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44477 ✓ Verified by PartsTable
— · GATE VALVE
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

The DISK,VALVE is a the manufacturer industrial component. Key specifications include color: BLACK, shank_style: STRAIGHT, overall_depth: 0.469 INCHES NOMINAL IN, shank_diameter: 0.750 INCHES NOMINAL IN, inside_diameter: 0.250 INCHES NOMINAL IN, outside_diameter: 1.375 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-334-3866, 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
44477
NSN: 4820-00-334-3866
FSC: 4820
CAGE: 53059 — SPIRAX SARCO INC DBA SPIRAX SARCO (USA)
SPECIFICATIONS
colorBLACK
shank_styleSTRAIGHT
overall_depth0.469 INCHES NOMINAL IN
shank_diameter0.750 INCHES NOMINAL IN
inside_diameter0.250 INCHES NOMINAL IN
outside_diameter1.375 INCHES NOMINAL IN
screw_drive_typeHEXAGON SOCKET
style_designatorCROWN
attachment_methodSETSCREWS
overall_thickness0.688 INCHES NOMINAL IN
nominal_thread_size0.164 INCHES SCREW HOLE IN
setscrew_hole_quantity1
NSN4820-00-334-3866
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 44477 · 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
•
NOMINAL THREAD SIZE: 0.313 INCHES IN
•
SEAT ANGLE: 37.0 DEGREES NOMINAL
•
THREAD SERIES DESIGNATOR: UNF
•
MATERIAL: STEEL CORROSION RESISTING
•
OUTSIDE DIAMETER: 0.652 INCHES NOMINAL IN
•
STYLE DESIGNATOR: PLUG
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL THREAD SIZE0.313 INCHES IN
SEAT ANGLE37.0 DEGREES NOMINAL
THREAD SERIES DESIGNATORUNF
MATERIALSTEEL CORROSION RESISTING
OVERALL HEIGHT0.996 INCHES NOMINAL IN
OUTSIDE DIAMETER0.652 INCHES NOMINAL IN
SPECIAL FEATURESSTEM,LOCKING SETSCREWIN BODY
STYLE DESIGNATORPLUG
THREAD CLASS2B
VERIFIED SUBSTITUTES & CROSS-REFERENCES 2
S81-3Interchangeable
interchangeable cross-reference
interchangeable
44477Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 44477?
44477 is a DISK,VALVE.
What parts can replace 44477?
There are 2 known substitutes for 44477: S81-3, 44477. Substitute compatibility should be verified for your specific system.
What is the NSN for 44477?
44477 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-334-3866. 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