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Technical Data Sheet

A51B21644-15 — Technical Data Sheet

✓ 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 material: STEEL OVERALL, recess_angle: 90.0 DEGREES NOMINAL, recess_depth: 0.094 INCHES NOMINAL IN, hole_diameter: 0.514 INCHES MINIMUM AND 0.523 INCHES MAXIMUM IN, heat_treatment: QUENCHED AND TEMPERED, overall_height: 0.187 INCHES NOMINAL 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 5310-00-004-7046, 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
A51B21644-15
NSN: 5310-00-004-7046
FSC: 5310
CAGE: 61174 — NORTHROP GRUMMAN SYSTEMS CORPORATION DBA NORTHROP GRUMMAN SYSTEMS CORP DIV NORTHROP GRUMMAN AERONAUTICS SYSTEMS (USA)
SPECIFICATIONS
materialSTEEL OVERALL
recess_angle90.0 DEGREES NOMINAL
recess_depth0.094 INCHES NOMINAL IN
hole_diameter0.514 INCHES MINIMUM AND 0.523 INCHES MAXIMUM IN
heat_treatmentQUENCHED AND TEMPERED
overall_height0.187 INCHES NOMINAL IN
hardness_rating46.0 ROCKWELL C MINIMUM AND 49.0 ROCKWELL C MAXIMUM
recess_diameter0.604 INCHES MINIMUM AND 0.620 INCHES MAXIMUM IN
outside_diameter1.750 INCHES NOMINAL IN
special_featuresONE BEARING SURFACE CHAMFERED 0.125 IN. BY 45 DEG IN
style_designatorRECESSED
surface_treatmentCADMIUM OVERALL
NSN5310-00-004-7046
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: A51B21644-15 · 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
MATERIAL THICKNESS: 0.187 INCHES NOMINAL IN
RECESS DIAMETER: 0.604 INCHES MINIMUM AND 0.620 INCHES MAXIMUM IN
HOLE DIAMETER: 0.514 INCHES MINIMUM AND 0.523 INCHES MAXIMUM IN
RECESS DEPTH: 0.094 INCHES NOMINAL IN
HARDNESS RATING: 46.0 ROCKWELL C MINIMUM AND 49.0 ROCKWELL C MAXIMUM
OUTSIDE DIAMETER: 1.750 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL THICKNESS0.187 INCHES NOMINAL IN
RECESS DIAMETER0.604 INCHES MINIMUM AND 0.620 INCHES MAXIMUM IN
HOLE DIAMETER0.514 INCHES MINIMUM AND 0.523 INCHES MAXIMUM IN
OVERALL HEIGHT0.187 INCHES NOMINAL IN
RECESS DEPTH0.094 INCHES NOMINAL IN
HARDNESS RATING46.0 ROCKWELL C MINIMUM AND 49.0 ROCKWELL C MAXIMUM
OUTSIDE DIAMETER1.750 INCHES NOMINAL IN
SPECIAL FEATURESONE BEARING SURFACE CHAMFERED 0.125 IN. BY 45 DEG IN
PART NAME ASSIGNED BY CONTROLLING AGENCYNAVY SPECIAL PROJECT
HEAT TREATMENTQUENCHED AND TEMPERED
VERIFIED SUBSTITUTES & CROSS-REFERENCES

No verified substitutes available.

LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A51B21644-15?
A51B21644-15 is a WASHER,RECESSED.
What is the NSN for A51B21644-15?
A51B21644-15 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-004-7046. This indicates validated use in U.S. government and defense supply chains.
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