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Technical Data Sheet
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3B7881 ✓ 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 BEARING,BALL,ANNULAR is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY 230 OVERALL, connection_type: THREADED EXTERNAL PIPE ALL ENDS, connection_style: PLAIN (PIPE) ALL ENDS, style_designator: SHORT, operating_pressure: 125.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS, nominal_thread_size: 0.500 INCHES ALL ENDS IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-193-2713, 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
3B7881
NSN: 4730-00-193-2713
FSC: 4730
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
materialCOPPER ALLOY 230 OVERALL
connection_typeTHREADED EXTERNAL PIPE ALL ENDS
connection_stylePLAIN (PIPE) ALL ENDS
style_designatorSHORT
operating_pressure125.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size0.500 INCHES ALL ENDS IN
nominal_overall_length1.500 INCHES IN
thread_series_designatorNPT ALL ENDS
nondefinitive_spec/std_data2 TABLE
specification/standard_data81346-ASTMB687 GOVERNMENT SPECIFICATION AND 96906-MS51846 GOVERNMENT STANDARD
material_document_and_classificationASTM B43 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
pipe_wall_thickness_designation_for_which_designedSCHEDULE XS ALL ENDS
NSN4730-00-193-2713
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 3B7881 · 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
•
NONDEFINITIVE SPEC/STD DATA: 2 TABLE
•
PIPE WALL THICKNESS DESIGNATION FOR WHICH DESIGNED: SCHEDULE XS ALL ENDS
•
SPECIFICATION/STANDARD DATA: 81346-ASTMB687 GOVERNMENT SPECIFICATION AND 96906-MS51846 GOVERNMENT STANDARD
•
MATERIAL: COPPER ALLOY 230 OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM B43 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
STYLE DESIGNATOR: SHORT
•
NOMINAL THREAD SIZE: 0.500 INCHES ALL ENDS IN
TECHNICAL CHARACTERISTICS (FLIS)
NONDEFINITIVE SPEC/STD DATA2 TABLE
PIPE WALL THICKNESS DESIGNATION FOR WHICH DESIGNEDSCHEDULE XS ALL ENDS
SPECIFICATION/STANDARD DATA81346-ASTMB687 GOVERNMENT SPECIFICATION AND 96906-MS51846 GOVERNMENT STANDARD
MATERIALCOPPER ALLOY 230 OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONASTM B43 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONASTM B43 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
STYLE DESIGNATORSHORT
NOMINAL THREAD SIZE0.500 INCHES ALL ENDS IN
OPERATING PRESSURE125.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
THREAD SERIES DESIGNATORNPT ALL ENDS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
191032Interchangeable
interchangeable cross-reference
interchangeable
8694464Interchangeable
interchangeable cross-reference
interchangeable
177605Interchangeable
interchangeable cross-reference
interchangeable
19836Interchangeable
interchangeable cross-reference
interchangeable
120128Interchangeable
interchangeable cross-reference
interchangeable
OASIS 276Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3B7881?
3B7881 is a BEARING,BALL,ANNULAR.
What parts can replace 3B7881?
There are 17 known substitutes for 3B7881: 191032, 8694464, 177605 and 14 more. Substitute compatibility should be verified for your specific system.
Is 3B7881 still available?
3B7881 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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Last verified: July 2026