PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

1DFFMGage,pressure,dial Indicating

Desco Corp Marsh Bellofram Div · NSN 6685-00-557-0625 · FSC 6685 · No Item Name Available
Verified by PartsTable
NSN 6685-00-557-0625 — this item is cataloged by the U.S. Government under National Stock Number 6685-00-557-0625. Primary manufacturer part number: 1DFFM.
Features
  • Gage,pressure,dial Indicating — FSC 6685
  • Bolt Circle Diameter: 4.312 INCHES NOMINAL IN
  • Mounting Hole Diameter: 0.218 INCHES NOMINAL IN
  • Material: COPPER ALLOY ACTUATING ELEMENT
  • Connection Size: 7/16-20 UNF-3A THD SIZE A
  • Scale Accuracy: 2 PCT ENTIRE RANGE
  • Adjustability: ADJUSTABLE
  • Mounting Method: FLUSH PANEL
Applications
  • Applications requiring Copper Alloy Actuating Element construction
General Description

The Gage,pressure,dial Indicating, cataloged under National Stock Number 6685-00-557-0625, is classified within Federal Supply Class 6685 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Desco Corp Marsh Bellofram Div. Government technical data includes 26 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6685-00-557-0625
Primary Part Number1DFFM
Item NameGage,pressure,dial Indicating
FSC / FSG6685 / 66 — No Item Name Available
ManufacturerDesco Corp Marsh Bellofram Div
StatusACTIVE
Bolt Circle Diameter4.312 INCHES NOMINAL IN
Mounting Hole Diameter0.218 INCHES NOMINAL IN
MaterialCOPPER ALLOY ACTUATING ELEMENT
Connection Size7/16-20 UNF-3A THD SIZE A
Scale Accuracy2 PCT ENTIRE RANGE
AdjustabilityADJUSTABLE
Mounting MethodFLUSH PANEL
Scale NamePRESSURE
Pointer TypeINDICATING
Connection Quantity1
Bezel TypeSLIPS-ON
Scale Range+0.000 TO 100.000 POUNDS PRESSURE PER SQUARE INCH LBS
Dial Size3-1/2 IN. DIA IN
Connection LocationBACK, CENTER
Scale Smallest Increment2.000 POUNDS LBS
Connection TypeEXTERNAL
Connector Type VentNOT PROVIDED
Actuation TypeSINGLE BOURDON TUBE
Graduation Unit10.000 POUNDS LBS
Scale TypeSINGLE
Pointer ColorBLACK
Scale Inscription/background ColorBLACK FIGURES ON WHITE BACKGROUND
Overall Diameter4.750 INCHES NOMINAL IN
Mounting Hole Quantity3
MaterialGLASS PROTECTIVE CRYSTAL
MaterialSTEEL CASE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
6685-00-089-44802 1-2 1DFFM1-8 02T060 INTERCHANGEABLE
Gage,pressure,dial Indicating
Bellofram Corporation
5935-00-229-73771453 INTERCHANGEABLE
Connector,plug,electrical
Parker Hannifin Corporation Div Cylinder Division
6685-00-580-3488J6254 INTERCHANGEABLE
Gage,pressure,dial Indicating
Bellofram Corporation
6685-00-585-3078 INTERCHANGEABLE
Gage,pressure,dial Indicating
6685-00-618-6696 INTERCHANGEABLE
Gage,pressure,dial Indicating
6220-00-845-109190302 INTERCHANGEABLE
Lens,light
Grote Industries Inc Dba Grote Manufacturing Co Div Military Products
4320-00-907-095079889/02-218-001 INTERCHANGEABLE
Seal Assembly,shaft,spring Loade
Defense Maritime Solutions, Inc.
6685-00-936-604125-1001-H-02B-XFF-100 INTERCHANGEABLE
Gage,pressure,dial Indicating
Ashcroft Inc Dba Heise
5905-01-223-4019 INTERCHANGEABLE
Resistor,fixed,wire Wound,induct
5120-01-399-95214785 INTERCHANGEABLE
Handle,socket Wrench
The Stanley Works Dba Stanley Proto
Cross-Reference Index
Part NumberManufacturer
1DFFM Desco Corp Marsh Bellofram Div (USA)
1DFFM Bellofram Corporation (USA)
4785 Jaidinger Manufacturing Co Inc Dba Jaidinger Manufacturing Co Inc (USA)
Related Parts
6685-00-089-4480INTERCHANGEABLE
GAGE,PRESSURE,DIAL INDICATING
2 1-2 1DFFM1-8 02T060
5935-00-229-7377INTERCHANGEABLE
CONNECTOR,PLUG,ELECTRICAL
1453
6685-00-580-3488INTERCHANGEABLE
GAGE,PRESSURE,DIAL INDICATING
J6254
6685-00-585-3078INTERCHANGEABLE
GAGE,PRESSURE,DIAL INDICATING
6685-00-618-6696INTERCHANGEABLE
GAGE,PRESSURE,DIAL INDICATING
6220-00-845-1091INTERCHANGEABLE
LENS,LIGHT
90302
4320-00-907-0950INTERCHANGEABLE
SEAL ASSEMBLY,SHAFT,SPRING LOADE
79889/02-218-001
6685-00-936-6041INTERCHANGEABLE
GAGE,PRESSURE,DIAL INDICATING
25-1001-H-02B-XFF-100
5905-01-223-4019INTERCHANGEABLE
RESISTOR,FIXED,WIRE WOUND,INDUCT
5120-01-399-9521INTERCHANGEABLE
HANDLE,SOCKET WRENCH
4785
3010-01-498-9638INTERCHANGEABLE
CLUTCH DRUM HFE
4785
6515-01-574-3261INTERCHANGEABLE
BLADE,SURGICAL KNIFE,DETACHABLE
25608-994

Frequently Asked Questions

What is NSN 6685-00-557-0625?

NSN 6685-00-557-0625 is a Gage,pressure,dial Indicating, manufactured by Desco Corp Marsh Bellofram Div, classified under FSC 6685 (No Item Name Available). Status: active.

What are the part numbers for NSN 6685-00-557-0625?

NSN 6685-00-557-0625 has 3 cross-referenced part numbers: 1DFFM (Desco Corp Marsh Bellofram Div), 1DFFM (Bellofram Corporation), 4785 (Jaidinger Manufacturing Co Inc Dba Jaidinger Manufacturing Co Inc).

What NSN replaces 6685-00-557-0625?

There are 12 known substitutes for 6685-00-557-0625: 6685-00-089-4480, 5935-00-229-7377, 6685-00-580-3488 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 1DFFM?

Key specifications for 1DFFM: Bolt Circle Diameter: 4.312 INCHES NOMINAL IN; Mounting Hole Diameter: 0.218 INCHES NOMINAL IN; Material: COPPER ALLOY ACTUATING ELEMENT; Connection Size: 7/16-20 UNF-3A THD SIZE A. 28 total characteristics are documented in the Federal Logistics Information System.

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