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Precision Hardware Solutions from China

Ruian Mingding Hardware Co., Ltd – A trusted manufacturer of cotter pins, slotted spring pins, coiled spring pins, E-type circlips, and custom non-standard parts for over 10 years.

About Mingding Hardware

Ruian Mingding Hardware Co., Ltd is a professional manufacturer specializing in precision fasteners and hardware components. With over a decade of experience, we have built a strong reputation for quality, reliability, and technical expertise in the global market.

Our product range includes cotter pins (GB879, DIN1481), slotted spring pins, coiled spring pins, E-type circlips, standard internal and external circlips, and a wide variety of non-standard punching parts tailored to customer specifications.

Over 10 years of manufacturing experience
Compliant with American, German, UK, and ISO standards
Advanced QC systems and R&D capabilities

Certifications & Standards

ASME/ANSI B18.8.1-2000
DIN94
GB91
ISO1234
B.S. Standards
DIN1481

Our products meet international quality benchmarks and are widely used in automotive, machinery, electronics, and industrial equipment sectors.

Our Products

High-quality, precision-engineered hardware components designed for durability and performance across industries.

Cotter Pins

GB879, DIN1481 compliant | M1×8 to M10×140

  • • High tensile strength carbon steel
  • • Corrosion-resistant surface treatment
  • • Used in shaft retention and hinge applications

Slotted Spring Pins

DIN94, ISO1234 | M1.5×5 to M12×100

  • • Slit along full length for flexibility
  • • Self-retaining under vibration
  • • Ideal for pivot points and linkages

Coiled Spring Pins

ASME B18.8.1 | M2.5 to M12

  • • Hollow coiled design for high shear strength
  • • Excellent fatigue resistance
  • • Suitable for dynamic loading

E-Type Circlip (E-Washer)

M2 to M15

  • • External retaining ring with E-profile
  • • Secure fit on shafts and grooves
  • • Easy installation and removal

Standard External Circlips

Metric & Imperial sizes

  • • Precision stamped from spring steel
  • • Uniform tension and grip
  • • Used in automotive and industrial assemblies

Standard Internal Circlips

For bore retention

  • • Fits into housing bores
  • • Prevents axial movement of components
  • • High resilience and durability

Non-Standard Punching Parts

Custom shapes and sizes

  • • Tailored to client drawings
  • • Rapid prototyping available
  • • Materials: carbon steel, stainless steel, brass

Opening Taper Pins

Precision tapered design

  • • Self-locking feature
  • • Accurate alignment in mating parts
  • • Reusable and reliable

Spring Pins – Heavy Duty

For high-load applications

  • • Increased wall thickness
  • • Superior load-bearing capacity
  • • Used in construction and agricultural machinery

Miniature Cotter Pins

M1 to M3 sizes

  • • For delicate mechanisms
  • • Precision formed tips
  • • Common in electronics and instruments

Stainless Steel Circlips

AISI 304 / 316

  • • Excellent corrosion resistance
  • • Suitable for marine and food-grade environments
  • • Long service life

Brass Spring Pins

Non-magnetic & conductive

  • • Ideal for electrical grounding
  • • Resistant to sparking
  • • Used in hazardous environments

Why Choose Mingding?

Quality Assured

Rigorous QC processes ensure every batch meets international standards.

Fast Delivery

Efficient production and logistics for on-time global shipments.

Custom Solutions

Capable of producing non-standard parts per customer specifications.

Global Export

Trusted by clients across Europe, North America, and Asia.

10+
Years Experience
50+
Global Clients
200+
Product Variants
10M+
Units/Year Output

Frequently Asked Questions

What standards do your products comply with?

Our cotter pins, slotted spring pins, and coiled spring pins meet ASME/ANSI B18.8.1-2000, DIN94, GB91, ISO1234, B.S., and DIN1481 standards.

Can you produce custom non-standard parts?

Yes, we specialize in manufacturing non-standard punching parts based on customer drawings and specifications.

What materials do you use?

We use carbon steel, stainless steel (AISI 304/316), brass, and other materials as per application requirements.

Do you offer samples?

Yes, we provide free samples for evaluation. Please contact us through the official website for sample requests.

What is your minimum order quantity (MOQ)?

MOQ varies by product type and customization level. Contact us for specific details based on your needs.

Get in Touch

For inquiries, quotes, or technical support, please visit our official website to contact the team directly.

Contact Information

Company: Ruian Mingding Hardware Co., Ltd

Address: Wufang Industrial Zone, Changqiao, Tangxia, Ruian, Zhejiang, China

Phone: +86 577 65295826

Mobile: 18958876066 (Alice)

Email: alice_qian77@hotmail.com

Visit Official Website to Contact

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