--- title: "Durable DIN7991 Hex Socket Screws for Flat Head Applications" description: "Durable DIN7991 Hex Socket Screws for Flat Head Applications — Socket Head Cap & Allen Screws. MOQ 1,000 pieces, US$0.012 – 0.12." url: https://engineeringhardware.com/product/durable-din7991-hex-socket-screws-for-flat-head-applications/ source: Engineering Hardware & Fasteners --- # Durable DIN7991 Hex Socket Screws for Flat Head Applications [![Durable DIN7991 Hex Socket Screws for Flat Head Applications](https://img.engineeringhardware.com/Durable-DIN7991-Hex-Socket-Screws-for-Flat-Head-Applications.webp)](https://img.engineeringhardware.com/Durable-DIN7991-Hex-Socket-Screws-for-Flat-Head-Applications.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/durable-din7991-hex-socket-screws-for-flat-head-applications.md) Model no. **DIN7991** US$0.012 – 0.12 / piece MOQ 1,000 pieces · Final price confirmed in your quote - **Material:** Stainless Steel - **Head Style:** Counter Sunk Bolt - **Standard:** DIN - **Grade:** A2-70/A4-80 - **Finish:** Plain - **Model Number:** DIN7991 - **Head Type:** Csk Head - **Size:** M1.6-M16 Get a quote [WhatsApp](https://wa.me/8615999653684?text=Hi%20Engineering%20Hardware%20%26amp%3B%20Fasteners%2C%20I%20would%20like%20a%20quote%20for%3A%20Durable%20DIN7991%20Hex%20Socket%20Screws%20for%20Flat%20Head%20Applications%20%E2%80%94%20https%3A%2F%2Fengineeringhardware.com%2Fproduct%2Fdurable-din7991-hex-socket-screws-for-flat-head-applications%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 | Countersunk Head | | Model NO. | DIN7991 | | Groove | Hexagon | | Head Style | Counter Sunk Bolt | | Standard | DIN | | Grade | A2-70/A4-80 | | Finish | Plain | | Place of Origin | Jiangsu, China | | Model Number | DIN7991 | | Head Type | Csk Head | | Size | M1.6-M16 | | Color | Silvery | | Certificate | CE;ISO9001 | | Length | 3-160mm | | Measurement | Metric | | Specification | M1.6-M16 | | Origin | Taizhou | | HS Code | 7318159090 | | Production Capacity | 15tons/Month | | Package Size | 36.00cm * 26.00cm * 16.00cm | | Package Gross Weight | 0.880kg | | Product name | Hex Socket Flat Head Screw | | Stainless steel screws have the following characteristics | strong corrosion resistance, good high-temperature resistance, easy installation, durable, beautiful. | | The factory mainly produces curtain wall accessories | aluminum alloy pendant, stainless steel back bolt, curtain wall spring pin, wedge anchor bolt. | | Stainless steel standard parts | 201 and 304 and 316 stainless steel self tapping screws, machine screws, self drilling screws and other product. | | Machine thread | when assembling, drill holes and tap teeth on the assembly first. The tapped inner teeth have the same specifications as the outer teeth of the screw, and assemble with small torque. | | Self tapping thread | When assembling, drill holes on the assembly first, do not need to tap the inner teeth, and use large torque assembly. | | Self drilling thread | directly used on the assembly, screw drilling and tapping molding. | | Category | [Socket Head Cap & Allen Screws](https://engineeringhardware.com/fastener-products/screws/socket-head-cap-allen-screws/) | ## Technical parameters | Product name: | Hex Socket Flat Head Screw | | --- | --- | | Material: | Stainless Steel | | Size: | M3-M6 | | Finish: | Polish | ## Description Durable DIN7991 Hex Socket Screws for Flat Head Applications is part of our socket head cap & allen screws range (Screws). ### Key details - **Type:** Countersunk Head - **Standard:** DIN - **Material:** Stainless Steel - **Grade:** A2-70/A4-80 - **Size:** M1.6-M16 - **Length:** 3-160mm - **Head Type:** Csk Head - **Head Style:** Counter Sunk Bolt Available configurations include material, head style, standard, grade and finish. Custom sizes, threads, materials, grades, platings and packaging can be quoted on request. ### Ordering through Engineering Hardware & Fasteners Minimum order is 1,000 pieces at US$0.012 – 0.12 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 Durable DIN7991 Hex Socket Screws for Flat Head Applications? The listed minimum order is 1,000 pieces, at US$0.012 – 0.12 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 Durable DIN7991 Hex Socket Screws for Flat Head Applications? Type: Countersunk Head; Standard: DIN; Material: Stainless Steel; Grade: A2-70/A4-80; Size: M1.6-M16; Length: 3-160mm. The full specification table and any technical parameter tables are listed on this page. ### Can this product be customized (OEM)? Listed configurations include material, head style, standard, grade and finish. 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 & 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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/) [![Galvanized Carbon Steel Hex Socket Flat Head Confirmat Screw/Furniture Screws](https://img.engineeringhardware.com/Galvanized-Carbon-Steel-Hex-Socket-Flat-Head-Confirmat-Screw-Furniture-Screws.webp)](https://engineeringhardware.com/product/galvanized-carbon-steel-hex-socket-flat-head-confirmat-screw-furniture-screws/) Socket Head Cap & Allen Screws ### [Galvanized Carbon Steel Hex Socket Flat Head Confirmat Screw/Furniture Screws](https://engineeringhardware.com/product/galvanized-carbon-steel-hex-socket-flat-head-confirmat-screw-furniture-screws/) Hex Socket Flat Head · DIN, GB, ANSI, Customized **US$0.042**MOQ 10,000 pieces [![DIN 7991 Hex Socket Countersunk Flat Head Cap Screws Stainless Steel 304 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quote[WA](https://wa.me/8615999653684?text=Hi%20Engineering%20Hardware%20%26amp%3B%20Fasteners%2C%20I%20would%20like%20a%20quote%20for%3A%20Durable%20DIN7991%20Hex%20Socket%20Screws%20for%20Flat%20Head%20Applications%20%E2%80%94%20https%3A%2F%2Fengineeringhardware.com%2Fproduct%2Fdurable-din7991-hex-socket-screws-for-flat-head-applications%2F)