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1A561 — PIN,SHOULDER,HEADLESS

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

1A561: PIN,SHOULDER,HEADLESS.

The PIN,SHOULDER,HEADLESS is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1215 OVERALL, thread_class: 2A A, thread_length: 0.440 INCHES NOMINAL IN, overall_length: 2.125 INCHES NOMINAL IN, first_end_style: SQUARE, thread_direction: RIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 5315-01-026-5239, 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
1A561
NSN: 5315-01-026-5239
FSC: 5315 — Nails, Machine Keys, and Pins
CAGE: 21102 — EVANS TEMPCON MICHIGAN, LLC (USA)
SPECIFICATIONS
materialSTEEL COMP 1215 OVERALL
thread_class2A A
thread_length0.440 INCHES NOMINAL IN
overall_length2.125 INCHES NOMINAL IN
first_end_styleSQUARE
thread_directionRIGHT-HAND
undercut_diameter0.150 INCHES NOMINAL IN
first_end_locationBOTH ENDS
nominal_thread_size0.250 INCHES IN
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
shoulder_width_across_flats0.380 INCHES NOMINAL IN
second_end_relationship_with_first_endIDENTICAL
NSN5315-01-026-5239
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 1A561 · 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
•
UNDERCUT DIAMETER: 0.150 INCHES NOMINAL IN
•
FIRST END LOCATION: BOTH ENDS
•
THREAD LENGTH: 0.440 INCHES NOMINAL IN
•
FIRST END STYLE: SQUARE
•
SECOND END RELATIONSHIP WITH FIRST END: IDENTICAL
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
TECHNICAL CHARACTERISTICS
UNDERCUT DIAMETER0.150 INCHES NOMINAL IN
FIRST END LOCATIONBOTH ENDS
THREAD LENGTH0.440 INCHES NOMINAL IN
FIRST END STYLESQUARE
OVERALL LENGTH2.125 INCHES NOMINAL IN
SECOND END RELATIONSHIP WITH FIRST ENDIDENTICAL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.250 INCHES IN
SHOULDER WIDTH ACROSS FLATS0.380 INCHES NOMINAL IN
THREAD CLASS2A A
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 1A561?
1A561 is a PIN,SHOULDER,HEADLESS.
What is the NSN for 1A561?
1A561 is cataloged in the U.S. Government catalog under NSN 5315-01-026-5239. 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.