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FTP7138-8A-4 — SCREW,MACHINE

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

FTP7138-8A-4: SCREW,MACHINE.

The SCREW,MACHINE is a the manufacturer industrial component. Key specifications include head_style: ROUND EXTENDED WASHER, head_height: 0.110 INCHES NOMINAL IN, thread_class: 3A A, head_diameter: 0.315 INCHES NOMINAL IN, thread_length: 0.250 INCHES NOMINAL IN, screw_material: STEEL COMP 8740. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-653-3364, 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
FTP7138-8A-4
NSN: 5305-01-653-3364
FSC: 5305 — Screws
CAGE: 58794 — FASTENER TECHNOLOGY CORP (USA)
SPECIFICATIONS
head_styleROUND EXTENDED WASHER
head_height0.110 INCHES NOMINAL IN
thread_class3A A
head_diameter0.315 INCHES NOMINAL IN
thread_length0.250 INCHES NOMINAL IN
screw_materialSTEEL COMP 8740
fastener_length0.660 INCHES NOMINAL IN
thread_directionRIGHT-HAND
internal_drive_styleCROSS RECESS TYPE II
nominal_thread_diameter0.1640 INCHES IN
extended_washer_diameter0.315 INCHES NOMINAL IN
thread_quantity_per_inch32
NSN5305-01-653-3364
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: FTP7138-8A-4 · 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
•
EXTENDED WASHER THICKNESS: 0.015 INCHES MINIMUM AND 0.025 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.110 INCHES NOMINAL IN
•
FASTENER LENGTH: 0.660 INCHES NOMINAL IN
•
EXTENDED WASHER DIAMETER: 0.315 INCHES NOMINAL IN
•
THREAD LENGTH: 0.250 INCHES NOMINAL IN
•
NOMINAL THREAD DIAMETER: 0.1640 INCHES IN
•
HEAD STYLE: ROUND EXTENDED WASHER
•
THREAD DIRECTION: RIGHT-HAND
TECHNICAL CHARACTERISTICS
EXTENDED WASHER THICKNESS0.015 INCHES MINIMUM AND 0.025 INCHES MAXIMUM IN
HEAD HEIGHT0.110 INCHES NOMINAL IN
FASTENER LENGTH0.660 INCHES NOMINAL IN
EXTENDED WASHER DIAMETER0.315 INCHES NOMINAL IN
THREAD LENGTH0.250 INCHES NOMINAL IN
NOMINAL THREAD DIAMETER0.1640 INCHES IN
HEAD STYLEROUND EXTENDED WASHER
THREAD DIRECTIONRIGHT-HAND
SCREW MATERIALSTEEL COMP 8740
INTERNAL DRIVE STYLECROSS RECESS TYPE II
OTHER ITEMS IN FSC 5305 — Screws
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5305-00-000-0094 5305-00-000-1397 5305-00-000-2625 5305-00-000-3669 5305-00-000-3830 5305-00-000-3831
SUBSTITUTES & CROSS-REFERENCES 1
HS4103-8A-4Reference 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 FTP7138-8A-4?
FTP7138-8A-4 is a SCREW,MACHINE.
What parts can replace FTP7138-8A-4?
There is 1 known substitute for FTP7138-8A-4: HS4103-8A-4. Substitute compatibility should be verified for your specific system.
What is the NSN for FTP7138-8A-4?
FTP7138-8A-4 is cataloged in the U.S. Government catalog under NSN 5305-01-653-3364. 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.