---
title: "Stainless Steel DIN7991 Hex Socket Countersunk Head Cap Screw"
description: "Stainless Steel DIN7991 Hex Socket Countersunk Head Cap Screw — Socket Head Cap & Allen Screws. MOQ 100 pieces, US$0.29 – 0.34."
url: https://engineeringhardware.com/product/stainless-steel-din7991-hex-socket-countersunk-head-cap-screw/
source: Engineering Hardware & Fasteners
---

# Stainless Steel DIN7991 Hex Socket Countersunk Head Cap Screw

[![Stainless Steel DIN7991 Hex Socket Countersunk Head Cap Screw](https://img.engineeringhardware.com/Stainless-Steel-DIN7991-Hex-Socket-Countersunk-Head-Cap-Screw.webp)](https://img.engineeringhardware.com/Stainless-Steel-DIN7991-Hex-Socket-Countersunk-Head-Cap-Screw.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/stainless-steel-din7991-hex-socket-countersunk-head-cap-screw.md)

Model no. **M12X40**

| **US$0.34**100–499 pieces | **US$0.31**500–999 pieces | **US$0.30**1,000–4,999 pieces | **US$0.29**5,000+ pieces |
| --- | --- | --- | --- |

MOQ 100 pieces · Final price confirmed in your quote

- **Material:** Stainless Steel
- **Head Style:** Hexagonal
- **Standard:** DIN, ANSI, ISO
- **Grade:** A4-70
- **Finish:** Passivation
- **Price for The Size:** M12X40

Get a quote [WhatsApp](https://wa.me/8615999653684?text=Hi%20Engineering%20Hardware%20%26amp%3B%20Fasteners%2C%20I%20would%20like%20a%20quote%20for%3A%20Stainless%20Steel%20DIN7991%20Hex%20Socket%20Countersunk%20Head%20Cap%20Screw%20%E2%80%94%20https%3A%2F%2Fengineeringhardware.com%2Fproduct%2Fstainless-steel-din7991-hex-socket-countersunk-head-cap-screw%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 | Hexagon Head |
| Model NO. | M12X40 |
| Connection | Common Bolt |
| Head Style | Hexagonal |
| Standard | DIN, ANSI, ISO |
| Grade | A4-70 |
| Application | Machinery, Chemical Industry, Environmental, Building |
| Finish | Passivation |
| Price for The Size | M12X40 |
| Transport Package | CTN, Then in Pallet |
| Specification | M12X40 |
| Origin | Jiangsu, China |
| HS Code | 7318151090 |
| Production Capacity | 100ton/Month |
| Hexagon socket | facilitates tightening and untightening with an Allen key. Metric thread: available in metric ISO thread from M3 to M24 to suit different applications. |
| Category | [Socket Head Cap & Allen Screws](https://engineeringhardware.com/fastener-products/screws/socket-head-cap-allen-screws/) |

## Technical parameters

| Name | Stainless steel Hexagon Socket Countersunk Head Cap Screws |
| --- | --- |
| Standard | DIN7991,ISO10642 |
| Size Range | M3-M24 or non-standard as requested |
| Finish | Bright&Clean |
| Marking | HT&FST or customization |
| Material | SS304,A2,1.4301; SS316,A4,1.4401 |
| Grade | Grade A2-70 & A4-70 |
| Certificates | EN10204-3.1B |
| Non-standards | OEM is available, according to drawing or samples |
| Samples | Samples available |
| Package | Bulk in box and then in cartons, then on pallets,or according to customers' requirement. |
| Payment | T/T,Western Union, if order more than USD50,000 L/C is accepted |

| Grade | UNS | W.Nr |
| --- | --- | --- |
| 304 | S30400 | 1.4301 |

| Alloy | % | Ni | Cr | C | Mn | Si | S | N | P |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 304 | Min. | 8 | 18 |  |  |  |  |  |  |
| Max. | 10.5 | 20 | 0.08 | 2.0 | 1.0 | 0.03 | 0.10 | 0.035 |  |

| Density | 7.93 g/cm³ |
| --- | --- |
| Melting point | 1398-1454°C |

| Tensile strength Rm N/mm² | Yield strength RP0.2 N/mm² | Elongation rate A5% | Brinell hardness HB |
| --- | --- | --- | --- |
| 520 | 205 | 40 | ≤187 |

| Grade | UNS | W.Nr |
| --- | --- | --- |
| 316 | S31600 | 1.4401 |

| Alloy | % | Ni | Cr | C | Mn | Si | S | N | P |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 316 | Min. | 10.0 | 16.0 |  |  |  | 2.0 |  |  |
| Max. | 14.0 | 18.0 | 0.08 | 2.0 | 1.0 | 0.03 | 3.0 | 0.045 |  |

| Density | 7.98g/cm³ |
| --- | --- |
| Melting point | 1345-1450°C |

| Tensile strength Rm N/mm² | Yield strength RP0.2 N/mm² | Elongation rate A5% | Brinell hardness HB |
| --- | --- | --- | --- |
| 520 | 205 | 40 | ≤187 |

## Description

Stainless Steel DIN7991 Hex Socket Countersunk Head Cap Screw is part of our socket head cap & allen screws range (Screws).

### Key details

- **Type:** Hexagon Head
- **Standard:** DIN, ANSI, ISO
- **Material:** Stainless Steel
- **Grade:** A4-70
- **Head Style:** Hexagonal
- **Finish:** Passivation
- **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 100 pieces at US$0.29 – 0.34 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 Stainless Steel DIN7991 Hex Socket Countersunk Head Cap Screw?

The listed minimum order is 100 pieces, at US$0.29 – 0.34 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$0.34 for 100–499 pieces; US$0.31 for 500–999 pieces; US$0.30 for 1,000–4,999 pieces; US$0.29 for 5,000+ pieces. Final prices depend on size, material, finish and packing and are confirmed in your quote.

### What are the main specifications of Stainless Steel DIN7991 Hex Socket Countersunk Head Cap Screw?

Type: Hexagon Head; Standard: DIN, ANSI, ISO; Material: Stainless Steel; Grade: A4-70; Head Style: Hexagonal; Finish: Passivation. 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 & 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

[![Sales office](https://engineeringhardware.com/wp-content/uploads/2026/11/office-01-daily-sales-office-768x512.webp)](https://engineeringhardware.com/wp-content/uploads/2026/11/office-01-daily-sales-office.webp)

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$0.29 – 0.34**MOQ 100 piecesGet a quote[WA](https://wa.me/8615999653684?text=Hi%20Engineering%20Hardware%20%26amp%3B%20Fasteners%2C%20I%20would%20like%20a%20quote%20for%3A%20Stainless%20Steel%20DIN7991%20Hex%20Socket%20Countersunk%20Head%20Cap%20Screw%20%E2%80%94%20https%3A%2F%2Fengineeringhardware.com%2Fproduct%2Fstainless-steel-din7991-hex-socket-countersunk-head-cap-screw%2F)