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Technical Data Sheet
PartsTable / COMPONENT / 3-78045-2-40
3-78045-2-40 ✓ Verified by PartsTable
— · HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

The FLANGE,PIPE,SWIVEL RETAINING is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY, thickness: 0.810 INCHES NOMINAL IN, flange_diameter: 5.560 INCHES NOMINAL IN, style_designator: ROUND, ONE BOLT HOLE CIRCLE, bolt_hole_diameter: 0.690 INCHES NOMINAL IN, bolt_circle_diameter: 4.440 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-903-8642, 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
3-78045-2-40
NSN: 4730-00-903-8642
FSC: 4730
CAGE: 01276 — DANFOSS POWER SOLUTIONS II, LLC (USA)
SPECIFICATIONS
materialCOPPER ALLOY
thickness0.810 INCHES NOMINAL IN
flange_diameter5.560 INCHES NOMINAL IN
style_designatorROUND, ONE BOLT HOLE CIRCLE
bolt_hole_diameter0.690 INCHES NOMINAL IN
bolt_hole_quantity6
bolt_circle_diameter4.440 INCHES NOMINAL IN
flange_section_stylePLAIN FACE
nondefinitive_spec/std_dataEF TYPE
specification/standard_data81349-MIL-F-20042 GOVERNMENT SPECIFICATION
face_seating_surface_conditionMACHINED
material_document_and_classificationQQ-C-390 FED SPEC SINGLE MATERIAL RESPONSE
NSN4730-00-903-8642
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 3-78045-2-40 · 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
•
MATERIAL: COPPER ALLOY
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-C-390 FED SPEC SINGLE MATERIAL RESPONSE
•
NONDEFINITIVE SPEC/STD DATA: EF TYPE
•
STYLE DESIGNATOR: ROUND, ONE BOLT HOLE CIRCLE
•
OPERATING PRESSURE AND TYPE: 250.0 POUNDS PER SQUARE INCH (PSI) GAS MAXIMUM REQUIRED AND 250.0 POUNDS PER SQUARE INCH (PSI) OIL MAXIMUM REQUIRED AND 250.0 POUNDS PER SQUARE INCH (PSI) STEAM MAXIMUM REQUIRED AND 250.0 POUNDS PER SQUARE INCH (PSI) WATER MAXIMUM REQUIRED LBS
•
MAXIMUM OPERATING TEMP AND MEDIA FOR WHICH DESIGNED: 425.0 FAHRENHEIT GAS AND 425.0 FAHRENHEIT OIL AND 425.0 FAHRENHEIT STEAM AND 425.0 FAHRENHEIT WATER DEGF
•
SPECIFICATION/STANDARD DATA: 81349-MIL-F-20042 GOVERNMENT SPECIFICATION
•
THICKNESS: 0.810 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALCOPPER ALLOY
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-C-390 FED SPEC SINGLE MATERIAL RESPONSE
NONDEFINITIVE SPEC/STD DATAEF TYPE
STYLE DESIGNATORROUND, ONE BOLT HOLE CIRCLE
OPERATING PRESSURE AND TYPE250.0 POUNDS PER SQUARE INCH (PSI) GAS MAXIMUM REQUIRED AND 250.0 POUNDS PER SQUARE INCH (PSI) OIL MAXIMUM REQUIRED AND 250.0 POUNDS PER SQUARE INCH (PSI) STEAM MAXIMUM REQUIRED AND 250.0 POUNDS PER SQUARE INCH (PSI) WATER MAXIMUM REQUIRED LBS
MAXIMUM OPERATING TEMP AND MEDIA FOR WHICH DESIGNED425.0 FAHRENHEIT GAS AND 425.0 FAHRENHEIT OIL AND 425.0 FAHRENHEIT STEAM AND 425.0 FAHRENHEIT WATER DEGF
SPECIFICATION/STANDARD DATA81349-MIL-F-20042 GOVERNMENT SPECIFICATION
THICKNESS0.810 INCHES NOMINAL IN
BOLT HOLE QUANTITY6
NOMINAL PIPE SIZE FOR WHICH DESIGNED2.000 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
C15898Interchangeable
interchangeable cross-reference
interchangeable
NAS907Interchangeable
interchangeable cross-reference
interchangeable
45 3780Interchangeable
interchangeable cross-reference
interchangeable
MIL-F-20042Interchangeable
Same NIIN cross-reference
interchangeable
3-74045-2-40Interchangeable
Same NIIN cross-reference
interchangeable
3-78045Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3-78045-2-40?
3-78045-2-40 is a FLANGE,PIPE,SWIVEL RETAINING.
What parts can replace 3-78045-2-40?
There are 6 known substitutes for 3-78045-2-40: C15898, NAS907, 45 3780 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 3-78045-2-40?
3-78045-2-40 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-903-8642. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026