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Precision Rubber & Metal Auto Parts

OEM & ODM Manufacturer of High-Quality Automotive Components, Flanges, Gaskets, Seals, and CNC Machined Parts from Ningbo, China

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About Relong Auto-Parts

Located in Ningbo, China, Relong Auto-parts Co., Ltd. is a privately held company established in 2006 through the integration of two specialized factories. We are a trusted manufacturer of precision rubber and metal components serving global industries including automotive, telecommunications, electronics, medical, aerospace, and industrial equipment.

With a strong commitment to innovation and quality, Relong delivers OEM and ODM solutions from concept development and prototyping to full-scale contract manufacturing. Our collaborative approach ensures we meet the exacting standards of our international clients.

Established in 2006
OEM & ODM Services
Global Customer Base
Relong Factory Interior

Our Manufacturing Capabilities

Relong combines advanced technology with skilled craftsmanship to deliver precision-engineered components across multiple processes.

Precision Machining

CNC turning, milling, and multi-axis machining for tight-tolerance metal components used in hydraulic, automotive, and industrial systems.

Die-Casting & Stamping

High-pressure aluminum and zinc die-casting, along with precision stamping for complex structural and functional parts.

Rubber Molding

Injection, compression, and transfer molding of NBR, EPDM, silicone, and other elastomers for seals, gaskets, and dampers.

Tool & Die + Assembly

In-house tooling design and fabrication, supported by full product assembly and quality testing services.

Our Product Range

Custom-engineered components for demanding applications across industries

Rubber Gasket

Rubber Gasket

Custom-molded gaskets in NBR, EPDM, and silicone for sealing applications in automotive, HVAC, and industrial systems.

  • High temperature resistance
  • Oil and chemical resistant
  • Custom shapes and durometers
Rubber Seal

Rubber Seal

Precision-engineered dynamic and static seals for hydraulic, pneumatic, and rotating shaft applications.

  • Low friction and wear
  • Pressure-rated up to 300 bar
  • FDA-compliant options available
Precision Hot Forging Flanges

Precision Hot Forging Flanges

Stainless steel flanges produced via hot forging for superior strength and reliability in piping systems.

  • ASTM/ASME standards
  • Sizes from 1/2" to 24"
  • Custom pressure classes
Stainless Steel Machining Housing

Machined Housing for Hydraulics

CNC-machined stainless steel housings for hydraulic accessories with tight tolerances and smooth finishes.

  • IP67 sealing compatibility
  • Corrosion-resistant finish
  • Custom port configurations

Automotive Components

Structural and functional die-cast and machined parts for chassis, powertrain, and body systems.

  • Aluminum and zinc alloys
  • T6 heat treatment
  • PPAP and IMDS support

Metal Fittings

Custom brass, stainless steel, and carbon steel fittings for fluid and gas transfer systems.

  • Threaded, flare, and push-fit
  • Leak-tested to 1.5x working pressure
  • RoHS and REACH compliant

CNC Machining Services

End-to-end CNC machining for prototypes and production runs in steel, aluminum, and exotic alloys.

  • 3 to 5-axis capabilities
  • Tolerances down to ±0.005mm
  • First-article inspection reports

Custom OEM/ODM Solutions

Full-service product development from design support to packaging and logistics.

  • DFM and FEA analysis
  • Rapid prototyping
  • JIT and VMI delivery options

Why Choose Relong?

Quality Certified

ISO 9001 compliant processes with rigorous in-house testing and inspection protocols.

Global Reach

Serving customers in North America, Europe, Asia, and beyond with reliable logistics.

Engineering Support

Dedicated technical team for design, material selection, and manufacturing optimization.

On-Time Delivery

Consistently >98% on-time delivery rate with flexible production scheduling.

Industry Insights

Latest trends and technical discussions in automotive and die-casting manufacturing

Technical Discussion

Aided Techniques in Automotive Aluminium Die Casting

Structural parts require guaranteed mechanical strength and load-bearing capacity. Advanced simulation and process control enhance casting integrity.

Published: March 26, 2020
Market Analysis

China's Automotive Die Casting Industry Trends

Growing demand for precision die-castings in automotive, electronics, and industrial sectors drives innovation and capacity expansion.

Published: March 26, 2020
Technology

Dissimilar Materials Joining in Aluminum Parts

Joining aluminum with other materials without adhesives or fasteners improves performance and reduces weight in vehicle systems.

Published: March 26, 2020

Get in Touch with Relong

Contact our team for quotes, technical inquiries, or partnership opportunities. We respond to all messages within 24 hours.

Phone

+86-0574-88106851

Email

sales@relong.cn

jett@relong.cn

Location

11/F, South Building, No. 1299, East Yinxian Avenue, Ningbo, China

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