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0740688 — Technical Data Sheet

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— · 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,SELF-LOCKING,HEXAGON is a the manufacturer industrial component. Key specifications include material: PLASTIC POLYHEXAMETHYLENE AMIDE LOCKING INSERT, nut_style: HEXAGON, nut_height: 0.240 INCHES MINIMUM AND 0.360 INCHES MAXIMUM IN, temp_rating: 250.0 FAHRENHEIT NOMINAL DEGF, thread_class: 3B, thread_series: UNIFIED NATIONAL COARSE (UNC). This part is cataloged in the Federal Logistics Information System under NSN 5310-00-241-6604, 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
0740688
NSN: 5310-00-241-6604
FSC: 5310
CAGE: S3002 — GENERAL DYNAMICS EUROPEAN, LAND-SYSTEMS-MOWAG GMBH DBA GDELS (CHE)
SPECIFICATIONS
materialPLASTIC POLYHEXAMETHYLENE AMIDE LOCKING INSERT
nut_styleHEXAGON
nut_height0.240 INCHES MINIMUM AND 0.360 INCHES MAXIMUM IN
temp_rating250.0 FAHRENHEIT NOMINAL DEGF
thread_class3B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
locking_featurePREVAILING TORQUE WITH NONMETALLIC INSERT
thread_directionRIGHT-HAND
countersink_angle88.0 DEGREES NOMINAL NUT
surface_treatmentPASSIVATE NUT
width_across_flats0.428 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN
nominal_thread_size0.250 INCHES IN
NSN5310-00-241-6604
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 0740688 · 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
•
MATERIAL: PLASTIC POLYHEXAMETHYLENE AMIDE LOCKING INSERT
•
NUT HEIGHT: 0.240 INCHES MINIMUM AND 0.360 INCHES MAXIMUM IN
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
WIDTH ACROSS FLATS: 0.428 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN
•
THREAD QUANTITY PER INCH: 20
•
TEMP RATING: 250.0 FAHRENHEIT NOMINAL DEGF
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
TECHNICAL CHARACTERISTICS
MATERIALPLASTIC POLYHEXAMETHYLENE AMIDE LOCKING INSERT
NUT HEIGHT0.240 INCHES MINIMUM AND 0.360 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
WIDTH ACROSS FLATS0.428 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH20
TEMP RATING250.0 FAHRENHEIT NOMINAL DEGF
NOMINAL THREAD SIZE0.250 INCHES IN
END ITEM IDENTIFICATIONA4 BRADLEY FIGHTING VEHICLE; A3 BRADLEY FIGHTING VEHICLE; LOGISTICS SUPPORT VESSEL
BEARING SURFACE FINISH125.0 MICROINCHES
VERIFIED SUBSTITUTES & CROSS-REFERENCES 24
0731963InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
MS17830-4CInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
79NM4-40InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
R-899 PIECE 13InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
F188InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
MS-17830-4C CRE S 316InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLEDGOVERNMENT REGISTRY
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 0740688?
0740688 is a NUT,SELF-LOCKING,HEXAGON.
What parts can replace 0740688?
There are 24 known substitutes for 0740688: 0731963, MS17830-4C, 79NM4-40 and 21 more. Substitute compatibility should be verified for your specific system.
Is 0740688 still available?
0740688 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: October 2026