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55987 — DUCT ASSEMBLY,AIR CONDITIONING-H

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

55987: DUCT ASSEMBLY,AIR CONDITIONING-H.

DUCT ASSEMBLY,AIR CONDITIONING-H. Key specifications include material: STEEL COMP E4340 OR STEEL COMP 4340 OVERALL, head_style: DEE, head_height: 0.250 INCHES NOMINAL IN, thread_class: 3A A, head_diameter: 1.375 INCHES NOMINAL IN, thread_length: 0.560 INCHES MINIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-096-7991, 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
55987
NSN: 4820-00-096-7991
NIINs: 000967991, 003275148, 003667152, 007266033
FSC: 4820 — Valves, Nonpowered
CAGE: 63686 — THE WALWORTH COMPANY (USA)
SPECIFICATIONS
materialSTEEL COMP E4340 OR STEEL COMP 4340 OVERALL
head_styleDEE
head_height0.250 INCHES NOMINAL IN
thread_class3A A
head_diameter1.375 INCHES NOMINAL IN
thread_length0.560 INCHES MINIMUM IN
fastener_length1.906 INCHES NOMINAL IN
thread_directionRIGHT-HAND
features_providedFINISHED HEAD
surface_treatmentCADMIUM OVERALL
nominal_thread_diameter0.750 INCHES IN
minimum_tensile_strength180000 POUNDS PER SQUARE INCH LBS
NSN4820-00-096-7991
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 55987 · 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
•
OUTSIDE DIAMETER: 0.686 INCHES NOMINAL IN
•
STYLE DESIGNATOR: PLUG
•
SEAT RADIUS: 0.200 INCHES NOMINAL IN
•
MATERIAL: COPPER ALLOY
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.571 INCHES NOMINAL IN
OUTSIDE DIAMETER0.686 INCHES NOMINAL IN
STYLE DESIGNATORPLUG
SEAT RADIUS0.200 INCHES NOMINAL IN
MATERIALCOPPER ALLOY
SUBSTITUTES & CROSS-REFERENCES 5
DS2078FRFPC4-1-4Reference document
Same NSN cross-reference
Reference document — Secondary reference
4DP2033APC4-3-8Reference document
Same NSN cross-reference
Reference document — Secondary reference
160WS3-8DISCReference document
Same NSN cross-reference
Reference document — Secondary reference
160-1-4DISCReference document
Same NSN cross-reference
Reference document — Secondary reference
C8922-5RCReference document
Same NSN cross-reference
Reference document — Secondary reference
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 55987?
55987 is a DUCT ASSEMBLY,AIR CONDITIONING-H.
What parts can replace 55987?
There are 5 known substitutes for 55987: DS2078FRFPC4-1-4, 4DP2033APC4-3-8, 160WS3-8DISC and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 55987?
55987 is cataloged in the U.S. Government catalog under NSN 4820-00-096-7991. 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.