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57DFFM — THERMOMETER,INDICATING,CAPILLARY

✓ Government record, cited
BELLOFRAM CORPORATION · COMPONENT
PRODUCT OVERVIEW

57DFFM: THERMOMETER,INDICATING,CAPILLARY.

THERMOMETER,INDICATING,CAPILLARY. Key specifications include MATERIAL: COPPER ALLOY BULB, BULB TYPE: FLEXIBLE CAPILLARY, CASE TYPE: VAPORPROOF, BULB STYLE: PLAIN BULB W/BENDABLE EXTENSION, SCALE TYPE: CONCENTRIC DIAL, CASE DIAMETER: 3.468 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 6685-00-350-7661, 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
57DFFM
NSN: 6685-00-350-7661
NIINs: 003507661, 008145682, 008549168, 008699342
FSC: 6685 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments
CAGE: 38508 — DESCO CORP MARSH BELLOFRAM DIV (USA)
SPECIFICATIONS
MATERIALCOPPER ALLOY BULB
BULB TYPEFLEXIBLE CAPILLARY
CASE TYPEVAPORPROOF
BULB STYLEPLAIN BULB W/BENDABLE EXTENSION
SCALE TYPECONCENTRIC DIAL
BULB QUANTITY1
CASE DIAMETER3.468 INCHES NOMINAL IN
DIAL DIAMETER2.500 INCHES NOMINAL IN
BULB TIP LENGTH2.750 INCHES NOMINAL IN
STYLE DESIGNATORBULB W/O SOCKET
BULB OVERALL LENGTH3.250 INCHES NOMINAL IN
BULB CONNECTION TYPEUNION
NSN6685-00-350-7661
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR MFR: BELLOFRAM CORPORATION THERMOMETER,INDICATING,CAPILLARY TITLE COMPONENT PN 57DFFM MFR BELLOFRAM CORPORATION THERMOMETER,INDICATING
KEY FEATURES
•
FLEXIBLE TUBE LENGTH: 72.000 INCHES NOMINAL IN
•
BULB TYPE: PLAIN RIGID
•
ACTIVE PORTION DIAMETER: 0.380 INCHES NOMINAL IN
•
BULB CONNECTION TYPE: UNION
•
DIAL DIAMETER: 2.500 INCHES NOMINAL IN
•
INDICATOR CONNECTION METHOD: FLEXIBLE TUBE
•
STYLE DESIGNATOR: BULB W/O SOCKET
•
CASE DIAMETER: 2.481 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
FLEXIBLE TUBE LENGTH72.000 INCHES NOMINAL IN
BULB TYPEPLAIN RIGID
ACTIVE PORTION DIAMETER0.380 INCHES NOMINAL IN
BULB CONNECTION TYPEUNION
DIAL DIAMETER2.500 INCHES NOMINAL IN
INDICATOR CONNECTION METHODFLEXIBLE TUBE
STYLE DESIGNATORBULB W/O SOCKET
CASE DIAMETER2.481 INCHES NOMINAL IN
ACTUATING MEDIUMVAPOR TENSION
POINTER/PEN TYPE AND QUANTITY1 INDICATING SINGLE
SUBSTITUTES & CROSS-REFERENCES 2
19526-204-1Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
K3020NNReference document
Same NSN cross-reference
Reference document — Design control — primary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — no further procurement; issued until stock is exhaustedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 57DFFM?
57DFFM is a THERMOMETER,INDICATING,CAPILLARY manufactured by BELLOFRAM CORPORATION.
What parts can replace 57DFFM?
There are 2 known substitutes for 57DFFM: 19526-204-1, K3020NN. Substitute compatibility should be verified for your specific system.
What is the NSN for 57DFFM?
57DFFM is cataloged in the U.S. Government catalog under NSN 6685-00-350-7661. 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.