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Technical Data Sheet
PartsTable / COMPONENT / 00648-6
00648-6 ✓ 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,CONCAVE is a the manufacturer industrial component. Key specifications include radius: 0.650 INCHES NOMINAL IN, material: STEEL COMP 1042 OVERALL, recess_depth: 0.132 INCHES NOMINAL IN, hole_diameter: 0.810 INCHES NOMINAL IN, surface_finish: 63.0 MICROINCHES TOP, hardness_rating: 34.0 ROCKWELL C MINIMUM AND 41.0 ROCKWELL C MAXIMUM. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-868-5526, 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
00648-6
NSN: 5310-00-868-5526
FSC: 5310
CAGE: 14153 — DEFENSE LOGISTICS AGENCY DBA DEFENSE SUPPLY CENTER PHILADELPHIA (USA)
SPECIFICATIONS
radius0.650 INCHES NOMINAL IN
materialSTEEL COMP 1042 OVERALL
recess_depth0.132 INCHES NOMINAL IN
hole_diameter0.810 INCHES NOMINAL IN
surface_finish63.0 MICROINCHES TOP
hardness_rating34.0 ROCKWELL C MINIMUM AND 41.0 ROCKWELL C MAXIMUM
outside_diameter1.198 INCHES MINIMUM AND 1.208 INCHES MAXIMUM IN
style_designatorCONCAVE
surface_treatmentCADMIUM AND CHROMATE OVERALL
material_thickness0.234 INCHES NOMINAL IN
material_document_and_classification66 FED STD SINGLE MATERIAL RESPONSE OVERALL
part_name_assigned_by_controlling_agencyNAVY SPECIAL PROJECT
NSN5310-00-868-5526
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 00648-6 · 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
•
RECESS DEPTH: 0.132 INCHES NOMINAL IN
•
HARDNESS RATING: 34.0 ROCKWELL C MINIMUM AND 41.0 ROCKWELL C MAXIMUM
•
HOLE DIAMETER: 0.810 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.234 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 1.198 INCHES MINIMUM AND 1.208 INCHES MAXIMUM IN
•
RADIUS: 0.650 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
RECESS DEPTH0.132 INCHES NOMINAL IN
HARDNESS RATING34.0 ROCKWELL C MINIMUM AND 41.0 ROCKWELL C MAXIMUM
HOLE DIAMETER0.810 INCHES NOMINAL IN
MATERIAL THICKNESS0.234 INCHES NOMINAL IN
OUTSIDE DIAMETER1.198 INCHES MINIMUM AND 1.208 INCHES MAXIMUM IN
RADIUS0.650 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
PART NAME ASSIGNED BY CONTROLLING AGENCYNAVY SPECIAL PROJECT
STYLE DESIGNATORCONCAVE
MATERIALSTEEL COMP 1042 OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
56S821Interchangeable
interchangeable cross-reference
interchangeable
SM1212Interchangeable
interchangeable cross-reference
interchangeable
HMI-7611A-2Interchangeable
interchangeable cross-reference
interchangeable
101472NInterchangeable
interchangeable cross-reference
interchangeable
293510Interchangeable
interchangeable cross-reference
interchangeable
161004Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 00648-6?
00648-6 is a WASHER,CONCAVE.
What parts can replace 00648-6?
There are 6 known substitutes for 00648-6: 56S821, SM1212, HMI-7611A-2 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 00648-6?
00648-6 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-868-5526. 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