- ISO, DIN & ASTM Compliant Manufacturing
Expert Bolt and nut Manufacturer
- Custom Solutions for Specific Requirements
- Free Samples, Low MOQ & Bulk Pricing
- Global Coverage Across 20+ Countries
Bolts & Nuts - Diverse Sizes & Specifications
From standard bolts and nuts to custom fasteners, from micro precision parts to complex structures — We customize all sorts of bolts and nuts according to your requirements.
Bolts Types: Hex Bolts / Hex Socket Bolts / Flange Bolts / Stud Bolts / Anchor Bolts / Copper Bolts / U-Bolts / Eye Bolts / Threaded Rods
Nuts Types: Hex Nuts / Flange Nuts / Lock Nuts / Nylon Nuts / Dome Nuts / Y Nuts / Rivet Nuts and Special Models
Material: Carbon Steel / Stainless Steel / Alloy Steel / Brass / Iron
The Core Feature of Bolts & Nuts
Bolts are detachable threaded fasteners used with mating nuts. Their overall performance depends on structure, material, strength grade, surface finish and manufacturing workflow. Multiple head‑style variants match diverse application scenarios. ISO 898‑1 defines strength‑grade calculation rules; proper material‑coating selection solves common field failures including thread stripping, loosening and rust.
| Dimension | Main Information |
|---|---|
| Basic structure | Thread (full‑thread / partial‑thread), unthreaded shank (shear‑resistant), torque‑transfer head, chamfered tip |
| Typical head types | Hex, flange, square‑head, carriage, countersunk, eye, T‑head, U‑bolt, anchor, Torx®, 12‑point |
| Main raw materials | Carbon‑steel, alloy‑steel, stainless‑steel(A2‑70/A4‑70), titanium‑alloy |
| ISO 898‑1 strength grades | 4.8(400 MPa tensile), 8.8(800 MPa), 10.9(1000 MPa), 12.9(1200 MPa) |
| Common surface treatments | Electro‑galvanizing, hot‑dip galvanizing, black‑oxide, Dacromet, nickel‑chrome plating |
| Core manufacturing steps | Cold/hot forging, thread rolling, quenching‑and‑tempering heat‑treatment, surface finishing |
Reliable Bolts & Nuts for Industrial Applications
- Customizable Options: Head / Drive / Thread / Material / Finish / Process
- Size: Manufactured exactly per drawings for unique assembly needs
- MOQ: Small-batch customization available
- Standard: Supports coarse / fine thread & Imperial and metric system
- Material: Carbon Steel / Stainless Steel /Aluminum
- Strength: A2 - 50 / 70 / 80 & A4 -70 / 80
- Finish: Anodizing / Mcro-arc oxidation / Natural cleaning / Electrophoresis
- Anti-corrosion: Excellent corrosion resistance
- Safety: Biocompatible and non-toxic
- Material: Carbon Steel / Stainless Steel /Aluminum
- Finish: Anodizing / Hard anodizing / Sandblasting / Natural color
- MOQ: Small-batch customization available
- Anti-corrosion: Excellent resistance to atmospheric corrosion
- Material: SUS304, SUS316, 316L, 410, 430
- Surface Treatment: Passivation / Polishing / Mirror Finish / Sandblasting / Electrophoresis / QPQ / Zinc-nickel Alloy
- Anti-corrosion: Excellent corrosion resistance
- Durability: High Strength, Durable and Aesthetic
- Material: Carbon Steel / Stainless Steel / Alloy steel, etc.
- Process: Molding / Cold Heading / Turning / stamping / forging
- Type: Long / Flange / Lock / Nylon / Y / Rivet and Special Model
- Hardness: Hardenable to grade 8 and above
- Type: Flat / Lock / Square / Serrated / Wave
- Material: Carbon Steel / Stainless Steel / Copper / Aluminum / Alloy, etc.
