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Technical Data Sheet
PartsTable / MRO / B637
B637 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
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 TRANSFORMER,AUDIO FREQUENCY is a the manufacturer industrial component. Key specifications include angle: 45.0 DEGREES, color: YELLOW OVERALL, width: 1.500 INCHES NOMINAL IN, height: 0.812 INCHES NOMINAL IN, length: 1176.000 INCHES MINIMUM AND 1224.000 INCHES MAXIMUM IN, material: PLASTIC POLYVINYL FLUORIDE. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-050-4205, 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
MRO→ MRO_GENERAL→ B637
NSN: 4730-00-050-4205
FSC: 4730
CAGE: 05463 — WHEELABRATOR-FRYE INC BALCRANK PRODUCTS (USA)
SPECIFICATIONS
angle45.0 DEGREES
colorYELLOW OVERALL
width1.500 INCHES NOMINAL IN
height0.812 INCHES NOMINAL IN
length1176.000 INCHES MINIMUM AND 1224.000 INCHES MAXIMUM IN
materialPLASTIC POLYVINYL FLUORIDE
roll_width12.000 INCHES NOMINAL IN
roll_length98.0 FEET MINIMUM AND 102.0 FEET MAXIMUM FT
shank_length0.187 INCHES NOMINAL IN
nominal_width1.000 INCHES IN
inclosure_typeFULLY INCLOSED
nominal_length20.000 INCHES IN
NSN4730-00-050-4205
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: B637 · 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
•
STYLE DESIGNATOR: ANGLE
•
HEIGHT: 0.812 INCHES NOMINAL IN
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
•
ASSEMBLY CLEARANCE RADIUS: 0.406 INCHES MAXIMUM IN
•
ANGLE: 45.0 DEGREES
•
SCREW THREAD SERIES DESIGNATOR: SAE-LT
TECHNICAL CHARACTERISTICS (FLIS)
STYLE DESIGNATORANGLE
SPECIAL FEATURESGRUMMAN A10 AIRCRAFT
HEIGHT0.812 INCHES NOMINAL IN
NOMINAL THREAD SIZE0.250 INCHES IN
ASSEMBLY CLEARANCE RADIUS0.406 INCHES MAXIMUM IN
END ITEM IDENTIFICATIONMRAP BUFFALO MK2A2
ANGLE45.0 DEGREES
SCREW THREAD SERIES DESIGNATORSAE-LT
THREAD QUANTITY PER INCH28
WIDTH ACROSS FLATS0.375 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 32
S6127-61801-3Interchangeable
interchangeable cross-reference
interchangeable
21670Interchangeable
interchangeable cross-reference
interchangeable
21937Interchangeable
interchangeable cross-reference
interchangeable
122-660345 PC 30Interchangeable
interchangeable cross-reference
interchangeable
200954Interchangeable
interchangeable cross-reference
interchangeable
122-5277738 ITEM 33Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B637?
B637 is a TRANSFORMER,AUDIO FREQUENCY. It is classified as a MRO (MRO_GENERAL).
What parts can replace B637?
There are 32 known substitutes for B637: S6127-61801-3, 21670, 21937 and 29 more. Substitute compatibility should be verified for your specific system.
Is B637 still available?
B637 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