Specialized Fastener Manufacturer
HKTL Fastener supplies premium screws, bolts and nuts, washers, circlips, pins and CNC machined parts for diverse industrial applications globally. Direct from our manufacturing plant.
- Custom Solutions・Bulk Pricing
- Free Samples・Prompt Delivery
- Low MOQ・OEM/ODM Services
With over 15 years of experience in the professional fastener industry, our team members possess extensive manufacturing expertise.
We operate dozens of production machines across our facilities, including CNC lathes, automated machines, and other advanced equipment.
Partnering with giants like Midea and ZF, we understand diverse market needs and offer custom products with stable quality for clients.
You will receive the most suitable solution for custom fasteners, supported by a team that you can trust.
Bolts & Nuts - Complete Product Line
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
Fully Customizable
Premium Screws for Your Projects
- Material: Carbon Steel / Stainless Steel / Alloy Steel / Iron / Aluminum / Brass / Titanium
- Surface Treatment: Anodizing / Polishing / Zinc / Black Oxide / Phosphating / Passivation
- Screw Types: Cross-head Screws / Slotted Screws / Hex Socket Screws / Torx Screws / Self-tapping Screws / Countersunk Head Screws / Pan Head Screws / Wood Screws / Self-drilling Screws
Precision CNC machined parts
We could process various models of fasteners with different materials, including carbon steel, stainless steel, copper and aluminum, etc.
Resolve Customization Issues
Many fastener buyers face two common headaches: inconsistent product quality and long lead times. If your current supplier cannot resolve these customization issues, we provide reliable solutions.
We have accumulated years of experience in custom fastener manufacturing. We identify and resolve typical pain points in fastener machining processes.
We quickly convert your design drawings into functional samples and finished custom fasteners. This shortens your development cycle and saves your time and resources.
Our dedicated team supports you through the whole workflow: requirement communication, order confirmation, production tracking and after-sales service.
We deploy advanced testing equipment. Every custom fastener we produce meets your unique technical specifications and quality expectations.
ISO vs DIN vs ASTM: Key Differences
ISO, DIN, and ASTM are not interchangeable standard systems. ISO develops international standards, DIN develops German national standards and adopts many European and international standards, while ASTM International publishes technical standards covering materials, products, test methods, and performance requirements.
International Organization for Standardization
ISO develops international standards intended to support consistency across countries and industries.
Deutsches Institut für Normung
DIN is the German Institute for Standardization. DIN standards have historically played an important role in mechanical engineering and industrial fastener specifications.
ASTM International
ASTM International develops standards for materials, products, systems, and testing methods across a wide range of industries.
ISO 4014: Hexagon head bolts with partial thread.
ISO 4017: Hexagon head screws with full thread.
ISO 4032: Hexagon regular nuts.
ISO 898-1: Mechanical properties of carbon steel and alloy steel fasteners, including specified property classes for bolts, screws, and studs.
DIN 931: A legacy designation commonly associated with partially threaded hexagon bolts.
DIN 933: A legacy designation commonly associated with fully threaded hexagon bolts.
DIN 934: A legacy designation commonly associated with hexagon nuts.
ASTM F593: SS bolts, screws, and studs.
ASTM F594: Stainless steel nuts.
ASTM A193: Alloy-steel and stainless-steel bolting materials for specified high-temperature or high-pressure service applications.
ASTM A194: Carbon steel, alloy steel, and stainless steel nuts for ASTM A193 bolts.
Comparison of Common Fastener Materials
For industrial buyers and engineers, the best material is not necessarily the strongest, most corrosion-resistant, or most expensive option. It is the material that meets the application’s actual mechanical, environmental, manufacturing, and cost requirements.
| Material | Main Advantages | Limitations | Typical Considerations |
|---|---|---|---|
| Carbon steel | Widely used; can provide a broad range of strength levels; often economical | Unprotected material can corrode; properties depend on grade and processing | General machinery, equipment, and assemblies with appropriate corrosion protection |
| Alloy steel | Can achieve high strength and hardness through suitable processing | Heat treatment and hydrogen embrittlement risks may require careful control | High-load joints and mechanically demanding applications |
| Stainless steel | Corrosion resistance varies by grade; useful for many outdoor and industrial environments | Strength and corrosion behavior vary; galling and chloride corrosion can be concerns | Equipment, enclosures, food-processing environments, and outdoor assemblies where the selected grade is suitable |
| Titanium alloys | High strength-to-weight ratio and useful corrosion resistance in selected environments | Higher material cost; machining and sourcing can be more demanding | Weight-sensitive and specialized industrial applications |
| Brass | Useful electrical conductivity and corrosion behavior in suitable environments; relatively easy to machine in many grades | Generally not a substitute for high-strength steel fasteners; properties depend on alloy | Electrical components, instrumentation, and selected decorative or fluid-related applications |
| Aluminum alloys | Low density and useful corrosion behavior in suitable environments | Lower stiffness and strength than many steel grades; galvanic compatibility must be considered | Lightweight assemblies and applications where load requirements permit |
The Real Manufacturing Process Of Industrial Fasteners
Our skillful processing techniques and serious quality control measures provide your business with standout products in diversified application fields.
