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49959 ✓ Verified by PartsTable
Esselte · 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 SWITCH,PUSH is a Esselte industrial component. Key specifications include material: STEEL COMP 8740, thread_size: 7/16IN-20 IN, thread_class: 3A A, thread_length: 0.380 INCHES NOMINAL IN, overall_length: 0.600 INCHES NOMINAL IN, special_features: FOR USE ON AUTOCLAVE MODEL 3500 SERIES. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-448-6808, 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
49959
NSN: 4730-00-448-6808
FSC: 4730
CAGE: 00198 — PRATT & WHITNEY CANADA CORP DIV PRATT & WHITNEY CANADA CORP. (CAN)
SPECIFICATIONS
materialSTEEL COMP 8740
thread_size7/16IN-20 IN
thread_class3A A
thread_length0.380 INCHES NOMINAL IN
overall_length0.600 INCHES NOMINAL IN
special_featuresFOR USE ON AUTOCLAVE MODEL 3500 SERIES
style_designatorHEXAGON, EXTERNAL THREAD, BOSS
thread_directionRIGHT-HAND
surface_treatmentCADMIUM
width_across_flats0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN
screw_thread_locationEXTERNAL
casehardening_indicatorNOT CASEHARDENED
NSN4730-00-448-6808
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 49959 · Esselte ⚠ 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
•
THREAD LENGTH: 0.380 INCHES NOMINAL IN
•
THREAD CLASS: 3A A
•
SCREW THREAD LOCATION: EXTERNAL
•
WIDTH ACROSS FLATS: 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN
•
SMALLEST INSIDE DIAMETER: 0.264 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN
•
MATERIAL: STEEL COMP 8740
•
SURFACE TREATMENT: CADMIUM
TECHNICAL CHARACTERISTICS (FLIS)
THREAD LENGTH0.380 INCHES NOMINAL IN
THREAD CLASS3A A
SPECIAL FEATURESONE 0.062 IN.DIA HOLE DRILLED THRU CORNER OF HEX IN
SCREW THREAD LOCATIONEXTERNAL
WIDTH ACROSS FLATS0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN
SMALLEST INSIDE DIAMETER0.264 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN
MATERIALSTEEL COMP 8740
SURFACE TREATMENTCADMIUM
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONAMS 2400 ASSN STD SINGLE TREATMENT RESPONSE
STYLE DESIGNATORHEXAGON, EXTERNAL THREAD, BOSS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
49959AInterchangeable
interchangeable cross-reference
interchangeable
49959Interchangeable
interchangeable cross-reference
interchangeable
49881Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 49959?
49959 is a SWITCH,PUSH manufactured by Esselte.
What parts can replace 49959?
There are 3 known substitutes for 49959: 49959A, 49959, 49881. Substitute compatibility should be verified for your specific system.
What is the NSN for 49959?
49959 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-448-6808. 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