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421GC144 — BOLT,FLUID PASSAGE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

421GC144: BOLT,FLUID PASSAGE.

The BOLT,FLUID PASSAGE is a the manufacturer industrial component. Key specifications include body_style: PLAIN, overall_length: 0.938 INCHES NOMINAL IN, width_across_flats: 0.750 INCHES NOMINAL IN, first_end_thread_class: 2A A, wrenching_feature_style: HEXAGON, concentric_hole_diameter: 0.394 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-551-5874, 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
421GC144
NSN: 4730-01-551-5874
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 89619 — MACK TRUCKS, INC. DBA MACUNGIE OPERATIONS DIV LEHIGH VALLEY OPERATIONS (USA)
SPECIFICATIONS
body_stylePLAIN
overall_length0.938 INCHES NOMINAL IN
width_across_flats0.750 INCHES NOMINAL IN
first_end_thread_class2A A
wrenching_feature_styleHEXAGON
concentric_hole_diameter0.394 INCHES NOMINAL IN
cotter_pin_hole_diameter0.125 INCHES NOMINAL IN
first_radial_fluid_hole_diameter0.188 INCHES NOMINAL IN
first_end_thread_quantity_per_inch13
first_end_thread_series_designatorUNIFIED NATIONAL COARSE (UNC)
material_document_and_classificationSAE 1137 OR 1141 ASSN STD SINGLE MATERIAL RESPONSE
distance_from_first_radial_hole_center_to_end_of_bolt0.442 INCHES NOMINAL IN
NSN4730-01-551-5874
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 421GC144 · 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: 0.750 INCHES NOMINAL IN
•
BODY STYLE: PLAIN
•
FIRST END THREAD CLASS: 2A A
•
COTTER PIN HOLE DIAMETER: 0.125 INCHES NOMINAL IN
•
FIRST END THREAD QUANTITY PER INCH: 13
•
WRENCHING FEATURE STYLE: HEXAGON
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE 1137 OR 1141 ASSN STD SINGLE MATERIAL RESPONSE
TECHNICAL CHARACTERISTICS
FIRST END THREAD SERIES DESIGNATORUNIFIED NATIONAL COARSE (UNC)
WIDTH ACROSS FLATS0.750 INCHES NOMINAL IN
BODY STYLEPLAIN
FIRST END THREAD CLASS2A A
COTTER PIN HOLE DIAMETER0.125 INCHES NOMINAL IN
FIRST END THREAD QUANTITY PER INCH13
WRENCHING FEATURE STYLEHEXAGON
MATERIAL DOCUMENT AND CLASSIFICATIONSAE 1137 OR 1141 ASSN STD SINGLE MATERIAL RESPONSE
OVERALL LENGTH0.938 INCHES NOMINAL IN
LENGTH FROM BEARING SURFACE OF WRENCHING FEATURE TO BOLT END0.750 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 421GC144?
421GC144 is a BOLT,FLUID PASSAGE.
What is the NSN for 421GC144?
421GC144 is cataloged in the U.S. Government catalog under NSN 4730-01-551-5874. 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.