High Temp Masking Supply Silicone Plug & Cap Set 160-Piece — High-Temp 600°F Reusable Masking for Holes, Threads & Studs

This kit brings a complete range of tapered plugs and flexible end caps so you can protect openings and exposed hardware during high-heat or abrasive finishing operations. With sizes covering diameters from 1/16" to 3/4", and a maximum rated exposure of 600°F (315°C) for short durations, the set is built for professional shops and DIYers who need reliable masking that won’t melt, harden or contaminate parts under normal finishing conditions.

What sizes are included and will they fit my parts?

The set contains 160 pieces split evenly between tapered plugs and flexible end caps. Tapered plugs are designed to seat into a range of hole diameters, while the end caps stretch over studs, bolts and exposed ends.

• 80 tapered plugs — 10 pieces each of 8 common tapered sizes, covering holes from 1/16" to 3/4".
• 80 end caps — 10 pieces each of 8 sizes, fitting studs and post diameters from 3/32" to 3/4".
• Tapered profiles and flexible walls increase compatibility with slightly undersized or oversized openings.

How does the silicone handle high temperatures and coatings?

These parts are molded from high-grade silicone formulated to resist short bursts of elevated heat without melting or flowing. The manufacturer rates the material for exposures up to 600°F (315°C) for approximately 20 minutes, which covers common bake cycles and curing stages used in many finishing processes.

• 600°F/315°C maximum short-term rating (about 20 minutes).
• Low bleed, non-toxic silicone minimizes contamination risk during curing.
• Reusable material that retains flexibility after multiple cycles under normal conditions.

Which finishing jobs are these plugs and caps suitable for?

Use this kit whenever you need to mask holes, threads or protrusions before applying coatings or subjecting parts to abrasive processes. They work across many standard industrial and hobby techniques without requiring chasing or tapping to protect threads.

• Powder coating and oven cure cycles.
• Painting, anodizing, plating, e-coating and hydro dipping.
• Media blasting, sublimation setups and general workshop masking tasks.

How durable and reusable are these silicone caps and plugs?

High Temp Masking Supply uses a resilient silicone that resists hardening, tearing and thermal degradation under normal finishing conditions. With proper handling and storage, pieces can be reused many times, reducing consumable costs for recurring projects.

• Flexible, tear-resistant silicone retains shape after repeated use.
• Non-melting in typical finishing exposures; won’t gum or bleed under normal conditions.
• Store away from solvents and sharp edges to extend service life.

Who is this for: This 160-piece kit is ideal for professional finishers, fabrication shops, automotive restorers, metalworkers and serious hobbyists who need a wide selection of reliable, high-temperature masking plugs and caps. If you regularly mask threaded holes, studs or open ports for powder coating, painting, plating or abrasive operations, the assortment provides ready-to-use sizes that save time and prevent finish defects without modifying parts.