High Temp Silicone T-Plugs (Washer Plugs) – For Grounding & Masking
Leader Masking Silicone T-Plugs feature a solid body with a wide flange (washer) on top. This dual-action design masks the hole while simultaneously creating a circular clean area around the opening for electrical grounding (earthing).
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Design: T-Shape with Integrated Flange
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Function: Masks hole + Creates grounding ring
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Temp: Up to 315°C (600°F)
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Feature: Cannot be pushed all the way through
Description
Product Overview
Leader Masking Silicone T-Plugs (also known as Flanged Plugs or Washer Plugs) are the professional’s choice when you need to mask a hole AND the immediate surface area surrounding it.
Unlike standard tapered plugs that fit flush or inside the hole, T-Plugs sit on top. The “T” shaped flange acts as a built-in washer. This is critical for parts that require Electrical Grounding (Earthing) after powder coating, as it leaves a clean, paint-free ring for contact.
Key Features & Benefits
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⚡ Grounding / Earthing Masking: The flange creates a clean metal ring around the hole, ensuring perfect electrical conductivity for grounding points without scraping off paint later.
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🛑 Insertion Control: The flange acts as a stop, preventing the plug from being pushed too far into the hole or falling through into the cavity.
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🔥 Extreme Heat Resistance: Made from high-grade virgin silicone, withstanding 315°C (600°F) curing ovens without melting.
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👋 Easy Removal: The flange provides a natural handle. Operators can easily grip and pull the plug out, even while wearing heavy gloves.
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♻️ Reusable: Silicone sheds cured powder coating easily, allowing for multiple uses.
Technical Specifications
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Material: 100% Virgin Silicone Rubber
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Hardness: 55 Shore A (Standard)
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Temp Range: -40°F to 600°F (-40°C to 315°C)
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Chemical Resistance: Excellent (Acids, Alkalis)
Standard Size Chart
| Size | A | B | C | D |
| LM-1 | 1.8 | 4 | 2 | 1 |
| LM-2 | 1.8 | 4 | 1.2 | 1.8 |
| LM-3 | 2 | 4 | 2.7 | 2.3 |
| LM-4 | 3 | 6 | 3 | 2.5 |
| LM-5 | 3.1 | 5 | 3.5 | 1.2 |
| LM-6 | 3.25-3.6 | 5.3 | 3.5 | 3 |
| LM-7 | 4.3 | 5 | 4.5 | 1.2 |
| LM-8 | 4.3 | 8.1 | 6.9 | 3.5 |
| LM-9 | 4.3 | 5.1 | 4.5 | 1.1 |
| LM-10 | 5.1 | 4.5 | 5.8 | 0 |
| LM-11 | 5.2 | 8 | 2.5 | 1.5 |
| LM-12 | 5.2 | 7 | 4 | 2 |
| LM-13 | 5.8 | 8 | 4 | 2 |
| LM-14 | 6.3 | 10 | 6 | 2.5 |
| LM-15 | 6.3 | 7 | 4 | 3.2 |
| LM-16 | 6 | 10 | 3.5 | 3.2 |
| LM-17 | 6.5 | 10 | 3.5 | 2.2 |
| LM-18 | 7 | 10 | 7 | 3 |
| LM-19 | 7.2 | 11.5 | 5 | 2.5 |
| LM-20 | 7.5 | 10 | 6.5 | 2 |
| LM-21 | 7.6 | 10.3 | 4.3 | 2.5 |
| LM-22 | 7.9 | 11 | 9 | 1.5 |
| LM-23 | 8 | 11 | 3 | 3 |
| LM-24 | 8.3 | 11 | 9 | 3 |
| LM-25 | 8.3 | 11 | 9 | 2 |
| LM-26 | 8.5 | 11 | 4.5 | 2 |
| LM-27 | 8.7 | 11 | 5 | 2.5 |
| LM-28 | 9.2 | 12 | 7 | 3 |
| LM-29 | 9.6 | 13 | 9 | 2.5 |
| LM-30 | 10.3 | 15 | 6.5 | 3 |
| LM-31 | 10.3 | 15 | 6.5 | 3 |
| LM-32 | 11.5 | 15 | 6.5 | 3 |
| LM-33 | 12 | 13 | 3 | 2 |
| LM-34 | 12.3 | 15 | 6.5 | 3 |
| LM-35 | 17.5 | 20 | 8.3 | 2 |
| LM-36 | 36 | 42 | 7 | 5.3 |
How to Choose the Right T-Plug?
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Match the Insert (D1): The Insert Diameter (D1) should be slightly smaller (about 0.2-0.5mm) than your hole diameter for a push fit, or slightly larger if the plug is flexible, depending on the tightness required.
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Check the Flange (D2): Ensure the Flange Diameter (D2) is large enough to cover the area you want to keep paint-free (grounding area).
Industry Applications
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Powder Coating: Masking grounding points on chassis, enclosures, and cabinets.
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E-Coating: Sealing holes with a defined clean edge.
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Plating: Preventing plating build-up on the first surface.
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