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PartsTable / COMPONENT / GS557A1
GS557A1 ✓ 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

RESISTOR,FIXED,WIRE WOUND,INDUCT. Key specifications include width: 7.875 INCHES NOMINAL IN, height: 9.000 INCHES NOMINAL IN, length: 13.250 INCHES NOMINAL IN, end_type: COMPRESSION RING AND NUT FIRST END, material: STEEL OVERALL, nut_style: HEXAGON. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-122-9519, 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
GS557A1
NSN: 4820-01-122-9519
FSC: 4820
CAGE: 26512 — NORTHROP GRUMMAN SYSTEMS CORPORATION (USA)
SPECIFICATIONS
width7.875 INCHES NOMINAL IN
height9.000 INCHES NOMINAL IN
length13.250 INCHES NOMINAL IN
end_typeCOMPRESSION RING AND NUT FIRST END
materialSTEEL OVERALL
nut_styleHEXAGON
thickness0.188 INCHES NOMINAL IN
lens_colorRED AND AMBER
nut_height0.375 INCHES NOMINAL IN
body_length1.750 INCHES NOMINAL IN
engine_typeGASOLINE
thread_class2B
NSN4820-01-122-9519
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: GS557A1 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
31-050TInterchangeable
interchangeable cross-reference
interchangeable
3802Interchangeable
interchangeable cross-reference
interchangeable
CPR11Interchangeable
interchangeable cross-reference
interchangeable
203802Interchangeable
interchangeable cross-reference
interchangeable
07-203802Interchangeable
interchangeable cross-reference
interchangeable
271506Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is GS557A1?
GS557A1 is a RESISTOR,FIXED,WIRE WOUND,INDUCT.
What parts can replace GS557A1?
There are 18 known substitutes for GS557A1: 31-050T, 3802, CPR11 and 15 more. Substitute compatibility should be verified for your specific system.
What is the NSN for GS557A1?
GS557A1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-122-9519. 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