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66641 ✓ 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 SWITCH SUBASSEMBLY is a the manufacturer industrial component. Key specifications include height: 0.063 INCHES NOMINAL0.063 INCHES NOMINAL IN, material: STEEL, head_style: FLAT CHAMFERFLAT CHAMFER, first_end_style: SQUARESQUARE, style_designator: SHOULDER, first_step_length: 0.070 INCHES MINIMUM AND 0.070 INCHES MINIMUM AND 0.075 INCHES MAXIMUM0.075 INCHES MAXIMUM 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 5315-01-049-8484, 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
66641
NSN: 5315-01-049-8484
FSC: 5315
CAGE: 24930 — L3HARRIS TECHNOLOGIES, INC DIV SPACE & AIRBORNE SYSTEMS (USA)
SPECIFICATIONS
height0.063 INCHES NOMINAL0.063 INCHES NOMINAL IN
materialSTEEL
head_styleFLAT CHAMFERFLAT CHAMFER
first_end_styleSQUARESQUARE
style_designatorSHOULDER
first_step_length0.070 INCHES MINIMUM AND 0.070 INCHES MINIMUM AND 0.075 INCHES MAXIMUM0.075 INCHES MAXIMUM IN
pin_head_diameter0.281 INCHES NOMINAL0.281 INCHES NOMINAL IN
surface_treatmentPASSIVATE OVERALL
under_head_length0.302 INCHES MINIMUM AND 0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM0.322 INCHES MAXIMUM IN
second_step_length0.227 INCHES MINIMUM AND 0.227 INCHES MINIMUM AND 0.252 INCHES MAXIMUM0.252 INCHES MAXIMUM IN
first_step_diameter0.220 INCHES MINIMUM AND 0.220 INCHES MINIMUM AND 0.225 INCHES MAXIMUM0.225 INCHES MAXIMUM IN
second_step_diameter0.1885 INCHES MINIMUM AND 0.1885 INCHES MINIMUM AND 0.1890 INCHES MAXIMUM0.1890 INCHES MAXIMUM IN
NSN5315-01-049-8484
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 66641 · 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
•
FIRST STEP LENGTH: 0.070 INCHES MINIMUM AND 0.070 INCHES MINIMUM AND 0.075 INCHES MAXIMUM0.075 INCHES MAXIMUM IN
•
HEIGHT: 0.063 INCHES NOMINAL0.063 INCHES NOMINAL IN
•
HEAD STYLE: FLAT CHAMFERFLAT CHAMFER
•
MATERIAL: STEEL COMP 303 OVERALL
•
UNDER HEAD LENGTH: 0.302 INCHES MINIMUM AND 0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM0.322 INCHES MAXIMUM IN
•
FIRST STEP DIAMETER: 0.220 INCHES MINIMUM AND 0.220 INCHES MINIMUM AND 0.225 INCHES MAXIMUM0.225 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
SECOND STEP DIAMETER: 0.1885 INCHES MINIMUM AND 0.1885 INCHES MINIMUM AND 0.1890 INCHES MAXIMUM0.1890 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
FIRST STEP LENGTH0.070 INCHES MINIMUM AND 0.070 INCHES MINIMUM AND 0.075 INCHES MAXIMUM0.075 INCHES MAXIMUM IN
HEIGHT0.063 INCHES NOMINAL0.063 INCHES NOMINAL IN
HEAD STYLEFLAT CHAMFERFLAT CHAMFER
MATERIALSTEEL COMP 303 OVERALL
UNDER HEAD LENGTH0.302 INCHES MINIMUM AND 0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM0.322 INCHES MAXIMUM IN
FIRST STEP DIAMETER0.220 INCHES MINIMUM AND 0.220 INCHES MINIMUM AND 0.225 INCHES MAXIMUM0.225 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
SECOND STEP DIAMETER0.1885 INCHES MINIMUM AND 0.1885 INCHES MINIMUM AND 0.1890 INCHES MAXIMUM0.1890 INCHES MAXIMUM IN
FIRST END STYLESQUARESQUARE
STYLE DESIGNATORSHOULDER
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
19841N PIECE 13Interchangeable
interchangeable cross-reference
interchangeable
N66641Interchangeable
interchangeable cross-reference
interchangeable
66641Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 66641?
66641 is a SWITCH SUBASSEMBLY.
What parts can replace 66641?
There are 3 known substitutes for 66641: 19841N PIECE 13, N66641, 66641. Substitute compatibility should be verified for your specific system.
What is the NSN for 66641?
66641 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-01-049-8484. 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