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Technical Data Sheet
PartsTable / COMPONENT / 3H2-8-21
3H2-8-21 ✓ 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

TERMINAL JUNCTION BLOCK,SECTIONA. Key specifications include material: STEEL OVERALL, display_type: FULL, overall_length: 32.688 INCHES NOMINAL IN, drive_end_shape: SQUARE SINGLE END EXTERNAL, furnished_items: CASE, special_features: RATCHET HEAD; PLAIN STEEL HANDLE; DUAL SCALE; 0.28 MKG GRADUATIONS. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4720-00-278-1103, 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
3H2-8-21
NSN: 4720-00-278-1103
FSC: 4720
CAGE: 43999 — THE BOEING COMPANY DIV LEGACY AM&M (USA)
SPECIFICATIONS
materialSTEEL OVERALL
display_typeFULL
overall_length32.688 INCHES NOMINAL IN
drive_end_shapeSQUARE SINGLE END EXTERNAL
furnished_itemsCASE
torque_capacity60.0 FOOT-POUNDS MINIMUM AND 300.0 FOOT-POUNDS MAXIMUM AND 10.4 METER-KILOGRAMS MINIMUM AND 43.6 METER-KILOGRAMS MAXIMUM FT
special_featuresRATCHET HEAD; PLAIN STEEL HANDLE; DUAL SCALE; 0.28 MKG GRADUATIONS
style_designatorMICROMETER END DRIVE
surface_treatmentCHROMIUM OVERALL
drive_surface_size0.750 INCHES NOMINAL SINGLE END IN
torque_signal_methodAUDIBLE
end_item_identificationCONTROL WASHE E/I CAGE 01551
NSN4720-00-278-1103
COMPONENT DIAGRAM
PIPE SECTION — SCHEDULE = WALL THICKNESS WALL: — OD: — LENGTH: — — — PN: 3H2-8-21 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 30
QQ-A-200/8Interchangeable
interchangeable cross-reference
interchangeable
472Interchangeable
interchangeable cross-reference
interchangeable
BAC1503-1470Interchangeable
interchangeable cross-reference
interchangeable
60-18Interchangeable
interchangeable cross-reference
interchangeable
ASTM B221Interchangeable
interchangeable cross-reference
interchangeable
QQA200-9Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3H2-8-21?
3H2-8-21 is a TERMINAL JUNCTION BLOCK,SECTIONA.
What parts can replace 3H2-8-21?
There are 30 known substitutes for 3H2-8-21: QQ-A-200/8, 472, BAC1503-1470 and 27 more. Substitute compatibility should be verified for your specific system.
Is 3H2-8-21 still available?
3H2-8-21 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026