M18-4P Male & Female Matching Aviation Socket, Wire Solder Type, 2.8mm & 3.7mm PCB Solder Tail Length, 0.4U Gold Plating, Product is supplied complete with matching waterproof gaskets and lock nuts.

All structural dimensions, electrical performance, material configuration and accessory specifications of this M18-4P male and female aviation socket set are tested in strict accordance with industrial circular connector standards. The core PC parameter represents the PCB solder tail length, referring to the reserved pin length protruding from the insulator for PCB through-hole soldering, instead of pin pitch. Complete standardized parameters are listed below for customer selection, structural design and engineering verification.

Technical Note: The PC parameter in this product strictly refers to PCB solder tail length, which is the reserved pin length extending from the insulator for PCB through-hole soldering, not pin pitch. The male 2.8mm and female 3.7mm differentiated tail lengths provide targeted soldering margins for different assembly requirements, ensuring sufficient welding depth, firm solder joint connection and effectively avoiding virtual soldering or falling-off issues. While the 0.4U thick gold plating guarantees long-term stable conductivity in complex industrial environments.

2.1 Differentiated PCB Solder Tail Design for Precise Welding

This M18-4P connector set adopts a professional differentiated solder tail length design. The male socket features 2.8mm PCB solder tail length for compact PCB board installation, suitable for dense layout and small-space welding scenarios. The female socket is upgraded with 3.7mm extended solder tail length, offering longer reserved welding margin for thicker PCB boards or high-current welding requirements. This reasonable length matching ensures full penetration welding, stable solder joint formation and high assembly consistency, greatly improving the yield rate of PCB welding and on-site wiring construction quality.

2.2 Solid Pin + 0.4U Gold Plating for Superior Conductivity

Adopting integral solid machined phosphor bronze pins, the contacts feature high structural rigidity, strong deformation resistance and excellent elastic recovery. Different from thin-wall hollow pins, the solid pin structure supports 8A stable current transmission per pin and maintains stable contact performance after long-term vibration and frequent plugging. The 0.4U thickened gold-plated layer is uniform and dense, effectively isolating air oxidation, humid corrosion and industrial oil pollution. It keeps ultra-low and stable contact resistance for a long time, eliminating signal drift, intermittent disconnection and power instability caused by contact oxidation, and greatly improving the overall service life of the connector.

2.3 Exclusive Color Gaskets & Custom Lock Nuts for Error-proof Assembly

The male and female sockets are equipped with exclusive matching accessories with obvious color and structural differences. The male connector is matched with a hexagonal lock nut and light yellow waterproof gasket, while the female connector is equipped with a standard lock nut and light red waterproof gasket. The intuitive color distinction helps construction personnel quickly identify male and female accessories during installation, completely avoiding wrong assembly, mismatching and accessory confusion. The high-precision matched lock nuts provide stable clamping force to prevent loosening caused by mechanical vibration, while the high-elastic silicone gaskets form a tight sealing barrier to block dust, splash water and humid air invasion.

2.4 IP67 Full Sealing Performance for Harsh Environment Resistance

With the cooperation of precision thread locking and double-color waterproof gaskets, the entire connector assembly reaches IP67 dustproof and waterproof level after complete mating and compression. It can effectively resist rain splash, outdoor dew, workshop dust, oil mist and corrosive gas erosion. The gaskets feature excellent high and low temperature resistance and aging resistance, without hardening, deformation or elasticity attenuation after long-term compression and alternating temperature changes. It effectively prevents circuit short circuit, pin corrosion and signal failure caused by moisture and dust intrusion, ensuring stable operation of equipment circuits in harsh industrial and outdoor environments.

2.5 Flexible Wire-solder Structure for Diversified Installation

This product adopts a universal wire-soldering structure, supporting both on-site cable soldering and PCB board through-hole welding. Without the need for professional crimping equipment, it is extremely suitable for field equipment installation, later maintenance and old equipment renovation. The solder joint is full and firm with strong tensile and anti-vibration performance, which will not fall off or break due to equipment vibration and cable pulling. The standardized M18 thread structure and complete accessory configuration simplify the assembly process, improve construction efficiency and reduce overall engineering costs.

2.6 Industrial-grade Durability & Global Export Compliance

The connector housing is made of UL94-V0 flame-retardant engineering plastic, with excellent insulation, high temperature resistance and impact resistance. It can work stably in the wide temperature range of -40℃ to +85℃, adapting to extreme cold outdoor environments and high-temperature workshop working conditions. All raw materials comply with EU RoHS and REACH environmental protection standards, meeting global market export requirements. Strict factory sampling tests on conductivity, insulation, waterproof performance and mechanical life ensure ultra-low failure rate and stable batch quality.

