Finding a reliable castle nut supplier in China isn’t easy, especially if you’re sourcing for large-scale industrial or automotive projects. I’m Monica from Shanghai Hengrui Industry Co., Ltd., and with over 15 years of experience in the fastener industry, I’ve worked with B2B clients worldwide to find the best sources.
So today, I’ve compiled a trusted list of Top 10 Castle Nut Manufacturers in China, ideal for buyers like My Client from Canada or any procurement lead looking for certified quality, fair pricing, and fast delivery.
Company Overview: Established in 2021, Shanghai Hengrui focuses on high-performance fasteners including castle nuts, standard nuts, bolts, and washers. With ISO 9001 and RoHS certifications, we serve the automotive, machinery, oil & gas, and construction industries globally.
Established: 2021
Location: Shanghai
Main Products: Castle nuts, bolts, Screw, nuts, washers, and custom fasteners, machined parts, stamping parts
Our specialty lies in customization, quick turnaround, and guaranteed quality. Whether you need DIN, GB, or ANSI standard castle nuts, we can produce them to spec with full QA documentation.
Company Overview: Founded in 1999, OuKaiLuo is one of China’s top hardware suppliers, offering a full catalog of nuts, bolts, screws, and washers.
Established: 1999
Location: Ningbo, Zhejiang
Main Products: Castle nuts, screws, bolts, washers
They’ve passed ISO, RoHS, SGS, and BV certifications. Their castle nuts are widely used in machinery, auto, and general industrial applications, and exported to North America, Europe, and Southeast Asia.
Company Overview: Qimu is known for reliable supply of castle nuts, screws, and anchor bolts with consistent quality control.
Established: Not specified
Location: Jiaxing, Zhejiang
Main Products: Castle nuts, screws, anchors, washers
They manufacture according to DIN and ANSI standards, ideal for construction and automotive buyers needing bulk production.
Company Overview: HISENER has been producing specialized nuts like flange, lock, and castle nuts since 2004. Their exports reach 55+ countries.
Established: 2004
Location: Haining, Zhejiang
Main Products: Castle nuts, flange nuts, lock nuts
With CE and ISO certifications, their products are especially popular in the auto and construction industries.
Company Overview: A dedicated Chinese manufacturer of zinc-plated steel castle nuts. Known for strong durability and competitive prices.
Established: Not specified
Location: China
Main Products: Zinc-plated castle nuts
Their focus is on high-strength materials and industry-compliant design, with strong performance across building and industrial machinery.
Company Overview: TopKun is a veteran in the standard and non-standard fastener game, offering certified castle nuts at scale.
Established: 2006
Location: Shanghai
Main Products: Castle nuts, high-strength bolts
They’re ISO9001 certified, and definitely built for large-volume OEM orders. If you’re looking for consistent pricing and steady output for export, they’re a great fit.
Company Overview: Founded in 2010, XIYI supplies DIN and ISO-compliant nuts and bolts, with strong attention to machining precision.
Established: 2010
Location: Yangzhou, Jiangsu
Main Products: Castle nuts, bolts, screws
They are reliable for small-to-medium OEM clients needing consistent supply and professional customer service.
Company Overview: Hongrui focuses on certified fasteners for export, including CE and RoHS approved castle nuts.
Established: Not specified
Location: Dongguan, Guangdong
Main Products: Castle nuts, bolts
They put global standards front and center, with a strong focus on meeting the strict requirements of European and North American clients.
Company Overview: A factory specializing in high-volume standard parts, including castle nuts for industrial use.
Established: Not specified
Location: Changshu, Jiangsu
Main Products: Castle nuts, standard fasteners
They offer low cost, reliable quality, and scalable production—perfect for distributors and bulk order buyers.
Company Overview: Founded in 2005, Aozhan Industrial produces precision castle nuts for aerospace, auto, and high-tech sectors.
Established: 2005
Location: Hangzhou, Zhejiang
Main Products: Castle nuts, other precision fasteners
Their parts are made with precise tolerance control and are trusted by industries that demand high mechanical performance.
Q1: What is a castle nut used for?
A: Castle nuts are designed to be used with a cotter pin and drilled bolt for locking. They are used in automotive, aerospace, construction, and military assemblies.
Q2: Can I request samples before placing a bulk order?
A: Yes! Most of these suppliers offer free samples—just pay for the freight.
Q3: Do they offer OEM/custom design?
A: Absolutely. Nearly all top suppliers in this list accept OEM orders with your drawings or technical specs.
Q4: What materials are available for castle nuts?
A: Common materials include carbon steel, stainless steel (304/316), zinc-plated steel, and custom alloy materials.
| Company Name | Location | Established | Main Products |
|---|---|---|---|
| Shanghai Hengrui Industry Co., Ltd. | Shanghai | 2021 | Castle nuts, bolts, Screw, nuts, |
| Ningbo OuKaiLuo Hardware Co., Ltd. | Ningbo, Zhejiang | 1999 | Castle nuts, bolts, screws, washers |
| Jiaxing Qimu Trading Co., Ltd. | Jiaxing, Zhejiang | — | Castle nuts, screws, anchor bolts |
| HISENER Industrial Co., Ltd. | Haining, Zhejiang | 2004 | Castle nuts, flange nuts, lock nuts |
| Wanshsin-fast | China | — | Zinc-plated steel castle nuts |
| Shanghai TopKun Industry Co., Ltd. | Shanghai | 2006 | Castle nuts, high strength bolts |
| Yangzhou XIYI Fasteners Co., Ltd. | Yangzhou, Jiangsu | 2010 | Castle nuts, bolts, screws |
| Dongguan Hongrui Hardware Tech Co., Ltd. | Dongguan, Guangdong | — | Castle nuts, bolts |
| Changshu Standard Parts Factory Co., Ltd. | Changshu, Jiangsu | — | Standard castle nuts, fasteners |
| Aozhan Industrial Co., Ltd. | Hangzhou, Zhejiang | 2005 | Precision castle nuts & fasteners |
Castle nuts are small—but they hold some big responsibilities. Whether you’re working on vehicle assemblies, structural frameworks, or industrial machines, the right supplier makes all the difference.
These 10 Castle nuts company are among the most trusted in China.
If you’re not sure which one fits your need, feel free to reach out to me. I’m Monica from Shanghai Hengrui, and I’m here to make your sourcing simpler.
Contact Hengrui Fastener for Custom Castle nuts
For specialized applications that require custom solutions, Hengrui Fastener offers high-quality, customizable Castle nuts and fasteners. Whether you need a specific size, material, or finish, Hengrui can provide tailored fasteners to meet your exact requirements. Contact Hengrui Fastener to learn more about our products and services.
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