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616781 — TUBE,METALLIC

✓ Government record, cited
— · BOLT SCREW
PRODUCT OVERVIEW

616781: TUBE,METALLIC.

The TUBE,METALLIC is a the manufacturer industrial component. Key specifications include diameter: 0.625 INCHES NOMINAL IN, material: STEEL COMP 1020, construction: SEAMLESS, wall_thickness: 0.130 INCHES NOMINAL IN, first_end_style: PLAIN, end_item_identification: 3930-01-384-5310. This part is cataloged in the U.S.

Government catalog under NSN 5305-00-044-7079, 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
616781
NSN: 5305-00-044-7079
NIINs: 000447079, 014159471
FSC: 5305 — Screws
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
diameter0.625 INCHES NOMINAL IN
materialSTEEL COMP 1020
constructionSEAMLESS
wall_thickness0.130 INCHES NOMINAL IN
first_end_stylePLAIN
end_item_identification3930-01-384-5310
cross-sectional_shape_stylePLAIN ROUND
measuring_method_and_length0.250 INCHES NOMINAL SPECIFIC IN
second_end_relationship_with_first_endIDENTICAL
NSN5305-00-044-7079
COMPONENT DIAGRAM
BOLT / SCREW — THREAD VERIFICATION REQUIRED Hex HEAD LENGTH: — THREAD: — × — MATERIAL: — PN: 616781 · 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
•
SURFACE FINISH: 32.0 MICROINCHES THREADS
•
WIDTH ACROSS FLATS: 0.141 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
•
HEAD HEIGHT: 0.159 INCHES MINIMUM AND 0.164 INCHES MAXIMUM IN
•
FASTENER LENGTH: 0.234 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN
•
THREAD LENGTH: 0.172 INCHES MINIMUM AND 0.204 INCHES MAXIMUM IN
•
HOLE CONFIGURATION STYLE: ROUND INTERNAL HEXAGON
TECHNICAL CHARACTERISTICS
SURFACE FINISH32.0 MICROINCHES THREADS
SURFACE FINISH125.0 MICROINCHES TOP OF HEAD
SURFACE FINISH63.0 MICROINCHES BEARING SURFACE OF HEAD
WIDTH ACROSS FLATS0.141 INCHES MINIMUM AND 0.143 INCHES MAXIMUM IN
HEAD HEIGHT0.159 INCHES MINIMUM AND 0.164 INCHES MAXIMUM IN
FASTENER LENGTH0.234 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN
THREAD LENGTH0.172 INCHES MINIMUM AND 0.204 INCHES MAXIMUM IN
HOLE CONFIGURATION STYLEROUND INTERNAL HEXAGON
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5637 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER0.164 INCHES IN
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 616781?
616781 is a TUBE,METALLIC.
What is the NSN for 616781?
616781 is cataloged in the U.S. Government catalog under NSN 5305-00-044-7079. 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.