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TB-1277 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

TB-1277: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 316 SEAT, thread_class: 2A SINGLE THREADED PORTION A, flange_diameter: 0.739 INCHES MINIMUM AND 0.748 INCHES MAXIMUM IN, nominal_thread_size: 0.750 INCHES THIRD THREADED PORTION IN, body_inside_diameter: 0.437 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN, seating_surface_shape: ANGULAR. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-286-4526, 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
TB-1277
NSN: 4820-01-286-4526
FSC: 4820 — Valves, Nonpowered
CAGE: 1MEG0 — NATURAL GAS SOLUTIONS NORTH AMERICA LLC DIV INDUSTRIAL PRODUCTS GROUP (USA)
SPECIFICATIONS
materialSTEEL COMP 316 SEAT
thread_class2A SINGLE THREADED PORTION A
flange_diameter0.739 INCHES MINIMUM AND 0.748 INCHES MAXIMUM IN
nominal_thread_size0.750 INCHES THIRD THREADED PORTION IN
body_inside_diameter0.437 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN
seating_surface_shapeANGULAR
thread_quantity_per_inch16 SINGLE THREADED PORTION
NSN4820-01-286-4526
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: TB-1277 · 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 DIAMETER: 0.739 INCHES MINIMUM AND 0.748 INCHES MAXIMUM IN
•
BODY INSIDE DIAMETER: 0.437 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN
•
NOMINAL THREAD SIZE: 0.750 INCHES THIRD THREADED PORTION IN
•
THREAD CLASS: 2A SINGLE THREADED PORTION A
•
THREAD QUANTITY PER INCH: 16 SINGLE THREADED PORTION
•
MATERIAL: STEEL COMP 316 SEAT
•
SEATING SURFACE SHAPE: ANGULAR
TECHNICAL CHARACTERISTICS
FLANGE DIAMETER0.739 INCHES MINIMUM AND 0.748 INCHES MAXIMUM IN
BODY INSIDE DIAMETER0.437 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN
NOMINAL THREAD SIZE0.750 INCHES THIRD THREADED PORTION IN
THREAD CLASS2A SINGLE THREADED PORTION A
THREAD QUANTITY PER INCH16 SINGLE THREADED PORTION
MATERIALSTEEL COMP 316 SEAT
SEATING SURFACE SHAPEANGULAR
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: Semi-active item — no replacement plannedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is TB-1277?
TB-1277 is a SEAT,VALVE.
What is the NSN for TB-1277?
TB-1277 is cataloged in the U.S. Government catalog under NSN 4820-01-286-4526. 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.