STP101 Tapered Silicone Plug – 3/16" Powder Coat Masking Plug

The STP101 is a high-temperature tapered silicone masking plug for 3/16"-diameter holes. It is used to prevent powder, liquid paint, and e-coat from entering bores and threaded holes during the finishing process, protecting precision surfaces from coating contamination.

The STP101 is designed for holes with a nominal diameter of approximately 3/16" (0.1875"). Its taper accommodates slight bore-size variation, allowing a snug friction seal in holes near that dimension. Confirm the fit with a sample plug before production-line implementation.

The STP101 is rated for continuous exposure to high-temperature powder coating cure ovens, typically up to 500°F (260°C). It does not melt, deform, or fuse to the bore wall during cure, allowing easy post-process removal.

Insert the STP101 small-end first into each 3/16" hole before loading parts into the powder booth. The tapered body seats into the bore and creates a friction seal, blocking all coating entry. After the oven cure, the plug slides out cleanly, leaving the bore surface clean, dimensionally accurate, and ready for assembly.

Automotive OEM and Tier 1 suppliers, agricultural and construction equipment manufacturers, HVAC fabricators, and contract powder coating operations all use the STP101 to protect 3/16" bores in frames, brackets, housings, and structural components.

The STP101XL is a longer version of the STP101, providing a deeper insertion depth for thicker parts or extended bore lengths where a standard-length plug may not achieve sufficient engagement. Both fit 3/16" holes but offer different grip lengths for different wall thickness requirements.

STP101 tapered silicone plugs can be ordered at creativecoatingsolutions.com/stp-101. Multi-pack and volume pricing are available. Contact Creative Coating Solutions for bulk order quotes or to discuss a masking kit that combines multiple STP sizes for your production line.