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91831A411 — LOCKNUT,TUBE FITTING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

91831A411: LOCKNUT,TUBE FITTING.

The LOCKNUT,TUBE FITTING is a the manufacturer industrial component. Key specifications include locking_feature: PREVAILING TORQUE WITH NONMETALLIC INSERT, nominal_thread_size: 0.1900 INCHES IN, end_item_identification: SQH-4B J-B0X, thread_quantity_per_inch: 32. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-345-5497, 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
91831A411
NSN: 4730-01-345-5497
NIINs: 013455497, 015091545, 015811411
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
locking_featurePREVAILING TORQUE WITH NONMETALLIC INSERT
nominal_thread_size0.1900 INCHES IN
end_item_identificationSQH-4B J-B0X
thread_quantity_per_inch32
NSN4730-01-345-5497
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 91831A411 · 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: STEEL CORROSION RESISTING OVERALL
TECHNICAL CHARACTERISTICS
END ITEM IDENTIFICATIONMRAP - COMMON NSN - USED ON 2 MRAP VARIANTS AND 10 OTHER WEAPON SYSTEMS
MATERIALSTEEL CORROSION RESISTING OVERALL
SUBSTITUTES & CROSS-REFERENCES 2
91832A011Reference document
Same NSN cross-reference
Reference document — Secondary reference
3392AS2732Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 91831A411?
91831A411 is a LOCKNUT,TUBE FITTING.
What parts can replace 91831A411?
There are 2 known substitutes for 91831A411: 91832A011, 3392AS2732. Substitute compatibility should be verified for your specific system.
What is the NSN for 91831A411?
91831A411 is cataloged in the U.S. Government catalog under NSN 4730-01-345-5497. 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.