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PartsTable / COMPONENT / 51158-B-380
51158-B-380 ✓ 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

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY OVERALL, thread_class: 2A SINGLE THREADED PORTION A, thread_length: 0.205 INCHES NOMINAL SINGLE THREADED PORTION IN, flange_diameter: 0.750 INCHES NOMINAL IN, style_designator: THREADED FLANGED, seat_angle_in_deg: 45.000 NOMINAL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-100-2146, 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
51158-B-380
NSN: 4820-01-100-2146
FSC: 4820
CAGE: 76364 — MILWAUKEE VALVE CO, INC DIV MILWAUKEE VALVE COMPANY, LLC (USA)
SPECIFICATIONS
materialNICKEL ALLOY OVERALL
thread_class2A SINGLE THREADED PORTION A
thread_length0.205 INCHES NOMINAL SINGLE THREADED PORTION IN
flange_diameter0.750 INCHES NOMINAL IN
style_designatorTHREADED FLANGED
seat_angle_in_deg45.000 NOMINAL
nominal_thread_size0.625 INCHES SINGLE THREADED PORTION IN
under_flange_height0.286 INCHES NOMINAL IN
body_inside_diameter0.375 INCHES NOMINAL IN
seating_surface_shapeANGULAR
thread_series_designatorUNEF SINGLE THREADED PORTION
flange_seat_to_disk_end_height0.091 INCHES NOMINAL IN
NSN4820-01-100-2146
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 51158-B-380 · 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
•
UNDER FLANGE HEIGHT: 0.286 INCHES NOMINAL IN
•
MATERIAL: NICKEL ALLOY OVERALL
•
THREAD SERIES DESIGNATOR: UNEF SINGLE THREADED PORTION
•
STYLE DESIGNATOR: THREADED FLANGED
•
NOMINAL THREAD SIZE: 0.625 INCHES SINGLE THREADED PORTION IN
•
FLANGE DIAMETER: 0.750 INCHES NOMINAL IN
•
SEATING SURFACE SHAPE: ANGULAR
•
FLANGE SEAT TO DISK END HEIGHT: 0.091 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
UNDER FLANGE HEIGHT0.286 INCHES NOMINAL IN
MATERIALNICKEL ALLOY OVERALL
THREAD SERIES DESIGNATORUNEF SINGLE THREADED PORTION
STYLE DESIGNATORTHREADED FLANGED
NOMINAL THREAD SIZE0.625 INCHES SINGLE THREADED PORTION IN
FLANGE DIAMETER0.750 INCHES NOMINAL IN
SEATING SURFACE SHAPEANGULAR
FLANGE SEAT TO DISK END HEIGHT0.091 INCHES NOMINAL IN
SEAT ANGLE IN DEG45.000 NOMINAL
THREAD LENGTH0.205 INCHES NOMINAL SINGLE THREADED PORTION IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
SS845-1889587ASInterchangeable
interchangeable cross-reference
interchangeable
584-1-594-1Interchangeable
interchangeable cross-reference
interchangeable
51158DInterchangeable
interchangeable cross-reference
interchangeable
5160-F1-380Interchangeable
interchangeable cross-reference
interchangeable
51158-F-380Interchangeable
interchangeable cross-reference
interchangeable
2620-902ASSYD1IInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 51158-B-380?
51158-B-380 is a SEAT,VALVE.
What parts can replace 51158-B-380?
There are 11 known substitutes for 51158-B-380: SS845-1889587AS, 584-1-594-1, 51158D and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 51158-B-380?
51158-B-380 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-100-2146. 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