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PartsTable / COMPONENT / 21549-1
21549-1 ✓ 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

CONNECTOR,RECEPTACLE,ELECTRICAL. Key specifications include material: STEEL COMP 416 OVERALL, flange_diameter: 0.656 INCHES NOMINAL IN, hardness_rating: 28.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM OVERALL, style_designator: PLAIN FLANGED, under_flange_height: 0.232 INCHES NOMINAL IN, body_inside_diameter: 0.315 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-031-7453, 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
21549-1
NSN: 4820-00-031-7453
FSC: 4820
CAGE: 07KQ5 — DEFENSE & DEVELOPMENT ENTERPRISES LLC (USA)
SPECIFICATIONS
materialSTEEL COMP 416 OVERALL
flange_diameter0.656 INCHES NOMINAL IN
hardness_rating28.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM OVERALL
style_designatorPLAIN FLANGED
under_flange_height0.232 INCHES NOMINAL IN
body_inside_diameter0.315 INCHES NOMINAL IN
fsc_application_dataACFT HYD SYSTEM
body_outside_diameter0.495 INCHES NOMINAL IN
end_item_identification6610-01-119-2298
flange_seat_to_disk_end_height0.048 INCHES NOMINAL IN
material_document_and_classificationQQ-S-763 CL 6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
general_characteristics_item_descriptionINCLUDES GEAR SECTOR,AIRSPEED HAIRSPRING,COUNTERWEIGHT,JEWEL BUSHING PIVOT,SHAFT,AND MOUNTED CAP JEWEL
NSN4820-00-031-7453
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 21549-1 · 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
•
BODY OUTSIDE DIAMETER: 0.495 INCHES NOMINAL IN
•
HARDNESS RATING: 28.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-763 CL 6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
MATERIAL: STEEL COMP 416 OVERALL
•
FSC APPLICATION DATA: VALVE
•
STYLE DESIGNATOR: PLAIN FLANGED
•
UNDER FLANGE HEIGHT: 0.232 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
BODY OUTSIDE DIAMETER0.495 INCHES NOMINAL IN
HARDNESS RATING28.0 ROCKWELL C MINIMUM AND 34.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-763 CL 6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
MATERIALSTEEL COMP 416 OVERALL
FSC APPLICATION DATAVALVE
STYLE DESIGNATORPLAIN FLANGED
UNDER FLANGE HEIGHT0.232 INCHES NOMINAL IN
END ITEM IDENTIFICATION4820&670&6583
FLANGE DIAMETER0.656 INCHES NOMINAL IN
FLANGE SEAT TO DISK END HEIGHT0.048 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
215491Interchangeable
interchangeable cross-reference
interchangeable
21549Interchangeable
interchangeable cross-reference
interchangeable
KC4070Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21549-1?
21549-1 is a CONNECTOR,RECEPTACLE,ELECTRICAL.
What parts can replace 21549-1?
There are 3 known substitutes for 21549-1: 215491, 21549, KC4070. Substitute compatibility should be verified for your specific system.
What is the NSN for 21549-1?
21549-1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-031-7453. 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