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ASME B18.21.1-A2 SIZE 5/16IN — Technical Data Sheet

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— · 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 hole_diameter: 0.343 INCHES NOMINAL IN, overall_diameter: 0.750 INCHES NOMINAL IN, special_features: ASME B18.21.1-A2 SIZE 5/16IN. 0.312IN IN, peripheral_shape_style: RECTANGULAR, center_hole_shape_style: ROUND, cross-sectional_shape_style: BLANK RECTANGULAR.

This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System under NSN 5310-01-714-3663, 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
ASME B18.21.1-A2 SIZE 5/16IN
NSN: 5310-01-714-3663
FSC: 5310
CAGE: 80204 — AMERICAN NATIONAL STANDARDS INSTITUTE INCORPORATED DBA AMERICAN NATIONAL STANDARDS INSTITUTE (USA)
SPECIFICATIONS
hole_diameter0.343 INCHES NOMINAL IN
overall_diameter0.750 INCHES NOMINAL IN
special_featuresASME B18.21.1-A2 SIZE 5/16IN. 0.312IN IN
peripheral_shape_styleRECTANGULAR
center_hole_shape_styleROUND
cross-sectional_shape_styleBLANK RECTANGULAR
part_name_assigned_by_controlling_agencyFLAT WASHER
NSN5310-01-714-3663
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: ASME B18.21.1-A2 SIZE 5/16IN · 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
•
CENTER HOLE SHAPE STYLE: ROUND
•
CROSS-SECTIONAL SHAPE STYLE: BLANK RECTANGULAR
•
OVERALL DIAMETER: 0.750 INCHES NOMINAL IN
•
PERIPHERAL SHAPE STYLE: RECTANGULAR
•
HOLE DIAMETER: 0.343 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
CENTER HOLE SHAPE STYLEROUND
CROSS-SECTIONAL SHAPE STYLEBLANK RECTANGULAR
PART NAME ASSIGNED BY CONTROLLING AGENCYFLAT WASHER
OVERALL DIAMETER0.750 INCHES NOMINAL IN
PERIPHERAL SHAPE STYLERECTANGULAR
SPECIAL FEATURESASME B18.21.1-A2 SIZE 5/16IN. 0.312IN IN
HOLE DIAMETER0.343 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
20122InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
34600PC117InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
50456InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
SC-C-69585InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
N382830058InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
38283 0059InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is ASME B18.21.1-A2 SIZE 5/16IN?
ASME B18.21.1-A2 SIZE 5/16IN is a WASHER,FLAT.
What parts can replace ASME B18.21.1-A2 SIZE 5/16IN?
There are 10 known substitutes for ASME B18.21.1-A2 SIZE 5/16IN: 20122, 34600PC117, 50456 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for ASME B18.21.1-A2 SIZE 5/16IN?
ASME B18.21.1-A2 SIZE 5/16IN is cataloged in the Federal Logistics Information System under NSN 5310-01-714-3663. This indicates validated use in U.S. government and defense supply chains.
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Last verified: October 2026