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Home > Hot Products > China Suppliers Hexagon Socket Head Cap Bolt DIN 912 - Factory Direct, Various Grades and Surface Treatments Available
China Suppliers Hexagon Socket Head Cap Bolt DIN 912 - Factory Direct, Various Grades and Surface Treatments Available
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China Suppliers Hexagon Socket Head Cap Bolt DIN 912 - Factory Direct, Various Grades and Surface Treatments Available

China Suppliers Hexagon Socket Head Cap Bolt DIN 912 - Factory Direct, Various Grades and Surface Treatments Available

Discover high-quality fasteners at competitive prices with our China-based factory. We offer a range of options, including Plain, Zinc Plated (ZP), Galvanized, Hot Dip Galvanized, and Dacromet surface treatments. Our products are crafted from a variety of materials such as Carbon Steel, Alloy Steel, Stainless Steel, Brass, and Copper, ensuring durability and performance. As a trusted supplier, we adhere to various standards including DIN, GB, UNC, BSW, and JIS. Our certified manufacturing processes meet ISO 9001, ISO 14001, and ISO 45001, ensuring top-notch quality. Choose from grades like 4.8, 8.8, 10.9, 12.9, A2-70, A4-70, and A4-80 to meet your specific requirements. With a minimum order quantity of just 100 pieces and a monthly supply ability of 10,000 pieces, we are well-equipped to handle your needs efficiently.

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Product Description

Product nameHexagonal socket screw
SizeM6 / M8 / M10 / M12
Grade4.8 / 8.8 / 10.9 / 12.9
MaterialSteel / Stainless Steel
Surface treatmentYZP
StandardDIN / ISO
CertificateISO 9001
SampleFree Samples
Definition and Structural Characteristics

An internal hexagonal screw is a fastener with a hexagonal groove (internal hexagonal hole) on the head, which requires the use of an Allen Key or a hexagonal screwdriver head matched with an electric tool for installation and removal.

Structural Features:

  • Head types: Common cylindrical heads (such as ISO 4762 / DIN 912), countersunk heads (such as DIN 7991), flat heads, etc.
  • Thread type: Full thread or half thread, with various materials and surface treatments.
Materials and Surface Treatment
Carbon Steel

Grades 8.8 & 12.9 — high strength, widely used in machinery and automotive applications.

Stainless Steel

304 / 316 grades — corrosion-resistant, suitable for outdoor and medical equipment environments.

Titanium Alloy

Lightweight with high corrosion resistance — used in aerospace and high-performance applications.

Application Scenarios
Industrial Field

Machine tools, molds, automation equipment — high-strength connections that require frequent disassembly.

Automotive / Aviation

Engine components, chassis — designed for high temperature resistance and vibration resistance.

Consumer Electronics

Laptops, cameras — precision small-sized screws such as M1.6 for delicate assemblies.

Furniture / Bicycle

IKEA furniture assembly, bicycle brake systems — countersunk design prevents surface scratching.

Usage Tips

  • The wrench should be fully inserted into the bottom of the hole to avoid sliding teeth.
  • When pre-drilling, countersunk screws need to match the taper (such as 90°).
  • Regularly check the torque to prevent over-tightening or loosening.
Hexagonal socket screw
Frequently Asked Questions
Q What is a hexagonal socket screw and how does it differ from a regular screw?
A hexagonal socket screw (also called an Allen bolt) features a recessed hexagonal drive hole in the head. This design allows for higher torque application, a lower profile head, and is less prone to cam-out compared to regular screws.
Q What sizes and grades are available for hexagonal socket screws?
Standard sizes include M6, M8, M10, and M12, with strength grades ranging from 4.8 to 12.9. Grade 12.9 offers the highest tensile strength for demanding industrial applications.
Q Which material should I choose — carbon steel or stainless steel?
Choose carbon steel (grades 8.8 or 12.9) for high load-bearing capacity in machinery. Stainless steel (304 or 316) is ideal for corrosion resistance in outdoor, marine, or medical environments.
Q What does YZP surface treatment mean and what protection does it offer?
YZP stands for Yellow Zinc Plating. This process provides a protective coating that enhances corrosion resistance and gives the fastener a golden-yellow finish.
Q What standards do your hexagonal socket screws comply with?
Our products comply with international standards such as DIN 912 (ISO 4762) for socket head cap screws and DIN 7991 for countersunk variants, manufactured under ISO 9001 quality management.
Q Can I request free samples before placing a bulk order?
Yes, free samples are available for testing fit and performance. Please provide your required specifications including size, grade, and material to arrange a prompt shipment.

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