PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

53681ASThermometer,indicating,capillary

Hercules Engine Co Inc · NSN 6685-00-628-9303 · FSC 6685 · No Item Name Available
Verified by PartsTable
NSN 6685-00-628-9303 — this item is cataloged by the U.S. Government under National Stock Number 6685-00-628-9303. Primary manufacturer part number: 53681AS.
Features
  • Thermometer,indicating,capillary — FSC 6685
  • Scale Smallest Increment: 10.0 DEG FAHRENHEIT
  • Bulb Overall Length: 2.500 INCHES NOMINAL IN
  • Indicator Connection Method: FLEXIBLE TUBE
  • Material: STEEL METER CASE
  • Material: COPPER BULB
  • Scale Type: CONCENTRIC DIAL
  • Bulb Quantity: 1
Applications
  • Applications requiring Steel Meter Case construction
General Description

The Thermometer,indicating,capillary, cataloged under National Stock Number 6685-00-628-9303, is classified within Federal Supply Class 6685 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Hercules Engine Co Inc. Government technical data includes 18 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 10 commercial cross-references from 4 manufacturers, enabling identification through both NSN and commercial part number lookups. 9 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN6685-00-628-9303
Primary Part Number53681AS
Item NameThermometer,indicating,capillary
FSC / FSG6685 / 66 — No Item Name Available
ManufacturerHercules Engine Co Inc
StatusCANCELLED
Scale Smallest Increment10.0 DEG FAHRENHEIT
Bulb Overall Length2.500 INCHES NOMINAL IN
Indicator Connection MethodFLEXIBLE TUBE
MaterialSTEEL METER CASE
MaterialCOPPER BULB
Scale TypeCONCENTRIC DIAL
Bulb Quantity1
Dial Diameter2.000 INCHES NOMINAL IN
Flexible Tube Length48.000 INCHES NOMINAL IN
Scale Inscription/background ColorWHITE MARKING ON BLACK
Active Portion Length1.500 INCHES NOMINAL IN
Active Portion Diameter0.344 INCHES NOMINAL IN
Pointer/pen Type and Quantity1 INDICATING SINGLE
Bulb TypePLAIN RIGID
Bulb Connection TypeUNION
Actuating MediumVAPOR TENSION
Case TypeDUSTPROOF
Case Diameter2.234 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 9
3655-00-065-6625 INTERCHANGEABLE
Guide,crosshead
5340-00-119-615453681 INTERCHANGEABLE
Seat,helical Compression Spring
Hamilton Sundstrand Corporation Dba Collins Aerospace
6685-00-524-9210 INTERCHANGEABLE
Thermometer,indicating,capillary
5325-00-579-78255R2-1 INTERCHANGEABLE
Receptacle,turnlock Fastener
Howmet Global Fastening Systems Inc Div Camloc Products
5961-00-712-3938232-1133P4 INTERCHANGEABLE
Semiconductor Device,diode
Raytheon Company Div Corp
5940-00-836-2459 INTERCHANGEABLE
Terminal,lug
3655-01-206-492053681 INTERCHANGEABLE
Guide,crosshead
Hydro-Test Products, Inc. Dba Hydro-Test Products Inc
6150-01-505-378053681-1 INTERCHANGEABLE
Cable Assembly,special Purpose,e
Naval Air Warfare Ctr Aircraft Div
5315-01-549-0334 INTERCHANGEABLE
Pin,cotter
Cross-Reference Index
Part NumberManufacturer
53681AS Hercules Engine Co Inc (USA)
53681-00 Hercules Engine Co Inc (USA)
56AZ130 Chase Industries, Inc. Dba Chase Doors Div Chase Doors (USA)
53681AS Brinkley Technology Group Llc Dba Hercules Manufacturing (USA)
53681-00 Brinkley Technology Group Llc Dba Hercules Manufacturing (USA)
53681 Brinkley Technology Group Llc Dba Hercules Manufacturing (USA)
40-2501026 Brinkley Technology Group Llc Dba Hercules Manufacturing (USA)
10-35-00-66 Enovation Controls Llc (USA)
53681 Hercules Engine Co Inc (USA)
SR21 Enovation Controls Llc (USA)
Related Parts
3655-00-065-6625INTERCHANGEABLE
GUIDE,CROSSHEAD
5340-00-119-6154INTERCHANGEABLE
SEAT,HELICAL COMPRESSION SPRING
53681
6685-00-524-9210INTERCHANGEABLE
THERMOMETER,INDICATING,CAPILLARY
5325-00-579-7825INTERCHANGEABLE
RECEPTACLE,TURNLOCK FASTENER
5R2-1
5961-00-712-3938INTERCHANGEABLE
SEMICONDUCTOR DEVICE,DIODE
232-1133P4
5940-00-836-2459INTERCHANGEABLE
TERMINAL,LUG
3655-01-206-4920INTERCHANGEABLE
GUIDE,CROSSHEAD
53681
6150-01-505-3780INTERCHANGEABLE
CABLE ASSEMBLY,SPECIAL PURPOSE,E
53681-1
5315-01-549-0334INTERCHANGEABLE
PIN,COTTER

Frequently Asked Questions

What is NSN 6685-00-628-9303?

NSN 6685-00-628-9303 is a Thermometer,indicating,capillary, manufactured by Hercules Engine Co Inc, classified under FSC 6685 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 6685-00-628-9303?

NSN 6685-00-628-9303 has 10 cross-referenced part numbers: 53681AS (Hercules Engine Co Inc), 53681-00 (Hercules Engine Co Inc), 56AZ130 (Chase Industries, Inc. Dba Chase Doors Div Chase Doors), 53681AS (Brinkley Technology Group Llc Dba Hercules Manufacturing), 53681-00 (Brinkley Technology Group Llc Dba Hercules Manufacturing) and 5 more.

What NSN replaces 6685-00-628-9303?

There are 9 known substitutes for 6685-00-628-9303: 3655-00-065-6625, 5340-00-119-6154, 6685-00-524-9210 and 6 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 53681AS?

Key specifications for 53681AS: Scale Smallest Increment: 10.0 DEG FAHRENHEIT; Bulb Overall Length: 2.500 INCHES NOMINAL IN; Indicator Connection Method: FLEXIBLE TUBE; Material: STEEL METER CASE. 18 total characteristics are documented in the Federal Logistics Information System.

Is NSN 6685-00-628-9303 still in active supply?

NSN 6685-00-628-9303 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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