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391-3670 — PIN,STRAIGHT,KNURLED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

391-3670: PIN,STRAIGHT,KNURLED.

The PIN,STRAIGHT,KNURLED is a the manufacturer industrial component. Key specifications include diameter: 0.2498 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN, material: STEEL COMP 303SE OVERALL, knurl_length: 0.220 INCHES NOMINAL IN, overall_length: 0.740 INCHES NOMINAL IN, first_end_style: SQUARE, second_end_style: CHAMFERED. This part is cataloged in the U.S.

Government catalog under NSN 5315-01-331-7866, 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
391-3670
NSN: 5315-01-331-7866
FSC: 5315 — Nails, Machine Keys, and Pins
CAGE: 14304 — L3HARRIS TECHNOLOGIES, INC. DBA HARRIS CORP DIV HARRIS DEFENSE COMMUNICATIONS (USA)
SPECIFICATIONS
diameter0.2498 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN
materialSTEEL COMP 303SE OVERALL
knurl_length0.220 INCHES NOMINAL IN
overall_length0.740 INCHES NOMINAL IN
first_end_styleSQUARE
second_end_styleCHAMFERED
style_designatorSTRAIGHT KNURLED
surface_treatmentPASSIVATE OVERALL
second_end_tip_radius0.030 INCHES NOMINAL IN
knurl_outside_diameter0.261 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN
second_end_taper_length0.290 INCHES NOMINAL IN
material_document_and_classificationASTM A582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5315-01-331-7866
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 391-3670 · 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
•
KNURL OUTSIDE DIAMETER: 0.261 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
KNURL LENGTH: 0.220 INCHES NOMINAL IN
•
FIRST END STYLE: SQUARE
•
STYLE DESIGNATOR: STRAIGHT KNURLED
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
DIAMETER: 0.2498 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
KNURL OUTSIDE DIAMETER0.261 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
KNURL LENGTH0.220 INCHES NOMINAL IN
FIRST END STYLESQUARE
STYLE DESIGNATORSTRAIGHT KNURLED
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
DIAMETER0.2498 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM IN
OVERALL LENGTH0.740 INCHES NOMINAL IN
SECOND END TAPER LENGTH0.290 INCHES NOMINAL IN
SECOND END RELATIONSHIP WITH FIRST ENDNOT IDENTICAL
OTHER ITEMS IN FSC 5315 — Nails, Machine Keys, and Pins
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5315-00-000-1037 5315-00-000-1067 5315-00-000-1245 5315-00-000-1372 5315-00-000-1412 5315-00-001-1571 5315-00-001-1572 5315-00-001-1602
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 391-3670?
391-3670 is a PIN,STRAIGHT,KNURLED.
What is the NSN for 391-3670?
391-3670 is cataloged in the U.S. Government catalog under NSN 5315-01-331-7866. 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.