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121551 ✓ 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

CASE,ELECTRONIC COMMUNICATIONS E. Key specifications include length: 0.312 INCHES NOMINAL SQUARE END IN, material: STEEL OVERALL, thread_length: 1.130 INCHES MINIMUM IN, overall_length: 2.500 INCHES NOMINAL IN, shank_diameter: 0.318 INCHES MINIMUM IN, style_designator: STRAIGHT FLUTE. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-196-5090, 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
121551
NSN: 5310-00-196-5090
FSC: 5310
CAGE: 90073 — CMC ELECTRONICS INC (CAN)
SPECIFICATIONS
length0.312 INCHES NOMINAL SQUARE END IN
materialSTEEL OVERALL
thread_length1.130 INCHES MINIMUM IN
flute_quantity4
overall_length2.500 INCHES NOMINAL IN
shank_diameter0.318 INCHES MINIMUM IN
style_designatorSTRAIGHT FLUTE
thread_directionRIGHT-HAND
thread_structureREGULAR
width_across_flats0.191 INCHES NOMINAL IN
starting_chamfer_typePLUG
thread_forming_methodGROUND
NSN5310-00-196-5090
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 121551 · 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
•
THICKNESS: 0.064 INCHES NOMINAL IN
•
MATERIAL: COPPER ALLOY OVERALL
•
OVERALL DIAMETER: 0.750 INCHES NOMINAL IN
•
CENTER HOLE SHAPE STYLE: ROUND
•
PERIPHERAL SHAPE STYLE: ROUND
•
HOLE DIAMETER: 0.337 INCHES NOMINAL IN
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
TECHNICAL CHARACTERISTICS (FLIS)
THICKNESS0.064 INCHES NOMINAL IN
MATERIALCOPPER ALLOY OVERALL
OVERALL DIAMETER0.750 INCHES NOMINAL IN
CENTER HOLE SHAPE STYLEROUND
PERIPHERAL SHAPE STYLEROUND
HOLE DIAMETER0.337 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
SR19TInterchangeable
interchangeable cross-reference
interchangeable
14056Interchangeable
interchangeable cross-reference
interchangeable
B94.9Interchangeable
interchangeable cross-reference
interchangeable
121551Interchangeable
interchangeable cross-reference
interchangeable
D160034L000Interchangeable
Same NIIN cross-reference
interchangeable
F20065K001 ITEM 16Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 121551?
121551 is a CASE,ELECTRONIC COMMUNICATIONS E.
What parts can replace 121551?
There are 6 known substitutes for 121551: SR19T, 14056, B94.9 and 3 more. Substitute compatibility should be verified for your specific system.
Is 121551 still available?
121551 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