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81MAC1 — PIN,GROOVED,HEADLESS

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

81MAC1: PIN,GROOVED,HEADLESS.

The PIN,GROOVED,HEADLESS is a the manufacturer industrial component. Key specifications include diameter: 0.623 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN, material: STEEL COMP 1117 OR STEEL COMP 1118 OVERALL, overall_length: 2.828 INCHES NOMINAL IN, undercut_width: 0.085 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN, first_end_style: RADIUS, undercut_radius: 0.0425 INCHES MINIMUM AND 0.0450 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5315-00-359-0659, 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
81MAC1
NSN: 5315-00-359-0659
FSC: 5315 — Nails, Machine Keys, and Pins
CAGE: 556A6 — LINDE MATERIAL HANDLING NORTH AMERICA CORPORATION (USA)
SPECIFICATIONS
diameter0.623 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
materialSTEEL COMP 1117 OR STEEL COMP 1118 OVERALL
overall_length2.828 INCHES NOMINAL IN
undercut_width0.085 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN
first_end_styleRADIUS
undercut_radius0.0425 INCHES MINIMUM AND 0.0450 INCHES MAXIMUM IN
effective_length2.656 INCHES NOMINAL IN
style_designatorGROOVE
undercut_diameter0.535 INCHES MINIMUM AND 0.540 INCHES MAXIMUM IN
first_end_locationBOTH ENDS
first_end_corner_radius0.062 INCHES NOMINAL IN
material_document_and_classificationSAE ASSN STD ALL MATERIAL RESPONSES OVERALL
NSN5315-00-359-0659
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 81MAC1 · 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 WIDTH: 0.085 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN
•
UNDERCUT DIAMETER: 0.535 INCHES MINIMUM AND 0.540 INCHES MAXIMUM IN
•
FIRST END LOCATION: BOTH ENDS
•
FIRST END STYLE: RADIUS
•
STYLE DESIGNATOR: GROOVE
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE ASSN STD ALL MATERIAL RESPONSES OVERALL
•
DIAMETER: 0.623 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
UNDERCUT WIDTH0.085 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN
UNDERCUT DIAMETER0.535 INCHES MINIMUM AND 0.540 INCHES MAXIMUM IN
FIRST END LOCATIONBOTH ENDS
FIRST END STYLERADIUS
STYLE DESIGNATORGROOVE
MATERIAL DOCUMENT AND CLASSIFICATIONSAE ASSN STD ALL MATERIAL RESPONSES OVERALL
DIAMETER0.623 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
OVERALL LENGTH2.828 INCHES NOMINAL IN
SECOND END RELATIONSHIP WITH FIRST ENDIDENTICAL
EFFECTIVE LENGTH2.656 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 2
1259T150Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
38364Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 81MAC1?
81MAC1 is a PIN,GROOVED,HEADLESS.
What parts can replace 81MAC1?
There are 2 known substitutes for 81MAC1: 1259T150, 38364. Substitute compatibility should be verified for your specific system.
What is the NSN for 81MAC1?
81MAC1 is cataloged in the U.S. Government catalog under NSN 5315-00-359-0659. 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.