6553-255 PIECE 9 — SEAT,VALVE

✓ Government record, cited

— · GATE VALVE

PRODUCT OVERVIEW

6553-255 PIECE 9: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY OVERALL, thread_class: 2A SINGLE THREADED PORTION A, thread_length: 0.500 INCHES NOMINAL SINGLE THREADED PORTION IN, overall_height: 0.634 INCHES NOMINAL IN, special_features: W/2 STD WRENCH NOTCHES ON THE ID, style_designator: PLAIN THREADED. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-181-8657, 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

6553-255 PIECE 9

NSN: 4820-01-181-8657
FSC: 4820 — Valves, Nonpowered
CAGE: 43689 — HUNTINGTON INGALLS INC DIV NEWPORT NEWS SHIPBUILDING (USA)

SPECIFICATIONS

material	NICKEL ALLOY OVERALL
thread_class	2A SINGLE THREADED PORTION A
thread_length	0.500 INCHES NOMINAL SINGLE THREADED PORTION IN
overall_height	0.634 INCHES NOMINAL IN
special_features	W/2 STD WRENCH NOTCHES ON THE ID
style_designator	PLAIN THREADED
nominal_thread_size	5.375 INCHES SINGLE THREADED PORTION IN
body_inside_diameter	4.250 INCHES NOMINAL IN
seating_surface_shape	FLAT
thread_quantity_per_inch	12 SINGLE THREADED PORTION
thread_series_designator	UN SINGLE THREADED PORTION
NSN	4820-01-181-8657

COMPONENT DIAGRAM

KEY FEATURES

•

THREAD LENGTH: 0.500 INCHES NOMINAL SINGLE THREADED PORTION IN

•

STYLE DESIGNATOR: PLAIN THREADED

•

BODY INSIDE DIAMETER: 4.250 INCHES NOMINAL IN

•

NOMINAL THREAD SIZE: 5.375 INCHES SINGLE THREADED PORTION IN

•

THREAD CLASS: 2A SINGLE THREADED PORTION A

•

THREAD QUANTITY PER INCH: 12 SINGLE THREADED PORTION

TECHNICAL CHARACTERISTICS

OVERALL HEIGHT	0.634 INCHES NOMINAL IN
THREAD LENGTH	0.500 INCHES NOMINAL SINGLE THREADED PORTION IN
STYLE DESIGNATOR	PLAIN THREADED
BODY INSIDE DIAMETER	4.250 INCHES NOMINAL IN
NOMINAL THREAD SIZE	5.375 INCHES SINGLE THREADED PORTION IN
SPECIAL FEATURES	W/2 STD WRENCH NOTCHES ON THE ID
THREAD CLASS	2A SINGLE THREADED PORTION A
THREAD QUANTITY PER INCH	12 SINGLE THREADED PORTION
MATERIAL	NICKEL ALLOY OVERALL
THREAD SERIES DESIGNATOR	UN SINGLE THREADED PORTION

SUBSTITUTES & CROSS-REFERENCES 2

208-4325303Reference document

Same NSN cross-reference

Reference document — Drawing number reference only

6553-255Reference document

Same NSN cross-reference

Reference document — Drawing number reference only

LIFECYCLE

NSN statusActive· U.S. Government catalog

Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required

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FREQUENTLY ASKED QUESTIONS

What is 6553-255 PIECE 9?

6553-255 PIECE 9 is a SEAT,VALVE.

What parts can replace 6553-255 PIECE 9?

There are 2 known substitutes for 6553-255 PIECE 9: 208-4325303, 6553-255. Substitute compatibility should be verified for your specific system.

What is the NSN for 6553-255 PIECE 9?

6553-255 PIECE 9 is cataloged in the U.S. Government catalog under NSN 4820-01-181-8657. This indicates validated use in U.S. government and defense supply chains.

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6553-255 PIECE 9 — SEAT,VALVE

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