---
product_id: 506914635
title: "M4 x 20mm 25mm 30mm 35mm 40mm Hex Socket Head Cap Screws Bolts, 12.9 Grade Alloy Steel, Black Oxide Finish, Metric Allen Drive, Fully Threaded, Assortment Kit 50Pcs"
brand: "joamang"
price: "6.91 OMR"
currency: OMR
in_stock: true
reviews_count: 8
url: https://www.desertcart.com.om/products/506914635-m4-x-20mm-25mm-30mm-35mm-40mm-hex-socket-head
store_origin: OM
region: Oman
---

# Black Oxide Finish - Corrosion & Wear Resistant 5 Length Sizes - Precision Fit for Every Project 12.9 Grade Alloy Steel - Ultimate Strength M4 x 20mm 25mm 30mm 35mm 40mm Hex Socket Head Cap Screws Bolts, 12.9 Grade Alloy Steel, Black Oxide Finish, Metric Allen Drive, Fully Threaded, Assortment Kit 50Pcs

**Brand:** joamang
**Price:** 6.91 OMR
**Availability:** ✅ In Stock

## Summary

> ⚙️ Elevate your build game with bolts that mean business!

## Quick Answers

- **What is this?** M4 x 20mm 25mm 30mm 35mm 40mm Hex Socket Head Cap Screws Bolts, 12.9 Grade Alloy Steel, Black Oxide Finish, Metric Allen Drive, Fully Threaded, Assortment Kit 50Pcs by joamang
- **How much does it cost?** 6.91 OMR with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.om](https://www.desertcart.com.om/products/506914635-m4-x-20mm-25mm-30mm-35mm-40mm-hex-socket-head)

## Best For

- joamang enthusiasts

## Why This Product

- Trusted joamang brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Last:** Crafted from premium 12.9 grade alloy steel for unmatched durability and strength.
- • **Precision Drive:** Metric Allen hex socket (3mm) offers secure, slip-free tightening for flawless assembly.
- • **Sleek & Stealthy:** Black oxide finish not only resists corrosion but adds a professional matte look.
- • **Ready for Anything:** Fully threaded design maximizes grip and versatility across all your projects.
- • **Perfect Fit Every Time:** Five distinct lengths (20-40mm) ensure you have the exact bolt for any task.

## Overview

This 50-piece M4 hex socket head cap screw kit features 12.9 grade alloy steel bolts with a black oxide finish for superior corrosion and wear resistance. Available in five lengths from 20mm to 40mm, each fully threaded bolt offers precision metric Allen drive compatibility, making it the essential professional-grade fastening solution for demanding projects.

## Description

M4 x 20mm 25mm 30mm 35mm 40mm Hex Socket Head Cap Screws Bolts, 12.9 Grade Alloy Steel, Black Oxide Finish, Metric Allen Drive, Fully Threaded, Assortment Kit 50Pcs

## Features

- Material: 100% 12.9 Grade alloy steel, and the surface is treated with black oxide. They have excellent corrosion resistance, firmness, wear resistance and low temperature resistance.
- Thread Diameter: 4 mm; Pitch Size: 0.7 mm, Thread Length: 20 mm, 25 mm, 30 mm, 35 mm, 40 mm.
- Head Diameter: 7.2 mm; Head Height: 4 mm; Drive Type: Allen Hex Socket 3 mm; Color: Black Oxide.
- Package Included: M4 x 20 mm(10PCS), M4 x 25 mm(10PCS), M4 x 30 mm(10PCS), M4 x 35 mm(10PCS), M4 x 40 mm(10PCS).
- Any time you need us, please contact us via email or Q&A. We will provide you with professional service and reply to you as soon as possible, you can rest assured to buy.

## Product Details

- **Material:** Alloy Steel
- **Grade Rating:** Class 12.9
- **Thread Size:** M4
- **Exterior Finish:** Black Oxide
- **Manufacturer Grade:** Grade Alloy

## Images

![M4 x 20mm 25mm 30mm 35mm 40mm Hex Socket Head Cap Screws Bolts, 12.9 Grade Alloy Steel, Black Oxide Finish, Metric Allen Drive, Fully Threaded, Assortment Kit 50Pcs - Image 1](https://m.media-amazon.com/images/I/81PYf0XjzRL.jpg)
![M4 x 20mm 25mm 30mm 35mm 40mm Hex Socket Head Cap Screws Bolts, 12.9 Grade Alloy Steel, Black Oxide Finish, Metric Allen Drive, Fully Threaded, Assortment Kit 50Pcs - Image 2](https://m.media-amazon.com/images/I/61Y3ShSMG-L.jpg)
![M4 x 20mm 25mm 30mm 35mm 40mm Hex Socket Head Cap Screws Bolts, 12.9 Grade Alloy Steel, Black Oxide Finish, Metric Allen Drive, Fully Threaded, Assortment Kit 50Pcs - Image 3](https://m.media-amazon.com/images/I/71iZ+mqlMML.jpg)
![M4 x 20mm 25mm 30mm 35mm 40mm Hex Socket Head Cap Screws Bolts, 12.9 Grade Alloy Steel, Black Oxide Finish, Metric Allen Drive, Fully Threaded, Assortment Kit 50Pcs - Image 4](https://m.media-amazon.com/images/I/71R15EsjfCL.jpg)
![M4 x 20mm 25mm 30mm 35mm 40mm Hex Socket Head Cap Screws Bolts, 12.9 Grade Alloy Steel, Black Oxide Finish, Metric Allen Drive, Fully Threaded, Assortment Kit 50Pcs - Image 5](https://m.media-amazon.com/images/I/8158f7f-mxL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Perfect for projects.
*by E***. on April 8, 2025*

As described

### ⭐⭐⭐⭐⭐ Great value
*by J***. on March 14, 2025*

These are sometimes close to $1 at true value, or any other big box store. These are a great value.

### ⭐⭐⭐⭐⭐ 4m x 40 Button Head Screws, just what I needed
*by T***S on March 7, 2024*

Fair price, received quickly and exactly what I ordered. I use these on my 3D printed projects!Thanks much.

## Frequently Bought Together

- Joamang M4 x 20mm 25mm 30mm 35mm 40mm Hex Socket Head Cap Screws Bolts, 12.9 Grade Alloy Steel, Black Oxide Finish, Metric Allen Drive, Fully Threaded, Assortment Kit 50Pcs
- binifiMux 50Pcs Black M4 X 0.7MM Nylon Lock Nuts Inserted Hex Self Clinching Lock Nuts
- iexcell 25 Pcs M5 x 40/45/50/55/60 Alloy Steel 12.9 Grade Hex Socket Head Cap Screws Bolts Assortment Kit, Black Oxide Finish

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**Shop now:** [https://www.desertcart.com.om/products/506914635-m4-x-20mm-25mm-30mm-35mm-40mm-hex-socket-head](https://www.desertcart.com.om/products/506914635-m4-x-20mm-25mm-30mm-35mm-40mm-hex-socket-head)

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*Product available on Desertcart Oman*
*Store origin: OM*
*Last updated: 2026-01-23*