Collaborate with us for dependable, high-quality custom
fasteners solutions that enhance your product lineup and fulfill your business needs.
Professional Factory 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 fasteners production.
Multi-Station Machine
Multi-station machine — made for complex and custom fasteners.
Polishing Machine
An automated device used to improve the surface smoothness and appearance of fasteners.
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 fasteners measures the hardness of materials to ensure strength and durability.
Reliable Quality Control 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.
Go/No-Go Gauge
A measuring tool used to verify whether a fastener 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 fasteners, evaluating strength and wear resistance to ensure compliance with design and application standards
Spectrum Test
Uses spectral analysis to determine the chemical composition of fastener materials, ensuring they meet standards and customer specifications.
Plating Test
Used to measure the thickness, adhesion, and uniformity of the fastener’s surface coating to ensure the plating meets quality standards.
Fatigue Test
Used to evaluate the durability of fasteners 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 fastener surfaces and the durability of their coatings.
Fastener Quality Inspection Checklist for Buyers
For custom fasteners, share the drawing and critical-to-quality characteristics early. This helps the supplier understand which requirements must be controlled and which inspection records are necessary for acceptance. Use this condensed checklist before approving an order or releasing a shipment.
- Approved drawing, part number, and revision confirmed
- Applicable standards and acceptance criteria identified
- Dimensions and tolerances defined
- Thread designation and fit requirements confirmed
- Material and mechanical property requirements confirmed
- Surface finish and corrosion requirements specified
- Critical characteristics and required tests identified
- Sampling plan and lot definition agreed
- Required inspection reports and certificates identified
- Lot identification and traceability requirements confirmed
- Nonconformance handling and disposition process agreed
- Final inspection and shipment-release requirements documented
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.
Quality Assurance
How to customize your fasteners?
Step 1. Inquiry
Send your drawings to us firstly, and check all technical details with our engineer team.
Step 2. Sample Production
Confirm a sample order and arrange sample making. We will deliver the sample by courier within several days.
Step 3. Bulk Order
After testing the sample, if it is ok, we will sign a contract for bulk order, then arranging shipment after completion of production.
What Information Should You Include in a Custom Fastener RFQ?
A complete request for quotation helps a supplier evaluate feasibility, identify open technical questions, and provide a more meaningful commercial proposal. Use the following checklist when preparing your RFQ.
Technical information
Engineering drawing with part number and revision
Material grade and required mechanical properties
Thread specification and critical dimensions
Surface finish, coating, and corrosion requirements
Applicable standards and customer specifications
Required inspection and documentation
Commercial information
Prototype, initial order, and expected order quantities
Estimated annual demand, if known
Target delivery requirements
Packaging and labeling instructions
Delivery destination and shipping requirements
Tooling ownership or return requirements, if applicable
Application information
Intended function and mating components
Installation method and assembly conditions
Operating temperature and environmental exposure
Relevant loading, vibration, or fatigue considerations
Any regulatory, traceability, or customer-specific requirements
Got An Idea In Mind?
Partner with us to gain a competitive edge in your local market!
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.
We supply screws, bolts and nuts, washers, circlips, pins and CNC machined parts. With a monthly production capacity of over 5 million units, we deliver fastening solutions to customers worldwide, including non-standard fasteners and custom metal processing components.
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
Q: What products can you customize?
A: We provide custom screws, bolts, nuts, washers, rivets, pins, CNC machined parts, etc. We support custom materials, dimensions and drawings.
Q: What is your minimum order quantity (MOQ)?
A: Low MOQ, negotiable for custom orders.
Q: Can I get fastener samples?
A: Samples are available. Samples are free of charge, but freight is borne by the buyer.
Q: Do you accept OEM & ODM for fasteners?
A: Yes, OEM and ODM services are supported. We can produce according to customer drawings, specifications or physical samples.
Q: What materials are available?
A: Carbon steel, stainless steel, alloy steel, brass, aluminum, etc.
Q: What surface treatments can you do?
A: Zinc‑plating, hot‑dip galvanizing, black oxide, passivation, nickel‑plating, etc.
Q: What is your production lead time?
A: Normally 7‑30 working days, depends on order quantity and customization complexity.
Q: What shipping options do you offer?
A: Sea freight, air freight and express delivery are available, based on customer requirements.
Get Free Sample Now !
We offer 24/7 consulting services and free samples.
Try our fastener samples. See the quality for yourself and let’s start our collaboration right now.
Feel free to ask any questions to us
- +86 136 2219 2628
- Mon - Fri: 9:00am - 6:00pm
- No.16 Shing Yip Street Kowloon Hong Kong
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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