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840-FS-04 — SLEEVE,FLARED,TUBE FITTING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

840-FS-04: SLEEVE,FLARED,TUBE FITTING.

The SLEEVE,FLARED,TUBE FITTING is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1015 OR STEEL COMP 1020 OR STEEL COMP 1137 OR STEEL COMP 1141 OR STEEL COMP 12L14 OR STEEL COMP 11L37, flange_width: 0.140 INCHES NOMINAL IN, overall_length: 0.410 INCHES NOMINAL IN, style_designator: SLEEVE, seat_angle_in_deg: 33.0, surface_treatment: CADMIUM. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-043-6300, 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
840-FS-04
NSN: 4730-01-043-6300
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 30327 — IMPERIAL (USA)
SPECIFICATIONS
materialSTEEL COMP 1015 OR STEEL COMP 1020 OR STEEL COMP 1137 OR STEEL COMP 1141 OR STEEL COMP 12L14 OR STEEL COMP 11L37
flange_width0.140 INCHES NOMINAL IN
overall_length0.410 INCHES NOMINAL IN
style_designatorSLEEVE
seat_angle_in_deg33.0
surface_treatmentCADMIUM
casehardening_indicatorNOT CASEHARDENED
flange_outside_diameter0.383 INCHES NOMINAL IN
sleeve_outside_diameter0.255 INCHES NOMINAL IN
metallic_hardness_rating70.0 NOMINAL ROCKWELL B
hose/tube_outside_diameter_for_which_designed0.250 INCHES NOMINAL IN
NSN4730-01-043-6300
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 840-FS-04 · 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
•
SEAT ANGLE IN DEG: 33.0
•
STYLE DESIGNATOR: SLEEVE
•
MATERIAL DOCUMENT AND CLASSIFICATION: FED STD 66, COMP 1137 FED STD 3RD MATERIAL RESPONSE OR FED STD 66, COMP 1141 FED STD 4TH MATERIAL RESPONSE OR FED STD 66, COMP 12L14 FED STD 5TH MATERIAL RESPONSE OR FED STD 66,COMP 11L37 FED STD 6TH MATERIAL RESPONSE
•
SLEEVE OUTSIDE DIAMETER: 0.255 INCHES NOMINAL IN
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
SURFACE TREATMENT: CADMIUM
•
FLANGE WIDTH: 0.140 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
SEAT ANGLE IN DEG33.0
STYLE DESIGNATORSLEEVE
MATERIAL DOCUMENT AND CLASSIFICATIONFED STD 66, COMP 1137 FED STD 3RD MATERIAL RESPONSE OR FED STD 66, COMP 1141 FED STD 4TH MATERIAL RESPONSE OR FED STD 66, COMP 12L14 FED STD 5TH MATERIAL RESPONSE OR FED STD 66,COMP 11L37 FED STD 6TH MATERIAL RESPONSE
OVERALL LENGTH0.410 INCHES NOMINAL IN
SLEEVE OUTSIDE DIAMETER0.255 INCHES NOMINAL IN
CASEHARDENING INDICATORNOT CASEHARDENED
SURFACE TREATMENTCADMIUM
FLANGE WIDTH0.140 INCHES NOMINAL IN
MATERIALSTEEL COMP 1015 OR STEEL COMP 1020 OR STEEL COMP 1137 OR STEEL COMP 1141 OR STEEL COMP 12L14 OR STEEL COMP 11L37
FLANGE OUTSIDE DIAMETER0.383 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 8
MS51533B4Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
MS51533-4Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
4730PL0977390Reference document
Same NSN cross-reference
Reference document — Informative reference only
MS51533Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
80JX604Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
MS51533-84Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 840-FS-04?
840-FS-04 is a SLEEVE,FLARED,TUBE FITTING.
What parts can replace 840-FS-04?
There are 8 known substitutes for 840-FS-04: MS51533B4, MS51533-4, 4730PL0977390 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 840-FS-04?
840-FS-04 is cataloged in the U.S. Government catalog under NSN 4730-01-043-6300. 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.