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Technical Data Sheet
PartsTable / MRO / B165
B165 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
WHAT YOU NEED TO KNOW
Full open or full close only — never throttle Rising stem shows position visually
Throttling a gate valve erodes seats
PRODUCT OVERVIEW

THERMAL RELEASE,CIRCUIT BREAKER. Key specifications include material: COPPER ALLOY AND NICKEL ALLOY, stem_type: NONRISING, thickness: 0.560 INCHES NOMINAL IN, flow_angle: 90.0 DEGREES, leg_length: 2.120 INCHES NOMINAL FIRST END IN, sweep_type: SHORT. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-174-1245, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
MRO→ MRO_GENERAL→ B165
NSN: 4820-00-174-1245
FSC: 4820
CAGE: 80064 — NAVAL SHIP SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialCOPPER ALLOY AND NICKEL ALLOY
stem_typeNONRISING
thickness0.560 INCHES NOMINAL IN
flow_angle90.0 DEGREES
leg_length2.120 INCHES NOMINAL FIRST END IN
sweep_typeSHORT
valve_size0.500 INCHES IN
bonnet_typeINSIDE SCREW
neck_height2.000 INCHES NOMINAL IN
temp_rating775.0 FAHRENHEIT NOMINAL DEGF
constructionSEAMLESS
flange_shapeROUND WITH HOLES ALL ENDS
NSN4820-00-174-1245
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: B165 · OEM ⚠ VERIFY BEFORE ORDERING Gate valves = FULL OPEN or FULL CLOSE only — never throttle. Partial opening causes seat erosion and vibration. ✓ BROKER TIP Rising stem shows valve position visually — easier maintenance. Non-rising stem saves headroom. PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
MATERIAL: COPPER ALLOY BODY
•
MAXIMUM OPERATING TEMP AND MEDIA FOR WHICH DESIGNED: 425.0 FAHRENHEIT STEAM AND 150.0 FAHRENHEIT WATER-OIL-GAS DEGF
•
STEM TYPE: NONRISING
•
NOMINAL THREAD SIZE: 1.090 INCHES IN
•
THREAD SERIES DESIGNATOR: UNS
•
OPERATING PRESSURE AND TYPE: 200.0 POUNDS PER SQUARE INCH (PSI) STEAM MAXIMUM REQUIRED AND 400.0 POUNDS PER SQUARE INCH (PSI) WATER AND OTHER LIQUIDS MAXIMUM REQUIRED LOCATION NOT OTHERWISE SPECIFIED LBS
•
BONNET TYPE: INSIDE SCREW
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALCOPPER ALLOY BODY
MAXIMUM OPERATING TEMP AND MEDIA FOR WHICH DESIGNED425.0 FAHRENHEIT STEAM AND 150.0 FAHRENHEIT WATER-OIL-GAS DEGF
STEM TYPENONRISING
NOMINAL THREAD SIZE1.090 INCHES IN
THREAD SERIES DESIGNATORUNS
OPERATING PRESSURE AND TYPE200.0 POUNDS PER SQUARE INCH (PSI) STEAM MAXIMUM REQUIRED AND 400.0 POUNDS PER SQUARE INCH (PSI) WATER AND OTHER LIQUIDS MAXIMUM REQUIRED LOCATION NOT OTHERWISE SPECIFIED LBS
MATERIALNICKEL ALLOY DISK
BONNET TYPEINSIDE SCREW
MATERIALCOPPER ALLOY SEAT
MATERIALNICKEL ALLOY STEM
VERIFIED SUBSTITUTES & CROSS-REFERENCES 1
B165ALT8Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B165?
B165 is a THERMAL RELEASE,CIRCUIT BREAKER. It is classified as a MRO (MRO_GENERAL).
What parts can replace B165?
There is 1 known substitute for B165: B165ALT8. Substitute compatibility should be verified for your specific system.
What is the NSN for B165?
B165 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-174-1245. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026