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Technical Data Sheet
PartsTable / COMPONENT / 51-21F
51-21F ✓ Verified by PartsTable
— · HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

The ELBOW,FLANGE TO PIPE is a the manufacturer industrial component. Key specifications include length: 0.320 INCHES NOMINAL IN, material: RUBBER, overall_width: 0.180 INCHES NOMINAL IN, physical_form: SOLID, overall_height: 0.320 INCHES NOMINAL IN, base_flange_thickness: 0.062 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-235-1413, 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
51-21F
NSN: 4730-01-235-1413
FSC: 4730
CAGE: 34466 — AMERICAN REELING DEVICES INC. (USA)
SPECIFICATIONS
length0.320 INCHES NOMINAL IN
materialRUBBER
overall_width0.180 INCHES NOMINAL IN
physical_formSOLID
overall_height0.320 INCHES NOMINAL IN
base_flange_thickness0.062 INCHES NOMINAL IN
end_item_identification6920-01-085-8514
environmental_protectionWARP/TWIST
right_side_flange_height0.258 INCHES NOMINAL IN
left-side_flange_tip_styleLEFT SQUARE END
left_side_flange_thickness0.047 INCHES NOMINAL IN
cross-sectional_shape_styleOPEN CHANNEL
NSN4730-01-235-1413
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 51-21F · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
5006S25Interchangeable
interchangeable cross-reference
interchangeable
294Interchangeable
interchangeable cross-reference
interchangeable
4284P11Interchangeable
interchangeable cross-reference
interchangeable
A362X29Interchangeable
interchangeable cross-reference
interchangeable
1751M1Interchangeable
interchangeable cross-reference
interchangeable
B1303-4-294Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 51-21F?
51-21F is a ELBOW,FLANGE TO PIPE.
What parts can replace 51-21F?
There are 21 known substitutes for 51-21F: 5006S25, 294, 4284P11 and 18 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 51-21F?
51-21F is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-235-1413. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026