DIN7991 Countersunk Hex Socket Screws | Flat Head Allen Bolts - HighFasteners

Product Overview

The DIN7991 Countersunk Hexagon Socket Bolt is a low-profile fastener with a flat head and internal hex drive. It sits flush with the surface after installation, providing a clean, protrusion-free finish while delivering secure, high-torque fastening.

Black oxide coating enhances corrosion resistance, making it ideal for machinery, equipment, automotive, and structural applications.

Key Features:

Flush Mounting: Countersunk head ensures no protrusion for smooth, aesthetic surfaces.

High Torque Drive: Internal hex socket allows precise tightening with Allen wrench in tight spaces.

Corrosion Resistant: Black oxide finish protects against rust in demanding environments.

Technical Specifications:

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Factory Direct Price | Fast Delivery | OEM Service

Email: admin@changhua-electrical.com  |  WhatsApp: +86 181 3296 8158

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Detailed Product Gallery

Manufacturing & Quality Control

Advanced Cold Heading Precision manufacturing.

Optical Sorting 0-PPM defects.

Lab Testing Tensile & Salt Spray.

Project References

Machinery Flush Secure Connections

Automotive High Torque Fastening

Construction Low-Profile Structural

Frequently Asked Questions

Q: Can I get free samples?
Yes! We provide free samples for standard countersunk screws. You only need to cover the shipping cost.

Q: What grades and finishes do you support?
Grades up to 12.9, black oxide standard. Custom finishes available.

Q: What certifications do you have?
We are ISO9001:2015 Certified. Every shipment comes with a Factory Quality Inspection Report.

Q: What is your delivery time?
Stock items: 3-7 days. Mass production: 20-30 days.

Q: Can you produce according to drawings?
Yes, OEM/ODM is our strength. Send us CAD drawings for a quote within 24 hours.

Q: What are your payment terms?
We generally accept T/T (30% deposit, 70% before shipment). For long-term partners, we can discuss L/C.