PartsTable
Technical Data Sheet
991 2665 ✓ 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 PROPERTY CLASS 8.8 OVERALL, nut_style: HEXAGONHEXAGON, nut_height: 4.0 MILLIMETERS NOMINAL4.0 MILLIMETERS NOMINAL MM, thread_series: ISO MISO M, thread_direction: RIGHT-HANDRIGHT-HAND, surface_treatment: DICHROMATE OVERALLDICHROMATE OVERALL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-137-2200, 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
991 2665
NSN: 5310-01-137-2200
FSC: 5310
CAGE: 34914 — HIAB USA INC (USA)
SPECIFICATIONS
materialSTEEL PROPERTY CLASS 8.8 OVERALL
nut_styleHEXAGONHEXAGON
nut_height4.0 MILLIMETERS NOMINAL4.0 MILLIMETERS NOMINAL MM
thread_seriesISO MISO M
thread_directionRIGHT-HANDRIGHT-HAND
surface_treatmentDICHROMATE OVERALLDICHROMATE OVERALL
width_across_flats8.0 MILLIMETERS NOMINAL8.0 MILLIMETERS NOMINAL MM
nominal_thread_size5.0 MILLIMETERS5.0 MILLIMETERS MM
bearing_surface_typeCHAMFERED OR CHAMFERED OR WASHER FACEDWASHER FACED
thread_tolerance_class6H INTERNAL6H INTERNAL
thread_pitch_in_millimeters0.800.80
NSN5310-01-137-2200
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 991 2665 · 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
NUT HEIGHT: 4.0 MILLIMETERS NOMINAL4.0 MILLIMETERS NOMINAL MM
THREAD SERIES: ISO MISO M
BEARING SURFACE TYPE: CHAMFERED OR CHAMFERED OR WASHER FACEDWASHER FACED
NOMINAL THREAD SIZE: 5.0 MILLIMETERS5.0 MILLIMETERS MM
THREAD TOLERANCE CLASS: 6H INTERNAL6H INTERNAL
THREAD PITCH IN MILLIMETERS: 0.800.80
THREAD DIRECTION: RIGHT-HANDRIGHT-HAND
MATERIAL: STEEL PROPERTY CLASS 8.8 OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
NUT HEIGHT4.0 MILLIMETERS NOMINAL4.0 MILLIMETERS NOMINAL MM
THREAD SERIESISO MISO M
BEARING SURFACE TYPECHAMFERED OR CHAMFERED OR WASHER FACEDWASHER FACED
NOMINAL THREAD SIZE5.0 MILLIMETERS5.0 MILLIMETERS MM
THREAD TOLERANCE CLASS6H INTERNAL6H INTERNAL
THREAD PITCH IN MILLIMETERS0.800.80
THREAD DIRECTIONRIGHT-HANDRIGHT-HAND
MATERIALSTEEL PROPERTY CLASS 8.8 OVERALL
WIDTH ACROSS FLATS8.0 MILLIMETERS NOMINAL8.0 MILLIMETERS NOMINAL MM
NUT STYLEHEXAGONHEXAGON
VERIFIED SUBSTITUTES & CROSS-REFERENCES 28
2984Interchangeable
interchangeable cross-reference
interchangeable
927018Interchangeable
interchangeable cross-reference
interchangeable
R6774Interchangeable
interchangeable cross-reference
interchangeable
830091Interchangeable
interchangeable cross-reference
interchangeable
11076Interchangeable
interchangeable cross-reference
interchangeable
113-3Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 991 2665?
991 2665 is a NUT,PLAIN,HEXAGON.
What parts can replace 991 2665?
There are 28 known substitutes for 991 2665: 2984, 927018, R6774 and 25 more. Substitute compatibility should be verified for your specific system.
Is 991 2665 still available?
991 2665 is currently cancelled.
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