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99-889 — FLYWHEEL,ENGINE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

99-889: FLYWHEEL,ENGINE.

The FLYWHEEL,ENGINE is a the manufacturer industrial component. Key specifications include flow_control_device: DISK, valve_operation_method: AUTOMATIC, media_for_which_designed: OIL, HYDRAULIC SINGLE RESPONSE. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-208-3299, 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
99-889
NSN: 5310-00-208-3299
NIINs: 002083299, 005035775, 005144905, 008676714, 011836013, 013773087
FSC: 5310 — Nuts and Washers
CAGE: 93232 — CURTISS-WRIGHT ELECTRO-MECHANICAL CORPORATION DBA CURTISS WRIGHT ENGINEERED PUMP DIVISION USE CAGE CODE 0UBG9 FOR CATALOGING (USA)
SPECIFICATIONS
flow_control_deviceDISK
valve_operation_methodAUTOMATIC
media_for_which_designedOIL, HYDRAULIC SINGLE RESPONSE
NSN5310-00-208-3299
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 99-889 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
THREAD SERIES: UNF
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: RIGHT-HAND
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NOMINAL THREAD SIZE: 0.625 INCHES IN
•
NUT DIAMETER: 1.875 INCHES NOMINAL IN
•
NUT THICKNESS: 0.375 INCHES NOMINAL IN
•
DRIVE POINT DIAMETER: 0.250 INCHES NOMINAL IN
•
DRIVE POINT QUANTITY: 2
TECHNICAL CHARACTERISTICS
THREAD SERIESUNF
MATERIAL DOCUMENT AND CLASSIFICATIONSAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.625 INCHES IN
NUT DIAMETER1.875 INCHES NOMINAL IN
NUT THICKNESS0.375 INCHES NOMINAL IN
DRIVE POINT DIAMETER0.250 INCHES NOMINAL IN
DRIVE POINT QUANTITY2
NUT STYLEROUND
THREAD CLASS3B
SUBSTITUTES & CROSS-REFERENCES 5
635-416-34Reference document
Same NSN cross-reference
Reference document — Secondary reference
RX63233PC34Reference document
Same NSN cross-reference
Reference document — Secondary reference
5031PReference document
Same NSN cross-reference
Reference document — Secondary reference
SL6276PC34Reference document
Same NSN cross-reference
Reference document — Secondary reference
SL6435PC34Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 99-889?
99-889 is a FLYWHEEL,ENGINE.
What parts can replace 99-889?
There are 5 known substitutes for 99-889: 635-416-34, RX63233PC34, 5031P and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 99-889?
99-889 is cataloged in the U.S. Government catalog under NSN 5310-00-208-3299. 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.