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This section provides an overview for connector caps as well as their applications and principles. Also, please take a look at the list of 11 connector cap manufacturers and their company rankings. Here are the top-ranked connector cap companies as of May, 2025: 1.Polymer Molding, Inc..
Table of Contents
A connector cap is an accessory that protects the female (receptacle) end of a connector to prevent foreign objects from entering and damaging the connector.
They come in a variety of shapes and sizes, and contribute to data security and virus prevention. A connector cover, on the other hand, is used to protect the male part of a connector (the plug of a cable).
Both are utilized to protect different parts of the connector. It is important to note that they are used for different purposes and target different connector parts. Understanding these differences and selecting the appropriate protective accessory will extend the life of the connector and improve safety.
The primary uses of connector caps are to prevent incorrect insertion, protect connector terminals, and provide security. In addition, they are used for the following purposes:
Caps for connecting parts protect the mating part of connectors, and caps for connecting parts protect the part where wires are connected. These caps are placed on unused connectors to prevent dust and foreign matter from entering the coupling area. They also serve to prevent accidental contact with energized parts.
Connector caps are a simple way to reduce the risk of accidental insertion of USB memory sticks and other devices.
Used for the purpose of preventing data leakage and virus infection.
Connector caps may be used not only to protect connectors but also as accessories for smartphones, tablets, laptops, etc. They can be connected to the USB type or audio jack type compatible with each device to express individuality and taste. They are also often appreciated as gifts and presents.
There are two types of connector caps: one for the connection and the other for the wiring. There are also various types depending on the device and interface. The following are some examples:
Connector caps are generally shaped to be inserted into connectors. Recently, however, a sliding type cover that is integrated with the device has been proposed.
This cover is integrated into the device itself and can be easily opened and closed as needed while protecting the connector's terminal area. By utilizing the sliding function, the cover is out of the way, facilitating the use of the connector.
In addition, because the cover is integrated into the device itself, there is no need to worry about removing or losing it, providing adequate protection at all times. Such connector covers are very useful for improving the durability and reliability of electronic equipment. The patent highlights their applicability to a wide variety of electronic devices and is expected to find a broad market.
Connector caps are used to protect the female connectors of devices. Connector covers, on the other hand, are used to protect the plug portion (male connector) of a cable.
However, since they are often referred to interchangeably, it is important to note which component is being addressed in context, in written and spoken language.
*Including some distributors, etc.
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Polymer Molding, Inc. is a manufacturer of plastics products, plastic protective caps, plugs and custom moldings. The company is located at Pennsylvania, USA and founded in 1978. The company offers plugs, caps, high-temp masking, vinyl, cable ties, netting, and tubing inserts. These types of products are usually disposable and are commonly used to protect threaded fittings, tubing, and valves and in many other applications where contamination or shipping damage needs to be avoided. In 1989, the company introduced its proprietary line of protective products and has grown to one of the great producers of these types of commodities.
LOKRING Technology is headquartered in Willoughby, Ohio as an ISO 9001:2015-certified manufacturer of offload and gas connection components. The company serves numerous industries including medical devices, railroads, pipelines, and marine industries across the globe. The company’s products include adapters, caps, couplings, elbows, unions, and other connectors according to the needs of each market. The company utilizes an external distribution network for customers while also providing design guides, installation services, and installation tools.
Viega has a history of over 120 years and is based in Broomfield, Colorado. Viega is a developer and producer of hardware and industrial tools and pipe fitting technology. Viega’s equipment specializes in materials such as copper, stainless, polymer, lead bronze, and cupronickel. Some of Viega’s product listings include elbows, tees, adapters, flanges, caps, unions, couplings, reducers, branch connectors, tubing, manifolds, stub-outs, closet adapters, outlet boxes, press sleeves, closet risers, ballcock nuts, fasteners, sealing elements and gaskets.
StockCap was founded in 1950 and is headquartered in Arnold, Missouri as a division of Sinclair & Rush, Inc. The company is an ISO 9001:2015 certified custom designer and manufacturer of parts for the automotive, finishing, and HVAC markets. The company produces several types of products including caps, plugs, tapes, and others, using materials such as vinyl, rubber, and plastic. The company’s custom capabilities include plastic injection molding, vinyl dip and rubber molding, extrusions, thermoforming, and finishing operations.
Monroe Aerospace (ECAS) is headquartered in Melbourne, Florida with a history dating back to the 1920s. Monroe Aerospace is an ISO 9001:2015 and AS9100D certified industrial manufacturing company. Monroe Aerospace serves many vertical markets including aerospace/defense automotive, medical, and transportation. Monroe Aerospace’s product offerings include bolts, screws, cherry rivets, clamps, clevis pins, clients, DZUS products, electrical components, collars, hinges, Huck bolts, Jo bolts, lock washers, nut plates, rivets, quarter turn fasteners, sheet metal screws, and washers.
