PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

500921Timer,sequential

Dynarad · NSN 6645-01-440-7670 · FSC 6645 · No Item Name Available
Verified by PartsTable
NSN 6645-01-440-7670 — this item is cataloged by the U.S. Government under National Stock Number 6645-01-440-7670. Primary manufacturer part number: 500921.
Features
  • Timer,sequential — FSC 6645
  • 1 verified cross-reference
  • Primary manufacturer: Dynarad
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Timer,sequential, cataloged under National Stock Number 6645-01-440-7670, is classified within Federal Supply Class 6645 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Dynarad. This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 3 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6645-01-440-7670
Primary Part Number500921
Item NameTimer,sequential
FSC / FSG6645 / 66 — No Item Name Available
ManufacturerDynarad
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 3
5331-01-012-5148671-00249-0 INTERCHANGEABLE
O-Ring
Parker-Hannifin Corporation Dba Pneutronics Div Hydraulic Pump Division
5961-01-032-7930L02320 INTERCHANGEABLE
Semiconductor Devices,unitized
Dla Land and Maritime Dba Engineering and Technical Support Div Document Standardization Division (vendor Item Drawings)
6630-01-225-9834500921 INTERCHANGEABLE
Board,amplifier
Servomex Company
Cross-Reference Index
Part NumberManufacturer
500921 PRIMARY Dynarad (USA)
Related Parts
5331-01-012-5148INTERCHANGEABLE
O-RING
671-00249-0
5961-01-032-7930INTERCHANGEABLE
SEMICONDUCTOR DEVICES,UNITIZED
L02320
6630-01-225-9834INTERCHANGEABLE
BOARD,AMPLIFIER
500921

Frequently Asked Questions

What is NSN 6645-01-440-7670?

NSN 6645-01-440-7670 is a Timer,sequential, manufactured by Dynarad, classified under FSC 6645 (No Item Name Available). Status: active.

What are the part numbers for NSN 6645-01-440-7670?

NSN 6645-01-440-7670 has 1 cross-referenced part number: 500921 (Dynarad).

What NSN replaces 6645-01-440-7670?

There are 3 known substitutes for 6645-01-440-7670: 5331-01-012-5148, 5961-01-032-7930, 6630-01-225-9834. Verify interchangeability with system specifications before substitution.

What are the specifications of 500921?

Key specifications for 500921: Special Features: PCB ASSY,WITH ROTARY SWITCH; END ITEM APPLICATION 6525-01-370-7552; X-RAY APPARATUS,DENTAL; MODEL ALPHA MPDX; Part Name Assigned by Controlling Agency: TIMER SEQUENTIAL PCB ASSY W/ROTARY SWITCH E.I. 6525-01-370-7552. 2 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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