PartsTable
Technical Data Sheet
77AX9 ✓ 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: HEXAGON, nut_height: 0.117 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN, thread_class: 3B, thread_series: UNF, hardness_rating: 78.0 ROCKWELL B NOMINAL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-042-6903, 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
77AX9
NSN: 5310-00-042-6903
FSC: 5310
CAGE: 76040 — MACK TRUCKS INC PARTS OPN (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
nut_height0.117 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN
thread_class3B
thread_seriesUNF
hardness_rating78.0 ROCKWELL B NOMINAL
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OR ZINC OVERALL
width_across_flats0.3620 INCHES MINIMUM AND 0.3750 INCHES MAXIMUM IN
nominal_thread_size0.190 INCHES IN
bearing_surface_typeCHAMFERED OR WASHER FACED
thread_quantity_per_inch32
NSN5310-00-042-6903
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 77AX9 · 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
BEARING SURFACE TYPE: CHAMFERED OR WASHER FACED
HARDNESS RATING: 78.0 ROCKWELL B NOMINAL
THREAD QUANTITY PER INCH: 32
THREAD SERIES: UNF
NOMINAL THREAD SIZE: 0.190 INCHES IN
MATERIAL: STEEL OVERALL
SURFACE TREATMENT: CADMIUM OR ZINC OVERALL
WIDTH ACROSS FLATS: 0.3620 INCHES MINIMUM AND 0.3750 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
BEARING SURFACE TYPECHAMFERED OR WASHER FACED
HARDNESS RATING78.0 ROCKWELL B NOMINAL
THREAD QUANTITY PER INCH32
THREAD SERIESUNF
NOMINAL THREAD SIZE0.190 INCHES IN
MATERIALSTEEL OVERALL
SURFACE TREATMENTCADMIUM OR ZINC OVERALL
WIDTH ACROSS FLATS0.3620 INCHES MINIMUM AND 0.3750 INCHES MAXIMUM IN
NONDEFINITIVE SPEC/STD DATAA TYPE
NUT STYLEHEXAGON
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
LS1198Interchangeable
interchangeable cross-reference
interchangeable
CVC1638Interchangeable
interchangeable cross-reference
interchangeable
AMS-QQ-A-200/3Interchangeable
interchangeable cross-reference
interchangeable
ASTM B221Interchangeable
interchangeable cross-reference
interchangeable
10854Interchangeable
interchangeable cross-reference
interchangeable
AMS-QQ-A-200/9Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 77AX9?
77AX9 is a NUT,PLAIN,HEXAGON.
What parts can replace 77AX9?
There are 20 known substitutes for 77AX9: LS1198, CVC1638, AMS-QQ-A-200/3 and 17 more. Substitute compatibility should be verified for your specific system.
Is 77AX9 still available?
77AX9 is currently cancelled.
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