Trailer Security Products
& OEM Die Casting Solutions

Reliable trailer locks and custom metal components
from a 20+ years die casting manufacturer.

Coupler lock installed inside a trailer coupler cavity on an RV camper

Engineering Experience Behind Every Product

Many suppliers can manufacture products. RuiYu focuses on helping customers develop products that are practical, reliable and suitable for mass production.

🛡️ 20+ Years Die Casting Experience

Deep understanding of tooling, die casting processes and manufacturing challenges.

🏭 Product Development Support

From design review to manufacturing coordination, we help reduce development risks.

🔬 China Manufacturing Resources

Connecting customers with suitable manufacturing partners according to project requirements.

Trailer Security Products

50D Trailer Coupler Socket Lock

Trailer Coupler Locks

Heavy-duty trailer coupler locks designed for RV trailers, campers and utility trailers. OEM and custom solutions available.

RuiYu 5/8-inch trailer hitch pin lock

Trailer Hitch Pin Locks

Reliable hitch receiver locking solutions engineered for 2-inch and 2.5-inch receivers with OEM customization options.

Die Casting Components

speaker frame basket

Aluminum Speaker Basket Manufacturer

OEM aluminum speaker baskets from 6.5 to 24 inches.
We provide customized die casting solutions for professional audio manufacturers, including mold development, surface treatment, and mass production.

die-cast aluminium tube radiators

Custom Die Casting Components

Custom aluminum and zinc alloy die casting parts manufactured from mold design to finished components.Ruiyu supports OEM projects with precision casting, CNC machining, and surface finishing.

Engineering Experience & Manufacturing Solutions

From product design and mold development to mass production, Ruiyu helps customers solve manufacturing challenges with reliable die casting solutions.

Comparison of two different trailer hitch ball designs for trailer lock compatibility

CASE STUDY 01

Trailer Coupler Lock Structure Optimization for Improved Die Casting Quality

Challenge:Traditional trailer coupler lock designs combined the ball head and housing into a single die casting component, creating challenges in mold design, metal flow control, and casting quality.

Solution: Ruiyu optimized the product structure by separating the ball head and housing, improving die casting feasibility and reducing wall thickness issues during production.

OEM die cast aluminum conveyor belt pull cord switch components engineering case

CASE STUDY 02

Aluminum Die Casting Housing Achieved 1000+ Hours Salt Spray Resistance

Challenge:The customer required improved corrosion resistance for an aluminum die casting housing used in outdoor environments.

Solution: Ruiyu optimized the surface treatment process by combining electrophoresis coating and weather-resistant powder coating.

How We Support Your Project

1

Product Review

Evaluate design, material and manufacturing feasibility.

2

Tooling Development

Coordinate mold design and manufacturing.

3

Production

Support die casting and secondary processing.

4

Surface Treatment

Coordinate finishing solutions according to requirements.

 

5

Quality Verification

Inspect dimensions, surface quality and mechanical properties.

Manufacturing & Supply Chain Resources

RuiYu integrates premium manufacturing resources in China’s hardware capital to provide flexible, reliable, and scalable production solutions tailored to global industrial standards.

die cast tooling Design

Mold Design

Aluminum Die Casting Workshop

Die Casting Production

Four-axis CNC

CNC Machining

High precision CMM coordinate measuring machine for die casting quality inspection

Product CMM Inspection

About RuiYu

RuiYu was founded on more than 20 years of die casting industry experience.

Our mission is to bridge the gap between product ideas and reliable manufacturing solutions.

By combining engineering knowledge with China manufacturing resources, we help customers develop and source better products.

1.Die Casting Mold Design

Have a New Product Idea?

Let’s discuss how we can support your next OEM/ODM project

Get A Free Quote Now !

Contact Form Demo (#3)