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Silicone Hollow Tapered Plugs for High-Temp Masking

  • Assorted color-coded silicone hollow tapered plugs for industrial masking
  • Heat resistant 600F silicone plugs in red, blue, and green for size identification
Dimensional diagram for HTP series hollow silicone tapered plug showing top and bottom diameters

Diagram of Dimensions for HTP Hollow Tapered Plugs

Industrial Uses: Powder Coating, Plating, and Anodizing

When it comes to high-temperature masking, precision and efficiency are paramount. Our HTP Series Hollow Silicone Tapered Plugs are engineered to provide a superior seal while remaining a cost-effective alternative to standard solid plugs.

Why Choose Hollow vs. Solid Plugs?

The primary advantages of hollow plugs is enhanced flexibility & lower cost. Unlike solid plugs, which can be more rigid, hollow plugs allow for greater compression. Because they utilize less silicone material, these plugs often provide a 20-30% cost savings over solid versions without sacrificing performance.

Performance in Extreme Environments

Designed for the most demanding finishing processes, our silicone plugs are rated for continuous exposure up to 600°F (315°C). The high-grade silicone is reusable and offers excellent resistance to the harsh chemicals found in plating and cleaning baths.

Key Industrial Applications

  • • Powder Coating: Maintains a clean masking line and up to 600°F / 315°C.
  • • E-Coating & Plating: Provides a durable seal against liquids and electrolytic solutions.
  • • Anodizing: Protects critical threads and bores from aggressive acid baths.

Custom sizes available with low cost tooling. Request free sample or get more information!

Stock items are subject to availability, but are usually available for shipment within 24 hours. Note: Not all large sizes are available for sampling - call for more information.

  • Available Products
    Part # Color A (in.) B (in.) C (in.) D (in.) E (in.) Price Qty/Bag Qty (bags)  
    HTP5-04 LT GREEN 0.906 1.063 1 0.492 0.750 $45.76 100 Add to Shopping List
    HTP6-04 DK GREEN 1.031 1.260 1 0.610 0.750 $57.53 100 Add to Shopping List
    HTP7-04 DK BLUE 1.188 1.438 1 0.688 0.750 $71.91 100 Add to Shopping List
    HTP8-04 LT BLUE 1.313 1.625 1 0.813 0.750 $99.36 100 Add to Shopping List
    HTP9-04 RED 1.469 1.750 1 0.969 0.750 $124.20 100 Add to Shopping List
    HTP10-04 RED 1.653 1.968 1 1.244 0.750 $84.98 50 Add to Shopping List
    HTP10.5-04 CLEAR 1.780 2.090 1 1.125 0.750 $78.44 50 Add to Shopping List
    HTP11-04 DK BLUE 1.890 2.203 1 1.390 0.750 $92.82 50 Add to Shopping List
    HTP11.5-04 DK GREEN 1.969 2.469 1 1.219 0.625 $101.98 50 Add to Shopping List
    HTP12-04 RED 2.125 2.500 1 1.375 0.625 $108.51 50 Add to Shopping List
    HTP13-04 LT BLUE 2.281 2.688 1 1.531 0.625 $124.20 50 Add to Shopping List
    HTP13.5-04 PURPLE 2.438 2.953 1.375 1.688 1 $166.04 50 Add to Shopping List
    HTP13.7-04 LT GREEN 2.677 3.228 1.677 1.0 1 $70.60 10 Add to Shopping List
    HTP14-04 WHITE 3 3.50 1.50 2 1 $61.45 10 Add to Shopping List
    HTP15-04 RUSTY RED 3.25 4 1.50 2.25 1 $94.13 10 Add to Shopping List
    HTP16-04 CLEAR 3.50 5 2 3.071 1.181 $96.75 5 Add to Shopping List

    Custom sizes available with low cost tooling.
    Get a FREE sample of a hollow tapered plug to fit your application - Call Us for a more information.

    Note: Not all large sizes are available for sampling - call for more information.

  • Technical Specifications
    • Temperature Range: up to 600°F / 315°C
    • Ideal for powder coating, e-coating, plating, and anodizing.
    • Material: Silicone
    • Color: Various
    • Re-usable.
    • More flexible than solid plugs for easier insertion.

    Hollow Tapered Plug

    hollow tapered plug diagram

    Diagram of Dimensions for Hollow Tapered Plugs

     

    Custom sizes available with low cost tooling.
    Get a FREE sample of a hollow tapered plug to fit your application - Call Us for a more information.

    Note: Not all large sizes are available for sampling - call for more information.

  • Masking 101 Helpful Hints

    Silicone Hollow Tapered Plugs (HTP's) use less silicone material than standard, solid plugs. Because a portion of the plug is hollow, it allows for further insertion of the plug into a part, often creating a tighter seal. In many cases, the reduced material in the plug brings the price of these parts down.

    • Ideal for use in powder coating, e-coating, plating, and anodizing.
    • They offer excellent high temperature and good chemical resistance.
    • Use in temperatures up to 600°F / 315°C.
    • More flexible than solid plugs for easier insertion.

     

    Custom sizes available with low cost tooling. Contact Us today for a quote.

    Frequently Asked Questions

    • How do I choose the right size hollow tapered plug? To select the correct Hollow Tapered Plug, you must match the plug dimensions to the diameter of the hole you are masking.
      1. The "A" Dimension (Bottom): Should be slightly smaller than the hole diameter to allow for easy insertion.
      2. The "B" Dimension (Top): Should be significantly larger than the hole diameter to ensure the plug doesn't fall through and creates a secondary seal.
      Goal: Aim for the hole diameter to fall right in the middle of the "A" and "B" range for the most secure fit.

    • What is the difference between sizing hollow vs. solid silicone plugs? Hollow plugs offer enhanced flexibility and greater compression compared to solid versions. While a solid plug requires a precise fit, the hollow core of the HTP Series allows the walls to collapse slightly. This makes them ideal for:
      - Irregular or "out-of-round" holes.
      - Applications where a slightly oversized plug is needed for a tighter seal without requiring excessive force to insert.
      - Situations where cost is a factor, as hollow plugs typically provide a 20-30% cost savings.

    • How deep should the plug sit in the hole? For the best results in powder coating or plating, the plug should be inserted roughly 1/2 to 2/3 of its total length (Dimension C). If the plug is only barely gripping the hole, it may become dislodged during high-pressure washes or air-drying cycles.

    • Can these plugs be used for threaded holes? Yes, hollow tapered plugs are excellent for masking threaded holes. The flexible walls "bite" into the threads, providing a superior liquid-tight seal for anodizing and plating.

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