NP135 Napco ceramic bushing 3/8"

The Napco NP135 is a 3/8" ceramic bushing used in electric heat kits, duct heaters, and element rebuilds. It supports and insulates the heating‑element wire as it passes through the metal cabinet, preventing electrical shorts, arcing, and premature element failure.

NOTE: Ceramic insulator bushing for heating elements. Measures 1/2" deep, 3/8" inside diameter and 9/16" outside diameter not including center ridge.

Ceramic bushings commonly crack with age or heat stress; replacing them with OEM Napco/Supco ceramic insulators restores safe operation and proper element alignment.

Primary Functions

• Insulates heating‑element wire

• Prevents shorts against metal frame

• Maintains correct element spacing

• OEM ceramic for high‑temperature applications

Specs

• Inside Diameter: 3/8"

• Style: Non‑tapered ceramic bushing

• Material: High‑temperature ceramic

• OEM Brand: Napco (now Supco)

Cross‑Reference Part Numbers

Direct OEM:

• NP135 — Napco ceramic bushing, 3/8"

• Supco NP135 — Supco‑manufactured continuation

Same family (related but different dimensions):

• NP134 — 3/8" tapered ceramic bushing

• NP138 — 3/8" grooved ceramic bushing (3/4" OD, 3/8" bore)

• NP131 — 7/16" ID ceramic bushing

Functional equivalents (same use‑case class):

• Standard 3/8" ceramic insulators for electric heat kits

• Supco ceramic insulator assortment

Price is for each bushing.