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1921B — CYLINDER ASSEMBLY,ACTUATING,LINE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

1921B: CYLINDER ASSEMBLY,ACTUATING,LINE.

CYLINDER ASSEMBLY,ACTUATING,LINE. Key specifications include end_item_identification: JACK 35TON. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-172-0045, 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
1921B
NSN: 4730-00-172-0045
NIINs: 001720045, 010638874, 010880292, 013339061
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 95879 — STEWART-WARNER ALEMITE CORP (USA)
SPECIFICATIONS
end_item_identificationJACK 35TON
NSN4730-00-172-0045
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 1921B · 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
•
WIDTH ACROSS FLATS: 0.438 INCHES NOMINAL IN
•
ASSEMBLY CLEARANCE RADIUS: 0.375 INCHES MAXIMUM IN
•
SHANK LENGTH: 0.312 INCHES NOMINAL IN
•
STYLE DESIGNATOR: ANGLE
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-N-281 CLASS B FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL THREAD SIZE: 0.125 INCHES IN
•
HEIGHT: 1.250 INCHES MAXIMUM IN
•
ANGLE: 30.0 DEGREES
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.438 INCHES NOMINAL IN
ASSEMBLY CLEARANCE RADIUS0.375 INCHES MAXIMUM IN
SHANK LENGTH0.312 INCHES NOMINAL IN
STYLE DESIGNATORANGLE
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-N-281 CLASS B FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD SIZE0.125 INCHES IN
HEIGHT1.250 INCHES MAXIMUM IN
ANGLE30.0 DEGREES
SPECIAL FEATURESSURFACE OR THROAT LOCATED BALL CHECK VALVE
SCREW THREAD SERIES DESIGNATORPTF-SPL SHORT
SUBSTITUTES & CROSS-REFERENCES 7
MS15005-3Reference document
Same NSN cross-reference
Reference document — Secondary reference
AS15005-3Reference document
Same NSN cross-reference
Reference document — Secondary reference
AS35411Reference document
Same NSN cross-reference
Reference document — Secondary reference
MILF3541TYPE5Reference document
Same NSN cross-reference
Reference document — Secondary reference
SAE-AS35411Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
582-6404648-12Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 1921B?
1921B is a CYLINDER ASSEMBLY,ACTUATING,LINE.
What parts can replace 1921B?
There are 7 known substitutes for 1921B: MS15005-3, AS15005-3, AS35411 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1921B?
1921B is cataloged in the U.S. Government catalog under NSN 4730-00-172-0045. This indicates validated use in U.S. government and defense supply chains.
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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.