D38999/20FJ4PN Fiber Optic Connectors for Signal Transmission

Product pictures

These photos display the D38999/20FJ4PN circular connector from front and side views.

It includes a square mounting flange, sealing gasket, labelled‑pin insulator, pin‑removal tools and spare contacts. The metal threaded shell and built‑in sealing rings deliver good dust‑proof performance for panel‑mount installation.

Product description

D38999/20FJ4PN is a heavy‑duty threaded‑lock circular industrial connector.Its sturdy metal casing and multi‑pin insert guarantee stable power and signal transmission. Equipped with full installation accessories, it adapts well to automation gear, outdoor machinery and electronic control systems for tough‑environment wiring tasks.

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

Our team keeps taking part in major electronics‑industry trade fairs. We aim to bring shoppers a far more satisfying service experience.

At these on‑site gatherings, our staff get the chance to chat face‑to‑face with clients. We go over real‑world product usage feedback, alongside practical plans for function upgrades.These industry expos also serve as a handy channel for us. We manage to deepen existing cooperation ties with long‑time partners, while forging fresh‑new business connections with brand‑new customers.

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.

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