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70948-524 — NUT,SELF-LOCKING,EXTENDED WASHER

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

70948-524: NUT,SELF-LOCKING,EXTENDED WASHER.

NUT,SELF-LOCKING,EXTENDED WASHER. Key specifications include material: IRON ALLOY 660 OVERALL, nut_style: DOUBLE HEXAGON, lubrication: DRY FILM LUBRICANT, thread_class: 3BG, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF), overall_height: 0.300 INCHES MINIMUM AND 0.336 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-173-7578, 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
70948-524
NSN: 5310-00-173-7578
FSC: 5310 — Nuts and Washers
CAGE: 56878 — SPS TECHNOLOGIES, LLC DBA PB FASTENERS (USA)
SPECIFICATIONS
materialIRON ALLOY 660 OVERALL
nut_styleDOUBLE HEXAGON
lubricationDRY FILM LUBRICANT
thread_class3BG
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
overall_height0.300 INCHES MINIMUM AND 0.336 INCHES MAXIMUM IN
locking_featurePREVAILING TORQUE ALL METAL DESIGN
thread_directionRIGHT-HAND
washer_thickness0.043 INCHES NOMINAL IN
width_across_flats0.367 INCHES MINIMUM AND 0.376 INCHES MAXIMUM IN
nominal_thread_size0.312 INCHES IN
washer_outside_diameter0.470 INCHES MINIMUM AND 0.490 INCHES MAXIMUM IN
NSN5310-00-173-7578
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 70948-524 · 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
•
WASHER OUTSIDE DIAMETER: 0.470 INCHES MINIMUM AND 0.490 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 0.367 INCHES MINIMUM AND 0.376 INCHES MAXIMUM IN
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
WASHER THICKNESS: 0.043 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5735 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
LUBRICATIONDRY FILM LUBRICANT
OVERALL HEIGHT0.300 INCHES MINIMUM AND 0.336 INCHES MAXIMUM IN
WASHER OUTSIDE DIAMETER0.470 INCHES MINIMUM AND 0.490 INCHES MAXIMUM IN
WIDTH ACROSS FLATS0.367 INCHES MINIMUM AND 0.376 INCHES MAXIMUM IN
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
WASHER THICKNESS0.043 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5735 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.312 INCHES IN
LOCKING FEATUREPREVAILING TORQUE ALL METAL DESIGN
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 1
4020T72P01Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 70948-524?
70948-524 is a NUT,SELF-LOCKING,EXTENDED WASHER.
What parts can replace 70948-524?
There is 1 known substitute for 70948-524: 4020T72P01. Substitute compatibility should be verified for your specific system.
What is the NSN for 70948-524?
70948-524 is cataloged in the U.S. Government catalog under NSN 5310-00-173-7578. 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.