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PartsTable / COMPONENT / SC3549 3-4IN
SC3549 3-4IN ✓ 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: 3A SINGLE THREADED PORTION A, thread_length: 0.284 INCHES NOMINAL SINGLE THREADED PORTION IN, flange_diameter: 1.250 INCHES NOMINAL IN, special_features: USED ON 3/4 IN. SIZE STOP VALVE IN, style_designator: THREADED FLANGED.

This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-871-8935, 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
SC3549 3-4IN
NSN: 4820-00-871-8935
FSC: 4820
CAGE: 63686 — THE WALWORTH COMPANY (USA)
SPECIFICATIONS
materialNICKEL ALLOY OVERALL
thread_class3A SINGLE THREADED PORTION A
thread_length0.284 INCHES NOMINAL SINGLE THREADED PORTION IN
flange_diameter1.250 INCHES NOMINAL IN
special_featuresUSED ON 3/4 IN. SIZE STOP VALVE IN
style_designatorTHREADED FLANGED
seat_angle_in_deg20.333 NOMINAL
nominal_thread_size1.000 INCHES SINGLE THREADED PORTION IN
under_flange_height0.387 INCHES NOMINAL IN
body_inside_diameter0.575 INCHES NOMINAL IN
seating_surface_shapeANGULAR
thread_series_designatorUNEF SINGLE THREADED PORTION
NSN4820-00-871-8935
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: SC3549 3-4IN · 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
•
MATERIAL: NICKEL ALLOY OVERALL
•
BODY INSIDE DIAMETER: 0.575 INCHES NOMINAL IN
•
STYLE DESIGNATOR: THREADED FLANGED
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-M-20164 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
THREAD CLASS: 3A SINGLE THREADED PORTION A
•
UNDER FLANGE HEIGHT: 0.387 INCHES NOMINAL IN
•
SEATING SURFACE SHAPE: ANGULAR
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALNICKEL ALLOY OVERALL
BODY INSIDE DIAMETER0.575 INCHES NOMINAL IN
STYLE DESIGNATORTHREADED FLANGED
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-M-20164 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
THREAD CLASS3A SINGLE THREADED PORTION A
UNDER FLANGE HEIGHT0.387 INCHES NOMINAL IN
SPECIAL FEATURESUSED ON 3/4 IN. SIZE STOP VALVE IN
SEATING SURFACE SHAPEANGULAR
SEAT ANGLE IN DEG20.333 NOMINAL
FLANGE DIAMETER1.250 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 28
2620-902 ASSY CInterchangeable
interchangeable cross-reference
interchangeable
845-1889587ASSYCFInterchangeable
interchangeable cross-reference
interchangeable
2620-902Interchangeable
interchangeable cross-reference
interchangeable
70061939AND70061940Interchangeable
interchangeable cross-reference
interchangeable
2620-902ASSYAAPC23 1INInterchangeable
interchangeable cross-reference
interchangeable
5160-B1-380Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is SC3549 3-4IN?
SC3549 3-4IN is a SEAT,VALVE.
What parts can replace SC3549 3-4IN?
There are 28 known substitutes for SC3549 3-4IN: 2620-902 ASSY C, 845-1889587ASSYCF, 2620-902 and 25 more. Substitute compatibility should be verified for your specific system.
What is the NSN for SC3549 3-4IN?
SC3549 3-4IN is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-871-8935. 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