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Technical Data Sheet
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159B821 — Technical Data Sheet

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— · 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 CAP,TUBE is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, seat_angle: 37.0 DEGREES, thread_class: 2B INTERNAL, connection_style: FLARE, style_designator: CAP, thread_direction: RIGHT-HAND INTERNAL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System under NSN 4730-00-950-8827, 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
159B821
NSN: 4730-00-950-8827
FSC: 4730
CAGE: 44940 — CUMMINS POWER GENERATION INC. (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
seat_angle37.0 DEGREES
thread_class2B INTERNAL
connection_styleFLARE
style_designatorCAP
thread_directionRIGHT-HAND INTERNAL
features_providedSCREW AND CHAIN ASSEMBLY
nominal_thread_size0.500 INCHES INTERNAL IN
thread_series_designatorUNF INTERNAL
material_document_and_classificationASTM B16-A ASSN STD SINGLE MATERIAL RESPONSE OVERALL
tube_outside_diameter_for_which_designed0.312 INCHES NOMINAL IN
NSN4730-00-950-8827
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 159B821 · 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
•
CONNECTION STYLE: FLARE
•
THREAD CLASS: 2B INTERNAL
•
SEAT ANGLE: 37.0 DEGREES
•
NOMINAL THREAD SIZE: 0.500 INCHES INTERNAL IN
•
THREAD SERIES DESIGNATOR: UNF INTERNAL
•
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED: 0.312 INCHES NOMINAL IN
•
FEATURES PROVIDED: SCREW AND CHAIN ASSEMBLY
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM B16-A ASSN STD SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS
CONNECTION STYLEFLARE
THREAD CLASS2B INTERNAL
SEAT ANGLE37.0 DEGREES
NOMINAL THREAD SIZE0.500 INCHES INTERNAL IN
THREAD SERIES DESIGNATORUNF INTERNAL
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED0.312 INCHES NOMINAL IN
FEATURES PROVIDEDSCREW AND CHAIN ASSEMBLY
MATERIAL DOCUMENT AND CLASSIFICATIONASTM B16-A ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATERIALCOPPER ALLOY OVERALL
STYLE DESIGNATORCAP
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
158511R1InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
159821InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
13211E6751InterchangeableGOVERNMENT REGISTRY
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 159B821?
159B821 is a CAP,TUBE.
What parts can replace 159B821?
There are 3 known substitutes for 159B821: 158511R1, 159821, 13211E6751. Substitute compatibility should be verified for your specific system.
What is the NSN for 159B821?
159B821 is cataloged in the Federal Logistics Information System under NSN 4730-00-950-8827. 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: October 2026