PartsTable
Technical Data Sheet
90591A161 ✓ Verified by PartsTable
· NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The NUT,PLAIN,HEXAGON is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: HEXAGONHEXAGON, nut_height: 6.5 MILLIMETERS NOMINAL6.5 MILLIMETERS NOMINAL MM, thread_series: ISO MISO M, thread_direction: RIGHT-HANDRIGHT-HAND, surface_treatment: ZINC AND ZINC AND DICHROMATE OVERALLDICHROMATE OVERALL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-137-4829, 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
90591A161
NSN: 5310-01-137-4829
FSC: 5310
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGONHEXAGON
nut_height6.5 MILLIMETERS NOMINAL6.5 MILLIMETERS NOMINAL MM
thread_seriesISO MISO M
thread_directionRIGHT-HANDRIGHT-HAND
surface_treatmentZINC AND ZINC AND DICHROMATE OVERALLDICHROMATE OVERALL
width_across_flats13.0 MILLIMETERS NOMINAL13.0 MILLIMETERS NOMINAL MM
nominal_thread_size8.0 MILLIMETERS8.0 MILLIMETERS MM
bearing_surface_typeFLATFLAT
thread_tolerance_class6H INTERNAL6H INTERNAL
end_item_identificationMRAP - COUGARMRAP - COUGAR
thread_pitch_in_millimeters1.251.25
NSN5310-01-137-4829
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 90591A161 · 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 DIRECTION: RIGHT-HANDRIGHT-HAND
NUT STYLE: HEXAGONHEXAGON
BEARING SURFACE TYPE: FLATFLAT
WIDTH ACROSS FLATS: 13.0 MILLIMETERS NOMINAL13.0 MILLIMETERS NOMINAL MM
THREAD PITCH IN MILLIMETERS: 1.251.25
THREAD TOLERANCE CLASS: 6H INTERNAL6H INTERNAL
THREAD SERIES: ISO MISO M
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HANDRIGHT-HAND
NUT STYLEHEXAGONHEXAGON
BEARING SURFACE TYPEFLATFLAT
WIDTH ACROSS FLATS13.0 MILLIMETERS NOMINAL13.0 MILLIMETERS NOMINAL MM
END ITEM IDENTIFICATIONMRAP - COUGARMRAP - COUGAR
THREAD PITCH IN MILLIMETERS1.251.25
THREAD TOLERANCE CLASS6H INTERNAL6H INTERNAL
THREAD SERIESISO MISO M
NOMINAL THREAD SIZE8.0 MILLIMETERS8.0 MILLIMETERS MM
SURFACE TREATMENTZINC AND ZINC AND DICHROMATE OVERALLDICHROMATE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
10573Interchangeable
interchangeable cross-reference
interchangeable
GS570CP0573Interchangeable
interchangeable cross-reference
interchangeable
A0573Interchangeable
interchangeable cross-reference
interchangeable
430008Interchangeable
interchangeable cross-reference
interchangeable
C551-10573Interchangeable
interchangeable cross-reference
interchangeable
MARVEL MYSTERY OIL 1 QTInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 90591A161?
90591A161 is a NUT,PLAIN,HEXAGON.
What parts can replace 90591A161?
There are 12 known substitutes for 90591A161: 10573, GS570CP0573, A0573 and 9 more. Substitute compatibility should be verified for your specific system.
Is 90591A161 still available?
90591A161 is currently cancelled.
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