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Caps & Plugs – A quick Buyer's Guide

clock 7 minutes | 12 Feb 2020

Caps & Plugs - A Quick Buyer's Guide

Cap & Plug Solutions

Whether you need to protect your products from damage and contamination or mask holes in the painting process, caps and plugs are essential to ensuring your parts remain safe and functional.

When it comes to caps and plugs, application process and material choice are key. For example, if an application needs a solution that provides thread protection, round vinyl end caps are a great choice. Vinyl will not tear, split or shred when applied or removed. If you need to protect the thread on studs for your automotive or engineering application, flange protection caps work well. For protection against damage, dirt, moisture and corrosion during shipping or storage, try our standard tapered caps & plugs, which work great.

This guide is designed to give buyers an introduction. For expert advice, we’re always happy to help. We can also help with free samples and CADs. You’ll like our flexibility too. Small orders are no problem. And whatever you need, you can depend on fast dispatch.

Getting started: choosing the right cap or plug

What do you want from your cap or plug? The answers to these questions can start you in the right direction.

I need to save time

Fit multiple profiles with fast hand applications

Tapered Round Plugs with Flange

Protects against contamination during transportation and storage

Tapered Round Plugs with Flange

I have to think about heat

Choose PVC or silicone for your material

USB Dust Cover

Protects unused connector ports on electrical components

USB Dust Cover

I use tool-based processes

Go for a cross head or custom cap or plug

Slottex Plugs

Can be applied or removed with screwdriver, spanner or socket. They can be tightened manually or with power tool

Slottex Plugs

I need to protect against liquids or contain liquids

Opt for an O-ring

Threaded O-ring Plug

Especially popular for hydraulic-fitting applications

Threaded O-ring Plugs

I’m protecting an NPT threaded hole

Select a threaded plug

Threaded Protection Plugs for NPT Threads

Protects from contamination and moisture during production and shipment

Threaded Protection Plugs for NPT Threads

I need fast removal

Use caps and plugs with pull tabs or flanges

Side Pull Plugs

Side pull tab for quick removal

Side Pull Plugs

Now let’s look at some examples of caps and plugs.

Push fit caps & plugs

Maintain quality and ensure smooth assembly and transit by protecting critical internal and external profiles from damage.

FEATURES: Many styles available including Tapered, Easy Removal, Quick-Fit, Flexible and Pull-Tab

MATERIAL: Material options include LDPE, Vinyl (PVC), TPR, TPE, and EVA suitable for different applications

SPECIFICATION: A diverse range of dimensions helping to protect non-threaded or threaded applications

Tapered Cap and Tapered Plug

Tapered Cap and Tapered Plug

  • Plugs multiple inner diameters
  • Caps multiple outside diameters
  • Tapered caps and plugs made of Low Density Polyethylene (LDPE), a rigid, yet soft material
Pull Tab Caps

Pull Tab Caps

  • Large pull tab for easy removal
  • Available in PVC for flexibility and airtight seal
  • Available in Ethylene Vinyl Acetate (EVA) for tensile strength, toughness and flexibility
Uniplugs

Uniplugs

  • Set of blades lock tight when pushed into a threaded hole and twisted
  • Each plug covers a range of different thread sizes and styles
  • Easy removal by simply unscrewing the plug from the thread
Flexible End Cap - Acid Resistance

Flexible End Cap - Acid Resistance

  • Available in TPE and TPR
  • Flexible material can stretch onto larger diameters for a snug fit
  • Good resistance to acids
  • Hanging tab to work with round wire hooks and other support wire hooks
Ezeplugs

Ezeplugs

  • Patented Quick Fit design easily locks the plug into place with a simple push
  • Strong and flexible pull-tab for quick removal
  • Seven sizes in two styles protect more than 25 popular thread sizes
  • Made of Low Density Polyethylene (LDPE), a rigid, yet soft material

Masking caps, plugs and tapes

Help increase customer satisfaction with a professional finish by masking and protecting important areas with easy-to-fit caps and plugs.

FEATURES: Choose from , Flangeless, Pull Plugs, Flexible, Stretch Fit and Easy-Pull Caps

MATERIAL: Material options include TPR, EPDM, Vinyl (PVC), Silicone, Polyimide Tape and Fibreglass Cloth Tape

SPECIFICATION: What is your applications maximum temperature requirements? Our solutions perform in temperatures up to 600°F (315°C)

Check out the material guide here

High-Temperature Silicone Tapered Plugs

High-Temperature Silicone Tapered Plugs

  • Available as a solid plug or with a hollow core to aid in compression and reduce cost due to less material used
  • Excellent chemical resistance
  • Reusable
  • Also available in EPDM
Masking Flangeless Plugs

Masking Flangeless Plugs

  • Masks holes without masking surrounding areas
  • Protects multiple diameters
  • Masking pull plug with tab for easy installation and removal
  • Available in TPR and EPDM
Masking Pull Plugs

Masking Pull Plugs

  • Masks threaded or non-threaded through holes
  • Fast, easy removal
  • Available in silicone and EPDM
Flexible End Cap

Flexible End Cap

  • Suitable for a multitude of applications
  • Flexible to ensure a tight fitting
  • High-temperature PVC
Masking tape – Polyimide

Masking tape – Polyimide

  • Highly conformable
  • Excellent heat and solvent resistance
Masking tape – Fibreglass Cloth

Masking tape – Fibreglass Cloth

  • Easy to remove without fraying
  • Excellent for masking irregular shapes and corners

Threaded caps & plugs

In applications where precision is everything, you can protect your vital threads from contamination and damage during manufacture and shipping.

