PartsTable
Technical Data Sheet
1243603-4 ✓ 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,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL COMP 304 OVERALL, thickness: 0.016 INCHES NOMINAL IN, hole_diameter: 0.189 INCHES MINIMUM AND 0.194 INCHES MAXIMUM IN, hardness_rating: 25.0 ROCKWELL C MINIMUM, overall_diameter: 0.266 INCHES MINIMUM AND 0.297 INCHES MAXIMUM IN, special_features: FLIGHT SAFETY CRITICAL AIRCRAFT PART. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-205-8740, 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
1243603-4
NSN: 5310-00-205-8740
FSC: 5310
CAGE: 55972 — HONEYWELL INTL INC DEFENSE AVIONICS SYSTEMS (USA)
SPECIFICATIONS
materialSTEEL COMP 304 OVERALL
thickness0.016 INCHES NOMINAL IN
hole_diameter0.189 INCHES MINIMUM AND 0.194 INCHES MAXIMUM IN
hardness_rating25.0 ROCKWELL C MINIMUM
overall_diameter0.266 INCHES MINIMUM AND 0.297 INCHES MAXIMUM IN
special_featuresFLIGHT SAFETY CRITICAL AIRCRAFT PART
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
criticality_code_justificationFEAT
material_document_and_classificationQQ-S-766,CLASS 1 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-205-8740
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 1243603-4 · 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: 0.016 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-766,CLASS 1 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
CENTER HOLE SHAPE STYLE: ROUND
OVERALL DIAMETER: 0.266 INCHES MINIMUM AND 0.297 INCHES MAXIMUM IN
PERIPHERAL SHAPE STYLE: ROUND
MATERIAL: STEEL COMP 304 OVERALL
HOLE DIAMETER: 0.189 INCHES MINIMUM AND 0.194 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURESFLIGHT SAFETY CRITICAL AIRCRAFT PART
THICKNESS0.016 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-766,CLASS 1 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
CENTER HOLE SHAPE STYLEROUND
OVERALL DIAMETER0.266 INCHES MINIMUM AND 0.297 INCHES MAXIMUM IN
PERIPHERAL SHAPE STYLEROUND
MATERIALSTEEL COMP 304 OVERALL
HOLE DIAMETER0.189 INCHES MINIMUM AND 0.194 INCHES MAXIMUM IN
HARDNESS RATING25.0 ROCKWELL C MINIMUM
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
571037Interchangeable
interchangeable cross-reference
interchangeable
FFS85TYPE2STYLE10PInterchangeable
interchangeable cross-reference
interchangeable
MIL-W-16878/4Interchangeable
interchangeable cross-reference
interchangeable
439-4444-000Interchangeable
interchangeable cross-reference
interchangeable
HP3-EXBHB93Interchangeable
interchangeable cross-reference
interchangeable
HL11VAP-6-7Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1243603-4?
1243603-4 is a WASHER,FLAT.
What parts can replace 1243603-4?
There are 22 known substitutes for 1243603-4: 571037, FFS85TYPE2STYLE10P, MIL-W-16878/4 and 19 more. Substitute compatibility should be verified for your specific system.
Is 1243603-4 still available?
1243603-4 is currently cancelled.
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