PartsTable
Technical Data Sheet
Download PDF

5D3-03871-78 — FLANGE,PIPE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

5D3-03871-78: FLANGE,PIPE.

The FLANGE,PIPE is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY, thickness: 0.500 INCHES NOMINAL IN, flange_diameter: 5.000 INCHES NOMINAL IN, style_designator: ROUND, ONE BOLT HOLE CIRCLE, bolt_hole_diameter: 0.406 INCHES NOMINAL IN, bolt_circle_diameter: 2.883 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-407-9372, 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
5D3-03871-78
NSN: 4730-01-407-9372
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 34712 — LAKE SHORE SYSTEMS, INC. (USA)
SPECIFICATIONS
materialNICKEL ALLOY
thickness0.500 INCHES NOMINAL IN
flange_diameter5.000 INCHES NOMINAL IN
style_designatorROUND, ONE BOLT HOLE CIRCLE
bolt_hole_diameter0.406 INCHES NOMINAL IN
bolt_hole_quantity6
bolt_circle_diameter2.883 INCHES NOMINAL IN
flange_section_stylePLAIN FACE
end_item_identificationLAKE SHORE INC, CAPSTAN ASSEMBLY
face_seating_surface_conditionMACHINED
material_document_and_classificationQQ-N-281D, CL A FED SPEC SINGLE MATERIAL RESPONSE
nominal_pipe_size_for_which_designed2.883 INCHES IN
NSN4730-01-407-9372
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 5D3-03871-78 · 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
•
FLANGE DIAMETER: 5.000 INCHES NOMINAL IN
•
FACE SEATING SURFACE CONDITION: MACHINED
•
NOMINAL PIPE SIZE FOR WHICH DESIGNED: 2.883 INCHES IN
•
FLANGE SECTION STYLE: PLAIN FACE
•
STYLE DESIGNATOR: ROUND, ONE BOLT HOLE CIRCLE
•
BOLT HOLE DIAMETER: 0.406 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-N-281D, CL A FED SPEC SINGLE MATERIAL RESPONSE
•
BOLT HOLE QUANTITY: 6
TECHNICAL CHARACTERISTICS
FLANGE DIAMETER5.000 INCHES NOMINAL IN
FACE SEATING SURFACE CONDITIONMACHINED
NOMINAL PIPE SIZE FOR WHICH DESIGNED2.883 INCHES IN
FLANGE SECTION STYLEPLAIN FACE
STYLE DESIGNATORROUND, ONE BOLT HOLE CIRCLE
BOLT HOLE DIAMETER0.406 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-N-281D, CL A FED SPEC SINGLE MATERIAL RESPONSE
BOLT HOLE QUANTITY6
BOLT CIRCLE DIAMETER2.883 INCHES NOMINAL IN
END ITEM IDENTIFICATIONLAKE SHORE INC, CAPSTAN ASSEMBLY
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
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
Ready to buy 5D3-03871-78?
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 5D3-03871-78?
5D3-03871-78 is a FLANGE,PIPE.
What is the NSN for 5D3-03871-78?
5D3-03871-78 is cataloged in the U.S. Government catalog under NSN 4730-01-407-9372. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 5D3-03871-78

✓ 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.