--- title: "Flat Head Hex Socket Screw Hexagon Socket Countersunk Head Screws DIN 7991flat Head Hex Socket Screw Hexagon Socket Countersunk Head Screws DIN 7991" description: "Flat Head Hex Socket Screw Hexagon Socket Countersunk Head Screws DIN 7991flat Head Hex… — Socket Head Cap & Allen Screws. MOQ 30,000 pieces, US$0.012." url: https://engineeringhardware.com/product/flat-head-hex-socket-screw-hexagon-socket-countersunk-head-screws-din-7991flat-head/ source: Engineering Hardware & Fasteners --- # Flat Head Hex Socket Screw Hexagon Socket Countersunk Head Screws DIN 7991flat Head Hex Socket Screw Hexagon Socket Countersunk Head Screws DIN 7991 [![Flat Head Hex Socket Screw Hexagon Socket Countersunk Head Screws DIN 7991flat Head Hex Socket Screw Hexagon Socket Countersunk Head Screws DIN 7991](https://img.engineeringhardware.com/Flat-Head-Hex-Socket-Screw-Hexagon-Socket-Countersunk-Head-Screws-DIN-7991flat-Head-Hex-Socket-Screw-Hexagon-Socket-Countersunk-Head-Screws-DIN-7991.webp)](https://img.engineeringhardware.com/Flat-Head-Hex-Socket-Screw-Hexagon-Socket-Countersunk-Head-Screws-DIN-7991flat-Head-Hex-Socket-Screw-Hexagon-Socket-Countersunk-Head-Screws-DIN-7991.webp) - Standard & made-to-drawing parts - Checked before shipping - Air, sea & express delivery [Screws › Socket Head Cap & Allen Screws](https://engineeringhardware.com/fastener-products/screws/socket-head-cap-allen-screws/) Updated 2026-11-04 · [Markdown version](https://engineeringhardware.com/product/flat-head-hex-socket-screw-hexagon-socket-countersunk-head-screws-din-7991flat-head.md) Model no. **DIN7991** US$0.012 / piece MOQ 30,000 pieces · Final price confirmed in your quote - **Material:** Stainless Steel - **Standard:** DIN, GB, ANSI, BSW, JIS, ISO - **Grade:** 10.9 - **Size 1:** M3-M20 - **Size 2:** 1/4-3/4" - **Materials:** Stainless Steel - **Package Size:** 0.50cm * 0.30cm * 0.20cm - **Diameter from M3-M30, Inch size:** 10# to 1-1/4" Get a quote [WhatsApp](https://wa.me/8615999653684?text=Hi%20Engineering%20Hardware%20%26amp%3B%20Fasteners%2C%20I%20would%20like%20a%20quote%20for%3A%20Flat%20Head%20Hex%20Socket%20Screw%20Hexagon%20Socket%20Countersunk%20Head%20Screws%20DIN%207991flat%20Head%20Hex%20Socket%20Screw%20Hexagon%20Socket%20Countersunk%20Head%20Screws%20DIN%207991%20%E2%80%94%20https%3A%2F%2Fengineeringhardware.com%2Fproduct%2Fflat-head-hex-socket-screw-hexagon-socket-countersunk-head-screws-din-7991flat-head%2F) Specifications are as listed for this product. Engineering Hardware & Fasteners confirms ratings, mating parts, compatibility, packing and lead time with you before you order. ## Specifications | Customization | Available | | --- | --- | | Material | Stainless Steel | | Type | Screw | | Model NO. | DIN7991 | | Groove | Hexagon | | Connection | Common Bolt | | Standard | DIN, GB, ANSI, BSW, JIS, ISO | | Grade | 10.9 | | Product Name | DIN7991 Socket Flat Screw | | Size 1 | M3-M20 | | Size 2 | 1/4-3/4" | | Materials | Stainless Steel | | Transport Package | Neutral Packing | | Specification | M3-M20 | | Origin | China | | HS Code | 731815 | | Production Capacity | 10 Million/Month | | Package Size | 0.50cm * 0.30cm * 0.20cm | | Package Gross Weight | 0.500kg | | Diameter from M3-M30, Inch size | 10# to 1-1/4" | | Surface Treatment | Plain (Black oxide), Zinc Plated (White/Yellow), H.D.G and etc. | | ISO9001 | 2008, SGS, ROHS | | Package | Each carton weighs 25-30KGS and contains 36-48 cartons per pallet. | | Produce Time | Standard sizes are usually in stock and can be shipped within 15-30 working days. Non-standard sizes will depend on the quantity ordered. | | Shipping Way | For orders weighing less than 100KGS, we offer shipping by air or express services such as FedEx, UPS, or DHL. If the order exceeds 100KGS, we can arrange sea shipping through our agent. If you have your own agent, we can work with them as well. | | Some of our main products include | Drop-in Anchor | | Item No | [Insert Item No] | | Style | [Insert Style] | | Logo | [Insert Logo] | | Size | [Insert Size] | | Quantity | [Insert Quantity] | | How to Get a Quotation | To receive a quotation, simply provide us with detailed information about