--- title: "DIN7991 Hex Socket Countersunk Head Cap Screws" description: "DIN7991 Hex Socket Countersunk Head Cap Screws — Socket Head Cap & Allen Screws. Material: Carbon Steel, Standard: DIN, GB. MOQ 1,000 pieces, US$0.012." url: https://engineeringhardware.com/product/din7991-hex-socket-countersunk-head-cap-screws/ source: Engineering Hardware & Fasteners --- # DIN7991 Hex Socket Countersunk Head Cap Screws [![DIN7991 Hex Socket Countersunk Head Cap Screws](https://img.engineeringhardware.com/DIN7991-Hex-Socket-Countersunk-Head-Cap-Screws.webp)](https://img.engineeringhardware.com/DIN7991-Hex-Socket-Countersunk-Head-Cap-Screws.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/din7991-hex-socket-countersunk-head-cap-screws.md) Model no. **M3-M24** US$0.012 / piece MOQ 1,000 pieces · Final price confirmed in your quote - **Material:** Carbon Steel - **Head Style:** Counter Sunk Bolt - **Standard:** DIN, GB - **Grade:** 12.9 - **Finish:** Hot Galvanizing - **Diameter:** 3-24mm - **Length:** 8mm-300mm - **Coating:** Black, Zp, HDG, etc Get a quote [WhatsApp](https://wa.me/8615999653684?text=Hi%20Engineering%20Hardware%20%26amp%3B%20Fasteners%2C%20I%20would%20like%20a%20quote%20for%3A%20DIN7991%20Hex%20Socket%20Countersunk%20Head%20Cap%20Screws%20%E2%80%94%20https%3A%2F%2Fengineeringhardware.com%2Fproduct%2Fdin7991-hex-socket-countersunk-head-cap-screws%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 | Countersunk Head | | Model NO. | M3-M24 | | Connection | Common Bolt | | Head Style | Counter Sunk Bolt | | Standard | DIN, GB | | Grade | 12.9 | | Application | Machinery | | Finish | Hot Galvanizing | | Diameter | 3-24mm | | Length | 8mm-300mm | | Coating | Black, Zp, HDG, etc | | Delivery Time | 30 Days | | Transport Package | 25 Kg of Hex Head Bolt/ Carton, 36 Cartons/Pallet. | | Specification | DIN7991 | | Origin | China | | HS Code | 7318150000 | | Production Capacity | 3000 Tons Hex Head Bolts 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 | [Socket Head Cap & Allen Screws](https://engineeringhardware.com/fastener-products/screws/socket-head-cap-allen-screws/) | ## Technical parameters | 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 DIN7991 Hex Socket Countersunk Head Cap Screws is part of our socket head cap & allen screws range (Screws). ### Key details - **Type:** Countersunk Head - **Standard:** DIN, GB - **Material:** Carbon Steel - **Grade:** 12.9 - **Diameter:** 3-24mm - **Length:** 8mm-300mm - **Head Style:** Counter Sunk Bolt - **Finish:** Hot Galvanizing 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 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 DIN7991 Hex Socket Countersunk Head Cap Screws? The listed minimum order is 1,000 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 DIN7991 Hex Socket Countersunk Head Cap Screws? Type: Countersunk Head; Standard: DIN, GB; Material: Carbon Steel; Grade: 12.9; Diameter: 3-24mm; Length: 8mm-300mm. 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/) [![Malaxy Alloy Steel DIN 912 Socket Cap Screws Black Anodized Cylinder Head Hexagon Socket Head Cap Screws](https://img.engineeringhardware.com/Malaxy-Alloy-Steel-DIN-912-Socket-Cap-Screws-Black-Anodized-Cylinder-Head-Hexagon-Socket-Head-Cap-Screws.webp)](https://engineeringhardware.com/product/malaxy-alloy-steel-din-912-socket-cap-screws-black-anodized-cylinder-head-hexagon/) Socket Head Cap & Allen Screws ### [Malaxy Alloy Steel DIN 912 Socket Cap Screws Black Anodized Cylinder Head Hexagon Socket Head Cap Screws](https://engineeringhardware.com/product/malaxy-alloy-steel-din-912-socket-cap-screws-black-anodized-cylinder-head-hexagon/) Round Head · DIN, GB, ANSI, BSW, JIS, GOST **US$0.012 – 0.036**MOQ 1 piece [![Factory Supply Free Sample DIN 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Screws](https://engineeringhardware.com/product/black-oxide-iso-7379-hexagon-socket-head-shoulder-screws/) Hexagon Head · DIN, ANSI, GB, JIS, GOST, BSW **US$0.012 – 0.12**MOQ 1 piece **US$0.012**MOQ 1,000 piecesGet a quote[WA](https://wa.me/8615999653684?text=Hi%20Engineering%20Hardware%20%26amp%3B%20Fasteners%2C%20I%20would%20like%20a%20quote%20for%3A%20DIN7991%20Hex%20Socket%20Countersunk%20Head%20Cap%20Screws%20%E2%80%94%20https%3A%2F%2Fengineeringhardware.com%2Fproduct%2Fdin7991-hex-socket-countersunk-head-cap-screws%2F)