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Technical Data Sheet
PartsTable / COMPONENT / 221377
221377 ✓ 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 ELBOW,PIPE is a the manufacturer industrial component. Key specifications include special_features: DO NOT DUPE TO NSN 5315-00-198-5999; THIS NSN IS FOR PEARL HARBOR USE ONLY; THIS IS A NON-STANDARD UNIT-OF-ISSUE. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-198-5999, 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
221377
NSN: 5315-00-198-5999
FSC: 5315
CAGE: 21450 — ARMY WEAPONS COMMAND ATTN AMSWE-REE-S (USA)
SPECIFICATIONS
special_featuresDO NOT DUPE TO NSN 5315-00-198-5999; THIS NSN IS FOR PEARL HARBOR USE ONLY; THIS IS A NON-STANDARD UNIT-OF-ISSUE
NSN5315-00-198-5999
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 221377 · 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
•
FIRST END LOCATION: BOTH ENDS
•
PIN OVERALL LENGTH: 3.970 INCHES MINIMUM AND 4.030 INCHES MAXIMUM IN
•
SECOND END RELATIONSHIP WITH FIRST END: IDENTICAL
•
FIRST END OUTER RADIUS: 0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN
•
MATERIAL: STEEL OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD SINGLE MATERIAL RESPONSE OVERALL
•
SURFACE FINISH: 63.0 MICROINCHES SHANK END
•
PIN SIZE DESIGNATION: 8
TECHNICAL CHARACTERISTICS (FLIS)
FIRST END LOCATIONBOTH ENDS
PIN OVERALL LENGTH3.970 INCHES MINIMUM AND 4.030 INCHES MAXIMUM IN
SECOND END RELATIONSHIP WITH FIRST ENDIDENTICAL
FIRST END OUTER RADIUS0.740 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN
MATERIALSTEEL OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD SINGLE MATERIAL RESPONSE OVERALL
SURFACE FINISH63.0 MICROINCHES SHANK END
PIN SIZE DESIGNATION8
FIRST END STYLEOVAL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
4662Interchangeable
interchangeable cross-reference
interchangeable
256-0179-010Interchangeable
interchangeable cross-reference
interchangeable
30X562Interchangeable
interchangeable cross-reference
interchangeable
12X199Interchangeable
interchangeable cross-reference
interchangeable
3064686Interchangeable
interchangeable cross-reference
interchangeable
543211Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 221377?
221377 is a ELBOW,PIPE.
What parts can replace 221377?
There are 21 known substitutes for 221377: 4662, 256-0179-010, 30X562 and 18 more. Substitute compatibility should be verified for your specific system.
Is 221377 still available?
221377 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