---
title: "Grade 12.9 Black High-Strength Cylindrical Head Hex Socket Bolts / Hex Socket Cap Screws (M2~M10)"
description: "Grade 12.9 Black High-Strength Cylindrical Head Hex Socket Bolts / Hex Socket Cap Screws… — Structural & Heavy Hex Bolts. MOQ 500 pieces, US$0.12 – 0.72."
url: https://engineeringhardware.com/product/grade-12-9-black-high-strength-cylindrical-head-hex-socket-bolts-hex-socket-cap/
source: Engineering Hardware & Fasteners
---

# Grade 12.9 Black High-Strength Cylindrical Head Hex Socket Bolts / Hex Socket Cap Screws (M2~M10)

[![Grade 12.9 Black High-Strength Cylindrical Head Hex Socket Bolts / Hex Socket Cap Screws (M2~M10)](https://img.engineeringhardware.com/Grade-12-9-Black-High-Strength-Cylindrical-Head-Hex-Socket-Bolts-Hex-Socket-Cap-Screws-M2-M10.webp)](https://img.engineeringhardware.com/Grade-12-9-Black-High-Strength-Cylindrical-Head-Hex-Socket-Bolts-Hex-Socket-Cap-Screws-M2-M10.webp)

- Standard & made-to-drawing parts
- Checked before shipping
- Air, sea & express delivery

[Bolts › Structural & Heavy Hex Bolts](https://engineeringhardware.com/fastener-products/bolts/structural-heavy-hex-bolts/)

Updated 2026-11-04 · [Markdown version](https://engineeringhardware.com/product/grade-12-9-black-high-strength-cylindrical-head-hex-socket-bolts-hex-socket-cap.md)

Model no. **Screws (M2~M10)**

US$0.12 – 0.72 / piece

MOQ 500 pieces · Final price confirmed in your quote

- **Material:** Carbon Steel
- **Head Style:** Round
- **Standard:** GB
- **Grade:** 12.9
- **Surface Treatment:** Nickel Plating
- **Strength Grade:** Grade 12.9
- **Head Shape:** Round Head
- **Package Size:** 50.00cm * 30.00cm * 20.00cm

Get a quote [WhatsApp](https://wa.me/8615999653684?text=Hi%20Engineering%20Hardware%20%26amp%3B%20Fasteners%2C%20I%20would%20like%20a%20quote%20for%3A%20Grade%2012.9%20Black%20High-Strength%20Cylindrical%20Head%20Hex%20Socket%20Bolts%20%2F%20Hex%20Socket%20Cap%20Screws%20%28M2~M10%29%20%E2%80%94%20https%3A%2F%2Fengineeringhardware.com%2Fproduct%2Fgrade-12-9-black-high-strength-cylindrical-head-hex-socket-bolts-hex-socket-cap%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 | Round Head |
| Model NO. | Screws (M2~M10) |
| Groove | Cross |
| Connection | Common Bolt |
| Head Style | Round |
| Standard | GB |
| Grade | 12.9 |
| Surface Treatment | Nickel Plating |
| Application | Construction Industry, Rail Transit Equipment Manu |
| Strength Grade | Grade 12.9 |
| Head Shape | Round Head |
| Transport Package | Plastic Bag + Paper Box |
| Specification | M1.6-M16 |
| Origin | China |
| HS Code | 8405100000 |
| Production Capacity | 100000pieces/Year |
| Package Size | 50.00cm * 30.00cm * 20.00cm |
| Package Gross Weight | 10.000kg |
| Specification Composition | Thread Diameter * Length (DL), for example: M4*20 |
| Thread diameter | 4D, Thread length: 20MDI |
| Unit | mm (millimeters) |
| Category | [Structural & Heavy Hex Bolts](https://engineeringhardware.com/fastener-products/bolts/structural-heavy-hex-bolts/) |

