--- title: "DIN 7991 Hexagon Socket Countersunk Head Cap Screws, Black Finished." description: "DIN 7991 Hexagon Socket Countersunk Head Cap Screws, Black Finished. — Countersunk & Flat-Head Machine Screws. MOQ 3,000 pieces, US$0.024 – 0.096." url: https://engineeringhardware.com/product/din-7991-hexagon-socket-countersunk-head-cap-screws-black-finished/ source: Engineering Hardware & Fasteners --- # DIN 7991 Hexagon Socket Countersunk Head Cap Screws, Black Finished. [![DIN 7991 Hexagon Socket Countersunk Head Cap Screws, Black Finished.](https://img.engineeringhardware.com/DIN-7991-Hexagon-Socket-Countersunk-Head-Cap-Screws-Black-Finished.webp)](https://img.engineeringhardware.com/DIN-7991-Hexagon-Socket-Countersunk-Head-Cap-Screws-Black-Finished.webp) - Standard & made-to-drawing parts - Checked before shipping - Air, sea & express delivery [Screws › Countersunk & Flat-Head Machine Screws](https://engineeringhardware.com/fastener-products/screws/countersunk-flat-head-machine-screws/) Updated 2026-11-04 · [Markdown version](https://engineeringhardware.com/product/din-7991-hexagon-socket-countersunk-head-cap-screws-black-finished.md) Model no. **M6X30** | **US$0.096**3,000–9,999 pieces | **US$0.06**10,000–49,999 pieces | **US$0.036**50,000–99,999 pieces | **US$0.024**100,000+ pieces | | --- | --- | --- | --- | MOQ 3,000 pieces · Final price confirmed in your quote - **Material:** Carbon Steel - **Head Style:** Hexagonal - **Standard:** DIN, ANSI, JIS, BSW, GOST - **Grade:** 10.9 - **Finish:** Black - **Standard parts:** 7- - **Non-standard parts:** 25 Get a quote [WhatsApp](https://wa.me/8615999653684?text=Hi%20Engineering%20Hardware%20%26amp%3B%20Fasteners%2C%20I%20would%20like%20a%20quote%20for%3A%20DIN%207991%20Hexagon%20Socket%20Countersunk%20Head%20Cap%20Screws%2C%20Black%20Finished.%20%E2%80%94%20https%3A%2F%2Fengineeringhardware.com%2Fproduct%2Fdin-7991-hexagon-socket-countersunk-head-cap-screws-black-finished%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 | Carbon Steel | | Type | Hexagon Head | | Model NO. | M6X30 | | Connection | Common Bolt | | Head Style | Hexagonal | | Standard | DIN, ANSI, JIS, BSW, GOST | | Grade | 10.9 | | Application | Machinery, Chemical Industry, Environmental | | Finish | Black | | Transport Package | Approx 25kg/Carton, 36 Carton/Pallet. | | Specification | DIN7991, GB, Jisb, ISO, ANSI/Asme B, W. S. W | | Origin | China | | HS Code | 7318160000 | | Production Capacity | 3000 Tons Per Year | | ABOUT US | Wellbolt is an excellent fasteners & metal production manufacturer and exporter in China,from the beginning of the production of bolts and screws, established its full range fastener distribution line 3 years later. | | All our processes strictly adhere to ISO9001 | 2008 procedures. We have strict quality control from producing to | | Standard parts | 7- | | Non-standard parts | 25 | | Category | [Countersunk & Flat-Head Machine Screws](https://engineeringhardware.com/fastener-products/screws/countersunk-flat-head-machine-screws/) | ## Technical parameters | Product | DIN7991 Hex Socket Countersunk Head Cap screws | | --- | --- | | Grade | Grade 4.8, 8.8, 10.9,12.9, A2-70,A4-80 | | Material | Carbon Steel, Alloy Steel, Stainless Steel, Aluminum, Brass | | Coating | Galvanized, Black Oxide, Dacromet, etc | | Size | M3-M24 | | Packing | Small box, Bags, Carton | | Screw Thread d | M3 | M4 | M5 | M6 | M8 | M10 | M12 | (M14) | M16 | (M18) | M20 | (M22) | M24 | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | P | Pitch | 0.5 | 0.7 | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 | 2.5 | 2.5 | 2.5 | 3 | | α | tol.