your requirements. The more specific you are about the item number, style, logo, size, material, surface treatment, and quantity, the better. You can leave us an inquiry or email us, and we will respond promptly. | | How to Get a Free Sample | If you're interested in obtaining a free sample, we recommend using payment methods such as T/T, PayPal, or Western Union. These options are all available for your convenience. | | Here's a step-by-step guide to our order process | Send us an inquiry | | Sample | 7-10 working days (Standard) | | Bulk order | 15-30 working days (Standard) | | Category | [Socket Head Cap & Allen Screws](https://engineeringhardware.com/fastener-products/screws/socket-head-cap-allen-screws/) | ## Technical parameters | Material | 1.Stainless Steel:SS304,SS316 2.Alloy Steel | | --- | --- | | Grade | 8.8, 10.9, 12.9 | | Finish | Plain(Black oxide), Zinc Plated(White/Yellow), H.D.G and etc. | | Thread | Metric,UNC,UNF,BSW | | Standard | ISO, DIN, ASME, JIS, BS and Non-standard | | Sample Service | Samples can be in free when you confirm our price is acceptable. | | Certificate | ISO9001,CE, SGS | | Advantage | 1. Competitive price; 2. OEM service available | | Packing | 1. Bulk in cartons (25-30kg Max.)+wooden pallet 2. Small Boxes into outer carton + wooden pallet 3. According to customer special demand | | Payment terms | FOB, CIF, CFR, L/C, or others. | | Delivery method | by sea, by air or by express service | | Lead Time | 15-30 work days after order confirmed | | Application | Structural Steel; Metal Buliding; Oil&Gas; Tower&Pole; Wind Energy; Mechanical Machine; Automobile; Home Decorating and etc. | | Notes | Special specifications and marks can be made according to customers requirements; | ## Description Flat Head Hex Socket Screw Hexagon Socket Countersunk Head Screws DIN 7991flat Head Hex Socket Screw Hexagon Socket Countersunk Head Screws DIN 7991 is part of our socket head cap & allen screws range (Screws). ### Key details - **Type:** Screw - **Standard:** DIN, GB, ANSI, BSW, JIS, ISO - **Material:** Stainless Steel - **Grade:** 10.9 - **Size:** [Insert Size] - **Groove:** Hexagon - **Surface Treatment:** Plain (Black oxide), Zinc Plated (White/Yellow), H.D.G and etc. - **Connection:** Common Bolt Available configurations include material, standard, grade, size 1 and size 2. Custom sizes, threads, materials, grades, platings and packaging can be quoted on request. ### Ordering through Engineering Hardware & Fasteners Minimum order is 30,000 pieces at US$0.012 per piece. Send one inquiry with the part number, quantity and destination, and Engineering Hardware & Fasteners confirms size, thread, material, grade, finish, price, lead time and shipping, checks the goods before dispatch and ships them to you. ## Frequently asked questions ### What is the minimum order quantity (MOQ) for Flat Head Hex Socket Screw Hexagon Socket Countersunk Head Screws DIN 7991flat Head Hex Socket Screw Hexagon Socket Countersunk Head Screws DIN 7991? The listed minimum order is 30,000 pieces, at US$0.012 per piece. Smaller trial quantities or samples can be requested in your inquiry; Engineering Hardware & Fasteners confirms what is possible for your size. ### What are the main specifications of Flat Head Hex Socket Screw Hexagon Socket Countersunk Head Screws DIN 7991flat Head Hex Socket Screw Hexagon Socket Countersunk Head Screws DIN 7991? Type: Screw; Standard: DIN, GB, ANSI, BSW, JIS, ISO; Material: Stainless Steel; Grade: 10.9; Size: [Insert Size]; Groove: Hexagon. The full specification table and any technical parameter tables are listed on this page. ### Can this product be customized (OEM)? Listed configurations include material, standard, grade, size 1 and size 2. Size, thread, length, material and grade, surface finish, head marking, packaging and labels can be quoted to your specification or drawing. ### What is the lead time and how is it shipped? Lead time depends on quantity and customization and is confirmed in your quote. Engineering Hardware & Fasteners checks the goods before dispatch and ships by express, air or sea; mixed orders can be consolidated in one shipment. ### Which