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91056-991 — CLAMP,HOSE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

91056-991: CLAMP,HOSE.

The CLAMP,HOSE is a the manufacturer industrial component. Key specifications include head_style: FLAT COUNTERSUNK, thread_class: 2A A, head_diameter: 0.101 INCHES MINIMUM AND 0.119 INCHES MAXIMUM IN, thread_length: 0.250 INCHES NOMINAL IN, screw_material: STEEL COMP 302 OR STEEL COMP 303SE OR STEEL COMP 304 OR STEEL COMP 316, fastener_length: 0.250 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-305-8382, 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
91056-991
NSN: 4730-01-305-8382
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 076M6 — AMZ ALABAMA INC. (USA)
SPECIFICATIONS
head_styleFLAT COUNTERSUNK
thread_class2A A
head_diameter0.101 INCHES MINIMUM AND 0.119 INCHES MAXIMUM IN
thread_length0.250 INCHES NOMINAL IN
screw_materialSTEEL COMP 302 OR STEEL COMP 303SE OR STEEL COMP 304 OR STEEL COMP 316
fastener_length0.250 INCHES NOMINAL IN
thread_directionRIGHT-HAND
countersink_angle80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM
internal_drive_styleSLOT
nominal_thread_diameter0.060 INCHES IN
screw_surface_treatmentPASSIVATE
thread_quantity_per_inch80
NSN4730-01-305-8382
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 91056-991 · 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
SUBSTITUTES & CROSS-REFERENCES 5
25292031Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
25292031-111Reference document
Same NSN cross-reference
Reference document — Secondary reference
441-8940Reference document
Same NSN cross-reference
Reference document — Informative reference only
HE011324Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
011324Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 91056-991?
91056-991 is a CLAMP,HOSE.
What parts can replace 91056-991?
There are 5 known substitutes for 91056-991: 25292031, 25292031-111, 441-8940 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 91056-991?
91056-991 is cataloged in the U.S. Government catalog under NSN 4730-01-305-8382. 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.