PartsTable
Technical Data Sheet
PartsTable / MRO / B37
B37 ✓ 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

THERMAL RELEASE,CIRCUIT BREAKER. Key specifications include material: STEEL CORROSION RESISTING, shank_type: ROUND, point_shape: ROUND, construction: ONE-PIECE, body_material: STEEL, overall_depth: 0.500 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-203-0215, 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→ B37
NSN: 4730-00-203-0215
FSC: 4730
CAGE: 97111 — PARKER-HANNIFIN CORPORATION DIV QUICK COUPLING DIVISION (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING
shank_typeROUND
point_shapeROUND
constructionONE-PIECE
body_materialSTEEL
overall_depth0.500 INCHES NOMINAL IN
overall_width1.000 INCHES NOMINAL IN
overall_length1.875 INCHES NOMINAL IN
size_designator14
outside_diameter0.498 INCHES NOMINAL IN
style_designatorCIRCULAR
aperture_diameter0.378 INCHES NOMINAL IN
NSN4730-00-203-0215
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: B37 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 30
AA59439-11-12-00BInterchangeable
interchangeable cross-reference
interchangeable
M4109-11-12-00BInterchangeable
interchangeable cross-reference
interchangeable
AA59439-011-12-00-BInterchangeable
interchangeable cross-reference
interchangeable
51-10311Interchangeable
interchangeable cross-reference
interchangeable
55519Interchangeable
interchangeable cross-reference
interchangeable
716-020466Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B37?
B37 is a THERMAL RELEASE,CIRCUIT BREAKER. It is classified as a MRO (MRO_GENERAL).
What parts can replace B37?
There are 30 known substitutes for B37: AA59439-11-12-00B, M4109-11-12-00B, AA59439-011-12-00-B and 27 more. Substitute compatibility should be verified for your specific system.
What is the NSN for B37?
B37 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-203-0215. 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