:** Corrosion-resistant polished finish for long-lasting durability and sleek aesthetics. - • **Large Outer Diameter Design:** Spreads load effectively on thin or worn surfaces, preventing damage and enhancing stability. - • **Pack of 20 for Bulk Projects:** Ideal for professionals and DIYers who demand quality and quantity in one package. - • **Precision Engineered 4mm Thickness:** Ensures consistent load distribution and reliable fastening every time. ## Overview The M4 (4mm x 20mm) Flat Repair Washer pack features 20 high-quality A2 stainless steel washers with a large outer diameter designed to evenly distribute load on M4 fasteners. Engineered to ISO 965 standards, these polished flat washers offer corrosion resistance and durability, making them perfect for professional repairs and projects requiring reliable, long-lasting fastening solutions. ## Description Product Description Washers Flat Washers: A standard washer with a central hole, used to spread the load on surfaces fastened with screwed fixings. Split Washers: A washer with a split section in the diameter that helps provide resistance to unwanted loosening due to vibration. Wave / Crinkle Washers: A variant of washer that has a wave effect across the diameter of the surface providing greater tension between the surface and the screwed fastener. Locking / Shakeproof Washers: A washer with grooves, teeth, or ridges that grip firmly in to the surfaces to provide a strong resistance against unwanted turning. Finishing / Conical Washers: Provide a more finished appearance when used with the appropriate fasteners by providing a smooth finish to surfaces when using fasteners that would otherwise have the head visible. While still providing extra torsion on the surface. Tab Washer: A flat washer with 1 or 2 additional 'tabs' that can be bent in to place once fitted to lock the washer in to place. Standard (Form A-D) A flat washer with a standard central hole, with the specifications determined by the 'form'. Form A: Normal diameter, normal thickness Form B: Normal diameter, light thickness Form C: Large diameter, normal thickness Form D: Large diameter, light thickness Standard (Form E-G) Form E: Larger diameter, normal thickness Form F: Larger again diameter, normal thickness Form G: Largest diameter, larger thickness. Repair / Large OD / Penny / MudGuard / Fender A flat washer with a particularly large outer diameter (OD) in proportion to its central hole. These are commonly used to spread the load on thin sheet metal but can also be used to make a connection to a hole that has been enlarged by rust or wear. Other Construction (Square Hole): A typical flat washer but with a square central hole, designed to fit square-neck fixings such as "Carriage" or "Coach" bolts more securely. Metric sizes are described for the appropriate (equivalent) bolt as the squared neck should always be relatively sized to the bolt shaft. Square: A typical washer with a circular central hole but a squared outer edge designed to be recessed preventing turning once fitted. Small OD / Cheese: Washers with a standard central hole, but a much thinner outer diameter that can sometimes be entirely hidden by the head of the bolt / screw used. Wave / Crinkle A variant of washer that has a wave effect across the diameter of the surface providing greater tension between the surface and the screwed fastener. Crinkle and wave washers are very similar, and function identically, but crinkle variants tend to be slightly thinner, and with more peaks in the surface than typical wave washers. Split A washer with a split section in the diameter that helps provide resistance to unwanted loosening due to vibration. Tabbed A flat washer with 1 or 2 additional 'tabs' that can be bent in to place once fitted to lock the washer in to place. Conical / Finishing Provide a more finished appearance when used with the appropriate fasteners by providing a smooth finish to surfaces when using fasteners that would otherwise have the head visible. While still providing extra torsion on the surface. How to Measure Materials Review: Good quality - Used as part of refitting parts to antique cast iron fireplace. Strong and good quality. Review: More than adequate for most scenarios - Good washers for environments with low acid and low salt etc. ## Features - Washer Type: Flat - Material: Stainless Steel - Measurement: Metric - Plating: N/A - Tolerance: ISO 965 Standard ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07N4466Y2 | | Best Sellers Rank | 34,980 in DIY & Tools ( See Top 100 in DIY & Tools ) 234 in Washers | | Brand Name | Singularity Supplies | | Colour | Silver | | Compatible Groove Diameter | 4 Millimeters | | Customer Reviews | 4.6 out of 5 stars 1,808 Reviews | | Exterior Finish | Stainless Steel | | Exterior finish | Stainless Steel | | Fastener Size | M4 | | Fastener Type | Flat | | Fastener size | M4 | | Finish Types | Polished | | Item Diameter | 2 Centimetres | | Item Dimensions | 12 x 2 x 1 centimetres | | Item Thickness | 4 Millimetres | | Item Weight | 60 Grams | | Item thickness | 4 Millimetres | | Manufacturer | Singularity Supplies Ltd | | Manufacturer Part Number | HU-XI-100 | | Material | Stainless Steel | | Material Type | Stainless Steel | | Metal | Stainless Steel | | Number Of Items | 1 | | Number of Pieces | 20 | | Outside Diameter | 2 Centimetres | | Outside diameter | 2 Centimetres | | Screw Head Style | Flat | | Set Name | M4 x 20 (A2) Stainless Steel Flat Washing Machine, Polished, Silver | | Size | M4 x 20 (A2) | | Thread Size | M4 | | Unit Count | 20 count | | Washer Type | Flat | | Washer type | Flat | ## Product Details - **Exterior finish:** Stainless Steel - **Fastener size:** M4 - **Material:** Stainless Steel - **Outside diameter:** 12 Centimetres - **Washer type:** Fender, Flat ## Images ![M4 (4mm x 20mm) Flat Repair Washer (Large OD) - Stainless Steel (A2) (Pack of 20) - Image 1](https://m.media-amazon.com/images/I/71TKW6-mhhL.jpg) ![M4 (4mm x 20mm) Flat Repair Washer (Large OD) - Stainless Steel (A2) (Pack of 20) - Image 2](https://m.media-amazon.com/images/I/61Nr8QvcWcL.jpg) ![M4 (4mm x 20mm) Flat Repair Washer (Large OD) - Stainless Steel (A2) (Pack of 20) - Image 3](https://m.media-amazon.com/images/I/81LZj0nI+WL.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good quality *by C***E on 9 August 2025* Used as part of refitting parts to antique cast iron fireplace. Strong and good quality. ### ⭐⭐⭐⭐⭐ More than adequate for most scenarios *by A***K on 1 January 2026* Good washers for environments with low acid and low salt etc. ### ⭐⭐⭐⭐⭐ Good quality *by I***L on 13 February 2024* They are the perfect size for what I needed them for! The holes at the bottom of my washing basket had gotten bigger over the years and the wheels started falling off. I was able to use one of these of each side of the base and now it is as good as new and the wheels don't fall off any more ## Frequently Bought Together - M4 (4mm x 20mm) Flat Repair Washer (Large OD) - Stainless Steel (A2) (Pack of 20) - M4 (4mm x 40mm) Phillips Pan Head Machine Screws - Steel (Pack of 20) DIN 7985 - M4 Washers, M4 x 9mm Metal Flat Penny Washers Thickness 0.8mm-A2 304 Stainless Steel Washers (50 Pack), AMLOOPH Large OD Plain Wide Metal Washers, Round Flat Spacer Repair Washer For Screws Bolts --- ## 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.sn/products/104206288-m4-4mm-x-20mm-flat-repair-washer-large-od-stainless](https://www.desertcart.sn/products/104206288-m4-4mm-x-20mm-flat-repair-washer-large-od-stainless) --- *Product available on Desertcart Senegal* *Store origin: SN* *Last updated: 2026-07-10*