| Product Name | Torsion spring for garage door parts |
| Inner Diameter | 1 3/4'', 2'', 2 5/8'', 3 3/4'',5 1/4”, 6” |
| Wire Size | 207/218/225/234/243/250 |
| Material | Carbon steel / Manganese steel |
| Surface Treatment | zinc plated, electrophoresis, oxidation black, powder coating, blasting, geomet, rust-preventative oil, nickel plated, etc. |
| Packaging | inner plastic bag, outer standard carton box.Or at your request. |
| Certificate | ISO/TS16949-2002, ISO9001-2000, ISO14000 |
| Lead Time | samples:3-7 days; batch goods: 7-15 days after deposit recieved. |
| Payment Term | T/T, L/C, western union, paypal, etc. |






For further inquiries or to place an order, please feel free to contact us!


Dongguan Ganggu Hardware Product Co., Ltd
Your Premier Partner in Precision Fasteners
Dongguan Ganggu Hardware Product Co., Ltd, situated in Dongguan City, Guangdong Province, is a leading manufacturer specializing in high-quality fasteners. Our modern facility spans 2000 square meters and employs a skilled team of 60 professionals. In addition to our main operation, we also have a branch factory in Vietnam, offering Vietnamese certificates of origin for our products.
Our Expertise
With an impressive annual production capacity of 200 million units, we leverage our extensive industry experience to deliver exceptional fasteners tailored to your needs.

Our product range includes:
* Screws
* Shafts & Pins
* Nuts and Bolts
* Washers
* Threaded Rods
* Straight Pins
* Standard and Non-Standard Fasteners
* CNC Machining Services
We can manufacture screws as small as M0.5 and are continuously innovating to develop new products to meet diverse requirements. We welcome both OEM and ODM orders to accommodate your unique specifications.

*Quality AssuranceAt Dongguan Ganggu, we are committed to maintaining the highest standards of quality. Our rigorous quality control process includes advanced testing equipment:
* Vickers Hardness Tester
* Rockwell Hardness Tester
* Projector
* Salt Spray Test Machine
* Pull-Thrust Meter
* Torque Tester
These tools ensure that every product meets our stringent quality standards, guaranteeing reliability and performance.
Partner with Dongguan Ganggu Hardware Product Co., Ltd for precision fasteners and unmatched service. Contact us today to learn more about our products and how we can support your manufacturing needs.







Q1: Are you a trading company or a manufacturer?
A: We are a comprehensive industry and trade company, specializing in both manufacturing and trading.
Q2: What type of production equipment do you have, and what are your main products?
A: We utilize a range of advanced manufacturing equipment, including cold molding machines and automatic lathes. Our primary products include non-standard precision electronic screws, precision shafts and pins, and other lathe products.
Q3: Why should I choose your company? What are your advantages, and which industries do you serve?
A: With over a decade of experience in the fastener industry, we offer professional manufacturing and management expertise. Our factory is ISO 9001 certified, ensuring high-quality products and reliable service. We not only provide top-notch fasteners but also offer comprehensive solutions in production design, process optimization, packaging, and after-sales support. Customer satisfaction is our top priority.
Q4: In which industries are your products typically used?
A: Our fasteners are suitable for a variety of industries, including electronics and PC, machinery equipment, concrete, outdoor equipment, sheet metal chassis cabinets, and the ocean chemical industry.
Q5: Can you supply related products, such as hex allen keys (allen wrenches) for hex socket head cap screws, and other supporting items?
A: Yes, in addition to our fasteners, we also provide related products such as nuts, springs, washers, stamping parts, and tools like hex allen keys (allen wrenches) for hex socket head cap screws. If you need other items, please let us know, and we will do our best to source them for you.
Q6: How can I address specific fastener challenges or requirements?
A: We are experts in fasteners and are here to help solve any issues or meet specific requirements you may have. Feel free to challenge us with your fastener needs, and we will provide the best solutions.
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