Jetronics India is a manufacturer and exporter of MS connectors and MIL C 5015 grade electrical connectors. Guided by Mr. Anil Bangia, their partnership firm has delivered quality products for over two decades. From corrosion resistance to high current capacity, their connectors serve industries like the Military, Aerospace, and Telecommunication. Crafted from lightweight aluminum alloy, their connectors are corrosion-proof and resilient. With a range spanning lighting to transportation, Jetronics India caters to diverse applications across global markets.
ABB Electrification Canada is a subsidiary of industrial giant, ABB. ABB Electrification serves the data center solutions, oil, gas & chemicals, food & beverage, railway, infrastructure, and microgrids industries with solutions such as smart industry, E-mobility, smart living, smart power, smart cities, and smart distribution. Products include control systems, power electronics, UPS and power conditioning, industrial software, PLPC automation, robotics, power converters and inverters, medium voltage products, metallurgy products, control room solutions, and motors and generators.
The National Die Co., founded in 1945, is a manufacturer and supplier of deep-draw metal stampings and parts such as cans and caps, enclosures, fasteners, nozzles and pins, tubes and cups, and exotic metals. The products are used in the fields of communications, power tools, automotive, fuel supply, and fire protection. The Wolcott, Connecticut-based company is ISO 9001:2015 certified and offers finishing and forming operations such as beading, dimpling, embossing, multi-side piercing, and set drawing.
Latrobe Foundry Machine & Supply Co. (LFMS) is an American manufacturer of aluminum pipe fittings established in 1933 and based in Whitney, Pennsylvania. The company produces various aluminum pipe fittings including butt weld, flanged, and threaded models, as well as flanges, socket weld couplings, and nipples. They also offer custom casting and 3D printing services, as well as in-house machining for client projects. LFMS products are primarily used by clients in construction and agriculture, as well as by companies in the marine and chemical industries.
Essentra Components is a producer of plastic injection moulded, vinyl dip moulded, and metal components, operating in 29 countries across 4 continents. Essentra Component has a catalog of over 45,000 products. These range from caps, plugs, wire & cable management, flange protection, knobs, handles & grips, access hardware, PCB, and electronics hardware. Essentra Component offers free samples of CADs of standard parts for assist customers in creating custom-manufacture red solutions, including prototyping and 3D printing.
Ranking as of May 2025
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | Polymer Molding, Inc. |
100.0%
|
Derivation Method
The ranking is calculated based on the click share within the connector cap page as of May 2025. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.Number of Employees
Newly Established Company
Company with a History
*Including some distributors, etc.
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
|
United States of America
|
5 | 62.5% |
|
India
|
1 | 12.5% |
|
Japan
|
1 | 12.5% |
|
United Kingdom
|
1 | 12.5% |
73 products found
73 products
Alp Systems Co., Ltd.
160+ people viewing
Last viewed: 16 hours ago
■Caps and other parts for each connector ・Cap for adapter ・Connector cap ・Cap for ferrule ・Falling prevention cap ・Stackable cap
Oriental Motor Co., Ltd.
150+ people viewing
Last viewed: 1 day ago
A cover to protect the motor cable connector joint. ■Features -Easy to install by simply placing it over the connector connection part ・With lock...
Tocone
530+ people viewing
Last viewed: 1 day ago
The 7/16 DIN connector is a series with excellent robustness and waterproofness. It is often used for overseas radio and antennas at mobile communi...
2 models listed
Tocone
410+ people viewing
Last viewed: 1 day ago
The 4.3/10 connector is a series with excellent robustness and waterproofness. It is often used for overseas wireless and antennas at mobile commun...
2 models listed
Tocone
540+ people viewing
Last viewed: 5 hours ago
The BNC (Bayonet Neill Concelman) connector has a relatively good frequency characteristics (DC -2 GHz), so it is widely used in video devices, com...
2 models listed
Tocone
470+ people viewing
Last viewed: 1 day ago
The SMA (Sub Miniature Type A) connector is one of the high -performance and small connectors for microwaves, has a wide range of frequency and dur...
2 models listed
Tocone
480+ people viewing
Last viewed: 3 hours ago
The N (Type-Navy) connector has a good frequency characteristics (DC-12GHz), and is mainly used in a wide wireless communication device in the UHF ...
3 models listed
Tocone
210+ people viewing
Last viewed: 1 day ago
The F -type connector is mainly used for TV antennas and satellite broadcasting, mainly terrestrial digital broadcasting. There is also a type that...
