PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

A-A-2598Clock,alarm

Federal Commercial Item Description Promulgated by General Services Administration Washington DC · NSN 6645-00-268-4042 · FSC 6645 · No Item Name Available
Verified by PartsTable
NSN 6645-00-268-4042 — this item is cataloged by the U.S. Government under National Stock Number 6645-00-268-4042. Primary manufacturer part number: A-A-2598.
Features
  • Clock,alarm — FSC 6645
  • Nondefinitive Spec/std Data: 2 SIZE
  • Material: PLASTIC CASE
  • Dial Size: 4.0 IN. DIA IN
  • 5 verified cross-references
  • Primary manufacturer: Federal Commercial Item Description Promulgated by General Services Administration Washington DC
Applications
  • Applications requiring Plastic Case construction
General Description

The Clock,alarm, cataloged under National Stock Number 6645-00-268-4042, is classified within Federal Supply Class 6645 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Federal Commercial Item Description Promulgated by General Services Administration Washington DC. Government technical data includes 3 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 5 commercial cross-references from 5 manufacturers, enabling identification through both NSN and commercial part number lookups. 8 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6645-00-268-4042
Primary Part NumberA-A-2598
Item NameClock,alarm
FSC / FSG6645 / 66 — No Item Name Available
ManufacturerFederal Commercial Item Description Promulgated by General Services Administration Washington DC
StatusACTIVE
Nondefinitive Spec/std Data2 SIZE
MaterialPLASTIC CASE
Dial Size4.0 IN. DIA IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 8
6105-00-052-35301134617-2 INTERCHANGEABLE
Motor,control
Belfort Instrument Company
4730-00-166-9282SM18 INTERCHANGEABLE
Strainer,suction
B & B Tritech Inc.
3455-00-231-352809600 INTERCHANGEABLE
Cutter,milling,shell End
Niagara Cutter Inc
5930-00-249-4566HD22X2014 INTERCHANGEABLE
Switch,thermostatic
Therm-O-Disc Incorporated
6645-00-530-1096 INTERCHANGEABLE
Clock,alarm
4910-01-532-4200SM18 INTERCHANGEABLE
Lift,motor Vehicle
Vehicle Service Group, Llc Div Rotary Lift
5120-01-661-8445SM18 INTERCHANGEABLE
Socket,socket Wrench
Idsc Holdings Llc Div Snap-on Industrial, a Div. of Idsc Holdings , Llc
6660-01-716-0924SM-18 INTERCHANGEABLE
Wind Measuring Set
Campbell Scientific Inc
Cross-Reference Index
Part NumberManufacturer
A-A-2598 Federal Commercial Item Description Promulgated by General Services Administration Washington DC (USA)
GG-C-447 Federal Specifications Promulgated by General Services Administration Washington DC (USA)
CL034001 Marathon Watch Company Ltd (CAN)
GG-C-447 SZ2 General Services Administration Federal Supply Service (USA)
SM18 Hamilton Watch Co Inc (USA)
Related Parts
6105-00-052-3530INTERCHANGEABLE
MOTOR,CONTROL
1134617-2
4730-00-166-9282INTERCHANGEABLE
STRAINER,SUCTION
SM18
3455-00-231-3528INTERCHANGEABLE
CUTTER,MILLING,SHELL END
09600
5930-00-249-4566INTERCHANGEABLE
SWITCH,THERMOSTATIC
HD22X2014
6645-00-530-1096INTERCHANGEABLE
CLOCK,ALARM
4910-01-532-4200INTERCHANGEABLE
LIFT,MOTOR VEHICLE
SM18
5120-01-661-8445INTERCHANGEABLE
SOCKET,SOCKET WRENCH
SM18
6660-01-716-0924INTERCHANGEABLE
WIND MEASURING SET
SM-18

Frequently Asked Questions

What is NSN 6645-00-268-4042?

NSN 6645-00-268-4042 is a Clock,alarm, manufactured by Federal Commercial Item Description Promulgated by General Services Administration Washington DC, classified under FSC 6645 (No Item Name Available). Status: active.

What are the part numbers for NSN 6645-00-268-4042?

NSN 6645-00-268-4042 has 5 cross-referenced part numbers: A-A-2598 (Federal Commercial Item Description Promulgated by General Services Administration Washington DC), GG-C-447 (Federal Specifications Promulgated by General Services Administration Washington DC), CL034001 (Marathon Watch Company Ltd), GG-C-447 SZ2 (General Services Administration Federal Supply Service), SM18 (Hamilton Watch Co Inc).

What NSN replaces 6645-00-268-4042?

There are 8 known substitutes for 6645-00-268-4042: 6105-00-052-3530, 4730-00-166-9282, 3455-00-231-3528 and 5 more. Verify interchangeability with system specifications before substitution.

What are the specifications of A-A-2598?

Key specifications for A-A-2598: Nondefinitive Spec/std Data: 2 SIZE; Special Features: 32 HOURS MIN RUNNING TIME; 12 HOUR DIAL; LUMINOUS MINUTE, HOUR HAND AND DIAL MARKINGS; SECOND HAND IS RED; MECHANICAL KEYWOUND; LARGE ARABIC HOUR MARKINGS, BLACK ON WHITE BACKGROUND; Material: PLASTIC CASE; Dial Size: 4.0 IN. DIA IN. 4 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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