- Function: Disperse the pressure & Reduce vibration
- Application: Used to place between a connecting piece and a nut
Fully Customizable
High-Performance Bolts & Nuts for Engineering Projects
- Material: Carbon Steel / Stainless Steel / Brass / Alloy Steel / Iron
- Surface Treatment: Anodizing / Polishing / Zinc / Black Oxide / Phosphating / Passivation
- Bolts Types: Hex Bolts / Hex Socket Bolts / Flange Bolts / Stud Bolts / Anchor Bolts / Copper Bolts / U-Bolts / Eye Bolts / Threaded Rods
- Nuts Types: Long Nuts/ Flange Nuts / Lock Nuts / Nylon Nuts / Y Nuts / Rivet Nuts and Special Models
Common Types and Characteristics for Bolts & Nuts
Available specifications: ISO, DIN, ANSI, JIS, GB. Two major thread systems: metric(M‑series) and imperial UNC/UNF.
Real‑world examples: hot‑dip‑galvanized M20 for steel‑structures; grade‑10.9 bolts for automotive‑engines; A2‑70 socket‑head bolts for stainless‑steel furniture.
| Bolt Name | Feature Description | Application Scenarios |
|---|---|---|
| Hexagonal Head Bolt | The most common type with a hexagonal head, suitable for tightening with a wrench | Mechanical structures, construction installation |
| Flange Bolt | Equipped with a washer-like flange face to increase force-bearing area and prevent loosening | Automobiles, heavy-duty equipment |
| Square Head Bolt | Has a square head for easy clamping and locking, suitable for old-style structures | Railways, maintenance of old equipment |
| Cup Head Square Neck Bolt (Carriage Bolt) | Round head with a square neck to prevent rotation, mostly used in wood structures | Woodworking connections, furniture |
| Countersunk Head Bolt | Tapered head that can sink into the surface of connected objects without protruding | Precision equipment, thin plate connections |
| Eye Bolt | Features a ring at the top for lifting or traction | Lifting devices, transportation hanging points |
| T-head Bolt | T-shaped head that can be embedded into T-slots | Aluminum profile structures, fixture systems |
| U-bolt | U-shaped with threads at both ends, used to clamp round pipes or rods | Pipeline fixing, vehicle chassis |
| Bent Anchor Bolt | One end is bent and embedded in concrete, and the other end is connected to equipment | Fixing of building foundations |
| Straight Anchor Bolt | Connected to equipment flanges after being embedded in concrete | Foundation installation, equipment anchoring |
| Wheel Bolt | Specifically designed for connecting wheels and wheel hubs, requiring high strength | Automobiles, engineering machinery |
| Hexalobular Head Bolt | Hexalobular (Torx®) head for slip-resistance and high torque | Automobiles, electronic products |
| 12-Point Head Bolt | 12-point head design, compatible with special sockets, suitable for high-precision and high-torque connections | Engines, aerospace, racing cars |
Advanced Manufacturing Equipment
Powered by advanced production machinery, we uphold stringent manufacturing standards, delivering high‑performance fastener solutions built for the most demanding environments.
Thread Rolling Machine
High-efficiency thread rolling machine — for stronger and more precise threads.
Single-die Machine
Precision single-die machine — built for efficient standard bolts production.
Multi-Station Machine
Multi-station machine — made for complex and custom bolts and nuts.
Polishing Machine
An automated device used to improve the surface smoothness and appearance of bolts and nuts.
Salt Spray Testing Machine
A laboratory device used to evaluate the corrosion resistance of metals and coatings.
Brinell Hardness Tester
A Brinell hardness tester for bolts measures the hardness of materials to ensure strength and durability.
Complete Quality Inspection System
We execute real‑time dimensional verification, material composition validation and automated defect screening throughout every production phase. Full‑batch traceability records capture inspection data for audit compliance.
Screw Go/No-Go Gauge
A measuring tool used to verify whether a bolt thread meets standard dimensions. The “Go” gauge checks if the thread is within tolerance, while the “No-Go” gauge ensures it is not oversized or undersized.