Takachi Electric Industry Co., Ltd.
200+ people viewing
Last viewed: 18 hours ago
A dustproof cover for the optical fiber connector socket. We have sizes to suit three types of connector slots: SFP, QSFP, and CXP. It has a handle...
Takachi Electric Industry Co., Ltd.
170+ people viewing
Last viewed: 5 hours ago
A dustproof cover that protects the USB socket (USB female connector). It can be easily inserted by simply plugging it in. If you need to remove it...
Takachi Electric Industry Co., Ltd.
150+ people viewing
Last viewed: 1 day ago
This is a USB type A cover that is installed by drilling a hole in the housing. The insertion pin has a hinge structure, so even if the cover is re...
Kita Nippon Electric Wire Co., Ltd.
140+ people viewing
Last viewed: 16 hours ago
■Applications/Features ・Used to insulate the connections between wires on high-voltage or low-voltage overhead distribution lines. ・It can be eas...
Rin Connect Co., Ltd.
540+ people viewing
Last viewed: 1 hour ago
Steadytec ® connector (data, energy, sensor communication) Pioneer of technology development. We have reliable, user -oriented and easy -to -use p...
10 models listed
Rin Connect Co., Ltd.
570+ people viewing
Last viewed: 1 day ago
Steadytec ® connector (data, energy, sensor communication) Pioneer of technology development. We have reliable, user -oriented and easy -to -use p...
5 models listed
Shinagawa Shoko Co., Ltd.
140+ people viewing
Last viewed: 1 day ago
■Features A ferrule protection cap for optical fiber connectors. Due to its elastic shape, it can be used with various types of connectors. There i...
Alp Systems Co., Ltd.
120+ people viewing
Last viewed: 1 day ago
Caps and other parts for each connector. ■Optical connector parts types ・Cap for adapter ・Cap for connector ・Cap for ferrule ・Falling preventi...
Candox Systems Co., Ltd.
130+ people viewing
Last viewed: 8 hours ago
■Summary ・We always stock protective caps for SMA and N connectors. ・Sales unit: 100 pieces.
Rin Connect Co., Ltd.
590+ people viewing
Last viewed: 1 day ago
Steadytec ® connector (data, energy, sensor communication) Pioneer of technology development. We have reliable, user -oriented and easy -to -use p...
9 models listed
Nippon Dick Co., Ltd.
310+ people viewing
Last viewed: 21 hours ago
■Features Attach waterproof caps to unused input/output connectors. The protective structure will no longer be maintained.
2 models listed
Magnetic Research Institute Co., Ltd.
80+ people viewing
Last viewed: 18 hours ago
■Features A physical cybersecurity device that prevents unauthorized device access by physically blocking unused RJ11 ports. Contains 10 RJ11 port ...
Magnetic Research Institute Co., Ltd.
80+ people viewing
■SMARTKEEPER ESSENTIAL Physical security products This product is a physical cybersecurity device that prevents unauthorized connections to unused ...
Magnetic Research Institute Co., Ltd.
70+ people viewing
■SMARTKEEPER ESSENTIAL Physical security products This product is a physical cybersecurity device that prevents unauthorized removal of LAN cables ...
Magnetic Research Institute Co., Ltd.
70+ people viewing
■SMARTKEEPER ESSENTIAL Physical security products This product is a physical cybersecurity device that prevents unauthorized connections to unused ...
Magnetic Research Institute Co., Ltd.
70+ people viewing
■Features This product is a port cover that prevents dirt and dust from entering unused network ports (Hub and LAN ports on the back of your comput...
FURUKAWA ELECTRIC POWER SYSTEMS CO., LTD
80+ people viewing
Last viewed: 10 minutes ago
■Applications Insulation protection of clamping connectors on overhead distribution lines
Mitsubishi Electric Engineering Co., Ltd.
50+ people viewing
Last viewed: 1 day ago
■Product overview We offer a variety of cables, branch units, etc. for connecting to CC-Link. ■Features 1. This is a dustproof cap for an unused c...
Mitsubishi Electric Engineering Co., Ltd.
50+ people viewing
Last viewed: 14 hours ago
■Product overview We offer a variety of cables, branch units, etc. for connecting to CC-Link. ■Features 1. This is a dustproof cap for an unused c...
Mitsubishi Electric Engineering Co., Ltd.
50+ people viewing
Last viewed: 1 day ago
■Product overview We offer a variety of cables, branch units, etc. for connecting to CC-Link. ■Features 1. This is a dustproof cap for an unused c...
NITTO KOHKI CO.,LTD.
40+ people viewing
Cap for installing a stopper at the end of a pipe
