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28891 — TRANSFORMER,AUDIO FREQUENCY

✓ Government record, cited
Legrand · GATE VALVE
PRODUCT OVERVIEW

28891: TRANSFORMER,AUDIO FREQUENCY.

The TRANSFORMER,AUDIO FREQUENCY is a Legrand industrial component. Key specifications include material: NICKEL ALLOY BODY, head_style: PAN, seat_angle: 37.0 DEGREES ALL ENDS, body_length: 1.120 INCHES MAXIMUM IN, thread_class: 2A A, inclosure_type: FULLY INCLOSED. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-885-1619, 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
28891
NSN: 4820-00-885-1619
NIINs: 008851619, 013262277, 015644254, 016860821
FSC: 4820 — Valves, Nonpowered
CAGE: 55820 — RTX CORPORATION DIV PRATT & WHITNEY (USA)
SPECIFICATIONS
materialNICKEL ALLOY BODY
head_stylePAN
seat_angle37.0 DEGREES ALL ENDS
body_length1.120 INCHES MAXIMUM IN
thread_class2A A
inclosure_typeFULLY INCLOSED
screw_materialSTEEL
connection_typeTHREADED EXTERNAL TUBE ALL ENDS
fastener_length0.750 INCHES NOMINAL IN
mounting_methodTHREADED STUD(S) SINGLE GROUP
connection_styleFLARED (TUBE) ALL ENDS
frequency_rating15.0 KILOHERTZ NOMINAL SINGLE COMPONENT
NSN4820-00-885-1619
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 28891 · Legrand ⚠ 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
•
FLOW CONTROL DEVICE: BALL
•
CONNECTION STYLE: FLARED (TUBE) ALL ENDS
•
MOUNTING POSITION: HORIZONTAL
•
CONNECTION TYPE: THREADED EXTERNAL TUBE ALL ENDS
•
STYLE DESIGNATOR: ANGLE
•
THREAD DIRECTION: RIGHT-HAND ALL ENDS
•
NOMINAL THREAD SIZE: 0.562 INCHES ALL ENDS IN
•
SEAT ANGLE: 37.0 DEGREES ALL ENDS
TECHNICAL CHARACTERISTICS
FLOW CONTROL DEVICEBALL
CONNECTION STYLEFLARED (TUBE) ALL ENDS
MOUNTING POSITIONHORIZONTAL
CONNECTION TYPETHREADED EXTERNAL TUBE ALL ENDS
STYLE DESIGNATORANGLE
THREAD DIRECTIONRIGHT-HAND ALL ENDS
NOMINAL THREAD SIZE0.562 INCHES ALL ENDS IN
SEAT ANGLE37.0 DEGREES ALL ENDS
THREAD CLASS3A ALL ENDS A
MATERIALNICKEL ALLOY BODY
SUBSTITUTES & CROSS-REFERENCES 1
28891-1Reference 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 28891?
28891 is a TRANSFORMER,AUDIO FREQUENCY manufactured by Legrand.
What parts can replace 28891?
There is 1 known substitute for 28891: 28891-1. Substitute compatibility should be verified for your specific system.
What is the NSN for 28891?
28891 is cataloged in the U.S. Government catalog under NSN 4820-00-885-1619. 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.