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642871C91 — GENERATOR,ENGINE ACCESSORY

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

642871C91: GENERATOR,ENGINE ACCESSORY.

The GENERATOR,ENGINE ACCESSORY is a the manufacturer industrial component. Key specifications include bonnet_type: INSIDE SPRING, connection_type: THREADED INTERNAL PIPE ALL ENDS, connection_style: PLAIN,OPTIONAL END(PIPE) ALL ENDS, style_designator: CROSS, thread_direction: RIGHT-HAND ALL ENDS, flow_control_device: STEM. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-245-7886, 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
642871C91
NSN: 4820-00-245-7886
FSC: 4820 — Valves, Nonpowered
CAGE: 29510 — KOMATSU AMERICAN INTL CO (USA)
SPECIFICATIONS
bonnet_typeINSIDE SPRING
connection_typeTHREADED INTERNAL PIPE ALL ENDS
connection_stylePLAIN,OPTIONAL END(PIPE) ALL ENDS
style_designatorCROSS
thread_directionRIGHT-HAND ALL ENDS
flow_control_deviceSTEM
nominal_thread_size0.250 INCHES ALL ENDS IN
valve_operation_methodMANUAL
bonnet_attachment_methodBOLTED
renewable_seat_ring_typeTHREADED
thread_series_designatorNPT ALL ENDS
NSN4820-00-245-7886
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 642871C91 · 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
•
FLOW CONTROL DEVICE: STEM
•
RENEWABLE SEAT RING TYPE: THREADED
•
CONNECTION STYLE: PLAIN,OPTIONAL END(PIPE) ALL ENDS
•
CONNECTION TYPE: THREADED INTERNAL PIPE ALL ENDS
•
STYLE DESIGNATOR: CROSS
•
BONNET TYPE: INSIDE SPRING
•
THREAD DIRECTION: RIGHT-HAND ALL ENDS
•
NOMINAL THREAD SIZE: 0.250 INCHES ALL ENDS IN
TECHNICAL CHARACTERISTICS
FLOW CONTROL DEVICESTEM
RENEWABLE SEAT RING TYPETHREADED
CONNECTION STYLEPLAIN,OPTIONAL END(PIPE) ALL ENDS
CONNECTION TYPETHREADED INTERNAL PIPE ALL ENDS
STYLE DESIGNATORCROSS
BONNET TYPEINSIDE SPRING
THREAD DIRECTIONRIGHT-HAND ALL ENDS
NOMINAL THREAD SIZE0.250 INCHES ALL ENDS IN
BONNET ATTACHMENT METHODBOLTED
THREAD SERIES DESIGNATORNPT ALL ENDS
SUBSTITUTES & CROSS-REFERENCES 2
WM331CReference document
Same NSN cross-reference
Reference document — Secondary reference
110227Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
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 642871C91?
642871C91 is a GENERATOR,ENGINE ACCESSORY.
What parts can replace 642871C91?
There are 2 known substitutes for 642871C91: WM331C, 110227. Substitute compatibility should be verified for your specific system.
What is the NSN for 642871C91?
642871C91 is cataloged in the U.S. Government catalog under NSN 4820-00-245-7886. 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.