Hardness Test
Used to measure the material hardness of bolts, evaluating strength and wear resistance to ensure compliance with design and application standards
Bolts Spectrum Test
Uses spectral analysis to determine the chemical composition of bolt materials, ensuring they meet standards and customer specifications.
Plating Test
Used to measure the thickness, adhesion, and uniformity of the bolt’s surface coating to ensure the plating meets quality standards.
Bolts Fatigue Test
Used to evaluate the durability of bolts under repeated loading or long-term stress, testing their fatigue strength and service life.
Salt Spray Test
Simulates salt spray environments to evaluate the corrosion resistance of bolt surfaces and the durability of their coatings.
Packaging and Shipment
The goods are packed in transparent plastic bags and sturdy cartons, and transported on special export wooden pallets. This packaging is suitable for land, sea and air transportation, ensuring the safe and timely delivery of goods to customers.
About Us
HK TONGLIN INTERNATIONAL LIMITED, branded as TONGLIN and also known as HKTL Fastener, specializes in fastener processing and CNC machined parts. The company has operated its own manufacturing facility in mainland China since 2011.
Equipped with advanced production machinery (including multi-station cold heading machines, thread rolling machines, and custom mold equipment) and a full range of testing instruments (torque testers, hardness testers, salt spray and hydrogen embrittlement testers), we ensure stable quality, precise tolerance control, and excellent corrosion resistance for every product.
Our products have been widly used in home appliance, furniture, mechanical equipment, electronics, construction, recreational facilities, medical devices, auto parts, aero industry etc. The products were exported to Europe, Africa, Middle East, Asia and other areas.
Our vision is to offer quality products and the most suitable solution to customers at a reasonable cost. Finally become a long-term partner of clients.
Authoritative certification
From raw material sourcing to finished product delivery, every stage is under strict quality control.
These certifications are not only a testament to our technical capability, but also a firm commitment to providing you with stable, reliable, and high-standard fastening solutions.
Real feedback
What our clients are saying.
A Customer in Africa
A Client in the Middle East
A Customer in Asia
A Client in Europe
Frequently Asked Questions
Here are practical answers to typical buyer questions for custom‑made bolts and nuts. Contact us for tailored technical solutions and quotation.
Q: What material options are available for bolts and nuts?
A: We supply bolts and nuts in carbon steel (Grade 4.8, 8.8, 10.9, 12.9), stainless steel (A2-70/304, A4-80/316), alloy steel, brass and aluminum. Custom material grades are available upon request.
Q: What surface finishes can you provide for this product?
A: Available surface treatments include zinc-plating, hot-dip galvanizing, black oxide, passivation and nickel-plating.
Q: Does this fastener meet RoHS / ISO standards?
A: Yes, we can provide products compliant with RoHS, ISO and other required certification upon request.
Q: Can I customize the size and thread of bolts and nuts?
A: Yes, we support custom dimensions, thread specifications and special shapes according to your drawings or samples.
Q: What is the tolerance control for custom bolts and nuts?
A: Normally we can reach tolerance ±0.02~0.05mm, the exact tolerance depends on product structure.
Q: Is the delivery time fast and reliable?
A: Yes, we offer fast and reliable delivery. Stock orders:7‑10 working days; custom fastener orders:15‑30 working days. Any potential delays will be communicated ahead of time.
We offer 24/7 consulting services and free samples.
With the advanced equipment and 15+ years of industry experience, we could meet your unique custom needs with an affordable cost.
- +86 136 2219 2628
- Mon - Fri: 9:00am - 6:00pm
- No.16 Shing Yip Street Kowloon Hong Kong
Consult our technical team
We provide comprehensive fastener solutions, not just products. Our engineers ensure your fastening strategy is optimized for safety and cost-efficiency.
As a leading source factory, we deliver high-efficiency industrial fastener solutions designed to optimize performance, ensure durability, and improve your supply chain.
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Contact
+86 13622192628
info@hktl-fastener.com
No.16 Shing Yip Street Kowloon Hong Kong
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