PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

4840Tachometer,mechanical,handheld

Schulze Mfg., Inc. · NSN 6680-00-531-6021 · FSC 6680 · No Item Name Available
Verified by PartsTable
NSN 6680-00-531-6021 — this item is cataloged by the U.S. Government under National Stock Number 6680-00-531-6021. Primary manufacturer part number: 4840.
Features
  • Tachometer,mechanical,handheld — FSC 6680
  • Pointer Quantity: 1
  • Accessory Components and Quantity: 1 STEEL TRIANGULAR TIP,1 RUBBER CONCAVE TIP,1 RUBBER LARGE CONVEX TIP,1 RUBBER SMALL CONVEX TIP,1 4.000 IN. EXTENSION ROD,AND 1 12.000 IN. PERIPHERAL DISC IN
  • Scale Measurement Range: +300.0 TO 1100.0 AND +1000.0 TO 1500.0 AND +3000.0 TO 11000.0
  • Operating Range: +300.0 TO 15000.0 REVOLUTIONS PER MINUTE
  • Scale Smallest Increment: 10.0 REVOLUTIONS PER MINUTE AND 100.0 REVOLUTIONS PER MINUTE
  • Speed Selector Measurement Range: +300.0 TO 1500.0 REVOLUTIONS PER MINUTE AND +1000.0 TO 5000.0 REVOLUTIONS PER MINUTE AND +3000.0 TO 15000.0 REVOLUTIONS PER MINUTE
  • Scale Measurement Unit: REVOLUTIONS PER MINUTE
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Tachometer,mechanical,handheld, cataloged under National Stock Number 6680-00-531-6021, is classified within Federal Supply Class 6680 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Schulze Mfg., Inc.. Government technical data includes 13 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 8 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN6680-00-531-6021
Primary Part Number4840
Item NameTachometer,mechanical,handheld
FSC / FSG6680 / 66 — No Item Name Available
ManufacturerSchulze Mfg., Inc.
StatusCANCELLED
Pointer Quantity1
Accessory Components and Quantity1 STEEL TRIANGULAR TIP,1 RUBBER CONCAVE TIP,1 RUBBER LARGE CONVEX TIP,1 RUBBER SMALL CONVEX TIP,1 4.000 IN. EXTENSION ROD,AND 1 12.000 IN. PERIPHERAL DISC IN
Scale Measurement Range+300.0 TO 1100.0 AND +1000.0 TO 1500.0 AND +3000.0 TO 11000.0
Operating Range+300.0 TO 15000.0 REVOLUTIONS PER MINUTE
Scale Smallest Increment10.0 REVOLUTIONS PER MINUTE AND 100.0 REVOLUTIONS PER MINUTE
Speed Selector Measurement Range+300.0 TO 1500.0 REVOLUTIONS PER MINUTE AND +1000.0 TO 5000.0 REVOLUTIONS PER MINUTE AND +3000.0 TO 15000.0 REVOLUTIONS PER MINUTE
Scale Measurement UnitREVOLUTIONS PER MINUTE
Speed SelectorPROVIDED
Manual ResetNOT PROVIDED
Measurement UnitREVOLUTIONS PER MINUTE
Unit TypeCENTRIFUGAL
Scale Quantity3
Carrying CasePROVIDED
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 8
6625-00-232-3832 INTERCHANGEABLE
Ammeter
5360-00-268-10554840 INTERCHANGEABLE
Spring,helical,compression
Curtiss-Wright Electro-Mechanical Corporation Dba Curtiss-Wright Steam and Air Solutions Div Steam and Air Solutions
5910-00-328-1752R5242 INTERCHANGEABLE
Capacitor,variable,air Dielectri
Barker's Food Machinery Service Inc.
5950-00-575-0841213-11 INTERCHANGEABLE
Coil,radio Frequency
Wilco Corp
4330-01-173-8227 INTERCHANGEABLE
Filter Element,fluid
5950-01-251-4756 INTERCHANGEABLE
Coil,electrical
1377-01-525-41194840 INTERCHANGEABLE
Cartridge,powder Actuated Tool
Hilti Inc
6640-01-572-86674840 INTERCHANGEABLE
Tip,pipet
Corning Incorporated Dba Corning Incorporated
Cross-Reference Index
Part NumberManufacturer
B Jones Instrument Corp (USA)
4840 PRIMARY Schulze Mfg., Inc. (USA)
BTYPE Jones Instrument Corp (USA)
4840 Jones Instrument Corp (USA)
Related Parts
6625-00-232-3832INTERCHANGEABLE
AMMETER
5360-00-268-1055INTERCHANGEABLE
SPRING,HELICAL,COMPRESSION
4840
5910-00-328-1752INTERCHANGEABLE
CAPACITOR,VARIABLE,AIR DIELECTRI
R5242
5950-00-575-0841INTERCHANGEABLE
COIL,RADIO FREQUENCY
213-11
4330-01-173-8227INTERCHANGEABLE
FILTER ELEMENT,FLUID
5950-01-251-4756INTERCHANGEABLE
COIL,ELECTRICAL
1377-01-525-4119INTERCHANGEABLE
CARTRIDGE,POWDER ACTUATED TOOL
4840
6640-01-572-8667INTERCHANGEABLE
TIP,PIPET
4840

Frequently Asked Questions

What is NSN 6680-00-531-6021?

NSN 6680-00-531-6021 is a Tachometer,mechanical,handheld, manufactured by Schulze Mfg., Inc., classified under FSC 6680 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 6680-00-531-6021?

NSN 6680-00-531-6021 has 4 cross-referenced part numbers: B (Jones Instrument Corp), 4840 (Schulze Mfg., Inc.), BTYPE (Jones Instrument Corp), 4840 (Jones Instrument Corp).

What NSN replaces 6680-00-531-6021?

There are 8 known substitutes for 6680-00-531-6021: 6625-00-232-3832, 5360-00-268-1055, 5910-00-328-1752 and 5 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 4840?

Key specifications for 4840: Pointer Quantity: 1; Accessory Components and Quantity: 1 STEEL TRIANGULAR TIP,1 RUBBER CONCAVE TIP,1 RUBBER LARGE CONVEX TIP,1 RUBBER SMALL CONVEX TIP,1 4.000 IN. EXTENSION ROD,AND 1 12.000 IN. PERIPHERAL DISC IN; Scale Measurement Range: +300.0 TO 1100.0 AND +1000.0 TO 1500.0 AND +3000.0 TO 11000.0; Operating Range: +300.0 TO 15000.0 REVOLUTIONS PER MINUTE. 13 total characteristics are documented in the Federal Logistics Information System.

Is NSN 6680-00-531-6021 still in active supply?

NSN 6680-00-531-6021 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.
PartsTable Design LLC · partstable.com