(+2) | 90° | 90° | 90° | 90° | 90° | 90° | 90° | 90° | 90° | 90° | 90° | 60° | 60° | | b | L≤125 | 12 | 14 | 16 | 18 | 22 | 26 | 30 | 34 | 38 | 42 | 46 | 50 | 54 | | 125 | / | / | / | 24 | 28 | 32 | 36 | 40 | 44 | 48 | 52 | 56 | 60 | | | L>200 | / | / | / | / | / | 45 | 49 | 53 | 57 | 61 | 65 | 69 | 73 | | | dk | max=nominal size | 6 | 8 | 10 | 12 | 16 | 20 | 24 | 27 | 30 | 33 | 36 | 36 | 39 | | min | 5.7 | 7.64 | 9.64 | 11.57 | 15.57 | 19.48 | 23.48 | 26.48 | 29.48 | 32.38 | 35.38 | 35.38 | 38.38 | | | ds | max=nominal size | 3 | 4 | 5 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 22 | 24 | | min | 2.86 | 3.82 | 4.82 | 5.82 | 7.78 | 9.78 | 11.73 | 13.73 | 15.73 | 17.73 | 19.67 | 21.67 | 23.67 | | | e | min | 2.3 | 2.87 | 3.44 | 4.58 | 5.72 | 6.86 | 9.15 | 11.43 | 11.43 | 13.72 | 13.72 | 16 | 16 | | k | max | 1.7 | 2.3 | 2.8 | 3.3 | 4.4 | 5.5 | 6.5 | 7 | 7.5 | 8 | 8.5 | 13.1 | 14 | | s | Nominal Size | 2 | 2.5 | 3 | 4 | 5 | 6 | 8 | 10 | 10 | 12 | 12 | 14 | 14 | | min | 2.02 | 2.52 | 3.02 | 4.02 | 5.02 | 6.02 | 8.025 | 10.025 | 10.025 | 12.032 | 12.032 | 14.032 | 14.032 | | | max | 2.1 | 2.6 | 3.1 | 4.12 | 5.14 | 6.14 | 8.175 | 10.175 | 10.175 | 12.212 | 12.212 | 14.212 | 14.212 | | | t | max=nominal size | 1.2 | 1.8 | 2.3 | 2.5 | 3.5 | 4.4 | 4.6 | 4.8 | 5.3 | 5.5 | 5.9 | 8.8 | 10.3 | | min | 0.95 | 1.55 | 2.05 | 2.25 | 3.2 | 4.1 | 4.3 | 4.5 | 5 | 5.2 | 5.6 | 8.44 | 9.87 | | ## Description DIN 7991 Hexagon Socket Countersunk Head Cap Screws, Black Finished. is part of our countersunk & flat-head machine screws range (Screws). ### Key details - **Type:** Hexagon Head - **Standard:** DIN, ANSI, JIS, BSW, GOST - **Material:** Carbon Steel - **Grade:** 10.9 - **Head Style:** Hexagonal - **Finish:** Black - **Connection:** Common Bolt - **Application:** Machinery, Chemical Industry, Environmental 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 3,000 pieces at US$0.024 – 0.096 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 DIN 7991 Hexagon Socket Countersunk Head Cap Screws, Black Finished.? The listed minimum order is 3,000 pieces, at US$0.024 – 0.096 per piece. Smaller trial quantities or samples can be requested in your inquiry; Engineering Hardware & Fasteners confirms what is possible for your size. ### How does the price change with quantity? Volume pricing: US$0.096 for 3,000–9,999 pieces; US$0.06 for 10,000–49,999 pieces; US$0.036 for 50,000–99,999 pieces; US$0.024 for 100,000+ pieces. Final prices depend on size, material, finish and packing and are confirmed in your quote. ### What are the main specifications of DIN 7991 Hexagon Socket Countersunk Head Cap Screws, Black Finished.? Type: Hexagon Head; Standard: DIN, ANSI, JIS, BSW, GOST; Material: Carbon Steel; Grade: 10.9; Head Style: Hexagonal; Finish: Black. 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 countersunk & flat-head machine screws are available? The Countersunk & Flat-Head Machine Screws category lists 2,424 products in different sizes, materials and finishes: [https://engineeringhardware.com/fastener-products/screws/countersunk-flat-head-machine-screws/](https://engineeringhardware.com/fastener-products/screws/countersunk-flat-head-machine-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 Countersunk & Flat-Head Machine Screws →](https://engineeringhardware.com/fastener-products/screws/countersunk-flat-head-machine-screws/) [![DIN6319 Gr1 Gr2 Titanium Flat Plain Countersunk Umbrella Washer Fastener Supplier](https://img.engineeringhardware.com/DIN6319-Gr1-Gr2-Titanium-Flat-Plain-Countersunk-Umbrella-Washer-Fastener-Supplier.webp)](https://engineeringhardware.com/product/din6319-gr1-gr2-titanium-flat-plain-countersunk-umbrella-washer-fastener-supplier/) Countersunk & Flat-Head Machine Screws ### [DIN6319 Gr1 Gr2 Titanium Flat Plain Countersunk Umbrella Washer Fastener Supplier](https://engineeringhardware.com/product/din6319-gr1-gr2-titanium-flat-plain-countersunk-umbrella-washer-fastener-supplier/) Round Head · DIN, ANSI, GB, JIS, GOST, BSW **US$0.012 – 0.024**MOQ 1,000 pieces [![Cross Recessed Large Flat Head Extra Large Umbrella Head Machine 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3,000 piecesGet a quote[WA](https://wa.me/8615999653684?text=Hi%20Engineering%20Hardware%20%26amp%3B%20Fasteners%2C%20I%20would%20like%20a%20quote%20for%3A%20DIN%207991%20Hexagon%20Socket%20Countersunk%20Head%20Cap%20Screws%2C%20Black%20Finished.%20%E2%80%94%20https%3A%2F%2Fengineeringhardware.com%2Fproduct%2Fdin-7991-hexagon-socket-countersunk-head-cap-screws-black-finished%2F)