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R557-49330APC16 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

R557-49330APC16: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: COBALT ALLOY OVERALL, thread_class: 2A SINGLE THREADED PORTION A, thread_length: 0.438 INCHES NOMINAL SINGLE THREADED PORTION IN, flange_diameter: 2.188 INCHES NOMINAL IN, style_designator: THREADED FLANGED, nominal_thread_size: 2.000 INCHES SINGLE THREADED PORTION IN. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-346-6529, 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
R557-49330APC16
NSN: 4820-00-346-6529
FSC: 4820 — Valves, Nonpowered
CAGE: 38056 — ASHCROFT INC DBA HEISE (USA)
SPECIFICATIONS
materialCOBALT ALLOY OVERALL
thread_class2A SINGLE THREADED PORTION A
thread_length0.438 INCHES NOMINAL SINGLE THREADED PORTION IN
flange_diameter2.188 INCHES NOMINAL IN
style_designatorTHREADED FLANGED
nominal_thread_size2.000 INCHES SINGLE THREADED PORTION IN
under_flange_height0.438 INCHES NOMINAL IN
seating_surface_shapeFLAT
thread_quantity_per_inch16 SINGLE THREADED PORTION
thread_series_designatorUN SINGLE THREADED PORTION
body_stepped_inside_diameter1.436 INCHES MINIMUM AND 1.440 INCHES MAXIMUM THIRD STEP IN
flange_seat_to_disk_end_height0.438 INCHES NOMINAL IN
NSN4820-00-346-6529
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: R557-49330APC16 · 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: 0.438 INCHES NOMINAL IN
•
FLANGE DIAMETER: 2.188 INCHES NOMINAL IN
•
THREAD LENGTH: 0.438 INCHES NOMINAL SINGLE THREADED PORTION IN
•
BODY STEPPED INSIDE DIAMETER: 1.436 INCHES MINIMUM AND 1.440 INCHES MAXIMUM THIRD STEP IN
•
STYLE DESIGNATOR: THREADED FLANGED
•
NOMINAL THREAD SIZE: 2.000 INCHES SINGLE THREADED PORTION IN
TECHNICAL CHARACTERISTICS
FLANGE SEAT TO DISK END HEIGHT0.438 INCHES NOMINAL IN
FLANGE DIAMETER2.188 INCHES NOMINAL IN
THREAD LENGTH0.438 INCHES NOMINAL SINGLE THREADED PORTION IN
BODY STEPPED INSIDE DIAMETER1.436 INCHES MINIMUM AND 1.440 INCHES MAXIMUM THIRD STEP IN
BODY STEPPED INSIDE DIAMETER1.558 INCHES MINIMUM AND 1.568 INCHES MAXIMUM SECOND STEP IN
BODY STEPPED INSIDE DIAMETER1.695 INCHES MINIMUM AND 1.697 INCHES MAXIMUM FIRST STEP IN
STYLE DESIGNATORTHREADED FLANGED
NOMINAL THREAD SIZE2.000 INCHES SINGLE THREADED PORTION IN
UNDER FLANGE HEIGHT0.438 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 4
R557-49090APC16Reference document
Same NSN cross-reference
Reference document — Secondary reference
R557-49340CPC16Reference document
Same NSN cross-reference
Reference document — Secondary reference
H4820-346-6529Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
R557-49120APC16Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is R557-49330APC16?
R557-49330APC16 is a SEAT,VALVE.
What parts can replace R557-49330APC16?
There are 4 known substitutes for R557-49330APC16: R557-49090APC16, R557-49340CPC16, H4820-346-6529 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for R557-49330APC16?
R557-49330APC16 is cataloged in the U.S. Government catalog under NSN 4820-00-346-6529. 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.