OEM Waterproof Electrical Connector Accessories from Gutai

Why OEM buyers need a defined connector accessory source

OEM waterproof electrical connector accessories are components that seal cable entries on enclosures, junction boxes, inverters, chargers, and control cabinets. The product group includes plastic, nylon, and brass cable glands; PG and metric cable glands; cable gland screw plugs; waterproof connectors; solar MC4 connectors; waterproof junction boxes; watertight corrugated connectors; and flexible pipe connectors.

The procurement risk in OEM supply is not component availability. It is consistency: thread dimensions, seal material, plating quality, certification files, and batch-to-batch tolerance. A component that fails after installation creates rework, downtime, and compliance exposure. For that reason, OEM buyers in electrical and electronics industries evaluate a supplier’s manufacturing capability, customization options, quality-control process, and documentation before scaling orders.

Industry context for waterproof connector accessories

According to Straits Research, the global cable glands market was valued at approximately USD 2.16 billion to 2.25 billion in 2024–2025, with forecasts ranging from USD 3.07 billion to USD 4.96 billion by 2034. Industry intelligence estimates place the global waterproof connector market at about USD 13.4 billion in 2024. Global Market Insights values the solar PV connector market at USD 1.31 billion in 2024, and MC4 connectors account for roughly 68% of that segment. Asia Pacific represents an estimated 38–42% of global cable gland revenue.

On the standards side, IEC 62444 defines construction and performance requirements for cable glands for electrical installations. IP68 remains the benchmark ingress protection rating for waterproof connectors. These conditions explain why OEM buyers increasingly request documented standards compliance rather than a part number alone.

Gutai’s OEM solution for waterproof electrical connector accessories

Gutai’s OEM solution combines manufacturing (mass production), OEM/ODM customization, product development, and export services. The company operates a 5,000 m² facility with 80 employees and an annual output capacity of 10 million units. The R&D team includes 10 engineers. Roughly 80% of output is exported to the Middle East, Southeast Asia, India, Pakistan, the EU, the United Kingdom, and the USA.

Gutai machining workshop for cable gland and connector accessory production.

Product families

Gutai’s main products include waterproof cable glands, EMC cable glands, porous cable glands, brass screw caps, watertight corrugated tubing fittings, solar MC4 connectors, mini waterproof boxes and connectors, and a hose fitting series that includes AD quick connectors, watertight corrugated connectors, and flexible pipe. The range also covers thread conversions and accessory parts.

Cable gland series

The Metric Series cable gland is available in thread sizes M12 to M63, with a cable range of 3–45 mm, thread outside diameter of 12–63 mm, and thread length of 9–21 mm. Material is Nylon PA66 with NBR seal. The PG Series covers PG7 to PG48, cable range 3–45 mm, thread outside diameter 12.5–59.3 mm, and thread length 9–21 mm. Both series serve the new energy sector, industrial automation and advanced manufacturing, construction and infrastructure, and marine engineering and shipbuilding.

Solar MC4 connectors

Gutai’s 1000V MC4 connectors use a metal plug system of Φ2.5 mm, Φ4 mm, or Φ6 mm. Rated voltage is 1000V DC; rated current is 30A for 2.5 mm², 4 mm², and 6 mm² conductors (14 AWG, 12 AWG, 10 AWG), and 45A for 4 mm² and 6 mm² (12 AWG, 10 AWG). Test voltage is 6kV (50 Hz, 1 min). Ambient temperature range is -40°C to +85°C (IEC) or -40°F to +194°F (UL), with an upper temperature limit of +105°C (IEC). Protection class is IP67, unmated touch protection is IP2X, and connector contact resistance is 0.5 mΩ. Terminals use tin-plated or silver-plated copper; insulation housing uses PC/PPO. The locking system is snap-in, flammability rating is UL-94-V0, and corrosion test class is IEC 60068-2-52. Typical applications include photovoltaic energy storage, lithium energy storage, new energy vehicles, AGV and industrial automation equipment, outdoor portable power stations, marine equipment, communication base stations, engineering machinery, and other DC power connection scenarios.

Compliance documents OEM buyers can request

Gutai maintains a quality management system certified to ISO9001:2015 (Registration No. 04324Q31620R0S, issued by Beijing United Intelligence Certification Co., Ltd., valid to 2027-07-01) for the production of cable waterproof joints. The CE Certificate of Compliance (No. TST20241202520-1SC) was issued by Dongguan True Safety Testing Co., Ltd. under EN 62444:2013 for nylon cable gland models in G, MG, PG, and NPT series. The SGS RoHS test report (No. NGBEC26005747401) was issued by SGS-CSTC Standards Technical Services (Ningbo) Co., Ltd. under EU RoHS Directive (EU) 2015/863, covering nylon cable gland. A UL Notice of Completion (File E539858, Volume 1) was issued by UL Solutions under UL 514B for Liquid-Tight Flexible Cord Fittings (USR, CNR series) for the US and Canadian markets.

SGS RoHS test report for Gutai nylon cable gland, No. NGBEC26005747401.

How to run an OEM connector accessory project with Gutai

1. Define the cable entry interface. Identify the thread standard (PG, Metric, NPT, or G-type), thread size, and cable diameter. Gutai’s PG series covers PG7–PG48; Metric series covers M12–M63.
2. Select material and seal. Choose nylon, brass, or stainless steel depending on corrosion, salt fog, UV, and temperature requirements. Seals can be specified by the project.
3. Confirm OEM customization. Options include size and thread specifications, materials, color, packaging, OEM labeling, multi-hole layouts, and specific seal customizations.
4. Request compliance documentation. Confirm which CE, RoHS, UL, or ISO documents are relevant to the destination market before ordering.
5. Approve a sample or trial order. MOQ is from 1 unit, and small trial orders are accepted.
6. Run serial production. Gutai performs 100% full dimension inspection, and the acceptance process can include pre-shipment testing.
7. Ship and use the after-sales process. Delivery terms include FOB and EXW; payment options include T/T, cash, and Alipay. For quality-related problems, returns and refunds without reason are available.

Use cases: PV and EV charging projects

Desert PV power plant in the Middle East

A large Middle Eastern PV energy developer used 20,000 sets of Gutai anti-UV modified PA66 photovoltaic connectors for a 150MW desert power plant over a three-year supply relationship. The housings passed 1,000-hour UV aging tests, and the seals use high-temperature fluororubber to maintain stable sealing under 70°C surface heat and strong wind-sand erosion. Silver-plated terminals keep contact resistance low. The reported result: the connector damage rate dropped from 8% annually for the original imported product to below 1.2%, downtime caused by connection failures was reduced by 70%, and cumulative savings in maintenance and generation losses exceeded USD 80,000.

Coastal EV charging stations in Europe

A coastal open-air EV charging station project in Europe used 5,000 sets of IP68-grade metal waterproof connectors for DC fast charging piles. The connectors use 304 stainless steel and a dual-seal anti-loosening structure, and they passed 1,000-hour salt spray tests and IEC 60068-2-6 vibration tests. The result: the connector-related electrical failure rate fell from 18% annually to 2.6%, annual maintenance cost per station dropped from over 500 RMB to below 80 RMB, and installation efficiency increased by 35%.

OEM supplier capability snapshot

Frequently asked questions

Next step for OEM buyers

OEM buyers at the evaluation or execution stage should verify the four variables that determine field performance: thread interface, sealing material, plating or terminal material, and compliance documentation. Gutai can support these checks with product samples, pre-shipment testing, and a documented quality process.

Finished goods warehouse before export shipment.

Download the latest Gutai catalog: 2025 Gutai catalog PDF.