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188616 — HEATER,AIRCRAFT ENGINE MAINTENAN

✓ Government record, cited
Motorola · NUT WASHER
PRODUCT OVERVIEW

188616: HEATER,AIRCRAFT ENGINE MAINTENAN.

HEATER,AIRCRAFT ENGINE MAINTENAN. Key specifications include special_features: HEATER-NO2 BEARING SUPPORT, TOWER SHAFT ROLLER BEARING L.R. OPENING; SUPERCEDED BY PWA57400 -229 ENGINE, end_item_identification: F100-PW-100/200 ENGINE, reference_data_and_literature: T.O.

2J-F100-94; SERD NO. 1414, part_name_assigned_by_controlling_agency: HEATER,CASE,COMPRES. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-616-3777, 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
188616
NSN: 5310-00-616-3777
NIINs: 006163777, 008958193, 015948026
FSC: 5310 — Nuts and Washers
CAGE: 66503 — WOODWARD, INC. DIV FUEL SYSTEMS AND CONTROLS (USA)
SPECIFICATIONS
special_featuresHEATER-NO2 BEARING SUPPORT, TOWER SHAFT ROLLER BEARING L.R. OPENING; SUPERCEDED BY PWA57400 -229 ENGINE
end_item_identificationF100-PW-100/200 ENGINE
reference_data_and_literatureT.O. 2J-F100-94; SERD NO. 1414
part_name_assigned_by_controlling_agencyHEATER,CASE,COMPRES
NSN5310-00-616-3777
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 188616 · Motorola ⚠ 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
•
WIDTH ACROSS FLATS: 0.375 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
HARDNESS RATING: 103.0 BRINELL STANDARD MINIMUM
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.190 INCHES IN
•
NONDEFINITIVE SPEC/STD DATA: 2 TYPE AND 13 STYLE
•
NUT HEIGHT: 0.125 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.375 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
HARDNESS RATING103.0 BRINELL STANDARD MINIMUM
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.190 INCHES IN
NONDEFINITIVE SPEC/STD DATA2 TYPE AND 13 STYLE
NUT HEIGHT0.125 INCHES NOMINAL IN
SURFACE TREATMENTCADMIUM OVERALL
NUT STYLEHEXAGON
SUBSTITUTES & CROSS-REFERENCES 1
FFN836Reference document
Same NSN cross-reference
Reference document — Identification reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 188616?
188616 is a HEATER,AIRCRAFT ENGINE MAINTENAN manufactured by Motorola.
What parts can replace 188616?
There is 1 known substitute for 188616: FFN836. Substitute compatibility should be verified for your specific system.
What is the NSN for 188616?
188616 is cataloged in the U.S. Government catalog under NSN 5310-00-616-3777. 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.