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ADD3123A — WASHER,KEY

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

ADD3123A: WASHER,KEY.

The WASHER,KEY is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 1.624 INCHES MINIMUM AND 1.624 INCHES MINIMUM AND 1.626 INCHES MAXIMUM1.626 INCHES MAXIMUM IN, outside_diameter: 2.750 INCHES NOMINAL2.750 INCHES NOMINAL IN, style_designator: KEYKEY, material_thickness: 0.500 INCHES NOMINAL0.500 INCHES NOMINAL IN, internal_key_quantity: 11. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-272-6474, 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
ADD3123A
NSN: 5310-00-272-6474
FSC: 5310 — Nuts and Washers
CAGE: 7PZX0 — FAIRBANKS MORSE, LLC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter1.624 INCHES MINIMUM AND 1.624 INCHES MINIMUM AND 1.626 INCHES MAXIMUM1.626 INCHES MAXIMUM IN
outside_diameter2.750 INCHES NOMINAL2.750 INCHES NOMINAL IN
style_designatorKEYKEY
material_thickness0.500 INCHES NOMINAL0.500 INCHES NOMINAL IN
internal_key_quantity11
internal_straight_key_width0.187 INCHES NOMINAL0.187 INCHES NOMINAL IN
material_document_and_classificationQQ-S-637 FED SPEC SINGLE MATERIAL RESPONSE OVERALLQQ-S-637 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
distance_from_centerline_to_top_of_internal_key1.000 INCHES NOMINAL1.000 INCHES NOMINAL IN
NSN5310-00-272-6474
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: ADD3123A · 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
•
INTERNAL STRAIGHT KEY WIDTH: 0.187 INCHES NOMINAL0.187 INCHES NOMINAL IN
•
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY: 1.000 INCHES NOMINAL1.000 INCHES NOMINAL IN
•
STYLE DESIGNATOR: KEYKEY
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-637 FED SPEC SINGLE MATERIAL RESPONSE OVERALLQQ-S-637 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 2.750 INCHES NOMINAL2.750 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.500 INCHES NOMINAL0.500 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
INTERNAL KEY QUANTITY: 11
TECHNICAL CHARACTERISTICS
INTERNAL STRAIGHT KEY WIDTH0.187 INCHES NOMINAL0.187 INCHES NOMINAL IN
DISTANCE FROM CENTERLINE TO TOP OF INTERNAL KEY1.000 INCHES NOMINAL1.000 INCHES NOMINAL IN
STYLE DESIGNATORKEYKEY
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-637 FED SPEC SINGLE MATERIAL RESPONSE OVERALLQQ-S-637 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER2.750 INCHES NOMINAL2.750 INCHES NOMINAL IN
MATERIAL THICKNESS0.500 INCHES NOMINAL0.500 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
INTERNAL KEY QUANTITY11
HOLE DIAMETER1.624 INCHES MINIMUM AND 1.624 INCHES MINIMUM AND 1.626 INCHES MAXIMUM1.626 INCHES MAXIMUM IN
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
SUBSTITUTES & CROSS-REFERENCES 9
10AD3E30APC19Reference document
Same NSN cross-reference
Reference document — Secondary reference
MADG30BPC19Reference document
Same NSN cross-reference
Reference document — Secondary reference
13AD6D30BPC19Reference document
Same NSN cross-reference
Reference document — Secondary reference
7AD6D30BPC19Reference document
Same NSN cross-reference
Reference document — Secondary reference
15AD3D30APC19Reference document
Same NSN cross-reference
Reference document — Secondary reference
MAD3D30APC19Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is ADD3123A?
ADD3123A is a WASHER,KEY.
What parts can replace ADD3123A?
There are 9 known substitutes for ADD3123A: 10AD3E30APC19, MADG30BPC19, 13AD6D30BPC19 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for ADD3123A?
ADD3123A is cataloged in the U.S. Government catalog under NSN 5310-00-272-6474. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.