## Technical parameters

| Name | Grade 12.9 Hex Socket Head Cap Screw | Specifications | M1.6-M16 | Standards | GB |
| --- | --- | --- | --- | --- | --- |
| Standards | DIN912 | Materials | Plain Carbon Steel | Application | Architecture, Rail Transit, and Related Fields |
| Surface Treatment | Black Plating | Strength Grade | Grade 12.9 | Head Type | Socket Cap Head |

| Name | Grade 12.9 Hex Socket Head Cap Screw | Surface Treatment | Black Oxide | Product Specifications | M1.6-M16 |
| --- | --- | --- | --- | --- | --- |
| Standards | National Standard | Packaging Instructions | Plastic Bag + Paper Box | Material | Alloy Steel |

| For orders with especially high tolerance requirements, please proceed with caution. The thread specification d*L follows the reference naming convention, and the length does not include the head length. Unit: mm (millimeters) |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Nominal Diameter (d) | Pitch (P) | Head Diameter (dk) | Head Thickness (k) | Hexagon Socket Width (S) | Slot Depth (t) |  |  |  |
| M1.4 | 0.3 | 2.74 | 2.46 | 1.4 | 1.26 | 1.36 | 1.32 | 0.6 |
| M1.6 | 0.35 | 3.14 | 2.86 | 1.6 | 1.46 | 1.56 | 1.52 | 0.7 |
| M2 | 0.4 | 3.98 | 3.62 | 2 | 1.86 | 1.56 | 1.52 | 1 |
| M2.5 | 0.45 | 4.68 | 4.32 | 2.5 | 2.36 | 2.06 | 2.02 | 1.1 |
| M3 | 0.5 | 5.68 | 5.32 | 3 | 2.86 | 2.58 | 2.52 | 1.3 |
| M4 | 0.7 | 7.22 | 6.78 | 4 | 3.82 | 3.08 | 3.02 | 2 |
| M5 | 0.8 | 8.72 | 8.28 | 5 | 4.82 | 4.095 | 4.02 | 2.5 |
| M6 | 1 | 10.22 | 9.78 | 6 | 5.7 | 5.14 | 5.02 | 3 |
| M8 | 1.25 | 13.27 | 12.73 | 8 | 7.64 | 6.14 | 6.02 | 4 |
| M10 | 1.5 | 16.27 | 15.73 | 10 | 9.64 | 8.175 | 8.025 | 5 |
| M12 | 1.75 | 18.27 | 17.73 | 12 | 11.57 | 10.18 | 10.025 | 6 |
| M14 | 2 | 21.33 | 20.67 | 14 | 12.57 | 12.21 | 12.032 | 7 |
| M16 | 2 | 24.33 | 23.67 | 16 | 15.57 | 14.21 | 14.032 | 8 |
| M18 | 2.5 | 27.33 | 26.67 | 18 | 17.57 | 14.21 | 14.032 | 9 |
| M20 | 2.5 | 30.33 | 19.67 | 20 | 19.48 | 17.23 | 17.05 | 10 |

| Cup Head Hex Socket Screw and Metric Hex Wrench Compatibility Chart |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Screw Specification | M1.4 | M1.6 | M2 | M2.5 | M3 | M4 | M5 | M6 | M8 | M10 | M12 |
| Compatible Hex Wrench | 1.27mm | 1.5mm | 2mm | 2.5mm | 3mm | 4mm | 5mm | 6mm | 8mm | 10mm |  |

## Description

Grade 12.9 Black High-Strength Cylindrical Head Hex Socket Bolts / Hex Socket Cap Screws (M2~M10) is part of our structural & heavy hex bolts range (Bolts).

### Key details

- **Type:** Round Head
- **Standard:** GB
- **Material:** Carbon Steel
- **Grade:** 12.9
- **Strength Grade:** Grade 12.9
- **Head Style:** Round
- **Groove:** Cross
- **Surface Treatment:** Nickel Plating

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

### Ordering through Engineering Hardware & Fasteners

Minimum order is 500 pieces at US$0.12 – 0.72 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 Grade 12.9 Black High-Strength Cylindrical Head Hex Socket Bolts / Hex Socket Cap Screws (M2~M10)?

The listed minimum order is 500 pieces, at US$0.12 – 0.72 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 Grade 12.9 Black High-Strength Cylindrical Head Hex Socket Bolts / Hex Socket Cap Screws (M2~M10)?

Type: Round Head; Standard: GB; Material: Carbon Steel; Grade: 12.9; Strength Grade: Grade 12.9; Head Style: Round. 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 surface treatment. 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 structural & heavy hex bolts are available?

The Structural & Heavy Hex Bolts category lists 2,565 products in different sizes, materials and finishes: [https://engineeringhardware.com/fastener-products/bolts/structural-heavy-hex-bolts/](https://engineeringhardware.com/fastener-products/bolts/structural-heavy-hex-bolts/)

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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