Inch O-Ring Plugs

These inch O-ring plugs are used as compact sealing elements inside injection mold tooling when a threaded plug must be installed behind an insert, holder block, or mold plate. The sealed interface helps prevent leakage in internal cooling circuits and supports stable thermal performance during production runs.

• Automotive connector housing molds: In tight mold interiors, the reduced footprint compared with NPT-style pipe plugs helps minimize interference with adjacent cooling channels, ejector hardware, or location features. The Buna O-ring supports consistent sealing up to 210°C.
• Consumer electronics and appliance molds: When plugs are backed up by insert blocks or plates, the O-ring style provides reliable shutoff without requiring additional sealing compounds, improving repeatability during maintenance.
• Medical device component molds: For fine-feature molds where dimensional control and assembly access matter, the compact design supports tighter layouts while maintaining sealing integrity to 210°C.

This product uses an elastomer Buna (NBR) O-ring as the sealing element. Buna is selected for stable sealing behavior across elevated mold temperatures, with the stated capability up to 210°C, which helps maintain integrity in hot mold cycles.

• Key property for tooling: Good sealing stability under thermal cycling, reducing the risk of coolant leakage at the plug interface.
• Heat treatment: No steel heat-treatment process is specified in the provided data because the critical functional material called out here is the Buna O-ring.
• Design trade-off: Compared with metal-to-metal sealing approaches (e.g., certain rigid plug geometries), the O-ring provides compliance to accommodate minor surface irregularities and assembly variation.

If you need details on the plug body steel grade, hardness (HRC), or heat treatment state, please share the drawing/part number for this exact series configuration so we can align specifications.

Selection is driven by matching the plug’s removal thread size and ream size to the threaded and counterbore/interfacing dimensions in your mold insert or holder block. Use the provided series options to ensure compatibility with your cooling-circuit plug ports.

• Removal thread size (in): Choose from 6-32, 10-32, or 1/4-20 based on the thread form machined in the mold plate/insert.
• Ream size (in): Select the corresponding reamed opening diameter from 0.281, 0.375, 0.500, 0.625, or 0.750.

To avoid assembly interference in compact cooling layouts, confirm that your cavity/core clearances leave room for the plug footprint after installing any backing insert or plate. Consider tolerance stack-up between the reamed size and the mating counterbore/seat, since the O-ring seal relies on correct fit and compression at the interface.

Only the thread size and ream size are configurable per the listed ranges; other fit aspects should be verified against your mold port drawing for best sealing repeatability.