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PartsTable / COMPONENT / 26M77-100 PIECE 18
26M77-100 PIECE 18 ✓ 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: 0.750 INCHES NOMINAL SINGLE THREADED PORTION IN, flange_diameter: 4.910 INCHES NOMINAL IN, style_designator: THREADED FLANGED, seat_angle_in_deg: 60.000 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 4820-01-161-0932, 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
26M77-100 PIECE 18
NSN: 4820-01-161-0932
FSC: 4820
CAGE: 96169 — ELECTRIC BOAT CORPORATION DIV GENERAL DYNAMICS ELECTRIC BOAT (USA)
SPECIFICATIONS
materialNICKEL ALLOY OVERALL
thread_class2A SINGLE THREADED PORTION A
thread_length0.750 INCHES NOMINAL SINGLE THREADED PORTION IN
flange_diameter4.910 INCHES NOMINAL IN
style_designatorTHREADED FLANGED
seat_angle_in_deg60.000 NOMINAL
nominal_thread_size4.500 INCHES SINGLE THREADED PORTION IN
under_flange_height0.875 INCHES NOMINAL IN
body_inside_diameter3.505 INCHES NOMINAL IN
seating_surface_shapeANGULAR
thread_quantity_per_inch11-1/2 SINGLE THREADED PORTION
thread_series_designatorUNS SINGLE THREADED PORTION
NSN4820-01-161-0932
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 26M77-100 PIECE 18 · 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: 0.750 INCHES NOMINAL IN
•
THREAD CLASS: 2A SINGLE THREADED PORTION A
•
MATERIAL: NICKEL ALLOY OVERALL
•
STYLE DESIGNATOR: THREADED FLANGED
•
THREAD SERIES DESIGNATOR: UNS SINGLE THREADED PORTION
•
BODY INSIDE DIAMETER: 3.505 INCHES NOMINAL IN
•
SEAT ANGLE IN DEG: 60.000 NOMINAL
•
NOMINAL THREAD SIZE: 4.500 INCHES SINGLE THREADED PORTION IN
TECHNICAL CHARACTERISTICS (FLIS)
FLANGE SEAT TO DISK END HEIGHT0.750 INCHES NOMINAL IN
THREAD CLASS2A SINGLE THREADED PORTION A
MATERIALNICKEL ALLOY OVERALL
STYLE DESIGNATORTHREADED FLANGED
THREAD SERIES DESIGNATORUNS SINGLE THREADED PORTION
BODY INSIDE DIAMETER3.505 INCHES NOMINAL IN
SEAT ANGLE IN DEG60.000 NOMINAL
NOMINAL THREAD SIZE4.500 INCHES SINGLE THREADED PORTION IN
UNDER FLANGE HEIGHT0.875 INCHES NOMINAL IN
FLANGE DIAMETER4.910 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
2620-920X12ASSY11APC4Interchangeable
interchangeable cross-reference
interchangeable
845-2181282-3INInterchangeable
interchangeable cross-reference
interchangeable
845-2445066 ITEM 19Interchangeable
interchangeable cross-reference
interchangeable
26M77-100-PC21Interchangeable
interchangeable cross-reference
interchangeable
845-2445066Interchangeable
interchangeable cross-reference
interchangeable
26M77-100 ITEM 21Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 26M77-100 PIECE 18?
26M77-100 PIECE 18 is a SEAT,VALVE.
What parts can replace 26M77-100 PIECE 18?
There are 19 known substitutes for 26M77-100 PIECE 18: 2620-920X12ASSY11APC4, 845-2181282-3IN, 845-2445066 ITEM 19 and 16 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 26M77-100 PIECE 18?
26M77-100 PIECE 18 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-161-0932. 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