---
title: "DIN 7991 Hexagon Socket Countersunk Head Cap Screws"
description: "DIN 7991 Hexagon Socket Countersunk Head Cap Screws — Countersunk & Flat-Head Machine Screws. MOQ 1,000 pieces, US$0.36 – 1.20."
url: https://engineeringhardware.com/product/din-7991-hexagon-socket-countersunk-head-cap-screws-2/
source: Engineering Hardware & Fasteners
---

# DIN 7991 Hexagon Socket Countersunk Head Cap Screws

[![DIN 7991 Hexagon Socket Countersunk Head Cap Screws](https://img.engineeringhardware.com/DIN-7991-Hexagon-Socket-Countersunk-Head-Cap-Screws.webp)](https://img.engineeringhardware.com/DIN-7991-Hexagon-Socket-Countersunk-Head-Cap-Screws.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-2.md)

Model no. **DIN 7991**

| **US$1.20**1,000–9,999 pieces | **US$0.60**10,000–99,999 pieces | **US$0.36**100,000+ pieces |
| --- | --- | --- |

MOQ 1,000 pieces · Final price confirmed in your quote

- **Material:** High Strength Steel
- **Head Style:** Hexagonal
- **Standard:** DIN, ANSI, GB, JIS, GOST
- **Grade:** 8.8
- **Finish:** Hot Galvanizing
- **Standard for Size:** DIN 7991
- **Standard Name:** ISO 10642
- **Material Grade:** 8.8, 10.9, A2-80, A4-80

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%20%E2%80%94%20https%3A%2F%2Fengineeringhardware.com%2Fproduct%2Fdin-7991-hexagon-socket-countersunk-head-cap-screws-2%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 | High Strength Steel |
| Type | Hexagon Head |
| Model NO. | DIN 7991 |
| Connection | Common Bolt |
| Head Style | Hexagonal |
| Standard | DIN, ANSI, GB, JIS, GOST |
| Grade | 8.8 |
| Application | Machinery, Chemical Industry, Environmental, Building |
| Finish | Hot Galvanizing |
| Product Name | Hexagon Socket Countersunk Head Cap Screws |
| Standard for Size | DIN 7991 |
| Standard Name | ISO 10642 |
| Material Grade | 8.8, 10.9, A2-80, A4-80 |
| Diameter Range | M3 - M24 |
| Inch Diameter Range | 0# to 1-1/2" |
| Transport Package | Pallet |
| Specification | 25cm x 25cm x 15cm |
| Origin | Shanghai |
| HS Code | 7318159090 |
| Production Capacity | 10000 Tons Per Year |
| Package Size | 25.00cm * 25.00cm * 15.00cm |
| Package Gross Weight | 25.000kg |
| Fasteners - Stud bolts - Part 1 | Metric thread |
| Category | [Countersunk & Flat-Head Machine Screws](https://engineeringhardware.com/fastener-products/screws/countersunk-flat-head-machine-screws/) |

## Technical parameters

| M3 | M4 | M5 | M6 | M8 | M10 | M12 | (M14) | M16 | (M18) | M20 | (M22) | M24 |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |

| P | Pitch |
| --- | --- |
| α | tol.(+2) |
| b | L≤125 |
| 125 |  |
| L>200 |  |
| dk | max=nominal size |
| min |  |
| ds | max=nominal size |
| min |  |
| e | min |
| k | max |
| s | Nominal Size |
| min |  |
| max |  |
| t | max=nominal size |
| min |  |