With accurate PCB solder tail design, stable 8A current-carrying performance, 0.4U high-precision gold plating and IP67 high-level waterproof sealing, this M18-4P male and female matching aviation socket is widely used in industrial automation, outdoor intelligent monitoring, new energy supporting equipment, engineering machinery and precision instrument industries, covering stable power supply and control signal transmission in various complex environments.

3.1 Industrial Automation Equipment

Widely applied in automated production lines, servo control systems, industrial robot auxiliary modules, assembly line sensors and automatic testing jigs. The precise PCB solder tail length ensures stable welding of internal control boards, and the anti-vibration structure adapts long-term continuous operation of workshop equipment. IP67 waterproof and dustproof performance resists workshop dust and oil mist erosion, ensuring long-term stable operation of automation control circuits.

3.2 Outdoor Monitoring & Field Intelligent Equipment

Suitable for outdoor monitoring boxes, environmental monitoring stations, meteorological detection equipment, field data collectors and roadside intelligent terminals. The double-layer waterproof structure effectively prevents rainwater and dew penetration, and the wide temperature resistance ensures normal operation in extreme weather. The error-proof color assembly design facilitates on-site installation and daily maintenance of outdoor equipment.

3.3 New Energy & Power Distribution Equipment

Used for small energy storage modules, photovoltaic auxiliary equipment, distributed power distribution terminals and low-power new energy signal connection systems. The solid pin and 8A stable current carrying capacity meet the power transmission demand of new energy equipment, and the 0.4U gold-plated contact ensures accurate and stable signal collection and transmission.

3.4 Engineering Machinery & Mobile Vehicles

Applicable to construction machinery, agricultural machinery, vehicle-mounted control modules and mobile engineering electronic accessories. The firm wire-soldering structure and anti-loosening lock nut design effectively resist bump vibration and cable pulling during equipment operation, avoiding signal interruption and power disconnection faults.

3.5 Precision Instruments & Laboratory Equipment

Ideal for precision detection instruments, environmental protection analysis equipment and laboratory testing devices. The low-resistance gold-plated contact ensures lossless signal transmission, and the high-precision welding tail design improves assembly accuracy, meeting the high-stability connection requirements of precision equipment.

We have sorted out professional and targeted FAQ content for this M18-4P aviation socket to help customers quickly understand product parameters, installation specifications and application standards.

Q1: What does PC2.8 and PC3.7 mean?

A1: PC stands for PCB solder tail length, referring to the reserved pin length for PCB through-hole soldering. PC2.8 means male solder tail length is 2.8mm, and PC3.7 means female solder tail length is 3.7mm. It is the welding reserved length, not pin pitch.

Q2: What is the rated current of the pin?

A2: The solid pin is rated 8A per pin. For long-term continuous operation and high-temperature enclosed environment, the recommended safe working current is 6-7A to avoid overheating and aging.

Q3: What accessories are included in the full set?

A3: The complete set includes professional matching accessories: male with hexagonal lock nut + light yellow waterproof gasket; female with standard lock nut + light red waterproof gasket. All accessories are complete for direct installation.

Q4: What are the advantages of 0.4U gold plating?

A4: 0.4U thick gold plating provides excellent anti-oxidation, anti-corrosion and wear resistance. It maintains stable low contact resistance in humid, dusty and vibrating environments, ensuring stable power and signal transmission and extending connector service life.

Q5: What is the waterproof level of this connector?

A5: After correct installation, full mating and complete gasket compression, the protection level reaches IP67, which is suitable for outdoor, damp and dusty industrial working conditions.

Q6: Can this connector be used for both wire soldering and PCB welding?

A6: Yes. The wire-solder structure supports on-site cable soldering, and the standard PC solder tail length supports precise PCB through-hole welding, realizing dual-purpose installation and flexible application.

Q7: Do you support customized services?

A7: We support OEM/ODM customization, including solder tail length adjustment, plating thickness customization, gasket color modification and special thread size production.

We are a professional manufacturer specializing in the R&D, production and sales of industrial circular aviation connectors, waterproof wire-solder sockets and various precision connection terminals. With advanced production equipment, complete testing systems and mature manufacturing technology, we focus on providing global customers with high-stability, high-cost-performance industrial connector solutions.

Our M18-4P male and female matching aviation sockets with 2.8mm/3.7mm PCB solder tail length, solid pin, 0.4U thick gold plating and customized colored waterproof gaskets have stable quality and superior performance, widely recognized in automation, new energy, outdoor monitoring and engineering machinery industries. We support spot wholesale, small batch trial orders and customized processing with fast delivery and strict quality control.

If you need product dimension drawings, 3D files, sample testing, bulk quotation, technical parameter consultation or customized solution docking, please feel free to contact our professional sales team. We will reply to your inquiry within 24 hours and provide professional technical support and one-stop purchasing service.