Specialty Bolts
Your Professional Specialty Bolts Manufacturers
Handan DongChao Hardware Products Co., Ltd. is a leading fastener manufacturer and factory established in 2008, located in the fastener capital of China. With nearly two decades of experience in design, production, and global distribution, we specialize in producing self drilling screws, Tek screws, and self tapping screws. In addition, we supply a wide range of high-quality fasteners including bolts, nuts, washers, shear studs, threaded rods, anchor bolts, and rivets, serving diverse industries worldwide.
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Why Choose Us
Professional Team
The members of the team are highly skilled and proficient in their respective roles and possess the necessary education, training, and experience to excel in their jobs.
Quality & Certification
Handan DongChao adheres to strict international quality standards, holding ISO and CCC certificates. Every product is engineered for durability, strength, and reliability to meet the needs of demanding applications.
Customized Services
We understand that each customer has unique manufacturing needs. That’s why we offer customization options to cater to your specific requirements.
Global Market
Our fasteners are widely exported to USA, UK, UAE, Saudi Arabia, Vietnam, Korea, Africa, South America, and many other regions, earning trust and recognition from customers worldwide.
Key Features of Specialty Bolts
Self-Fracturing Design
When the bolt reaches a specific torque value, the head of the shear bolt fractures, ensuring it is not over-tightened.
No Need For Locking Washers
Due to its self-fracturing nature, additional locking measures are unnecessary.
High Strength
Typically made of high-strength steel materials, the bolt provides strong load-bearing capabilities.
High Reliability
The automatic fracturing function avoids human errors in tightening, ensuring the strength and stability of the connection.
Industry-Specific Specialty Bolt Applications
Aerospace Applications
Specialty bolt aerospace fasteners must meet stringent weight, strength, and reliability requirements.
Automotive Industry
Specialty bolt automotive fasteners address the unique challenges of modern vehicle manufacturing, including the use of lightweight materials, crash safety requirements, and environmental durability.
Marine Environment
Specialty bolt marine fasteners are engineered to withstand saltwater corrosion, extreme weather conditions, and constant exposure to moisture.
Industrial Applications
Specialty Bolt fasteners are used in heavy machinery, processing equipment, and infrastructure projects where standard fasteners cannot provide adequate performance.
Energy Sector
Specialty bolts for energy industry applications must withstand extreme pressures, temperatures, and corrosive environments found in oil and gas, nuclear, and renewable energy installations.
Manufacturing Process of Special Bolts
Special bolts are generally made from alloy steel or titanium alloy with strength higher than 1000 MPa. The precision forging guarantees the bolt shape and size, along with a dimensional tolerance of ±0.02 millimeters. Quenching at 950°C and tempering at 600°C are heat treatment processes that increase the hardness of bolts while also improving their toughness. Aerospace bolts are aged for 20 hours, which can reach a yield strength of more than 1300 MPa. Marine engineering bolts usually undergo hot-dip galvanization, with a coating thickness of not less than 15 microns.
The special bolts are closely related to the quality requirements of production. All bolts must clear UTS (ultrasonic testing), with accuracy up to 0.1 mm, showing no internal crack or bubble between its batch of bolts. Bolts should be tested in both tension and fatigue for a minimum of 500,000 cycles to ensure they do not experience any form of failure between loads. In addition to it, bolts have also been subjected to an adhesion test for the coating before they can be packed: Peel resistance of 8 N·mm is necessary because peeled coatings often drop into spray guns.
Size Chart
|
Thread Size (D) |
Thread Pitch (Mm) |
Head Width (B) |
Head Height (K) |
Length (L) |
|
M6 |
1.0 |
10 |
6 |
20–60 mm |
|
M8 |
1.25 |
13 |
8 |
25–80 mm |
|
M10 |
1.5 |
16 |
9 |
30–100 mm |
|
M12 |
1.75 |
18 |
11 |
35–120 mm |
|
M16 |
2.0 |
24 |
14 |
40–150 mm |
|
M20 |
2.5 |
30 |
17 |
50–200 mm |
Lead Time
|
Quantity (pieces) |
1 - 1000 |
1001 - 3000 |
3001 - 5000 |
> 5000 |
|
Lead time (days) |
7 |
16 |
20 |
To be negotiated |
Packing
Packing Details: Boxes+carton+pallet, or customized packing according to your need.
FAQ
As one of the leading specialty bolts manufacturers and suppliers in China, we warmly welcome you to wholesale bulk specialty bolts in stock here and get pricelist from our factory. All customized products are with high quality and competitive price.
bolt, Carbon Steel U Bolt Clamp, Zinc Plated Stud Bolt