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PartsTable / COMPONENT / Z1855-048
Z1855-048 ✓ 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

NUT,SELF-LOCKING,EXTENDED WASHER. Key specifications include material: IRON ALLOY 660 NUT, nut_style: DOUBLE HEXAGON, temp_rating: 1200.0 FAHRENHEIT NOMINAL DEGF, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF), overall_height: 0.396 INCHES MINIMUM AND 0.416 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-964-6781, 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
Z1855-048
NSN: 5310-00-964-6781
FSC: 5310
CAGE: 019L2 — ESNA, LLC (USA)
SPECIFICATIONS
materialIRON ALLOY 660 NUT
nut_styleDOUBLE HEXAGON
temp_rating1200.0 FAHRENHEIT NOMINAL DEGF
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
overall_height0.396 INCHES MINIMUM AND 0.416 INCHES MAXIMUM IN
locking_featurePREVAILING TORQUE ALL METAL DESIGN
thread_directionRIGHT-HAND
washer_thickness0.060 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN
precious_materialSILVER
surface_treatmentSILVER NUT
width_across_flats0.367 INCHES MINIMUM AND 0.376 INCHES MAXIMUM IN
NSN5310-00-964-6781
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: Z1855-048 · 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
•
WASHER THICKNESS: 0.060 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN
•
TEMP RATING: 1200.0 FAHRENHEIT NOMINAL DEGF
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: AMS 2410 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
WIDTH ACROSS FLATS: 0.369 INCHES MINIMUM AND 0.376 INCHES MAXIMUM IN
•
PRECIOUS MATERIAL: SILVER
•
MATERIAL: IRON ALLOY 660 OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5732 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
SURFACE TREATMENT: SILVER OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
WASHER THICKNESS0.060 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN
TEMP RATING1200.0 FAHRENHEIT NOMINAL DEGF
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONAMS 2410 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
WIDTH ACROSS FLATS0.369 INCHES MINIMUM AND 0.376 INCHES MAXIMUM IN
PRECIOUS MATERIALSILVER
MATERIALIRON ALLOY 660 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5732 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
SURFACE TREATMENTSILVER OVERALL
NOMINAL THREAD SIZE0.250 INCHES IN
WASHER OUTSIDE DIAMETER0.443 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
BH00445-4Interchangeable
interchangeable cross-reference
interchangeable
266096Interchangeable
interchangeable cross-reference
interchangeable
375089Interchangeable
interchangeable cross-reference
interchangeable
Z1855-048Interchangeable
interchangeable cross-reference
interchangeable
R399P2Interchangeable
Same NIIN cross-reference
interchangeable
SL4905-428Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is Z1855-048?
Z1855-048 is a NUT,SELF-LOCKING,EXTENDED WASHER.
What parts can replace Z1855-048?
There are 11 known substitutes for Z1855-048: BH00445-4, 266096, 375089 and 8 more. Substitute compatibility should be verified for your specific system.
Is Z1855-048 still available?
Z1855-048 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: July 2026