PartsTable
Technical Data Sheet
PartsTable / COMPONENT / 12521-1
12521-1 ✓ Verified by PartsTable
— · BOLT SCREW
WHAT YOU NEED TO KNOW
Grade/class stamped on head determines strength Metric and imperial threads look similar — measure pitch
Verify thread pitch — metric != imperial
PRODUCT OVERVIEW

The TUBE ASSEMBLY,BLEED is a the manufacturer industrial component. Key specifications include head_style: FILLISTER, head_height: 0.124 INCHES NOMINAL IN, thread_class: 3A A, head_diameter: 0.304 INCHES NOMINAL IN, thread_length: 0.750 INCHES MAXIMUM IN, screw_material: STEEL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5305-00-286-8964, 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
12521-1
NSN: 5305-00-286-8964
FSC: 5305
CAGE: 57712 — TELEMECHANICS INC (USA)
SPECIFICATIONS
head_styleFILLISTER
head_height0.124 INCHES NOMINAL IN
thread_class3A A
head_diameter0.304 INCHES NOMINAL IN
thread_length0.750 INCHES MAXIMUM IN
screw_materialSTEEL
fastener_length0.750 INCHES NOMINAL IN
thread_directionRIGHT-HAND
features_providedCASEHARDENED
internal_drive_styleCROSS RECESS TYPE 1
nominal_thread_diameter0.190 INCHES IN
screw_surface_treatmentZINC
NSN5305-00-286-8964
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 12521-1 · 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
•
FASTENER LENGTH: 0.750 INCHES NOMINAL IN
•
SCREW MATERIAL: STEEL
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD LENGTH: 0.750 INCHES MAXIMUM IN
•
HEAD DIAMETER: 0.304 INCHES NOMINAL IN
•
HEAD HEIGHT: 0.124 INCHES NOMINAL IN
•
SCREW SURFACE TREATMENT: ZINC
•
THREAD SERIES DESIGNATOR: UNS
TECHNICAL CHARACTERISTICS (FLIS)
FASTENER LENGTH0.750 INCHES NOMINAL IN
SCREW MATERIALSTEEL
THREAD DIRECTIONRIGHT-HAND
THREAD LENGTH0.750 INCHES MAXIMUM IN
HEAD DIAMETER0.304 INCHES NOMINAL IN
HEAD HEIGHT0.124 INCHES NOMINAL IN
SCREW SURFACE TREATMENTZINC
THREAD SERIES DESIGNATORUNS
INTERNAL DRIVE STYLECROSS RECESS TYPE 1
THREAD QUANTITY PER INCH40
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
209-070-464-1Interchangeable
interchangeable cross-reference
interchangeable
12521-1Interchangeable
interchangeable cross-reference
interchangeable
04964323Interchangeable
interchangeable cross-reference
interchangeable
PF-312Interchangeable
interchangeable cross-reference
interchangeable
79000808Interchangeable
interchangeable cross-reference
interchangeable
33344Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
Ready to buy 12521-1?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 12521-1?
12521-1 is a TUBE ASSEMBLY,BLEED.
What parts can replace 12521-1?
There are 7 known substitutes for 12521-1: 209-070-464-1, 12521-1, 04964323 and 4 more. Substitute compatibility should be verified for your specific system.
Is 12521-1 still available?
12521-1 is currently cancelled.
Community Feedback
Comments (0)
No comments yet. Be the first to share what you know.
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 12521-1

✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026