--- product_id: 807403141 title: "M3.5 x 5mm 50 Pcs Set Screws, Headless Concave End, Grub Screws with Internal Hex Drive, 304 Stainless Steel, Metric Thread, for Bathroom Fixtures, Towel Racks, Light Fixtures" brand: "hirtuotter" price: "฿805" currency: THB in_stock: true reviews_count: 8 category: "Hirtu Otter" url: https://www.desertcart.co.th/products/807403141-m3-5-x-5mm-50-pcs-set-screws-headless-concave store_origin: TH region: Thailand --- # 50 pcs precision set screws internal hex drive for high torque 304 stainless steel corrosion-resistant M3.5 x 5mm 50 Pcs Set Screws, Headless Concave End, Grub Screws with Internal Hex Drive, 304 Stainless Steel, Metric Thread, for Bathroom Fixtures, Towel Racks, Light Fixtures **Brand:** hirtuotter **Price:** ฿805 **Availability:** ✅ In Stock ## Summary > 🔧 Lock it down with precision and style — don’t let your projects settle for less! ## Quick Answers - **What is this?** M3.5 x 5mm 50 Pcs Set Screws, Headless Concave End, Grub Screws with Internal Hex Drive, 304 Stainless Steel, Metric Thread, for Bathroom Fixtures, Towel Racks, Light Fixtures by hirtuotter - **How much does it cost?** ฿805 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/807403141-m3-5-x-5mm-50-pcs-set-screws-headless-concave) ## Best For - hirtuotter enthusiasts ## Why This Product - Trusted hirtuotter brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **24/7 Expert Support:** Dedicated customer service ready around the clock to ensure your project stays on track without a hitch. - • **Unmatched Durability:** Crafted from premium 304 stainless steel for superior rust and corrosion resistance, built to last indoors and out. - • **Eco-Conscious Packaging:** Reusable, organized storage bag prevents loss and supports sustainable practices—because every detail counts. - • **Secure, Headless Design:** Concave recessed end with internal hex drive delivers high torque and a flush, sleek finish for professional-grade fastening. - • **Precision Engineered Threads:** Uniform, burr-free M3.5 x 5mm threads ensure maximum holding power and vibration resistance—no loosening under pressure. ## Overview The HirtuOtter M3.5 x 5mm set screws come in a 50-piece pack made from high-quality 304 stainless steel, offering exceptional corrosion resistance and durability. Featuring a headless, concave end design with an internal hex drive, these screws provide secure fastening with high torque and vibration resistance. Packaged in an eco-friendly reusable bag, they are ideal for professional applications in bathroom fixtures, towel racks, and light fixtures, backed by 24/7 customer support. ## Description HirtuOtter Set Screws – 304 Stainless Steel with Recessed EndUpgrade your projects with HirtuOtter’s set screws. Made from premium 304 stainless steel, these screws offer excellent rust, oxidation, and corrosion resistance, making them ideal for both indoor and outdoor applications.Key Features:- High-Quality 304 Stainless Steel: Constructed from durable 304 stainless steel, these set screws provide superior strength and long-lasting corrosion resistance. The bright finish ensures a sleek, professional look while maintaining integrity even in harsh environments.- Recessed End & Internal Hex Drive: Designed with a recessed end and internal hex drive, these screws allow for strong torque and a secure fit. The recessed end ensures the screw stays in place under vibration and prevents loosening, making it Ideal for applications requiring a stable and reliable connection.- Precision Thread Design: The uniform thread pitch and clear, burr-free threads increase holding power, ensuring a secure connection that won’t loosen over time. Tested by Professional Thread Checker to ensure consistent quality and performance.- Eco-Friendly Packaging & Prevents Loss: These set screws come in a recyclable bag that helps prevent small parts from being lost and keeps your screws organized and protected. The bag also ensures easy storage and portability.- Professional Service: If you have any questions, our customer support team is available 24/7 to assist you, ensuring a hassle-free shopping experience.Why Choose HirtuOtter? HirtuOtter delivers high-quality, durable products built to last. Our stainless steel set screws with recessed ends are designed for superior performance, ensuring your projects stay secure and stable. With a focus on customer satisfaction, we provide excellent support to ensure your complete satisfaction.Usage Tips:- Use the Allen wrench or a compatible hex driver for installation. Avoid over-tightening to prevent damage.- Store screws in a dry environment to maintain their rust-free performance. The included plastic bag helps protect the screws from moisture and corrosion.Q&A:Q1: What is the advantage of the recessed end design on these set screws? A1: The recessed end design provides a more secure fit and prevents the screw from loosening under vibration. This ensures a stable and reliable connection, making it ideal for applications where high torque and secure fastening are required. Q2: Are these set screws corrosion-resistant? A2: Yes, these set screws are made from high-quality 304 stainless steel, which offers excellent resistance to rust, oxidation, and corrosion. Whether used indoors or outdoors, they are built to withstand harsh environments and maintain their integrity over time. Q3: How can I install these set screws?A3: You can easily install them using a hex wrench. The smooth, burr-free threads provide a secure fit with minimal effort, making installation quick and simple. Q4: What is the packaging like? A4: The set screws come in a reusable bag that helps prevent small parts from getting lost. The bag keeps your screws organized and makes them easy to store and transport, reducing the risk of accidental loss. In addition, reuse can minimize the impact on the environment to the greatest extent possible.Q5: How do I know the threads on these screws are reliable? A5: These set screws have been Tested by Professional Thread Checker, ensuring that the threads are uniform, clear, and free from burrs. This guarantees consistent quality and strong holding power, making them ideal for secure and long-lasting applications. Review: Good Quality - These screws work great for extending my PCB standoff. Easy to screw because it has the hexagon shape on one side Review: Stainless, well made metric solution - Worked great, exactly what I needed! 