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PartsTable / COMPONENT / A101-12-78
A101-12-78 ✓ 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: 0.266 INCHES NOMINAL IN, thread_class: 2B, thread_series: UNF, thread_direction: RIGHT-HAND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-148-8809, 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
A101-12-78
NSN: 5310-00-148-8809
FSC: 5310
CAGE: 81361 — EDGEWOOD CHEMICAL BIOLOGICAL CENTER ECBC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
nut_height0.266 INCHES NOMINAL IN
thread_class2B
thread_seriesUNF
thread_directionRIGHT-HAND
width_across_flats0.438 INCHES NOMINAL IN
nominal_thread_size0.312 INCHES IN
bearing_surface_typeFLAT OR CHAMFERED
thread_quantity_per_inch24
NSN5310-00-148-8809
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: A101-12-78 · 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-HAND
•
NUT HEIGHT: 0.266 INCHES NOMINAL IN
•
NOMINAL THREAD SIZE: 0.312 INCHES IN
•
THREAD SERIES: UNF
•
THREAD QUANTITY PER INCH: 24
•
BEARING SURFACE TYPE: FLAT OR CHAMFERED
•
NUT STYLE: HEXAGON
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
NUT HEIGHT0.266 INCHES NOMINAL IN
NOMINAL THREAD SIZE0.312 INCHES IN
THREAD SERIESUNF
THREAD QUANTITY PER INCH24
BEARING SURFACE TYPEFLAT OR CHAMFERED
NUT STYLEHEXAGON
MATERIALSTEEL OVERALL
THREAD CLASS2B
WIDTH ACROSS FLATS0.438 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
25412Interchangeable
interchangeable cross-reference
interchangeable
MS35387-2Interchangeable
interchangeable cross-reference
interchangeable
506102Interchangeable
interchangeable cross-reference
interchangeable
40618AInterchangeable
interchangeable cross-reference
interchangeable
S209Interchangeable
interchangeable cross-reference
interchangeable
23055Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A101-12-78?
A101-12-78 is a NUT,PLAIN,HEXAGON.
What parts can replace A101-12-78?
There are 11 known substitutes for A101-12-78: 25412, MS35387-2, 506102 and 8 more. Substitute compatibility should be verified for your specific system.
Is A101-12-78 still available?
A101-12-78 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026