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18-91B — TUBE,BENT,METALLIC

✓ Government record, cited
— · PIPE SECTION
PRODUCT OVERVIEW

18-91B: TUBE,BENT,METALLIC.

The TUBE,BENT,METALLIC is a the manufacturer industrial component. This part is cataloged in the U.S. Government catalog under NSN 4710-01-237-3408, 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
18-91B
NSN: 4710-01-237-3408
FSC: 4710 — Pipe, Tube and Rigid Tubing
CAGE: 58366 — KIRBY MORGAN DIVE SYSTEMS INC (USA)
SPECIFICATIONS
Part Number18-91B
NSN4710-01-237-3408
COMPONENT DIAGRAM
PIPE SECTION — SCHEDULE = WALL THICKNESS WALL: — OD: — LENGTH: — — — PN: 18-91B · OEM ⚠ VERIFY BEFORE ORDERING Schedule = wall thickness, NOT pipe diameter. Sch 40 and Sch 80 have the same OD but different wall thickness. Nominal pipe size ≠ actual OD — a 1" pipe is actually 1.315" OD ✓ BROKER TIP Sch 40 = standard wall, Sch 80 = heavy wall (higher pressure), Sch 160 = extra heavy. Seamless pipe is required for high-pressure applications — welded pipe has lower ratings PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
OTHER ITEMS IN FSC 4710 — Pipe, Tube and Rigid Tubing
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4710-00-001-0080 4710-00-001-0081 4710-00-001-0082 4710-00-001-1229 4710-00-001-1676 4710-00-001-1686 4710-00-001-1688 4710-00-001-1691
SUBSTITUTES & CROSS-REFERENCES 5
D6817Reference document
Same NSN cross-reference
Reference document — Secondary reference
17-032BReference document
Same NSN cross-reference
Reference document — Secondary reference
DE039Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
9147Y160Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
592-6318364Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 18-91B?
18-91B is a TUBE,BENT,METALLIC.
What parts can replace 18-91B?
There are 5 known substitutes for 18-91B: D6817, 17-032B, DE039 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 18-91B?
18-91B is cataloged in the U.S. Government catalog under NSN 4710-01-237-3408. 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.