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Thread-protection caps and plugs have distinctly different purposes.
A threaded cap screws over an exposed threaded component on your application, as shown here. These caps, also known as thread protectors, serve a vital purpose: protect your component’s threads from damage, which can easily occur during mishandling at various stages, from manufacturing to transportation.
They come in different thread sizes to ensure a precise fit. They’re available in metal, but mostly in different plastic materials. Plastic thread protector caps also form an airtight seal to protect against moisture and other damaging elements that can corrode the part.
Where threaded sealing caps protect external threads, threaded hole plugs protect a component’s internal threads. Instead of fitting over the area, they fit into the component, as shown here.
In this example, the threaded plug includes an optional o-ring. Some threaded protection plugs also come with nitrile gasket seals. O-rings and gasket seals provide a watertight grip and prevent the entry of contamination.
Both thread-protection caps and plugs are available in a range of different thread sizes.
Between 75% to 85% of all hydraulic hose failures are caused by contamination, such as dirt, dust and moisture, which in turn cause corrosion.1 Contaminants can enter and circulate within the system at any point – even before the part is installed on machines. An end cap with threads protects components from these threats.
In addition to hydraulics, they’re also used to cap off tube and pipe ends. You’ll find them in automotive, pneumatic and engineering applications, providing protection to welding areas and studs for masking processes and preventing damage caused by mishandling.
The same purpose that caps serve for hydraulic fittings, but protection plugs prevent dust, moisture, and dirt ingress – and the ensuing corrosion – from damaging internal threads.
The highest contamination levels compared to other areas in the hydraulic system are usually found in reservoirs and plumbing. Like threaded screw caps, plastic plugs provide a quick fitting and removal to protect these systems and their threaded components.
And when you want to prevent or limit fluid leakage, a threaded hole plug with a seal or o-ring is ideal due to its precise fit.
Like caps, threaded plugs are used across multiple industries, including automotive, pneumatic and engineering. Applications also include masking processes to protect electrical contact points and internal threads.
If you’re looking for reusable caps and plugs for masking, the material plays an important role. Threaded caps and plugs are typically manufactured in low-density polyethylene (LDPE) and high-density polyethylene (HDPE), just to give a few examples. Unthreaded silicone caps are your best bet for reusability. We suggest you learn more by checking out our Masking materials selection guide .
When choosing your thread-protection caps and plugs, be sure to get the relevant standard of thread that your component calls for. Your choices include:
Thread standard What it means UNF Unified Fine Thread, mostly used in U.S. and Canada. Metric Worldwide standard as per the ISO (International Organization for Standardization). BSP/Gas Used on most UK oxygen, acetylene & propane gas equipment. UJF Thread standard per ASME B1.15. Note, UNJ is not interchangeable with UNF. UNJ has a larger root radius than a standard thread pitch. UJFS UNJ threads are designated by the nomenclature UNJS. NPT National Pipe Thread. U.S. standard for screw threads used on threaded pipes and pipe fittings. JIC Joint Industry Council; fittings that meet the Society of Automotive Engineers (SAE) standard. NF-NS American National Standard; NF means fine thread and NS means special thread,
What plastic threaded caps best suit your needs? Which plastic threaded plug? Types vary and offer different attributes. You’ll find it helpful to check out The ultimate guide to caps and plugs. Below are a variety of thread-protection caps and plugs, along with their thread standard.
BSP/Gas thread
Fewer thread forms and an easy-to-grip head allow for efficient application and removal. Protects against damage and contamination ingress, from production to storage.
UNJ/UNJS thread
Head design enables easy grip and installation. Protects against damage and contamination ingress, from production to storage.
UNF thread
Known as threaded sealing caps. Neoprene sealing disk limits fluid leakage
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UNF threads
Threaded O-ring plugs can be applied or removed by hand, hex wrench or screwdriver. The O-ring provides a watertight seal for superior leak protection.
NPT threads
Square head design enables installation and or removal by hand or wrench. Protects NPT threaded ports against contaminants and moisture.
BSP/Gas thread
Knurled head design for easy grip enables fast assembly or removal by hand. Secure fit provides excellent protection against dirt, moisture and corrosion.
NPT thread
Unique head design allows application or removal by hand or with a 12-point socket head, screwdriver or wrench. Protects NPT threaded ports. Optional o-ring provides a watertight seal to prevent leakage.
NS-NF thread
Apply or remove by hand, hex wrench or screwdriver. Fits NS and NF Class 1-2-3 standard threads. Optional o-ring provides a watertight seal to prevent leakage.
37° JIC flared fittings
Knurled head for easy finger installation. Used to seal light pressure requirements on 37° JIC flared fittings. Functionally Equivalent to Spec: NAS-833, NAS-815 (MIL-C5501/1, MIL-C52078).
UNJ/UNJS thread
Designed with an easy-to-grip head for quick hand installation. Protects threaded components from dust, moisture and damage during production, storage and shipment.
Quick fit – UNF, JIC, & Metric
Fewer thread forms enable quick application.
To see more thread-protection caps and plugs, view the entire range here.
It would benefit you to read our Ultimate guide to caps and plugs. Here, we go in-depth into materials and their properties, and how similar materials differ from each other
Free CADs are available for most solutions, which you can download. You can also request free samples to ensure the solutions you’ve chosen are exactly what you need. If you’re not quite sure which threaded plastic caps and plugs will work best for your application, our experts are always happy to advise you. Whatever your requirements, you can depend on fast dispatch. Request your free samples or download free CADs now.
Questions?
Email us at sales@essentracomponents.com or speak to one of our experts for further information on the ideal solution for your application 800-847-0486.
A thread protector is used to protect the threads of a pipe during transportation and storage. Thread protectors are generally manufactured from plastic or steel and can be applied to the pipe manually or automatically (by machine).
Thread protectors are used frequently in the oil and gas industry to protect pipes during transportation to the oil and gas fields. Metal thread protectors can be cleaned and re-used, while plastic thread protectors are often collected and either re-used or recycled.
Thread Protectors can be used on Casing Pipe, Tubing, Drilling Pipe.
And there are mainly 2 categories: Plastic Thread Protector, Metal Plastic Composite Protector.
Commonly the price for plastic thread protector is lower than that of metal plastic composite protector. Because there is steel material attached on second type.
For Tubing, plastic thread protector is always the choice.
Main Size:
2-3/8, 2-7/8, 3-1/2, 4, 4-1/2, 5, 5-1/2, 6-5/8, 7, 7-5/8, , 8-5/8, 9-5/8, 10-3/4,11-3/4, 13-3/8, 16, 20, NC26, NC38, NC50, 4 1/2 Reg, 3 1/2 Reg, 6 5/8 Reg and 7 5/8 Reg etc.
Threads: BTC, STC, LTC
Contact us to discuss your requirements of China CNC pipe thread lathe QK1319. Our experienced sales team can help you identify the options that best suit your needs.