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B5493 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

B5493: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY OVERALL, seat_radius: 0.188 INCHES NOMINAL IN, thread_class: 2A SINGLE THREADED PORTION A, thread_length: 0.375 INCHES NOMINAL SINGLE THREADED PORTION IN, flange_diameter: 2.125 INCHES NOMINAL IN, special_features: TWO LUGS 1/2 IN. W X 9/32 IN.

LG,LOCKATED ON OUTER EDGE OF TOP,SPACED 180 DEG APART IN. This part is cataloged in the U.S. Government catalog under NSN 4820-00-441-2348, 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
B5493
NSN: 4820-00-441-2348
FSC: 4820 — Valves, Nonpowered
CAGE: 33547 — KIELEY AND MUELLER INC SUB OF JOHNSON CONTROLS INC (USA)
SPECIFICATIONS
materialNICKEL ALLOY OVERALL
seat_radius0.188 INCHES NOMINAL IN
thread_class2A SINGLE THREADED PORTION A
thread_length0.375 INCHES NOMINAL SINGLE THREADED PORTION IN
flange_diameter2.125 INCHES NOMINAL IN
special_featuresTWO LUGS 1/2 IN. W X 9/32 IN. LG,LOCKATED ON OUTER EDGE OF TOP,SPACED 180 DEG APART IN
style_designatorTHREADED FLANGED
nominal_thread_size1.875 INCHES SINGLE THREADED PORTION IN
under_flange_height0.500 INCHES NOMINAL IN
body_inside_diameter0.859 INCHES NOMINAL IN
seating_surface_shapeRADIAL
thread_quantity_per_inch16 SINGLE THREADED PORTION
NSN4820-00-441-2348
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: B5493 · 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: 0.125 INCHES NOMINAL IN
•
FLANGE DIAMETER: 2.125 INCHES NOMINAL IN
•
THREAD LENGTH: 0.375 INCHES NOMINAL SINGLE THREADED PORTION IN
•
STYLE DESIGNATOR: THREADED FLANGED
•
BODY INSIDE DIAMETER: 0.859 INCHES NOMINAL IN
•
NOMINAL THREAD SIZE: 1.875 INCHES SINGLE THREADED PORTION IN
•
SEAT RADIUS: 0.188 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
FLANGE SEAT TO DISK END HEIGHT0.125 INCHES NOMINAL IN
FLANGE DIAMETER2.125 INCHES NOMINAL IN
THREAD LENGTH0.375 INCHES NOMINAL SINGLE THREADED PORTION IN
STYLE DESIGNATORTHREADED FLANGED
BODY INSIDE DIAMETER0.859 INCHES NOMINAL IN
NOMINAL THREAD SIZE1.875 INCHES SINGLE THREADED PORTION IN
SEAT RADIUS0.188 INCHES NOMINAL IN
SPECIAL FEATURESTWO LUGS 1/2 IN. W X 9/32 IN. LG,LOCKATED ON OUTER EDGE OF TOP,SPACED 180 DEG APART IN
UNDER FLANGE HEIGHT0.500 INCHES NOMINAL IN
THREAD CLASS2A SINGLE THREADED PORTION A
OTHER ITEMS IN FSC 4820 — Valves, Nonpowered
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4820-00-000-0097 4820-00-001-0010 4820-00-001-0020 4820-00-001-0021 4820-00-001-0032 4820-00-001-0037 4820-00-001-0042 4820-00-001-1230
SUBSTITUTES & CROSS-REFERENCES 2
45987-0661Reference document
Same NSN cross-reference
Reference document — Secondary reference
D5494-000Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
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 B5493?
B5493 is a SEAT,VALVE.
What parts can replace B5493?
There are 2 known substitutes for B5493: 45987-0661, D5494-000. Substitute compatibility should be verified for your specific system.
What is the NSN for B5493?
B5493 is cataloged in the U.S. Government catalog under NSN 4820-00-441-2348. 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.