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1-72UNF3A1-8 — SETSCREW

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

1-72UNF3A1-8: SETSCREW.

The SETSCREW is a the manufacturer industrial component. Key specifications include material: STEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 316 OVERALL, head_style: HEADLESS (SETSCREW), point_style: CUP, spline_width: 0.011 INCHES MINIMUM AND 0.012 INCHES MAXIMUM IN, thread_class: 3A A, thread_length: 0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-00-372-9989, 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
1-72UNF3A1-8
NSN: 5305-00-372-9989
FSC: 5305 — Screws
CAGE: 70318 — ALLMETAL SCREW PRODUCTS CORP (USA)
SPECIFICATIONS
materialSTEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 316 OVERALL
head_styleHEADLESS (SETSCREW)
point_styleCUP
spline_width0.011 INCHES MINIMUM AND 0.012 INCHES MAXIMUM IN
thread_class3A A
thread_length0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
fastener_length0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
hardness_rating25.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE OVERALL
internal_drive_styleFOUR SPLINE
spline_major_diameter0.034 INCHES MINIMUM AND 0.035 INCHES MAXIMUM IN
NSN5305-00-372-9989
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 1-72UNF3A1-8 · OEM ⚠ VERIFY BEFORE ORDERING Verify thread pitch before ordering — metric (M8×1.25) ≠ imperial (5/16-18). Wrong thread = wrong part. Grade/class stamped on bolt head determines tensile strength ✓ BROKER TIP Grade/class stamped on head determines tensile strength. Grade 8 > Grade 5 > Grade 2. Always confirm head marking matches specification requirement PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
SPLINE MINOR DIAMETER: 0.025 INCHES MINIMUM AND 0.026 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
•
SPLINE WIDTH: 0.011 INCHES MINIMUM AND 0.012 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
•
HARDNESS RATING: 25.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD ALL MATERIAL RESPONSES OVERALL
•
SPLINE MAJOR DIAMETER: 0.034 INCHES MINIMUM AND 0.035 INCHES MAXIMUM IN
•
NOMINAL THREAD DIAMETER: 0.073 INCHES IN
TECHNICAL CHARACTERISTICS
SPLINE MINOR DIAMETER0.025 INCHES MINIMUM AND 0.026 INCHES MAXIMUM IN
FASTENER LENGTH0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
SPLINE WIDTH0.011 INCHES MINIMUM AND 0.012 INCHES MAXIMUM IN
THREAD LENGTH0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
HARDNESS RATING25.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD ALL MATERIAL RESPONSES OVERALL
SPLINE MAJOR DIAMETER0.034 INCHES MINIMUM AND 0.035 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER0.073 INCHES IN
HEAD STYLEHEADLESS (SETSCREW)
THREAD DIRECTIONRIGHT-HAND
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-001-5016 5305-00-001-9160 5305-00-001-9629 5305-00-001-9742 5305-00-001-9768 5305-00-003-4306 5305-00-003-6694 5305-00-003-6753
SUBSTITUTES & CROSS-REFERENCES 1
035224-104Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 1-72UNF3A1-8?
1-72UNF3A1-8 is a SETSCREW.
What parts can replace 1-72UNF3A1-8?
There is 1 known substitute for 1-72UNF3A1-8: 035224-104. Substitute compatibility should be verified for your specific system.
What is the NSN for 1-72UNF3A1-8?
1-72UNF3A1-8 is cataloged in the U.S. Government catalog under NSN 5305-00-372-9989. 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.