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PartsTable / COMPONENT / 549-1 PIECE 4
549-1 PIECE 4 ✓ 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 RESISTOR,FIXED,COMPOSITION is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, thread_class: 2A SINGLE THREADED PORTION A, thread_length: 0.395 INCHES NOMINAL SINGLE THREADED PORTION IN, flange_diameter: 1.565 INCHES NOMINAL IN, style_designator: THREADED FLANGED, seat_angle_in_deg: 30.000 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 4820-01-107-7181, 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
549-1 PIECE 4
NSN: 4820-01-107-7181
FSC: 4820
CAGE: 76364 — MILWAUKEE VALVE CO, INC DIV MILWAUKEE VALVE COMPANY, LLC (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
thread_class2A SINGLE THREADED PORTION A
thread_length0.395 INCHES NOMINAL SINGLE THREADED PORTION IN
flange_diameter1.565 INCHES NOMINAL IN
style_designatorTHREADED FLANGED
seat_angle_in_deg30.000 NOMINAL
nominal_thread_size1.375 INCHES SINGLE THREADED PORTION IN
under_flange_height0.395 INCHES NOMINAL IN
body_inside_diameter1.000 INCHES NOMINAL IN
seating_surface_shapeANGULAR
thread_quantity_per_inch2O SINGLE THREADED PORTION
thread_series_designatorUN SINGLE THREADED PORTION
NSN4820-01-107-7181
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 549-1 PIECE 4 · 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
•
THREAD QUANTITY PER INCH: 2O SINGLE THREADED PORTION
•
THREAD LENGTH: 0.395 INCHES NOMINAL SINGLE THREADED PORTION IN
•
THREAD CLASS: 2A SINGLE THREADED PORTION A
•
NOMINAL THREAD SIZE: 1.375 INCHES SINGLE THREADED PORTION IN
•
THREAD SERIES DESIGNATOR: UN SINGLE THREADED PORTION
•
MATERIAL: STEEL CORROSION RESISTING OVERALL
•
STYLE DESIGNATOR: THREADED FLANGED
•
FLANGE DIAMETER: 1.565 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD QUANTITY PER INCH2O SINGLE THREADED PORTION
THREAD LENGTH0.395 INCHES NOMINAL SINGLE THREADED PORTION IN
THREAD CLASS2A SINGLE THREADED PORTION A
NOMINAL THREAD SIZE1.375 INCHES SINGLE THREADED PORTION IN
THREAD SERIES DESIGNATORUN SINGLE THREADED PORTION
MATERIALSTEEL CORROSION RESISTING OVERALL
STYLE DESIGNATORTHREADED FLANGED
FLANGE DIAMETER1.565 INCHES NOMINAL IN
FLANGE SEAT TO DISK END HEIGHT0.165 INCHES NOMINAL IN
SEAT ANGLE IN DEG30.000 NOMINAL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
5491Interchangeable
interchangeable cross-reference
interchangeable
14000216-581Interchangeable
interchangeable cross-reference
interchangeable
35D2076222-1Interchangeable
interchangeable cross-reference
interchangeable
08-49003-27Interchangeable
interchangeable cross-reference
interchangeable
415891-22Interchangeable
interchangeable cross-reference
interchangeable
124663Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 549-1 PIECE 4?
549-1 PIECE 4 is a RESISTOR,FIXED,COMPOSITION.
What parts can replace 549-1 PIECE 4?
There are 15 known substitutes for 549-1 PIECE 4: 5491, 14000216-581, 35D2076222-1 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 549-1 PIECE 4?
549-1 PIECE 4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-107-7181. 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