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A309791 ✓ 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,KEY is a the manufacturer industrial component. Key specifications include material: STEEL COMP 304 OVERALL, hole_diameter: 1.992 INCHES MINIMUM AND 2.017 INCHES MAXIMUM IN, outside_diameter: 2.438 INCHES MINIMUM AND 2.468 INCHES MAXIMUM IN, style_designator: KEY, material_thickness: 0.053 INCHES MINIMUM AND 0.063 INCHES MAXIMUM IN, external_key_quantity: 13. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-468-5548, 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
A309791
NSN: 5310-01-468-5548
FSC: 5310
CAGE: 3X894 — CONTROL FLOW, INC. DBA CONTROL FLOW INC (USA)
SPECIFICATIONS
materialSTEEL COMP 304 OVERALL
hole_diameter1.992 INCHES MINIMUM AND 2.017 INCHES MAXIMUM IN
outside_diameter2.438 INCHES MINIMUM AND 2.468 INCHES MAXIMUM IN
style_designatorKEY
material_thickness0.053 INCHES MINIMUM AND 0.063 INCHES MAXIMUM IN
external_key_quantity13
external_prebent_key_angle45.0 DEGREES NOMINAL
external_prebent_key_width0.204 INCHES MINIMUM AND 0.234 INCHES MAXIMUM IN
internal_straight_key_width0.250 INCHES MINIMUM AND 0.290 INCHES MAXIMUM IN
overall_distance_including_keys2.906 INCHES MINIMUM AND 2.922 INCHES MAXIMUM IN
material_document_and_classificationQQ-S-764 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
distance_from_centerline_to_top_of_internal_key0.901 INCHES NOMINAL IN
NSN5310-01-468-5548
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: A309791 · 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
•
HOLE DIAMETER: 1.992 INCHES MINIMUM AND 2.017 INCHES MAXIMUM IN
•
EXTERNAL PREBENT KEY WIDTH: 0.204 INCHES MINIMUM AND 0.234 INCHES MAXIMUM IN
•
EXTERNAL PREBENT KEY ANGLE: 45.0 DEGREES NOMINAL
•
MATERIAL: STEEL COMP 304 OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-764 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY: 0.901 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 2.438 INCHES MINIMUM AND 2.468 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.053 INCHES MINIMUM AND 0.063 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
HOLE DIAMETER1.992 INCHES MINIMUM AND 2.017 INCHES MAXIMUM IN
EXTERNAL PREBENT KEY WIDTH0.204 INCHES MINIMUM AND 0.234 INCHES MAXIMUM IN
EXTERNAL PREBENT KEY ANGLE45.0 DEGREES NOMINAL
MATERIALSTEEL COMP 304 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-764 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY0.901 INCHES NOMINAL IN
OUTSIDE DIAMETER2.438 INCHES MINIMUM AND 2.468 INCHES MAXIMUM IN
MATERIAL THICKNESS0.053 INCHES MINIMUM AND 0.063 INCHES MAXIMUM IN
STYLE DESIGNATORKEY
INTERNAL STRAIGHT KEY WIDTH0.250 INCHES MINIMUM AND 0.290 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
33F1278Interchangeable
interchangeable cross-reference
interchangeable
DS110Interchangeable
interchangeable cross-reference
interchangeable
901-5Interchangeable
interchangeable cross-reference
interchangeable
WS-10Interchangeable
interchangeable cross-reference
interchangeable
G710386-1Interchangeable
interchangeable cross-reference
interchangeable
G710386-2Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A309791?
A309791 is a WASHER,KEY.
What parts can replace A309791?
There are 6 known substitutes for A309791: 33F1278, DS110, 901-5 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A309791?
A309791 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-468-5548. 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