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M21891 — PIN,STRAIGHT,HEADLESS

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

M21891: PIN,STRAIGHT,HEADLESS.

The PIN,STRAIGHT,HEADLESS is a the manufacturer industrial component. Key specifications include material: STEEL COMP B1111 OR STEEL COMP B1112 OR STEEL COMP B1113 OVERALL, first_end_style: CHAMFERED, pin_overall_length: 1.738 INCHES MINIMUM AND 1.762 INCHES MAXIMUM IN, pin_overall_diameter: 0.3712 INCHES MINIMUM AND 0.3717 INCHES MAXIMUM IN, first_end_taper_angle: 25.0 DEGREES NOMINAL, first_end_taper_length: 0.031 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5315-00-014-1250, 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
M21891
NSN: 5315-00-014-1250
FSC: 5315 — Nails, Machine Keys, and Pins
CAGE: 61038 — VICKERS INC (USA)
SPECIFICATIONS
materialSTEEL COMP B1111 OR STEEL COMP B1112 OR STEEL COMP B1113 OVERALL
first_end_styleCHAMFERED
pin_overall_length1.738 INCHES MINIMUM AND 1.762 INCHES MAXIMUM IN
pin_overall_diameter0.3712 INCHES MINIMUM AND 0.3717 INCHES MAXIMUM IN
first_end_taper_angle25.0 DEGREES NOMINAL
first_end_taper_length0.031 INCHES NOMINAL IN
material_document_and_classificationQQ-S-633 FED SPEC ALL MATERIAL RESPONSES OVERALL
second_end_relationship_with_first_endIDENTICAL
NSN5315-00-014-1250
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: M21891 · 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 TAPER LENGTH: 0.031 INCHES NOMINAL IN
•
FIRST END STYLE: CHAMFERED
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-633 FED SPEC ALL MATERIAL RESPONSES OVERALL
•
FIRST END TAPER ANGLE: 25.0 DEGREES NOMINAL
•
PIN OVERALL DIAMETER: 0.3712 INCHES MINIMUM AND 0.3717 INCHES MAXIMUM IN
•
PIN OVERALL LENGTH: 1.738 INCHES MINIMUM AND 1.762 INCHES MAXIMUM IN
•
SECOND END RELATIONSHIP WITH FIRST END: IDENTICAL
•
MATERIAL: STEEL COMP B1111 OR STEEL COMP B1112 OR STEEL COMP B1113 OVERALL
TECHNICAL CHARACTERISTICS
FIRST END TAPER LENGTH0.031 INCHES NOMINAL IN
FIRST END STYLECHAMFERED
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-633 FED SPEC ALL MATERIAL RESPONSES OVERALL
FIRST END TAPER ANGLE25.0 DEGREES NOMINAL
PIN OVERALL DIAMETER0.3712 INCHES MINIMUM AND 0.3717 INCHES MAXIMUM IN
PIN OVERALL LENGTH1.738 INCHES MINIMUM AND 1.762 INCHES MAXIMUM IN
SECOND END RELATIONSHIP WITH FIRST ENDIDENTICAL
MATERIALSTEEL COMP B1111 OR STEEL COMP B1112 OR STEEL COMP B1113 OVERALL
SUBSTITUTES & CROSS-REFERENCES 1
141250Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is M21891?
M21891 is a PIN,STRAIGHT,HEADLESS.
What parts can replace M21891?
There is 1 known substitute for M21891: 141250. Substitute compatibility should be verified for your specific system.
What is the NSN for M21891?
M21891 is cataloged in the U.S. Government catalog under NSN 5315-00-014-1250. 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.