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42C74 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

42C74: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thread_class: 3A SINGLE THREADED PORTION A, thread_length: 0.045 INCHES NOMINAL SINGLE THREADED PORTION IN, flange_diameter: 0.250 INCHES NOMINAL IN, style_designator: FAUCET, surface_treatment: PASSIVATE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-677-5674, 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
42C74
NSN: 4820-00-677-5674
FSC: 4820 — Valves, Nonpowered
CAGE: 59364 — HONEYWELL INTERNATIONAL INC. DBA HONEYWELL INTERNATIONAL DIV AEROSPACE - TEMPE (WEST WARNER ROAD) (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thread_class3A SINGLE THREADED PORTION A
thread_length0.045 INCHES NOMINAL SINGLE THREADED PORTION IN
flange_diameter0.250 INCHES NOMINAL IN
style_designatorFAUCET
surface_treatmentPASSIVATE OVERALL
nominal_thread_size0.312 INCHES SINGLE THREADED PORTION IN
under_flange_height0.140 INCHES NOMINAL IN
body_inside_diameter0.093 INCHES NOMINAL IN
seating_surface_shapeFLAT
thread_series_designatorUNF SINGLE THREADED PORTION
flange_seat_to_disk_end_height0.140 INCHES NOMINAL IN
NSN4820-00-677-5674
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 42C74 · 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: 0.140 INCHES NOMINAL IN
•
FLANGE DIAMETER: 0.250 INCHES NOMINAL IN
•
THREAD LENGTH: 0.045 INCHES NOMINAL SINGLE THREADED PORTION IN
•
STYLE DESIGNATOR: FAUCET
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-7720,COMP 302,COND G MIL SPEC ALL MATERIAL RESPONSES OVERALL
•
BODY INSIDE DIAMETER: 0.093 INCHES NOMINAL IN
•
NOMINAL THREAD SIZE: 0.312 INCHES SINGLE THREADED PORTION IN
•
SURFACE TREATMENT: PASSIVATE OVERALL
TECHNICAL CHARACTERISTICS
FLANGE SEAT TO DISK END HEIGHT0.140 INCHES NOMINAL IN
FLANGE DIAMETER0.250 INCHES NOMINAL IN
THREAD LENGTH0.045 INCHES NOMINAL SINGLE THREADED PORTION IN
STYLE DESIGNATORFAUCET
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-7720,COMP 302,COND G MIL SPEC ALL MATERIAL RESPONSES OVERALL
BODY INSIDE DIAMETER0.093 INCHES NOMINAL IN
NOMINAL THREAD SIZE0.312 INCHES SINGLE THREADED PORTION IN
SURFACE TREATMENTPASSIVATE OVERALL
UNDER FLANGE HEIGHT0.140 INCHES NOMINAL IN
THREAD CLASS3A SINGLE THREADED PORTION A
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: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 42C74?
42C74 is a SEAT,VALVE.
What is the NSN for 42C74?
42C74 is cataloged in the U.S. Government catalog under NSN 4820-00-677-5674. 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.