| 0.5 | 0.7 | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 | 2.5 | 2.5 | 2.5 | 3 |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 90° | 90° | 90° | 90° | 90° | 90° | 90° | 90° | 90° | 90° | 90° | 60° | 60° |
| 12 | 14 | 16 | 18 | 22 | 26 | 30 | 34 | 38 | 42 | 46 | 50 | 54 |
| / | / | / | 24 | 28 | 32 | 36 | 40 | 44 | 48 | 52 | 56 | 60 |
| / | / | / | / | / | 45 | 49 | 53 | 57 | 61 | 65 | 69 | 73 |
| 6 | 8 | 10 | 12 | 16 | 20 | 24 | 27 | 30 | 33 | 36 | 36 | 39 |
| 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 |
| 3 | 4 | 5 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 22 | 24 |
| 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 |
| 2.3 | 2.87 | 3.44 | 4.58 | 5.72 | 6.86 | 9.15 | 11.43 | 11.43 | 13.72 | 13.72 | 16 | 16 |
| 1.7 | 2.3 | 2.8 | 3.3 | 4.4 | 5.5 | 6.5 | 7 | 7.5 | 8 | 8.5 | 13.1 | 14 |
| 2 | 2.5 | 3 | 4 | 5 | 6 | 8 | 10 | 10 | 12 | 12 | 14 | 14 |
| 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 |
| 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 |
| 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 |
| 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 |

| 0# | 1# | 2# | 3# | 4# | 5# | 6# | 8# | 10# | 12# | 1/4 | 5/16 |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |

| d | Nominal Diameter |
| --- | --- |
| PP | UNC |
| UNF |  |
| UNEF |  |
| ds | max |
| min |  |
| dk | max |
| min |  |
| k | Ref |
| s | Nominal Size |
| Nominal Size |  |
| t | min |
| b | min |
| α | ±2° |

| 0.06 | 0.073 | 0.086 | 0.099 | 0.112 | 0.125 | 0.138 | 0.164 | 0.19 | 0.2158 | 0.25 | 0.3125 |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| - | 64 | 56 | 48 | 40 | 40 | 32 | 32 | 24 | 24 | 20 | 18 |
| 80 | 72 | 64 | 56 | 48 | 44 | 40 | 36 | 32 | 28 | 28 | 24 |
| - | - | - | - | - | - | - | - | - | 32 | 32 | 32 |
| 0.06 | 0.073 | 0.086 | 0.099 | 0.112 | 0.125 | 0.138 | 0.164 | 0.19 | 0.2158 | 0.25 | 0.3125 |
| 0.0568 | 0.0695 | 0.0822 | 0.0949 | 0.1075 | 0.1202 | 0.1329 | 0.1585 | 0.184 | 0.2102 | 0.2435 | 0.3053 |
| 0.138 | 0.168 | 0.197 | 0.226 | 0.255 | 0.281 | 0.307 | 0.359 | 0.411 | 0.45 | 0.531 | 0.656 |
| 0.117 | 0.143 | 0.168 | 0.193 | 0.218 | 0.24 | 0.263 | 0.311 | 0.359 | 0.41 | 0.48 | 0.6 |
| 0.044 | 0.054 | 0.064 | 0.073 | 0.083 | 0.09 | 0.097 | 0.112 | 0.127 | 0.135 | 0.161 | 0.198 |
| - | - | - | 1/16 | 1/16 | 5/64 | 5/64 | 3/32 | 1/8 | 1/8 | 5/32 | 3/16 |
| 0.035 | 0.05 | 0.05 | 0.062 | 0.062 | 0.078 | 0.078 | 0.094 | 0.125 | 0.125 | 0.156 | 0.188 |
| 0.025 | 0.031 | 0.038 | 0.044 | 0.055 | 0.061 | 0.066 | 0.076 | 0.087 | 0.094 | 0.111 | 0.135 |
| 0.5 | 0.62 | 0.62 | 0.62 | 0.75 | 0.75 | 0.75 | 0.88 | 0.88 | 0.88 | 1 | 1.12 |
| 82° | 82° | 82° | 82° | 82° | 82° | 82° | 82° | 82° | 82° | 82° | 82° |

| 3/8 | 7/16 | 1/2 | 5/8 | 3/4 | 7/8 | 1 | 1-1/8 | 1-1/4 | 1-3/8 | 1-1/2 |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |

