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551AAW — TACHOMETER,MECHANICAL,FIXED MOUN

✓ Government record, cited
STEWART-WARNER CORPORATION · COMPONENT
PRODUCT OVERVIEW

551AAW: TACHOMETER,MECHANICAL,FIXED MOUN.

TACHOMETER,MECHANICAL,FIXED MOUN. Key specifications include CASE SHAPE: ROUND, MOUNTING TYPE: PANEL, POINTER COLOR: BLACK AND WHITE, GRADUATION UNIT: 0.1 HOUR, OPERATING RANGE: +0.0 TO 3000.0 REVOLUTIONS PER MINUTE, OVERALL DIAMETER: 3.570 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 6680-00-538-0899, 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
551AAW
NSN: 6680-00-538-0899
FSC: 6680 — Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments
CAGE: 57733 — STEWART-WARNER CORPORATION (USA)
SPECIFICATIONS
CASE SHAPEROUND
DIAL QUANTITY1
MOUNTING TYPEPANEL
POINTER COLORBLACK AND WHITE
SCALE QUANTITY1
GRADUATION UNIT0.1 HOUR
OPERATING RANGE+0.0 TO 3000.0 REVOLUTIONS PER MINUTE
OVERALL DIAMETER3.570 INCHES NOMINAL IN
POINTER QUANTITY1
DIAL ILLUMINATIONNOT PROVIDED
TOTALIZING MECHANISMPROVIDED
DIAL BACKGROUND COLORBLACK
NSN6680-00-538-0899
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR MFR: STEWART-WARNER CORPORATION TACHOMETER,MECHANICAL,FIXED MOUN TITLE COMPONENT PN 551AAW MFR STEWART-WARNER CORPORATION TACHOMETER,MECHANICAL,
KEY FEATURES
•
SCALE QUANTITY: 1
•
MAJOR GRADUATION COLOR: WHITE
•
OVERALL DIAMETER: 3.570 INCHES NOMINAL IN
•
DIAL ILLUMINATION: NOT PROVIDED
•
DRIVE CONNECTION TYPE: SQUARE
•
SCALE SMALLEST INCREMENT: 100.0 REVOLUTIONS PER MINUTE
•
DIAL QUANTITY: 1
•
TOTALIZING MECHANISM: PROVIDED
TECHNICAL CHARACTERISTICS
SCALE QUANTITY1
MAJOR GRADUATION COLORWHITE
OVERALL DIAMETER3.570 INCHES NOMINAL IN
DIAL ILLUMINATIONNOT PROVIDED
DRIVE CONNECTION TYPESQUARE
SCALE SMALLEST INCREMENT100.0 REVOLUTIONS PER MINUTE
DIAL QUANTITY1
TOTALIZING MECHANISMPROVIDED
SCALE MEASUREMENT UNITREVOLUTIONS PER MINUTE
POINTER QUANTITY1
OTHER ITEMS IN FSC 6680 — Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
6680-00-000-0189 6680-00-001-1478 6680-00-001-1502 6680-00-001-1506 6680-00-001-1511 6680-00-001-3672 6680-00-001-3675 6680-00-001-4170
SUBSTITUTES & CROSS-REFERENCES 2
551Reference document
Same NSN cross-reference
Reference document — Secondary reference
A39806Reference 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 551AAW?
551AAW is a TACHOMETER,MECHANICAL,FIXED MOUN manufactured by STEWART-WARNER CORPORATION.
What parts can replace 551AAW?
There are 2 known substitutes for 551AAW: 551, A39806. Substitute compatibility should be verified for your specific system.
What is the NSN for 551AAW?
551AAW is cataloged in the U.S. Government catalog under NSN 6680-00-538-0899. 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.