PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

M25-37-6Pen,blue Fiber Tip

Ashcroft Inc Dba Heise · NSN 6685-01-305-5607 · FSC 6685 · No Item Name Available
Verified by PartsTable
NSN 6685-01-305-5607 — this item is cataloged by the U.S. Government under National Stock Number 6685-01-305-5607. Primary manufacturer part number: M25-37-6.
Features
  • Pen,blue Fiber Tip — FSC 6685
  • 2 verified cross-references
  • Primary manufacturer: Ashcroft Inc Dba Heise
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Pen,blue Fiber Tip, cataloged under National Stock Number 6685-01-305-5607, is classified within Federal Supply Class 6685 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Ashcroft Inc Dba Heise. This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NamePen,blue Fiber Tip
FSC / FSG6685 — No Item Name Available (FSG 66)
ManufacturersWeksler Glass Thermometer Corp (CAGE 64467); Ashcroft Inc Dba Heise (CAGE 049X3)
Technical Specifications
ParameterValue
NSN6685-01-305-5607
Primary Part NumberM25-37-6
Item NamePen,blue Fiber Tip
FSC / FSG6685 / 66 — No Item Name Available
ManufacturerAshcroft Inc Dba Heise
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 2
3020-00-196-1764 INTERCHANGEABLE
Link,roller Chain
3120-01-190-9669M2537 INTERCHANGEABLE
Bearing,sleeve
Morgan Advanced Materials and Technology, Inc. Dba Morgan Advanced Materials and Technology
Cross-Reference Index
Part NumberManufacturer
M25-37 Weksler Glass Thermometer Corp (USA)
M25-37-6 PRIMARY Ashcroft Inc Dba Heise (USA)
Related Parts
3020-00-196-1764INTERCHANGEABLE
LINK,ROLLER CHAIN
3120-01-190-9669INTERCHANGEABLE
BEARING,SLEEVE
M2537

Frequently Asked Questions

What is NSN 6685-01-305-5607?

NSN 6685-01-305-5607 is a Pen,blue Fiber Tip, manufactured by Ashcroft Inc Dba Heise, classified under FSC 6685 (No Item Name Available). Status: active.

What are the part numbers for NSN 6685-01-305-5607?

NSN 6685-01-305-5607 has 2 cross-referenced part numbers: M25-37 (Weksler Glass Thermometer Corp), M25-37-6 (Ashcroft Inc Dba Heise).

What NSN replaces 6685-01-305-5607?

There are 2 known substitutes for 6685-01-305-5607: 3020-00-196-1764, 3120-01-190-9669. Verify interchangeability with system specifications before substitution.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com