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PartsTable / COMPONENT / 99120871
99120871 ✓ 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 KEY,MACHINE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, flat_height: 0.413 INCHES NOMINAL IN, overall_width: 0.244 INCHES MINIMUM AND 0.248 INCHES MAXIMUM IN, overall_height: 0.555 INCHES MINIMUM AND 0.559 INCHES MAXIMUM IN, overall_length: 1.397 INCHES MINIMUM AND 1.437 INCHES MAXIMUM IN, style_designator: STEPPED. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-01-227-1329, 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
99120871
NSN: 5315-01-227-1329
FSC: 5315
CAGE: 71871 — ALFA LAVAL INC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
flat_height0.413 INCHES NOMINAL IN
overall_width0.244 INCHES MINIMUM AND 0.248 INCHES MAXIMUM IN
overall_height0.555 INCHES MINIMUM AND 0.559 INCHES MAXIMUM IN
overall_length1.397 INCHES MINIMUM AND 1.437 INCHES MAXIMUM IN
style_designatorSTEPPED
first_flat_length0.724 INCHES MINIMUM AND 0.764 INCHES MAXIMUM IN
key_chamfer_angle3.0 DEGREES NOMINAL
key_chamfer_length1.417 INCHES NOMINAL IN
starting_edge_shapeCHAMFERED
material_document_and_classificationQQ-S-637 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5315-01-227-1329
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 99120871 · 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
•
STYLE DESIGNATOR: STEPPED
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-637 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
KEY CHAMFER ANGLE: 3.0 DEGREES NOMINAL
•
FIRST FLAT LENGTH: 0.724 INCHES MINIMUM AND 0.764 INCHES MAXIMUM IN
•
KEY CHAMFER LENGTH: 1.417 INCHES NOMINAL IN
•
STARTING EDGE SHAPE: CHAMFERED
TECHNICAL CHARACTERISTICS (FLIS)
STYLE DESIGNATORSTEPPED
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-637 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
OVERALL WIDTH0.244 INCHES MINIMUM AND 0.248 INCHES MAXIMUM IN
KEY CHAMFER ANGLE3.0 DEGREES NOMINAL
OVERALL HEIGHT0.555 INCHES MINIMUM AND 0.559 INCHES MAXIMUM IN
FIRST FLAT LENGTH0.724 INCHES MINIMUM AND 0.764 INCHES MAXIMUM IN
KEY CHAMFER LENGTH1.417 INCHES NOMINAL IN
STARTING EDGE SHAPECHAMFERED
OVERALL LENGTH1.397 INCHES MINIMUM AND 1.437 INCHES MAXIMUM IN
MATERIALSTEEL OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
J221P239Interchangeable
interchangeable cross-reference
interchangeable
B-631-12505-40Interchangeable
interchangeable cross-reference
interchangeable
5331PL1673263Interchangeable
interchangeable cross-reference
interchangeable
14637Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 99120871?
99120871 is a KEY,MACHINE.
What parts can replace 99120871?
There are 4 known substitutes for 99120871: J221P239, B-631-12505-40, 5331PL1673263 and 1 more. Substitute compatibility should be verified for your specific system.
Is 99120871 still available?
99120871 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026