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Technical Data Sheet
PartsTable / COMPONENT / 1203-61
1203-61 ✓ 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

POLARIZING KEY,ELECTRICAL CONNEC. Key specifications include material: STEEL OVERALL, nut_style: HEXAGON, nut_height: 0.117 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN, thread_class: 2B, thread_series: UNIFIED NATIONAL COARSE (UNC), overall_diameter: 0.070 INCHES MINIMUM AND 0.075 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-012-0361, 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
1203-61
NSN: 5310-00-012-0361
FSC: 5310
CAGE: 11743 — CHECKER MOTORS CORPORATION (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
nut_height0.117 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
overall_diameter0.070 INCHES MINIMUM AND 0.075 INCHES MAXIMUM IN
special_featuresSTAINLESS STEEL;0.445 IN. LG IN
thread_directionRIGHT-HAND
surface_treatmentCADMIUM AND CHROMATE OVERALL
width_across_flats0.362 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
nominal_thread_size0.190 INCHES IN
bearing_surface_typeCHAMFERED
NSN5310-00-012-0361
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 1203-61 · 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
•
WIDTH ACROSS FLATS: 0.362 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
•
BEARING SURFACE TYPE: CHAMFERED
•
NOMINAL THREAD SIZE: 0.190 INCHES IN
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
THREAD QUANTITY PER INCH: 24
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
NUT STYLE: HEXAGON
•
SURFACE TREATMENT: CADMIUM AND PHOSPHATE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
WIDTH ACROSS FLATS0.362 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
BEARING SURFACE TYPECHAMFERED
NOMINAL THREAD SIZE0.190 INCHES IN
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
THREAD QUANTITY PER INCH24
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NUT STYLEHEXAGON
SURFACE TREATMENTCADMIUM AND PHOSPHATE OVERALL
THREAD CLASS2B
MATERIALSTEEL OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 29
125-10491-07Interchangeable
interchangeable cross-reference
interchangeable
1928Interchangeable
interchangeable cross-reference
interchangeable
8064Interchangeable
interchangeable cross-reference
interchangeable
BACC47CR1AInterchangeable
interchangeable cross-reference
interchangeable
GK802P1Interchangeable
interchangeable cross-reference
interchangeable
96S-22-07Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1203-61?
1203-61 is a POLARIZING KEY,ELECTRICAL CONNEC.
What parts can replace 1203-61?
There are 29 known substitutes for 1203-61: 125-10491-07, 1928, 8064 and 26 more. Substitute compatibility should be verified for your specific system.
Is 1203-61 still available?
1203-61 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