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PartsTable / COMPONENT / X71123
X71123 ✓ 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,CONCAVE is a the manufacturer industrial component. Key specifications include color: BLACK OVERALL, radius: 1.000 INCHES NOMINAL IN, material: STEEL OVERALL, hole_diameter: 0.344 INCHES NOMINAL IN, recess_diameter: 0.688 INCHES NOMINAL IN, outside_diameter: 0.750 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-939-4824, 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
X71123
NSN: 5310-00-939-4824
FSC: 5310
CAGE: 88001 — UNITED STATES POSTAL SERVICE (USA)
SPECIFICATIONS
colorBLACK OVERALL
radius1.000 INCHES NOMINAL IN
materialSTEEL OVERALL
hole_diameter0.344 INCHES NOMINAL IN
recess_diameter0.688 INCHES NOMINAL IN
outside_diameter0.750 INCHES NOMINAL IN
style_designatorCONCAVE
surface_treatmentOXIDE FILM OVERALL
material_thickness0.131 INCHES NOMINAL IN
material_document_and_classificationSP-312 FSCM 94882 MFR REF SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-939-4824
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: X71123 · 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
•
COLOR: BLACK OVERALL
•
STYLE DESIGNATOR: CONCAVE
•
SURFACE TREATMENT: OXIDE FILM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: SP-312 FSCM 94882 MFR REF SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.750 INCHES NOMINAL IN
•
RADIUS: 1.000 INCHES NOMINAL IN
•
RECESS DIAMETER: 0.688 INCHES NOMINAL IN
•
HOLE DIAMETER: 0.344 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
COLORBLACK OVERALL
STYLE DESIGNATORCONCAVE
SURFACE TREATMENTOXIDE FILM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONSP-312 FSCM 94882 MFR REF SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.750 INCHES NOMINAL IN
RADIUS1.000 INCHES NOMINAL IN
RECESS DIAMETER0.688 INCHES NOMINAL IN
HOLE DIAMETER0.344 INCHES NOMINAL IN
MATERIAL THICKNESS0.131 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
31891Interchangeable
interchangeable cross-reference
interchangeable
R4268FInterchangeable
interchangeable cross-reference
interchangeable
XR26345Interchangeable
interchangeable cross-reference
interchangeable
TP312Interchangeable
interchangeable cross-reference
interchangeable
SP312Interchangeable
interchangeable cross-reference
interchangeable
4-1103-1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is X71123?
X71123 is a WASHER,CONCAVE.
What parts can replace X71123?
There are 17 known substitutes for X71123: 31891, R4268F, XR26345 and 14 more. Substitute compatibility should be verified for your specific system.
What is the NSN for X71123?
X71123 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-939-4824. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026