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4E21557 ✓ Verified by PartsTable
— · PIPE SECTION
WHAT YOU NEED TO KNOW
Schedule = wall thickness, NOT diameter Nominal pipe size != actual OD
Sch 40 and Sch 80 same OD, different wall
PRODUCT OVERVIEW

The TUBE ASSEMBLY,METAL is a the manufacturer industrial component. Key specifications include material: STEEL TUBING, design_form: PREBENT, thread_class: 2B SINGLE END, wall_thickness: 0.062 INCHES NOMINAL IN, special_features: THREADED INTERNAL TUBE TYPE END CONNECTIONS, seat_angle_in_deg: 37.0 SINGLE END. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4710-00-012-2794, 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
4E21557
NSN: 4710-00-012-2794
FSC: 4710
CAGE: 99832 — SCOTT HUBER ESSICK A CO OF FIGGIE INTERNATIONAL INC (USA)
SPECIFICATIONS
materialSTEEL TUBING
design_formPREBENT
thread_class2B SINGLE END
wall_thickness0.062 INCHES NOMINAL IN
special_featuresTHREADED INTERNAL TUBE TYPE END CONNECTIONS
seat_angle_in_deg37.0 SINGLE END
mating_end_quantity2 SINGLE END
nominal_thread_size0.750 INCHES SINGLE END IN
end_connection_styleSWIVEL NUT WITH LOOSE OR INTEGRAL CLINCH SLEEVE SINGLE END
tube_outside_diameter0.750 INCHES NOMINAL IN
thread_series_designatorUNF SINGLE END
NSN4710-00-012-2794
COMPONENT DIAGRAM
PIPE SECTION — SCHEDULE = WALL THICKNESS WALL: — OD: — LENGTH: — — — PN: 4E21557 · OEM ⚠ VERIFY BEFORE ORDERING Schedule = wall thickness, NOT pipe diameter. Sch 40 and Sch 80 have the same OD but different wall thickness. Nominal pipe size ≠ actual OD — a 1" pipe is actually 1.315" OD ✓ BROKER TIP Sch 40 = standard wall, Sch 80 = heavy wall (higher pressure), Sch 160 = extra heavy. Seamless pipe is required for high-pressure applications — welded pipe has lower ratings PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
MATERIAL: STEEL SINGLE END
•
MATING END QUANTITY: 2 SINGLE END
•
END CONNECTION STYLE: SWIVEL NUT WITH LOOSE OR INTEGRAL CLINCH SLEEVE SINGLE END
•
SEAT ANGLE IN DEG: 37.0 SINGLE END
•
THREAD SERIES DESIGNATOR: UNF SINGLE END
•
TUBE OUTSIDE DIAMETER: 0.750 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL SINGLE END
MATING END QUANTITY2 SINGLE END
END CONNECTION STYLESWIVEL NUT WITH LOOSE OR INTEGRAL CLINCH SLEEVE SINGLE END
SEAT ANGLE IN DEG37.0 SINGLE END
THREAD SERIES DESIGNATORUNF SINGLE END
MATERIALSTEEL TUBING
SPECIAL FEATURESTHREADED INTERNAL TUBE TYPE END CONNECTIONS
TUBE OUTSIDE DIAMETER0.750 INCHES NOMINAL IN
DESIGN FORMPREBENT
NOMINAL THREAD SIZE0.750 INCHES SINGLE END IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 2
302529Interchangeable
interchangeable cross-reference
interchangeable
378151Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4E21557?
4E21557 is a TUBE ASSEMBLY,METAL.
What parts can replace 4E21557?
There are 2 known substitutes for 4E21557: 302529, 378151. Substitute compatibility should be verified for your specific system.
What is the NSN for 4E21557?
4E21557 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4710-00-012-2794. 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