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688-0738 — NUT,SELF-LOCKING,EXTENDED WASHER

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

688-0738: NUT,SELF-LOCKING,EXTENDED WASHER.

NUT,SELF-LOCKING,EXTENDED WASHER. Key specifications include nut_style: HEXAGON, thread_series: UN, thread_direction: RIGHT-HAND, nominal_thread_size: 1.750 INCHES IN, end_item_identification: MRAP-MAXXPRO DASH; MRAP - MAXXPRO DASH ISS W/OGPK AND W/CROWS, thread_quantity_per_inch: 12. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-587-4512, 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
688-0738
NSN: 5310-01-587-4512
FSC: 5310 — Nuts and Washers
CAGE: 0B103 — MERITOR SPECIALTY PRODUCTS LLC (USA)
SPECIFICATIONS
nut_styleHEXAGON
thread_seriesUN
thread_directionRIGHT-HAND
nominal_thread_size1.750 INCHES IN
end_item_identificationMRAP-MAXXPRO DASH; MRAP - MAXXPRO DASH ISS W/OGPK AND W/CROWS
thread_quantity_per_inch12
part_name_assigned_by_controlling_agencyNUT, LOCK, HEX, 1-3/4-12
NSN5310-01-587-4512
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 688-0738 · 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 SERIES: UN
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 1.750 INCHES IN
•
NUT STYLE: HEXAGON
•
THREAD QUANTITY PER INCH: 12
TECHNICAL CHARACTERISTICS
THREAD SERIESUN
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE1.750 INCHES IN
PART NAME ASSIGNED BY CONTROLLING AGENCYNUT, LOCK, HEX, 1-3/4-12
NUT STYLEHEXAGON
END ITEM IDENTIFICATIONMRAP-MAXXPRO DASH; MRAP - MAXXPRO DASH ISS W/OGPK AND W/CROWS
THREAD QUANTITY PER INCH12
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
1697345C1Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 688-0738?
688-0738 is a NUT,SELF-LOCKING,EXTENDED WASHER.
What parts can replace 688-0738?
There is 1 known substitute for 688-0738: 1697345C1. Substitute compatibility should be verified for your specific system.
What is the NSN for 688-0738?
688-0738 is cataloged in the U.S. Government catalog under NSN 5310-01-587-4512. 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.