Ss 304 316 DIN7991 M2 M2.5 M3 M4 M5 M6 M8 M10 M12 Countersunk Head Bolts Stainless Steel Flat Head Bolt

• Customization: Available
• Material: Stainless Steel
• Type: Hexagon Head
• Model NO.: DIN7991
• Connection: Common Bolt
• Head Style: Hexagonal
• Standard: DIN, ANSI, GB, BSW
• Grade: 8.8
• Application: Machinery, Chemical Industry, Building
• Finish: Color-Zinc Plated
• Finish 1: Mechanical Galvanizing
• Finish 2: Zp
• Finish 3: Nickel Palting
• Transport Package: We Can Follow Customer′s Request
• Specification: we can follow customer′s request
• Trademark: HQ
• Origin: Handan City
• HS Code: 7318160000

Product Description

       Product introduction

DIN 7991 Countersunk bolts Product introduction **

DIN 7991 Countersunk Head Bolts are high precision fasteners according to the German Industrial Standard (DIN), designed for applications requiring flat mounting surfaces and high tensile strength. Its unique countersunk structure allows the bolt head to be fully embedded in the workpiece surface, avoiding bulges and ensuring a streamlined appearance and functionality of the assembly while providing reliable anti-vibration and anti-loosening properties.

** Core Features: **
1. ** Precision countersink design **
The standard 90° taper Angle of the head perfectly matches the DIN 7991 standard sink hole, and the surface is smooth and non-protruding after installation, suitable for scenes with strict aerodynamic or visual requirements.

2. ** High strength material **
Bolts are made of carbon steel (e.g. 8.8, 10.9) or stainless steel (e.g. A2/A4-70) with high tensile strength (up to 1000 MPa) and toughness to meet heavy and dynamic load requirements.

3. ** Locking performance optimization **
Some models are available with pre-coated (Loctite®) or lock washers to protect against the risk of loosening in vibration environments and ensure long-term stability.

4. ** Corrosion resistant surface treatment **
Electrogalvanizing, hot dip galvanizing, Dacromet, passivation (stainless steel) and other processes, suitable for wet, chemical or outdoor harsh environment.

** Application field: **
- ** Machinery manufacturing ** : machine tools, conveying equipment and other high-precision assembly.
- ** Automotive Industry ** : Body structure, engine components and chassis fastening.
- ** Aerospace ** : Components with lightweight design and high surface smoothness requirements.
- ** Buildings and Bridges ** : Steel structure connection and corrosion protection requirements scenario.

** Specifications: **
- ** Standard ** : DIN 7991 (compatible with ISO 10642 international standard)
- ** Size range ** : M3 to M36, length 6mm to 300mm (support customization).
- ** Torque value ** : Provide accurate preload data according to material grade to ensure installation reliability.

Summary of advantages: **
DIN 7991 countersunk head bolts, with their standardized design, excellent mechanical properties and wide applicability, are the preferred solution for industrial fastening. Whether it is aesthetically pleasing consumer electronics devices or heavy machinery under harsh conditions, it provides a safe and long-lasting connection.

Product Parameters

 

ITEM NAME:	Ss 304 316 DIN7991 M2 M2.5 M3 M4 M5 M6 M8 M10 M12countersunk Head Bolts Stainless Steel Flat Head Bolt
MATERIAL:	Carbon steel, Alloy Steel, Stainless Steel, Brass
STANDARD:	GB / DIN / ASME/ANSI  / BSW
GRADE:	SAE J429 Gr.2, 5,8; ASTM A307Gr.A, Class 4.8, 5.8, 6.8, 8.8, 10.9, 12.9;A2-70,A4-70,A4-80
SIZE:	1/4"-2 1/2",M4-M64
SIZE:	1/8" 1/4" 5/16" 3/8" 7/16" 1/2" 5/8" 3/4" 7/8" 1" 1-1/4" 1-1/2" 1-3/4" 2" 3" 4"
FINISH :	Plain,Black oxide, Zinc Plated(Clear/Blue/Yellow/Black), H.D.G, Nickel, Chrome,PTFE,Dacromet,Geomet,Magni,Zinc Nickel,Zinteck.

Detailed Photos

 

Company Profile

**Handan Haoqiang Fastener Manufacturing Co., Ltd.**

**Address:** C6-13, Shichuang Logistics Port, Yongnian District, Handan City, Hebei Province, China

Since its inception in 2005, Handan Haoqiang Fastener Manufacturing Co., Ltd. has distinguished itself as a premier manufacturer and exporter, specializing in high-quality fasteners. With over a decade of unrivaled production expertise and a global trade footprint since 2014, we have earned a formidable reputation for delivering impeccable, precision-engineered fastening solutions to clients on a global scale.

**Core Products:**
- An extensive array of nuts and bolts in diverse specifications
- High-strength bolts and nuts designed for demanding applications
- Customized fasteners expertly tailored to meet specific client requirements

**Compliance Standards:**
Our products are meticulously crafted to adhere to esteemed international standards, including:

- **DIN** (German Standard)

- **GB** (Chinese National Standard)

- **ANSI/ASTM** (American Standard)

- **BSW** (British Standard Whitworth)

- **JIS** (Japanese Industrial Standard)

Harnessing state-of-the-art manufacturing technology and rigorous quality control systems, we guarantee durability, superior performance, and compliance with the stringent demands of global industries. Our unwavering commitment to innovation and customer-centric excellence has allowed us to forge enduring partnerships across dynamic sectors such as construction, machinery, automotive, and energy.

At the core of Haoqiang Fastener lies a dedication to integrity, efficiency, and sustainability. Whether catering to domestic projects or navigating international exports, we are driven to surpass expectations with competitive pricing, prompt delivery, and outstanding after-sales support.

*Connect with us today to discuss your fastener needs and discover how our expertise can fortify your projects!*

Exhibition Display

 

Packaging & Shipping

PACKAGE : Secure your goods with our customized packaging options: 25kgs Box with Pallet, 25kgs woven bags, or 25kgs Gunny bags. We also offer packaging tailored to the customer's request, ensuring your products reach their destination safely and efficiently.

FAQ

**Product & Specifications**
Q: What standards do your fasteners comply with?*
A: Our products meet DIN (German), GB (China), ANSI/ASTM (USA), BSW (UK), and JIS (Japan) standards. Custom specifications are available upon request.

**Order & Payment**
*Q: How can I track my international order?*
A: A real-time tracking number will be emailed once your shipment is dispatched. For urgent inquiries, contact export customer service

**Shipping & Logistics**
*Q: What are your delivery options for overseas customers?*
A: We offer sea freight (FOB/CIF), air freight, and express courier (DHL/FedEx) with competitive rates. Delivery timelines vary by destination.

**Returns & Warranty**
*Q: What if I receive defective products?*
A: We provide a 12-month quality guarantee. Report issues within 7 days of receipt with photos/video, and we'll arrange replacements or refunds promptly.

**Technical Support**
*Q: Can you assist with material selection for extreme environments?*

A: Absolutely! Our engineering team offers free consultation on corrosion-resistant, high-temperature, or high-load solutions.