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491989 — SWITCH,ROTARY

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

491989: SWITCH,ROTARY.

The SWITCH,ROTARY is a the manufacturer industrial component. Key specifications include length: 1.075 INCHES MINIMUM AND 1.095 INCHES MAXIMUM IN, material: STEEL CORROSION RESISTING, thread_class: 3A A, thread_length: 0.320 INCHES MINIMUM AND 0.356 INCHES MAXIMUM IN, inside_diameter: 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN, vent_hole_shape: ROUND. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-915-9656, 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
491989
NSN: 5340-00-915-9656
NIINs: 009159656, 015951381
FSC: 5340 — Hardware, Commercial
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
length1.075 INCHES MINIMUM AND 1.095 INCHES MAXIMUM IN
materialSTEEL CORROSION RESISTING
thread_class3A A
thread_length0.320 INCHES MINIMUM AND 0.356 INCHES MAXIMUM IN
inside_diameter0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN
vent_hole_shapeROUND
outside_diameter0.990 INCHES MINIMUM AND 1.130 INCHES MAXIMUM IN
vent_hole_diameter0.060 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN
vent_hole_quantity6
end_connection_typeTHREADED
fsc_application_dataCONTROL ASSY,PRESSURE RATIO BLEED,ACFT ENGINE,2995001398687 743548
thread_size_and_series/type_designator0.750-16 UNF
NSN5340-00-915-9656
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 491989 MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
FSC APPLICATION DATA: CONTROL ASSY,PRESSURE RATIO BLEED,ACFT ENGINE,2995001398687 743548
•
VENT HOLE DIAMETER: 0.060 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN
•
LENGTH: 1.075 INCHES MINIMUM AND 1.095 INCHES MAXIMUM IN
•
VENT HOLE SHAPE: ROUND
•
THREAD LENGTH: 0.320 INCHES MINIMUM AND 0.356 INCHES MAXIMUM IN
•
END CONNECTION TYPE: THREADED
•
OUTSIDE DIAMETER: 0.990 INCHES MINIMUM AND 1.130 INCHES MAXIMUM IN
•
INSIDE DIAMETER: 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
FSC APPLICATION DATACONTROL ASSY,PRESSURE RATIO BLEED,ACFT ENGINE,2995001398687 743548
VENT HOLE DIAMETER0.060 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN
LENGTH1.075 INCHES MINIMUM AND 1.095 INCHES MAXIMUM IN
VENT HOLE SHAPEROUND
THREAD LENGTH0.320 INCHES MINIMUM AND 0.356 INCHES MAXIMUM IN
END CONNECTION TYPETHREADED
OUTSIDE DIAMETER0.990 INCHES MINIMUM AND 1.130 INCHES MAXIMUM IN
INSIDE DIAMETER0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN
THREAD CLASS3A A
MATERIALSTEEL CORROSION RESISTING
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 491989?
491989 is a SWITCH,ROTARY.
What is the NSN for 491989?
491989 is cataloged in the U.S. Government catalog under NSN 5340-00-915-9656. 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.