PartsTable
Technical Data Sheet
PartsTable / MRO / 125633
125633 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
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 INVERTED NUT,TUBE COUPLING is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-278-8821, 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
MRO→ MRO_GENERAL→ 125633
NSN: 4730-00-278-8821
FSC: 4730
CAGE: 21450 — ARMY WEAPONS COMMAND ATTN AMSWE-REE-S (USA)
SPECIFICATIONS
Part Number125633
NSN4730-00-278-8821
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 125633 · 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
•
STYLE DESIGNATOR: INVERTED NUT, TUBE, COMPRESSION
•
SMALLEST INSIDE DIAMETER: 0.628 INCHES NOMINAL IN
•
WIDTH ACROSS FLATS: 1.000 INCHES NOMINAL IN
•
MATERIAL: COPPER ALLOY
•
SCREW THREAD SERIES DESIGNATOR: UNS
•
THREAD SIZE: 7/8-18
•
THREAD CLASS: 2A A
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
TECHNICAL CHARACTERISTICS (FLIS)
STYLE DESIGNATORINVERTED NUT, TUBE, COMPRESSION
SMALLEST INSIDE DIAMETER0.628 INCHES NOMINAL IN
WIDTH ACROSS FLATS1.000 INCHES NOMINAL IN
MATERIALCOPPER ALLOY
SCREW THREAD SERIES DESIGNATORUNS
THREAD SIZE7/8-18
THREAD CLASS2A A
CASEHARDENING INDICATORNOT CASEHARDENED
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED0.625 INCHES NOMINAL IN
FABRICATION METHODBAR STOCK, MACHINED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
7703896P2Interchangeable
interchangeable cross-reference
interchangeable
A3D34U265SUB2Interchangeable
interchangeable cross-reference
interchangeable
92W11Interchangeable
interchangeable cross-reference
interchangeable
106058Interchangeable
interchangeable cross-reference
interchangeable
7599104Interchangeable
interchangeable cross-reference
interchangeable
K7810175-120Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 125633?
125633 is a INVERTED NUT,TUBE COUPLING. It is classified as a MRO (MRO_GENERAL).
What parts can replace 125633?
There are 14 known substitutes for 125633: 7703896P2, A3D34U265SUB2, 92W11 and 11 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 125633?
125633 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-278-8821. 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