FEATURES: Choose from Threaded Sealing, Protection Caps, Snap-Fit and O-Ring Plugs

MATERIAL: Common choices include HDPE, LDPE, polypropylene (PP) and nylon. LDPE gives a degree of flexibility, while PP resists chemicals. HDPE and nylon are desirable for their durability

ADAPTABILITY: Depending on the application process or cap and plug styles, there are options for hand or tool operated solutions

SPECIFICATION: Available in UNF, Metric, SAE, NPT, JIC and BSP thread styles

Threaded O-ring Plug - Metric Threads

Threaded O-ring Plug - Metric Threads

  • Can be applied or removed by hand, hex wrench or screwdriver
  • Compressing flange lip and O-Ring provide water-tight seal for superior leakage protection
  • Available in a variety of threads
  • Available in HDPE
Threaded Protection Caps

Threaded Protection Caps

  • Protects threaded components from dust, moisture and damage during production, storage and shipment
  • Designed with an easy-to-grip head for ease of hand installation
Threaded Sealing Caps - Metric Threads

Threaded Sealing Caps - Metric Threads

  • Protects and limits fluid leakage
  • HDPE material resistant to solvents and reduces potential shearing
  • Hexagonal head can be tightened by a wrench or socket at low torque, but hand tightening recommended
Snap Fit Plugs

Snap Fit Plugs

  • Center tab allows for a strong grip for easy tightening and removal
  • Suitable as a metric threaded cap, and for BSP and UNF threads
  • Made of Low Density Polyethylene (LDPE) to protect from damage

Pipe and flange protection caps and plugs

Transportation and handling can damage and contaminate pipes. Eliminate the risks you face with quality protection, giving you the reassurance you need to get on with the job.

FEATURES: Protects threaded or non-threaded pipe ends from damage or contamination

MATERIAL: Polyethylene, including low density polyethylene (LDPE), is a low cost but durable material that allows easy assembly and removal

SPECIFICATION: Standard sizes will protect ANSI, API and DIN pipe ends

Ribbed Pipe-End Plugs

Ribbed Pipe-End Plugs

  • Secure friction fit with mating pipe’s I.D.
  • Excellent protection against contaminants
  • Made of Low Density Polyethylene (LDPE), a rigid, yet soft material
Standard Size Pipe End Cap

Standard Size Pipe End Cap

  • Made of flexible, yet rigid, LDPE
  • Internal ribs ensure tight fit and release after pressure build up
  • Also available with Vent Hole
Push-In Full Face Flange Protectors

Push-In Full Face Flange Protectors

  • Flexible fins for snug fit
  • Fasteners not required
  • DN 10-300, ANSI ½in – 12in
Adhesive Full Face Flange Protectors

Adhesive Full Face Flange Protectors

  • Tight bond
  • Peel and stick design
  • Leaves no residue

Hydraulics caps and plugs

Protecting your hydraulic fittings can require specialist caps and plugs. Mitigate fitting damage and maintain thread protection with our wide range of hydraulic solutions.

SPECIFICATION: Many styles available such as Side Pull Plugs, Easy Removal Hexagonal Caps, Threaded and Quick Release Plugs

MATERIAL: LDPE and TPE are two examples of materials used in hydraulics protection. Both are strong and durable, yet provide a degree of flexibility. HDPE and nylon are also used for their strength, while polypropylene is especially good at resisting chemicals

ADAPTABILITY: No matter the protection level needed, you can choose from push-In styles for light protection against dust, or threaded sealing solutions for a more robust sealing protection

Hexagonal Caps

Hexagonal Caps

  • Rigid design allows easy application and removal
  • Available in all common hydraulic coupling sizes
  • Also suitable for protecting round components
Quick Release Plugs

Quick Release Plugs

  • Designed to remain attached to hose
  • Made of TPE for excellent flexural fatigue resistance and high-impact strength
Threaded Protection Plugs

Threaded Protection Plugs

  • Knurled head for an ergonomic grip
  • Excellent protection from dirt, moisture and corrosion

Download free CADs and try before you buy

Free CADs are available for most solutions, which you can download for free. 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 product will work best for your application, our experts are always happy to advise you.

Request your free samples or download free CADs now.

Caps and Plugs Buyer's Guide PDF Download
Caps & Plugs - The Design Engineer's Guide