---
title: "DIN7991 Brass Hexagon Hex Socket Flat Countersunk Head Screw DIN 7991"
description: "DIN7991 Brass Hexagon Hex Socket Flat Countersunk Head Screw DIN 7991 — Socket Head Cap & Allen Screws. MOQ 10,000 pieces, US$0.0024 – 0.12."
url: https://engineeringhardware.com/product/din7991-brass-hexagon-hex-socket-flat-countersunk-head-screw-din-7991/
source: Engineering Hardware & Fasteners
---

# DIN7991 Brass Hexagon Hex Socket Flat Countersunk Head Screw DIN 7991

[![DIN7991 Brass Hexagon Hex Socket Flat Countersunk Head Screw DIN 7991](https://img.engineeringhardware.com/DIN7991-Brass-Hexagon-Hex-Socket-Flat-Countersunk-Head-Screw-DIN-7991.webp)](https://img.engineeringhardware.com/DIN7991-Brass-Hexagon-Hex-Socket-Flat-Countersunk-Head-Screw-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/din7991-brass-hexagon-hex-socket-flat-countersunk-head-screw-din-7991.md)

Model no. **DIN 7991**

| **US$0.12**10,000–49,999 pieces | **US$0.06**50,000–99,999 pieces | **US$0.0024**100,000+ pieces |
| --- | --- | --- |

MOQ 10,000 pieces · Final price confirmed in your quote

- **Material:** Brass
- **Head Style:** Counter Sunk Bolt
- **Standard:** DIN, GB, ANSI, BSW, JIS, ISO
- **Grade:** 8.8
- **Thread:** Unc, Unf, Un, Metric Coarse, Fine
- **Surface:** Plain, Zinc Plated (Blue, White, Black, Yellow), N
- **Exterior Finish:** Customized
- **Customized:** Available

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%20Brass%20Hexagon%20Hex%20Socket%20Flat%20Countersunk%20Head%20Screw%20DIN%207991%20%E2%80%94%20https%3A%2F%2Fengineeringhardware.com%2Fproduct%2Fdin7991-brass-hexagon-hex-socket-flat-countersunk-head-screw-din-7991%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 | Brass |
| Type | Countersunk Head |
| Model NO. | DIN 7991 |
| Groove | Hexagon |
| Connection | Common Bolt |
| Head Style | Counter Sunk Bolt |
| Standard | DIN, GB, ANSI, BSW, JIS, ISO |
| Grade | 8.8 |
| Thread | Unc, Unf, Un, Metric Coarse, Fine |
| Surface | Plain, Zinc Plated (Blue, White, Black, Yellow), N |
| Quality | 100% Tested |
| Price | Factory Price |
| Lead Time | 15-30 Days |
| Package | Standard Package or Customer's Packing |
| Box | Customer's Brand Box/Plain Box |
| MOQ | Can Be Negotiated |
| Shipment | by Sea / Truck / Plane / Express |
| Exterior Finish | Customized |
| Sample | Available |
| Customized | Available |
| Service | One-Stop Service |
| Online Sales | 24 Hours Online |
| OEM/ODM | Available |
| Transport Package | Bulk Packaging, Small Box(Glue Box, Color Box) |
| Specification | M3 - M24 |
| Origin | Ningbo, China |
| HS Code | 7318159001 |
| Production Capacity | 1000tons Per Month |
| Package Size | 10.00cm * 10.00cm * 5.00cm |
| Package Gross Weight | 0.500kg |
| Standards | GB, DIN, ISO, ANSI/ASTM, BS, BSW, JIS, ETC |
| Size | M3-M24 or non-standard asa request & design |
| Finish | Plain, Black, Zinc, Yellow Zinc, HDG, Dacromet, etc. |
| Category | [Socket Head Cap & Allen Screws](https://engineeringhardware.com/fastener-products/screws/socket-head-cap-allen-screws/) |

## Technical parameters

| Hex Socket Countersunk Head Screw |  |
| --- | --- |
| Material: | Carbon Steel, Stainless Steel, Brass etc. |
| Standards: | GB, DIN, ISO, ANSI/ASTM, BS, BSW, JIS, ETC |
| Size: | M3-M24 or non-standard asa request & design |
| Finish: | Plain, Black, Zinc, Yellow Zinc, HDG, Dacromet, etc. |

| Screw Threadd | 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 |  |

| A1: Our screws comply with DIN, ISO, ANSI, and JIS standards, and can also be customized according to customer drawings. |
| --- |
| A2: We supply multiple grades including A2-70, A2-80, A4-70, A4-80, 304, 316, and 410SS, suitable for different mechanical strength and corrosion-resistance requirements. |
| A3: Yes, we offer free or low-cost samples for quality and dimension confirmation prior to order. |
| A4: Every batch is tested for torque, hardness, thread precision, and salt spray corrosion resistance, following ISO 9001 quality system standards. |
| A5: Yes. We can produce screws according to samples, technical drawings, or specific drive/head combinations, and offer custom packaging and labeling. |
| A6: A2 (304) is ideal for standard outdoor and industrial use, while A4 (316) contains molybdenum, offering higher corrosion resistance for marine, chemical, and salt-spray environments. |
| A7: Under severe chemical or chloride exposure, A2 may develop slight surface corrosion. A4/316 performs better in harsh environments. We also offer passivation treatment for enhanced protection. |

## Description

DIN7991 Brass Hexagon Hex Socket Flat Countersunk Head Screw DIN 7991 is part of our socket head cap & allen screws range (Screws).

### Key details

- **Type:** Countersunk Head
- **Standard:** DIN, GB, ANSI, BSW, JIS, ISO
- **Material:** Brass
- **Grade:** 8.8
- **Size:** M3-M24 or non-standard asa request & design
- **Thread:** Unc, Unf, Un, Metric Coarse, Fine
- **Head Style:** Counter Sunk Bolt
- **Groove:** Hexagon

Available configurations include material, head style, standard, grade and thread. Custom sizes, threads, materials, grades, platings and packaging can be quoted on request.

### Ordering through Engineering Hardware & Fasteners

Minimum order is 10,000 pieces at US$0.0024 – 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 DIN7991 Brass Hexagon Hex Socket Flat Countersunk Head Screw DIN 7991?

The listed minimum order is 10,000 pieces, at US$0.0024 – 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.

### How does the price change with quantity?

Volume pricing: US$0.12 for 10,000–49,999 pieces; US$0.06 for 50,000–99,999 pieces; US$0.0024 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 DIN7991 Brass Hexagon Hex Socket Flat Countersunk Head Screw DIN 7991?

Type: Countersunk Head; Standard: DIN, GB, ANSI, BSW, JIS, ISO; Material: Brass; Grade: 8.8; Size: M3-M24 or non-standard asa request & design; Thread: Unc, Unf, Un, Metric Coarse, Fine. 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 thread. 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

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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

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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

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**US$0.0024 – 0.12**MOQ 10,000 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%20Brass%20Hexagon%20Hex%20Socket%20Flat%20Countersunk%20Head%20Screw%20DIN%207991%20%E2%80%94%20https%3A%2F%2Fengineeringhardware.com%2Fproduct%2Fdin7991-brass-hexagon-hex-socket-flat-countersunk-head-screw-din-7991%2F)