other socket head cap & allen screws are available? The Socket Head Cap & Allen Screws category lists 2,042 products in different sizes, materials and finishes: [https://engineeringhardware.com/fastener-products/screws/socket-head-cap-allen-screws/](https://engineeringhardware.com/fastener-products/screws/socket-head-cap-allen-screws/) How we work ## Specified, checked and shipped by Engineering Hardware & Fasteners Engineering Hardware & Fasteners supplies bolts, screws, nuts, washers, anchors, rivets and fastening hardware to equipment makers, contractors, distributors and maintenance teams. Orders go through one controlled process: size, thread, material, grade and finish confirmed, samples approved, dimensions, thread fit and plating checked before packing, then packed for export — standard or made to drawing. - DIN, ISO, ASTM, ANSI, JIS and GB standard parts - Non-standard parts made to your drawing - Dimensions, thread gauges and plating checked before packing - Export cartons and pallets, consolidated mixed orders - Samples available for approval before mass production [![Production floor](https://engineeringhardware.com/wp-content/uploads/2026/11/factory-01-production-floor-1024x683.webp)](https://engineeringhardware.com/wp-content/uploads/2026/11/factory-01-production-floor.webp) Production floor [![Inspection bench](https://engineeringhardware.com/wp-content/uploads/2026/11/factory-02-inspection-bench-768x512.webp)](https://engineeringhardware.com/wp-content/uploads/2026/11/factory-02-inspection-bench.webp) Inspection bench [![Sorting & packing](https://engineeringhardware.com/wp-content/uploads/2026/11/factory-03-sorting-and-packing-768x512.webp)](https://engineeringhardware.com/wp-content/uploads/2026/11/factory-03-sorting-and-packing.webp) Sorting & packing [![Parts warehouse](https://engineeringhardware.com/wp-content/uploads/2026/11/factory-04-parts-warehouse-768x512.webp)](https://engineeringhardware.com/wp-content/uploads/2026/11/factory-04-parts-warehouse.webp) Parts warehouse [![Sample review](https://engineeringhardware.com/wp-content/uploads/2026/11/office-02-office-sample-review-768x512.webp)](https://engineeringhardware.com/wp-content/uploads/2026/11/office-02-office-sample-review.webp) Sample review [![Sales office](https://engineeringhardware.com/wp-content/uploads/2026/11/office-01-daily-sales-office-768x512.webp)](https://engineeringhardware.com/wp-content/uploads/2026/11/office-01-daily-sales-office.webp) Sales office [More about us →](https://engineeringhardware.com/about/) · [Request a sample or custom quote →](https://engineeringhardware.com/contact/) ## Request a quote for this product ## Related products [All Socket Head Cap & Allen Screws →](https://engineeringhardware.com/fastener-products/screws/socket-head-cap-allen-screws/) [![Hex Socket Cap Screws Half Thread DIN 912 Grade 8.8 Knurled Head](https://img.engineeringhardware.com/Hex-Socket-Cap-Screws-Half-Thread-DIN-912-Grade-8-8-Knurled-Head.webp)](https://engineeringhardware.com/product/hex-socket-cap-screws-half-thread-din-912-grade-8-8-knurled-head/) Socket Head Cap & Allen Screws ### [Hex Socket Cap Screws Half Thread DIN 912 Grade 8.8 Knurled Head](https://engineeringhardware.com/product/hex-socket-cap-screws-half-thread-din-912-grade-8-8-knurled-head/) Hexagon Head · DIN, GB, ANSI, BSW, JIS, GOST, DIN/GB/ISO/JIS B/BS/Ansl… **US$0.12 – 0.60**MOQ 100 pieces [![Factory Outlet, Stainless Steel Screws, Carbon Steel Hex Socket Flat Head Cap Screws, American Standard Machine 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Design](https://img.engineeringhardware.com/DIN7984-Hex-Socket-Head-Screw-Stainless-Steel-with-Countersunk-Design.webp)](https://engineeringhardware.com/product/din7984-hex-socket-head-screw-stainless-steel-with-countersunk-design/) Socket Head Cap & Allen Screws ### [DIN7984 Hex Socket Head Screw Stainless Steel with Countersunk Design](https://engineeringhardware.com/product/din7984-hex-socket-head-screw-stainless-steel-with-countersunk-design/) Round Head · DIN, ANSI, GB **US$0.005 – 0.0054**MOQ 3,000 pieces **US$0.012**MOQ 30,000 piecesGet a 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