| d | Nominal Diameter |
| --- | --- |
| PP | UNC |
| UNF |  |
| UNEF |  |
| ds | max |
| min |  |
| dk | max |
| min |  |
| k | Ref |
| s | Nominal Size |
| Nominal Size |  |
| t | min |
| b | min |
| α | ±2° |

| 0.375 | 0.4375 | 0.5 | 0.625 | 0.75 | 0.875 | 1 | 1.125 | 1.25 | 1.375 | 1.5 |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 16 | 14 | 13 | 11 | 10 | 9 | 8 | 7 | 7 | 6 | 6 |
| 24 | 20 | 20 | 18 | 16 | 14 | 12 | 12 | 12 | 12 | 12 |
| 32 | 28 | 28 | 24 | 20 | 20 | 20 | 18 | 18 | 18 | 18 |
| 0.375 | 0.4375 | 0.5 | 0.625 | 0.75 | 0.875 | 1 | 1.125 | 1.25 | 1.375 | 1.5 |
| 0.3678 | 0.4294 | 0.4919 | 0.6163 | 0.7406 | 0.8647 | 0.9886 | 1.1086 | 1.2336 | 1.3568 | 1.4818 |
| 0.781 | 0.844 | 0.938 | 1.188 | 1.438 | 1.688 | 1.938 | 2.188 | 2.438 | 2.688 | 2.938 |
| 0.72 | 0.781 | 0.872 | 1.112 | 1.355 | 1.604 | 1.841 | 2.079 | 2.316 | 2.553 | 2.791 |
| 0.234 | 0.234 | 0.251 | 0.324 | 0.396 | 0.468 | 0.54 | 0.611 | 0.683 | 0.755 | 0.827 |
| 7/32 | 1/4 | 5/16 | 3/8 | 1/2 | 9/16 | 5/8 | 3/4 | 7/8 | 7/8 | 1 |
| 0.219 | 0.25 | 0.312 | 0.375 | 0.5 | 0.562 | 0.625 | 0.75 | 0.875 | 0.875 | 1 |
| 0.159 | 0.159 | 0.172 | 0.22 | 0.22 | 0.248 | 0.297 | 0.325 | 0.358 | 0.402 | 0.435 |
| 1.25 | 1.38 | 1.5 | 1.75 | 2 | 2.25 | 2.5 | 2.81 | 3.12 | 3.44 | 3.75 |
| 82° | 82° | 82° | 82° | 82° | 82° | 82° | 82° | 82° | 82° | 82° |

## Description

DIN 7991 Hexagon Socket Countersunk Head Cap Screws is part of our countersunk & flat-head machine screws range (Screws).

### Key details

- **Type:** Hexagon Head
- **Standard:** DIN, ANSI, GB, JIS, GOST
- **Material:** High Strength Steel
- **Grade:** 8.8
- **Head Style:** Hexagonal
- **Finish:** Hot Galvanizing
- **Connection:** Common Bolt
- **Application:** Machinery, Chemical Industry, Environmental, Building

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$0.36 – 1.20 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?

The listed minimum order is 1,000 pieces, at US$0.36 – 1.20 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$1.20 for 1,000–9,999 pieces; US$0.60 for 10,000–99,999 pieces; US$0.36 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?

Type: Hexagon Head; Standard: DIN, ANSI, GB, JIS, GOST; Material: High Strength Steel; Grade: 8.8; Head Style: Hexagonal; Finish: Hot Galvanizing. 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
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- Samples available for approval before mass production

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## Request a quote for this product

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**US$0.36 – 1.20**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%20DIN%207991%20Hexagon%20Socket%20Countersunk%20Head%20Cap%20Screws%20%E2%80%94%20https%3A%2F%2Fengineeringhardware.com%2Fproduct%2Fdin-7991-hexagon-socket-countersunk-head-cap-screws-2%2F)