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R-21375 — INSERT,TUBE FITTING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

R-21375: INSERT,TUBE FITTING.

The INSERT,TUBE FITTING is a the manufacturer industrial component. Key specifications include material: PLASTIC POLYAMIDE NYLON, tube_inside_diameter_for_which_designed: 0.750 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-181-9598, 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
R-21375
NSN: 4730-01-181-9598
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 71724 — JOHN CRANE, INC (USA)
SPECIFICATIONS
materialPLASTIC POLYAMIDE NYLON
tube_inside_diameter_for_which_designed0.750 INCHES NOMINAL IN
NSN4730-01-181-9598
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: R-21375 · 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
•
TUBE INSIDE DIAMETER FOR WHICH DESIGNED: 0.750 INCHES NOMINAL IN
•
MATERIAL: PLASTIC POLYAMIDE NYLON
TECHNICAL CHARACTERISTICS
TUBE INSIDE DIAMETER FOR WHICH DESIGNED0.750 INCHES NOMINAL IN
MATERIALPLASTIC POLYAMIDE NYLON
SUBSTITUTES & CROSS-REFERENCES 3
PACK4535001P658Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
CS-4730-SV-0729Reference document
Same NSN cross-reference
Reference document — Secondary reference
4730PL1326131Reference document
Same NSN cross-reference
Reference document — Informative reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is R-21375?
R-21375 is a INSERT,TUBE FITTING.
What parts can replace R-21375?
There are 3 known substitutes for R-21375: PACK4535001P658, CS-4730-SV-0729, 4730PL1326131. Substitute compatibility should be verified for your specific system.
What is the NSN for R-21375?
R-21375 is cataloged in the U.S. Government catalog under NSN 4730-01-181-9598. 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.