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BB55S48-852PC4 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

BB55S48-852PC4: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thread_class: 2A SINGLE THREADED PORTION A, thread_length: 0.312 INCHES NOMINAL SINGLE THREADED PORTION IN, flange_diameter: 0.750 INCHES NOMINAL IN, hardness_rating: 300.0 BRINELL STANDARD MINIMUM OVERALL, special_features: HEX SHAPED FLANGE. This part is cataloged in the U.S.

Government catalog under NSN 4810-00-338-3063, 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
BB55S48-852PC4
NSN: 4810-00-338-3063
FSC: 4810 — Valves, Powered
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thread_class2A SINGLE THREADED PORTION A
thread_length0.312 INCHES NOMINAL SINGLE THREADED PORTION IN
flange_diameter0.750 INCHES NOMINAL IN
hardness_rating300.0 BRINELL STANDARD MINIMUM OVERALL
special_featuresHEX SHAPED FLANGE
style_designatorTHREADED FLANGED
nominal_thread_size0.562 INCHES SINGLE THREADED PORTION IN
under_flange_height0.312 INCHES NOMINAL IN
body_inside_diameter0.281 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
seating_surface_shapeANGULAR
thread_quantity_per_inch20 SINGLE THREADED PORTION
NSN4810-00-338-3063
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: BB55S48-852PC4 · 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
•
FLANGE SEAT TO DISK END HEIGHT: 0.185 INCHES MINIMUM AND 0.191 INCHES MAXIMUM IN
•
FLANGE DIAMETER: 0.750 INCHES NOMINAL IN
•
THREAD LENGTH: 0.312 INCHES NOMINAL SINGLE THREADED PORTION IN
•
HARDNESS RATING: 300.0 BRINELL STANDARD MINIMUM OVERALL
•
STYLE DESIGNATOR: THREADED FLANGED
•
BODY INSIDE DIAMETER: 0.281 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
•
NOMINAL THREAD SIZE: 0.562 INCHES SINGLE THREADED PORTION IN
TECHNICAL CHARACTERISTICS
FLANGE SEAT TO DISK END HEIGHT0.185 INCHES MINIMUM AND 0.191 INCHES MAXIMUM IN
FLANGE DIAMETER0.750 INCHES NOMINAL IN
THREAD LENGTH0.312 INCHES NOMINAL SINGLE THREADED PORTION IN
HARDNESS RATING300.0 BRINELL STANDARD MINIMUM OVERALL
STYLE DESIGNATORTHREADED FLANGED
BODY INSIDE DIAMETER0.281 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
NOMINAL THREAD SIZE0.562 INCHES SINGLE THREADED PORTION IN
SPECIAL FEATURESHEX SHAPED FLANGE
UNDER FLANGE HEIGHT0.312 INCHES NOMINAL IN
THREAD CLASS2A SINGLE THREADED PORTION A
OTHER ITEMS IN FSC 4810 — Valves, Powered
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4810-00-001-1247 4810-00-001-4499 4810-00-001-4531 4810-00-001-4532 4810-00-001-4554 4810-00-001-4555 4810-00-001-4556 4810-00-001-4611
SUBSTITUTES & CROSS-REFERENCES 10
D21132PC4Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
D20450PC4Reference document
Same NSN cross-reference
Reference document — Secondary reference
D21138PC4Reference document
Same NSN cross-reference
Reference document — Secondary reference
D20550PC3Reference document
Same NSN cross-reference
Reference document — Secondary reference
D20764PC4Reference document
Same NSN cross-reference
Reference document — Secondary reference
D20393PC3Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is BB55S48-852PC4?
BB55S48-852PC4 is a SEAT,VALVE.
What parts can replace BB55S48-852PC4?
There are 10 known substitutes for BB55S48-852PC4: D21132PC4, D20450PC4, D21138PC4 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for BB55S48-852PC4?
BB55S48-852PC4 is cataloged in the U.S. Government catalog under NSN 4810-00-338-3063. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.