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8B1641 — BOLT,FLUID PASSAGE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

8B1641: BOLT,FLUID PASSAGE.

The BOLT,FLUID PASSAGE is a the manufacturer industrial component. Key specifications include material: STEEL, body_style: RELIEVED, overall_length: 1.448 INCHES NOMINAL IN, width_across_flats: 0.753 INCHES NOMINAL IN, concentric_hole_depth: 1.105 INCHES NOMINAL IN, first_end_thread_class: 2A A. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-424-0328, 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
8B1641
NSN: 4730-00-424-0328
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
materialSTEEL
body_styleRELIEVED
overall_length1.448 INCHES NOMINAL IN
width_across_flats0.753 INCHES NOMINAL IN
concentric_hole_depth1.105 INCHES NOMINAL IN
first_end_thread_class2A A
first_end_thread_length0.625 INCHES NOMINAL IN
wrenching_feature_styleHEXAGON
concentric_hole_diameter0.187 INCHES NOMINAL IN
wrenching_feature_height0.225 INCHES NOMINAL IN
first_end_connection_typeTHREADED EXTERNAL TUBE
first_end_style_designatorPLAIN
NSN4730-00-424-0328
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 8B1641 · OEM ⚠ VERIFY BEFORE ORDERING NPT ≠ BSPT — tapered threads look identical but are NOT interchangeable. Wrong thread = leak. JIC (37°) ≠ AN (37°) ≠ SAE 45° — flare angles must match exactly. Measure thread pitch with gauge — visual identification is unreliable ✓ BROKER TIP Always use thread sealant (PTFE tape or pipe compound) on tapered threads (NPT/BSPT). JIC/AN flare fittings seal metal-to-metal — never use tape on flare connections PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
FIRST END THREAD SERIES DESIGNATOR: UNIFIED NATIONAL COARSE (UNC)
•
WIDTH ACROSS FLATS: 0.753 INCHES NOMINAL IN
•
FIRST END THREAD DIRECTION: RIGHT-HAND
•
LENGTH FROM BEARING SURFACE OF WRENCHING FEATURE TO END OF FIRST DIAMETER: 0.185 INCHES NOMINAL IN
•
BODY STYLE: RELIEVED
•
FIRST END THREAD CLASS: 2A A
•
FIRST END STYLE DESIGNATOR: PLAIN
•
SECOND DIAMETER FROM WRENCHING FEATURE: 0.437 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
FIRST END THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
WIDTH ACROSS FLATS0.753 INCHES NOMINAL IN
FIRST END THREAD DIRECTIONRIGHT-HAND
LENGTH FROM BEARING SURFACE OF WRENCHING FEATURE TO END OF FIRST DIAMETER0.185 INCHES NOMINAL IN
BODY STYLERELIEVED
FIRST END THREAD CLASS2A A
FIRST END STYLE DESIGNATORPLAIN
SECOND DIAMETER FROM WRENCHING FEATURE0.437 INCHES NOMINAL IN
CONCENTRIC HOLE DEPTH1.105 INCHES NOMINAL IN
WRENCHING FEATURE HEIGHT0.225 INCHES NOMINAL IN
OTHER ITEMS IN FSC 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4730-00-000-1895 4730-00-000-4289 4730-00-000-4445 4730-00-000-8373 4730-00-000-8897 4730-00-001-0007 4730-00-001-0008
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 8B1641?
8B1641 is a BOLT,FLUID PASSAGE.
What is the NSN for 8B1641?
8B1641 is cataloged in the U.S. Government catalog under NSN 4730-00-424-0328. 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.