5mm hex bit fits it perfectly, and the point is concave so that when tightened, the clamped material will not shift. ## Features - Premium Stainless Steel: Made from high-quality 304 stainless steel, these socket set screws offer excellent corrosion, rust, and oxidation resistance, ensuring durability and reliable performance in a wide range of environments. Please note that the magnetic properties of 304 steel always show weak magnetic properties due to the structure transformation reasons. This will not affect its high rust resistance, feel confident choosing this. - Precision Thread Design: 50 PCS, M3.5 x 5mm set screws, these screws feature uniform thread spacing and clear threads to improve locking power, prevent loosening, and ensure stable fixation even under vibration and shock loads. Tested for consistent quality. Detailed product dimensions(tooth pitch, head diameter, etc) are available in our size chart for your reference. - Core Features: Featuring a recessed end design and internal hex drive, these screws provide high torque for a secure fit and prevent loosening. The clear thread pitch and strong vibration resistance make them suitable for various mechanical and equipment applications. - Eco-Friendly Packaging & Prevents Loss: Packaged in a reusable bag, this packaging not only allows for easy storage and portability but also helps prevent small parts from getting lost, keeping everything organized and secure. - Professional Service: If you have any questions, our customer support team is available 24/7 to provide professional assistance and ensure a smooth experience. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0DKYTFL6Q | | Best Sellers Rank | #12,309 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #14 in Set Screws | | Brand | HirtuOtter | | Color | Silver | | Customer Reviews | 4.7 out of 5 stars 52 Reviews | | Drive System | Internal Hex | | Exterior Finish | Stainless Steel | | Fastener Size | M3.5 | | Fastener Type | Machine Screw | | Finish Types | Polished | | Head Style | Headless | | Head Type | Hex | | Item Dimensions | 3.5 x 1.8 x 0.7 inches | | Item dimensions L x W x H | 3.5 x 1.8 x 0.7 inches | | Manufacturer | HirtuOtter | | Material | Stainless Steel | | Material Type | Stainless Steel | | Metal Type | Stainless Steel | | Number Of Items | 50 | | Number of Pieces | 50 | | Part Number | AF-WH-304-M | | Point Style | Concave End | | Screw Head Style | Headless | | Screw Point Style | Concave End | | Set Name | HirtuOtter Set Screws - 304 Stainless Steel with Recessed End | | Set Screw Thread Type | M | | Size Name | M3.5 x 5mm-50 PCS | | Thread Class | standard | | Thread Coverage | Fully Threaded | | Thread Size | M3.5 | | Thread Style | Right Hand | | Thread Type | Metric | | Unit Count | 50.0 Count | ## Product Details - **Exterior Finish:** Stainless Steel - **Head Style:** Headless - **Item dimensions L x W x H:** 3.5 x 1.8 x 0.7 inches - **Material:** Stainless Steel - **Thread Size:** M3.5 ## Images ![M3.5 x 5mm 50 Pcs Set Screws, Headless Concave End, Grub Screws with Internal Hex Drive, 304 Stainless Steel, Metric Thread, for Bathroom Fixtures, Towel Racks, Light Fixtures - Image 1](https://m.media-amazon.com/images/I/61uuoapAHaL.jpg) ![M3.5 x 5mm 50 Pcs Set Screws, Headless Concave End, Grub Screws with Internal Hex Drive, 304 Stainless Steel, Metric Thread, for Bathroom Fixtures, Towel Racks, Light Fixtures - Image 2](https://m.media-amazon.com/images/I/616cU1omssL.jpg) ![M3.5 x 5mm 50 Pcs Set Screws, Headless Concave End, Grub Screws with Internal Hex Drive, 304 Stainless Steel, Metric Thread, for Bathroom Fixtures, Towel Racks, Light Fixtures - Image 3](https://m.media-amazon.com/images/I/61m8r2ED2LL.jpg) ![M3.5 x 5mm 50 Pcs Set Screws, Headless Concave End, Grub Screws with Internal Hex Drive, 304 Stainless Steel, Metric Thread, for Bathroom Fixtures, Towel Racks, Light Fixtures - Image 4](https://m.media-amazon.com/images/I/71zr0t2ApBL.jpg) ![M3.5 x 5mm 50 Pcs Set Screws, Headless Concave End, Grub Screws with Internal Hex Drive, 304 Stainless Steel, Metric Thread, for Bathroom Fixtures, Towel Racks, Light Fixtures - Image 5](https://m.media-amazon.com/images/I/71gfkFw0HAL.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good Quality *by S***G on May 13, 2026* These screws work great for extending my PCB standoff. Easy to screw because it has the hexagon shape on one side ### ⭐⭐⭐⭐⭐ Stainless, well made metric solution *by C***H on July 24, 2025* Worked great, exactly what I needed! 5mm hex bit fits it perfectly, and the point is concave so that when tightened, the clamped material will not shift. ### ⭐⭐⭐⭐⭐ Fit is perfect *by J***G on January 14, 2026* Set screws look great! Threads fit perfectly into exiting thread. Wish they had a larger metric socket hex. --- ## 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.co.th/products/807403141-m3-5-x-5mm-50-pcs-set-screws-headless-concave](https://www.desertcart.co.th/products/807403141-m3-5-x-5mm-50-pcs-set-screws-headless-concave) --- *Product available on Desertcart Thailand* *Store origin: TH* *Last updated: 2026-07-26*