PartsTable
Technical Data Sheet
27326R1 ✓ 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 WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, surface_treatment: PHOSPHATE OVERALL, peripheral_shape_style: ROUND, center_hole_shape_style: ROUND, end_item_identification: MRAP - COMMON NSN - USED ON MAXXPRO CAT I AND 1 OTHER WEAPON SYSTEM, cross-sectional_shape_style: RECTANGULAR. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-244-8937, 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
27326R1
NSN: 5310-01-244-8937
FSC: 5310
CAGE: 89346 — NAVISTAR INTL CORP TRUCK BR OHIO PLANT (USA)
SPECIFICATIONS
materialSTEEL OVERALL
surface_treatmentPHOSPHATE OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
end_item_identificationMRAP - COMMON NSN - USED ON MAXXPRO CAT I AND 1 OTHER WEAPON SYSTEM
cross-sectional_shape_styleRECTANGULAR
part_name_assigned_by_controlling_agencyWASHER,LOCK .344X.688X.089 PHC
NSN5310-01-244-8937
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 27326R1 · 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
SURFACE TREATMENT: PHOSPHATE OVERALL
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
MATERIAL: STEEL OVERALL
PERIPHERAL SHAPE STYLE: ROUND
CENTER HOLE SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURES5/16" HARDENED WASHER, .344 NOM ID, .688 NOM OD, .089 NOM THICKNESS. STEEL 1040 TO 1065 PER CEMS A-0, PART 1, QUENCHED AND TEMPERED TO RE36 TO 42. THESE WASHERS ARE INTENDED FOR USE IN HIGH CLAMPING LOADS, TO MINIMIZE EMBEDDING, AND TO AID TORQUING.
SURFACE TREATMENTPHOSPHATE OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
PART NAME ASSIGNED BY CONTROLLING AGENCYWASHER,LOCK .344X.688X.089 PHC
END ITEM IDENTIFICATIONMRAP - COMMON NSN - USED ON MAXXPRO CAT I AND 1 OTHER WEAPON SYSTEM
MATERIALSTEEL OVERALL
PERIPHERAL SHAPE STYLEROUND
CENTER HOLE SHAPE STYLEROUND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
73019Interchangeable
interchangeable cross-reference
interchangeable
2387006Interchangeable
interchangeable cross-reference
interchangeable
10945257Interchangeable
interchangeable cross-reference
interchangeable
25709R1Interchangeable
interchangeable cross-reference
interchangeable
ESP-F-16.104-PPInterchangeable
interchangeable cross-reference
interchangeable
120396Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 27326R1?
27326R1 is a WASHER,FLAT.
What parts can replace 27326R1?
There are 21 known substitutes for 27326R1: 73019, 2387006, 10945257 and 18 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 27326R1?
27326R1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-244-8937. This indicates validated use in U.S. government and defense supply chains.
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