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5521-16 — INSERT,SCREW THREAD

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

5521-16: INSERT,SCREW THREAD.

The INSERT,SCREW THREAD is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thread_length: 1.50 INCHES NOMINAL IN, special_features: THREAD SIZE 1-8 INCHES; INCLUDES DRILL/TAP/TANG REMOVAL IN, style_designator: COIL, thread_direction: RIGHT-HAND, end_item_identification: 3470-01-575-2955. This part is cataloged in the U.S.

Government catalog under NSN 5325-01-644-5974, 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
5521-16
NSN: 5325-01-644-5974
FSC: 5325 — Fastening Devices
CAGE: 03018 — S W ANDERSON CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thread_length1.50 INCHES NOMINAL IN
special_featuresTHREAD SIZE 1-8 INCHES; INCLUDES DRILL/TAP/TANG REMOVAL IN
style_designatorCOIL
thread_directionRIGHT-HAND
end_item_identification3470-01-575-2955
thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
part_name_assigned_by_controlling_agencyHELI-COIL THREAD REPAIR KITS INSERT
NSN5325-01-644-5974
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 5521-16 · 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
•
THREAD LENGTH: 1.50 INCHES NOMINAL IN
•
STYLE DESIGNATOR: COIL
•
THREAD DIRECTION: RIGHT-HAND
•
MATERIAL: STEEL OVERALL
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
TECHNICAL CHARACTERISTICS
THREAD LENGTH1.50 INCHES NOMINAL IN
STYLE DESIGNATORCOIL
THREAD DIRECTIONRIGHT-HAND
SPECIAL FEATURESTHREAD SIZE 1-8 INCHES; INCLUDES DRILL/TAP/TANG REMOVAL IN
PART NAME ASSIGNED BY CONTROLLING AGENCYHELI-COIL THREAD REPAIR KITS INSERT
END ITEM IDENTIFICATION3470-01-575-2955
MATERIALSTEEL OVERALL
THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
OTHER ITEMS IN FSC 5325 — Fastening Devices
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5325-00-000-1884 5325-00-000-9988 5325-00-001-1567 5325-00-001-2043 5325-00-001-3842 5325-00-001-3858 5325-00-001-3871 5325-00-001-4317
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 5521-16?
5521-16 is a INSERT,SCREW THREAD.
What is the NSN for 5521-16?
5521-16 is cataloged in the U.S. Government catalog under NSN 5325-01-644-5974. 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.