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27125-42 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

27125-42: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY SEAT, thread_class: 2A SINGLE THREADED PORTION A, thread_length: 0.585 INCHES NOMINAL SINGLE THREADED PORTION IN, flange_diameter: 5.435 INCHES NOMINAL IN, style_designator: THREADED FLANGED, nominal_thread_size: 4.750 INCHES SINGLE THREADED PORTION IN. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-186-8685, 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
27125-42
NSN: 4820-01-186-8685
FSC: 4820 — Valves, Nonpowered
CAGE: 35795 — LESLIE CONTROLS, INC. DBA LESLIE CONTROLS INC (USA)
SPECIFICATIONS
materialNICKEL ALLOY SEAT
thread_class2A SINGLE THREADED PORTION A
thread_length0.585 INCHES NOMINAL SINGLE THREADED PORTION IN
flange_diameter5.435 INCHES NOMINAL IN
style_designatorTHREADED FLANGED
nominal_thread_size4.750 INCHES SINGLE THREADED PORTION IN
under_flange_height0.750 INCHES NOMINAL IN
body_inside_diameter3.976 INCHES NOMINAL IN
seating_surface_shapeFLAT
thread_quantity_per_inch14 SINGLE THREADED PORTION
thread_series_designatorUNS SINGLE THREADED PORTION
flange_seat_to_disk_end_height0.440 INCHES NOMINAL IN
NSN4820-01-186-8685
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 27125-42 · 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
•
FLANGE SEAT TO DISK END HEIGHT: 0.440 INCHES NOMINAL IN
•
FLANGE DIAMETER: 5.435 INCHES NOMINAL IN
•
THREAD LENGTH: 0.585 INCHES NOMINAL SINGLE THREADED PORTION IN
•
STYLE DESIGNATOR: THREADED FLANGED
•
BODY INSIDE DIAMETER: 3.976 INCHES NOMINAL IN
•
NOMINAL THREAD SIZE: 4.750 INCHES SINGLE THREADED PORTION IN
•
UNDER FLANGE HEIGHT: 0.750 INCHES NOMINAL IN
•
THREAD CLASS: 2A SINGLE THREADED PORTION A
TECHNICAL CHARACTERISTICS
FLANGE SEAT TO DISK END HEIGHT0.440 INCHES NOMINAL IN
FLANGE DIAMETER5.435 INCHES NOMINAL IN
THREAD LENGTH0.585 INCHES NOMINAL SINGLE THREADED PORTION IN
STYLE DESIGNATORTHREADED FLANGED
BODY INSIDE DIAMETER3.976 INCHES NOMINAL IN
NOMINAL THREAD SIZE4.750 INCHES SINGLE THREADED PORTION IN
UNDER FLANGE HEIGHT0.750 INCHES NOMINAL IN
THREAD CLASS2A SINGLE THREADED PORTION A
THREAD QUANTITY PER INCH14 SINGLE THREADED PORTION
MATERIALNICKEL ALLOY SEAT
OTHER ITEMS IN FSC 4820 — Valves, Nonpowered
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4820-00-000-0097 4820-00-001-0010 4820-00-001-0020 4820-00-001-0021 4820-00-001-0032 4820-00-001-0037 4820-00-001-0042 4820-00-001-1230
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

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 27125-42?
27125-42 is a SEAT,VALVE.
What is the NSN for 27125-42?
27125-42 is cataloged in the U.S. Government catalog under NSN 4820-01-186-8685. 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.