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78686-12 — NUT,SELF-LOCKING,ROUND

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

78686-12: NUT,SELF-LOCKING,ROUND.

The NUT,SELF-LOCKING,ROUND is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY 718 OVERALL, lubrication: DRY FILM LUBRICANT, nut_diameter: 1.296 INCHES MAXIMUM IN, thread_class: 3B, nut_thickness: 0.750 INCHES MAXIMUM IN, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF). This part is cataloged in the U.S.

Government catalog under NSN 5310-01-132-3398, 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
78686-12
NSN: 5310-01-132-3398
FSC: 5310 — Nuts and Washers
CAGE: 56878 — SPS TECHNOLOGIES, LLC DBA PB FASTENERS (USA)
SPECIFICATIONS
materialNICKEL ALLOY 718 OVERALL
lubricationDRY FILM LUBRICANT
nut_diameter1.296 INCHES MAXIMUM IN
thread_class3B
nut_thickness0.750 INCHES MAXIMUM IN
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
locking_featurePREVAILING TORQUE ALL METAL DESIGN
thread_directionRIGHT-HAND
drive_point_depth0.071 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
drive_point_width0.043 INCHES MINIMUM AND 0.050 INCHES MAXIMUM IN
surface_treatmentCOPPER AND NICKEL THREADS
nominal_thread_size0.750 INCHES IN
NSN5310-01-132-3398
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 78686-12 · 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
•
LUBRICATION: DRY FILM LUBRICANT
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5663 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
DRIVE POINT WIDTH: 0.043 INCHES MINIMUM AND 0.050 INCHES MAXIMUM IN
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.750 INCHES IN
•
NUT DIAMETER: 1.296 INCHES MAXIMUM IN
•
DRIVE POINT DEPTH: 0.071 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
LUBRICATIONDRY FILM LUBRICANT
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5663 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
DRIVE POINT WIDTH0.043 INCHES MINIMUM AND 0.050 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.750 INCHES IN
NUT DIAMETER1.296 INCHES MAXIMUM IN
DRIVE POINT DEPTH0.071 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN
LOCKING FEATUREPREVAILING TORQUE ALL METAL DESIGN
NUT THICKNESS0.750 INCHES MAXIMUM IN
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
SUBSTITUTES & CROSS-REFERENCES 4
SLN187-12Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LH12038-12Reference document
Same NSN cross-reference
Reference document — Secondary reference
10109639Reference document
Same NSN cross-reference
Reference document — Informative reference only
ST3M752-12Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 78686-12?
78686-12 is a NUT,SELF-LOCKING,ROUND.
What parts can replace 78686-12?
There are 4 known substitutes for 78686-12: SLN187-12, LH12038-12, 10109639 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 78686-12?
78686-12 is cataloged in the U.S. Government catalog under NSN 5310-01-132-3398. 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.