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Technical Data Sheet
PartsTable / COMPONENT / SM-A-803658-1
SM-A-803658-1 ✓ 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,RECESSED is a the manufacturer industrial component. Key specifications include recess_angle: 45.0 DEGREES NOMINAL, hole_diameter: 0.219 INCHES NOMINAL IN, recess_diameter: 0.312 INCHES NOMINAL IN, outside_diameter: 0.439 INCHES NOMINAL IN, style_designator: RECESSED, surface_treatment: PASSIVATE OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-070-6672, 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
SM-A-803658-1
NSN: 5310-00-070-6672
FSC: 5310
CAGE: 80063 — US ARMY COMMUNICATIONS & ELECTRONICS MATERIEL READINESS COMMAND LOGISTICS ENGINEERING DIR (USA)
SPECIFICATIONS
recess_angle45.0 DEGREES NOMINAL
hole_diameter0.219 INCHES NOMINAL IN
recess_diameter0.312 INCHES NOMINAL IN
outside_diameter0.439 INCHES NOMINAL IN
style_designatorRECESSED
surface_treatmentPASSIVATE OVERALL
material_thickness0.250 INCHES NOMINAL IN
material_document_and_classificationMIL-S-7720 MIL SPEC 1ST MATERIAL RESPONSE OR ASTM A582 ASSN STD 2ND MATERIAL RESPONSE OVERALL
NSN5310-00-070-6672
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: SM-A-803658-1 · 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
•
OUTSIDE DIAMETER: 0.439 INCHES NOMINAL IN
•
HOLE DIAMETER: 0.219 INCHES NOMINAL IN
•
RECESS ANGLE: 45.0 DEGREES NOMINAL
•
MATERIAL THICKNESS: 0.250 INCHES NOMINAL IN
•
STYLE DESIGNATOR: RECESSED
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-7720 MIL SPEC 1ST MATERIAL RESPONSE OR ASTM A582 ASSN STD 2ND MATERIAL RESPONSE OVERALL
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
RECESS DIAMETER: 0.312 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
OUTSIDE DIAMETER0.439 INCHES NOMINAL IN
HOLE DIAMETER0.219 INCHES NOMINAL IN
RECESS ANGLE45.0 DEGREES NOMINAL
MATERIAL THICKNESS0.250 INCHES NOMINAL IN
STYLE DESIGNATORRECESSED
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-7720 MIL SPEC 1ST MATERIAL RESPONSE OR ASTM A582 ASSN STD 2ND MATERIAL RESPONSE OVERALL
SURFACE TREATMENTPASSIVATE OVERALL
RECESS DIAMETER0.312 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
3M1583Interchangeable
interchangeable cross-reference
interchangeable
8304735Interchangeable
interchangeable cross-reference
interchangeable
35349Interchangeable
interchangeable cross-reference
interchangeable
C743586-8SUB5Interchangeable
interchangeable cross-reference
interchangeable
3173Interchangeable
interchangeable cross-reference
interchangeable
72368RInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is SM-A-803658-1?
SM-A-803658-1 is a WASHER,RECESSED.
What parts can replace SM-A-803658-1?
There are 12 known substitutes for SM-A-803658-1: 3M1583, 8304735, 35349 and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for SM-A-803658-1?
SM-A-803658-1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-070-6672. 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