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B1639 — PRINTED WIRING BOARD

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

B1639: PRINTED WIRING BOARD.

The PRINTED WIRING BOARD is a the manufacturer industrial component. Key specifications include material: IRON ALLOY OVERALL, seat_type: GROUND-JOINT, reducer_type: CONCENTRIC, usage_design: FOR HISTOLOGIC FIXATIVE, connection_type: THREADED INTERNAL PIPE SECOND END, connection_style: PLAIN (PIPE) ALL ENDS. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-092-9670, 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
B1639
NSN: 4730-00-092-9670
NIINs: 000929670, 001892598, 001892599, 001892602, 001892606, 001892615, 001892619, 001892625, 001892627, 001892628, 001892629, 001892632, 001892633, 001892634, 001892635, 001892638, 001892639, 001892645, 001892646, 002043392, 002237078, 002237079, 002401672, 002401674, 002401678, 002489357, 002663905, 002870132, 002870140, 002870154, 004766444, 005952568, 013066280, 013605691
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 05047 — THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS (USA)
SPECIFICATIONS
materialIRON ALLOY OVERALL
seat_typeGROUND-JOINT
reducer_typeCONCENTRIC
usage_designFOR HISTOLOGIC FIXATIVE
connection_typeTHREADED INTERNAL PIPE SECOND END
connection_stylePLAIN (PIPE) ALL ENDS
special_featuresC/O FORMALDYHYDE SOLUTION,GLACIAL ACETIC ACID,AND SATURATED SOLUTION OF PICRIC ACID
style_designatorSCREWED
surface_treatmentZINC OVERALL
operating_pressure250.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size1.250 INCHES SECOND END IN
coupling_flange_shapeHEXAGON
NSN4730-00-092-9670
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: B1639 · 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
•
NOMINAL PIPE SIZE ACCOMMODATED: 0.250 INCHES ALL ENDS IN
•
CONNECTION STYLE: PLAIN (PIPE) ALL ENDS
•
COUPLING FLANGE SHAPE: HEXAGON
•
NOMINAL OVERALL LENGTH: 1.625 INCHES IN
•
STYLE DESIGNATOR: SCREWED
•
OPERATING PRESSURE: 500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
•
SEAT TYPE: GROUND-JOINT
•
NOMINAL THREAD SIZE: 0.250 INCHES ALL ENDS IN
TECHNICAL CHARACTERISTICS
NOMINAL PIPE SIZE ACCOMMODATED0.250 INCHES ALL ENDS IN
CONNECTION STYLEPLAIN (PIPE) ALL ENDS
COUPLING FLANGE SHAPEHEXAGON
NOMINAL OVERALL LENGTH1.625 INCHES IN
STYLE DESIGNATORSCREWED
OPERATING PRESSURE500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
SEAT TYPEGROUND-JOINT
NOMINAL THREAD SIZE0.250 INCHES ALL ENDS IN
SPECIAL FEATURESTHE OVERALL SURFACE TREATMENT COATING IS BLACK
MATERIALIRON OVERALL
SUBSTITUTES & CROSS-REFERENCES 5
1621-040Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
WW-U-351-22TBReference document
Same NSN cross-reference
Reference document — Identification reference
519 1-4BLKReference document
Same NSN cross-reference
Reference document — Secondary reference
519 1-4Reference document
Same NSN cross-reference
Reference document — Secondary reference
554-1/4BLKReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is B1639?
B1639 is a PRINTED WIRING BOARD.
What parts can replace B1639?
There are 5 known substitutes for B1639: 1621-040, WW-U-351-22TB, 519 1-4BLK and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for B1639?
B1639 is cataloged in the U.S. Government catalog under NSN 4730-00-092-9670. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.