Welcome to Luoyang Kewei RF Technology Co., Ltd., we will serve you wholeheartedly!
Product pictures
These‑angle photographs exhibit our D38999/20WC04SN circular connector.
Front‑side view shows the 4‑pin female receptacle with green coded insulator, square flange mounting base and matching rubber sealing gasket. The side shot displays the threaded metal housing, printed part‑number mark and dual‑color sealing rings.
Complete supporting accessories are arranged around the main body, including gold‑plated spare contact pins and plastic pin‑extraction tools for convenient assembly and wire maintenance.
Product description
D38999/20WC04SN is a robust threaded‑locking circular industrial connector for heavy‑duty wiring work.
Built‑in durable metal shell and high‑performance insulating insert deliver steady signal and power transmission. The square‑flange structure suits panel‑mount installation, while the built‑in sealing rings offer fine dust‑proof and moisture‑resistant capacity.
Delivered with extraction tools and spare contacts, this 4‑pin connector fits outdoor machinery, automation equipment, transport‑related electronics and harsh‑condition control devices.
Workshop
Here is our‑owned factory that deals with the complete production work for heavy‑duty circular connectors.
Almost every component gets manufactured and processed right in our plant. We will never outsource core‑part processing to external‑third‑party factories.
We keep several CNC lathe machines in‑house. Our workers cut raw alloy materials and machine tough metal connector shells on‑site.
Our local workshop team works on mould designing, sample testing and fine adjustments by hands.
We have stacks of finished mould tools stored inside the workshop. These tools help us turn out large‑volume insulators and wear‑resistant silicone fittings steadily, so we can keep up with big‑batch client orders.
Many small‑sized yet essential accessories, including contact faces, locating keys, claw‑type springs and conductive shielding springs, are all made by our own production staff.
Special‑purpose machinery cuts, grinds and polishes our contact pins. Every single pin strictly follows the M39029 international manufacturing specification for stable conductivity and anti‑oxidation capacity.
When our factory first got started, we regularly shipped large‑quantities of industrial‑grade connectors for China AVIC Group.
Our experienced assembly‑workers take plenty of care throughout every assembling move.
After assembly work wraps up, staff carry out repeated manual inspections, vibration tests and appearance checks.
We go through every finished‑unit carefully, making sure each connector satisfies all official MIL‑DTL‑38999 manufacturing standards and works reliably under harsh industrial environments.
Exhibition
Great client service is something our team always prioritizes. We aim to deliver a pleasant buying journey for every overseas partner. We make regular trips to major electronics trade fairs around the industry. These in‑person meet‑ups make it simple for us to chat with buyers, gather real‑world usage feedback and work out ways to refine our goods. Face‑to‑face conversations like these allow us to build dependable, long‑lasting business partnerships with clients all over the world.
Package
Wondering how we pack connectors before shipment? Let me walk you through our real packing routine step by step.
First off, every unit gets wrapped with soft tough anti-scratch foam right before leaving our workshop. Rough highway and sea shipping always bring bumps and friction, and this foam keeps metal shells free of ugly scratches that often come from poor packaging.
After foam wrapping, we place each connector into a separate ESD sealed box. These internal pins and inserts are extremely delicate; static electricity can burn out tiny parts without visible signs. This sealed box blocks static risk entirely, and it’s one of our most important protective steps.
Our packing team will double-check every finished package manually. Only confirmed good items go into reinforced dedicated cartons. We print part number, batch count and total quantity clearly on carton surfaces, so your warehouse team can sort and stock goods quickly once delivery arrives.
You can pick international express, air freight or sea shipping freely. Our logistics team adjusts arrangements fully to match your preferred delivery method.
All outer cartons go through extra reinforcement work. They resist compression and shock far better than ordinary generic cartons.
Long cross-border shipments always have shaking and squeezing on the way. Our layered packing design absorbs most impact, cuts transit damage greatly, and makes sure every single connector lands intact at your site.
| Type | Conncetor |
| Contact Materia | Gold‑plated copper alloy |
| Housing | High‑strength aluminum‑alloy anti‑corrosion metal casing |
| Insulator | High‑temperature‑resistant thermoplastic |
| Included Accessories | Mounting gasket, pin removal tools, spare contacts |
| Main Features | Vibration‑resistance, shielding property, waterproof and dustproof |
| Common Application | Industrial automation systems, outdoor‑use machines, transportation electronic hardware |
Why choose us？
1. With its own molds, it can achieve large-scale production. The molds have been repeatedly finely engraved, ensuring the insulation structure and quality from the very beginning!
2. We have professional shell processing manufacturers. The shell materials and structures are completely consistent with Amphonel and fully comply with the MIL-DTL-38999 standard.
3. We have our own contact component production line. The quality of the contact components fully meets the M39029 standard!
4. Our workers have undergone strict training and produce according to the production process of standard connectors strictly.
5. After all products are assembled, each product will undergo individual quality inspection and then be packaged and shipped.
FAQ：
1. who are we?
We are based in Henan, China, start from 2025,sell to Mid East(50.00%),Domestic Market(30.00%),Southeast Asia(20.00%). There are total about 51-100 people in our office.
2. how can we guarantee quality?
Always a pre-production sample before mass production;
Always final Inspection before shipment;
3.what can you buy from us?
MIL-DTL-38999 Series connectors,militray connectors,Aorespace connectors,MS27484 series connector,Arinc 600 Series connectors
4. why should you buy from us not from other suppliers?
Our engineering team is come from AVIC, and we have a specialized R & D team for product development. With a wealth of ready - made molds, we can ensure large - scale production. To guarantee product quality, we have inspection equipment and a laboratory.
5. what services can we provide?
Accepted Delivery Terms: FOB,CIF,EXW,Express Delivery；
Accepted Payment Currency:null;
Accepted Payment Type: T/T,L/C,D/P D/A;
Language Spoken:English
