FSC 6685 is the U.S. Federal Supply Class for Pressure, Temperature, and Humidity Measuring and Controlling Instruments, in Federal Supply Group 66 (Instruments and Laboratory Equipment). Aviation Parts Executive lists 37 parts whose part numbers carry a National Stock Number (NSN) in this class. Search any NSN or NIIN on our site to open the part.

Includes thermometers, including engine thermometers; pressure gages; thermocouple leads; resistance bulbs.

Excludes clinical therometers; (FSC 6515); thermostatic and differential pressure switches (FSC 5930); and meteorological instruments (FSC 6660).

Our Parts In FSC 6685 (37)

Part Number	NSN	Item Name	Manufacturer
011-00978-00	6685-01-585-1246	Thermocouple, Immersion	Garmin
011-00981-00	6685-01-585-3413	Thermocouple, Contact	Garmin
100-364295-3	6685-01-308-0620	Control, Temperature, Indicating	Cessna
101-00212	6685-01-607-5560	Tester, Pressure Gage	Barfield
101-384126-1	6685-01-493-4883	Pyrometer, Indicating	Cessna
101-384133-0003	6685-01-678-6833	Gage, Vacuum, Indicating	Cessna
101-389023-7	6685-01-706-4252	Transmitter, Pressure	Cessna
23031050	6685-01-326-2418	Probe, Humidity-Temperature	Rolls Royce
23034926	6685-01-470-5600	Thermocouple, Contact	Rolls Royce
23034927	6685-01-475-2725	Thermocouple, Contact	Rolls Royce
23056724	6685-01-444-0581	Thermocouple, Contact	Rolls Royce
23059920	6685-01-497-3762	Thermocouple, Immersion	Rolls Royce
23059921	6685-01-497-3763	Thermocouple, Immersion	Rolls Royce
23073715	6685-01-543-6410	Transmitter, Pressure	Rolls Royce
23075403	6685-01-507-5310	Thermocouple, Contact	Rolls Royce
300-0656-2	6685-01-706-3946	Sensor, Ambient Temperature	Cessna
304-00004	6685-01-498-9021	Tester, Pressure Gage	Barfield
304-00006	6685-01-664-3087	Gage, Pressure, Dial Indicating	Barfield
304-00103	6685-01-634-0611	Indicator, Pressure	Barfield
486-483	6685-01-672-0273	Sensor, Ambient Temperature	Piper
494-70009-00	6685-01-701-9089	Sensor, Ambient Temperature	Garmin
50-380105-1	6685-01-314-6200	Indicator, Pressure	Cessna
5006586	6685-01-551-9548	Thermostat, Flow Control	Meggitt Aircraft
6850132	6685-00-078-3544	Thermocouple, Immersion	Rolls Royce
6851875	6685-00-961-6449	Thermocouple, Immersion	Rolls Royce
86252	6685-01-703-0018	Sensor, Ambient Temperature	Alcor
86255	6685-01-503-0770	Sensor, Ambient Temperature	Alcor
99-384042-1	6685-00-995-1323	Gage, Pressure, Dial Indicating	Cessna
C307PS	6685-01-685-7508	Sensor, Ambient Temperature	Davtron
C668540-0101	6685-00-438-4722	Gage, Vacuum, Indicating	Cessna
CST-3700	6685-01-714-8200	Tester, Pressurized Container Lea	Hartzell
G-714127	6685-01-469-8854	Thermostat, Flow Control	Cessna
MS20003-2	6685-00-752-8240	Indicator, Humidity, Card	Lycoming
MS28034-1	6685-00-373-9004	Transmitter, Temperature, Electric	Continental
MS28034-3	6685-00-580-9651	Transmitter, Temperature, Electric	Cessna
S2334-3	6685-01-364-0457	Thermocouple, Immersion	Cessna
S3279-1	6685-01-575-3604	Indicator, Pressure	Cessna

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NSNs, item names and Federal Supply Class descriptions come from the Defense Logistics Agency's public Federal Logistics Information System data (PUB LOG, October 27, 2026 release). We show an NSN only when the government record lists our part number under the same manufacturer (CAGE code). Confirm the NSN and part number on your solicitation before you order.