Alcor 86253 CHT BAYONET STYLE TYPE K, SCREW-IN (PREVIOUSLY 862

The **Alcor CHT Bayonet Style Screw-in Probe** (P/N **86253**) is a **Type K thermocouple** designed for **cylinder head temperature (CHT)** measurement on reciprocating-powered aircraft. The probe features a **small element diameter** that provides near-instantaneous instrument response and generates sufficient electrical power for **Alcor unamplified instruments**. It is intended for use with **Type K CHT instruments and leads**. This **bayonet-style screw-in probe** is **not stand-alone FAA approved**. Please contact Alcor for **FAA-approved installations**. If using bulk wire for installation, Hardware Kit P/N 38091 must be purchased separately. The kit includes: - 1 × 6-32 captive nut - 1 × #6 screw - 1 × #8 terminal - 1 × #6 terminal - 1 × #6 lock washer - 4 × #4 terminals **Type K** CHT, EGT and TIT thermocouples are identified by **red (-)** and **yellow (+)** wires. Type K thermocouples are manufactured using **alumel (red)** and **chromel (yellow)** metals. Type K is the industry standard for **EGT** and **TIT**, although some manufacturers specify Type K for use in digital and/or amplified **CHT** indicators. The Alcor CHT Bayonet Style Screw-in Probe is backed by an **industry-leading 5-year warranty**. --- ## Applications The Alcor 86253 CHT Bayonet Style Screw-in Probe is intended for: - Reciprocating-powered aircraft - Type K CHT instruments - Type K CHT leads - Digital Type K CHT systems - Amplified Type K CHT systems --- ## Why CJ Aerospace? CJ Aerospace supplies genuine Alcor engine monitoring products backed by expert technical support and fast local delivery. - 🇦🇺 **Australian-owned & operated** - 📦 **Stocked locally in Australia for fast dispatch** - 🔧 **Technical guidance on engine instrumentation selection and compatibility** - ✈️ **Trusted by aircraft owners, maintenance organisations and aviation professionals** > ✉️ [Contact us sales@cjaerospace.com.au](mailto:sales@cjaerospace.com.au) > Need help selecting the correct Alcor probe for your aircraft? Our team is ready to assist.

- Backed by an industry-leading **5-year warranty** - Small element diameter provides near-instantaneous instrument response - Provides sufficient electrical power for Alcor unamplified instruments - Intended for use with Type K CHT instruments and leads - Bayonet-style screw-in probe - Grounded thermocouple