PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

C303R-6Rule,machinist's

L.s. Starrett Company (the) Div Tool Division · NSN 5210-01-520-8420 · FSC 5210 · No Item Name Available
Verified by PartsTable
NSN 5210-01-520-8420 — this item is cataloged by the U.S. Government under National Stock Number 5210-01-520-8420. Primary manufacturer part number: C303R-6.
Features
  • Rule,machinist's — FSC 5210
  • Thickness: 0.016 INCHES NOMINAL IN
  • Edge Smallest Graduation Unit: 1/64 INCH AND 1/50 INCH AND 1/32 INCH AND 1/10 INCH IN
  • Length: 6.000 INCHES IN
  • Material: STEEL
  • Width: 0.500 INCHES NOMINAL IN
  • 2 verified cross-references
  • Primary manufacturer: L.s. Starrett Company (the) Div Tool Division
Applications
  • Applications requiring Steel construction
General Description

The Rule,machinist's, cataloged under National Stock Number 5210-01-520-8420, is classified within Federal Supply Class 5210 (No Item Name Available) of the Measuring Tools group. The primary manufacturer of record is L.s. Starrett Company (the) Div Tool Division. Government technical data includes 5 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5210-01-520-8420
Primary Part NumberC303R-6
Item NameRule,machinist's
FSC / FSG5210 / 52 — No Item Name Available
ManufacturerL.s. Starrett Company (the) Div Tool Division
StatusACTIVE
Thickness0.016 INCHES NOMINAL IN
Edge Smallest Graduation Unit1/64 INCH AND 1/50 INCH AND 1/32 INCH AND 1/10 INCH IN
Length6.000 INCHES IN
MaterialSTEEL
Width0.500 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 6
5360-00-093-947951334 INTERCHANGEABLE
Spring,helical,extension
Honeywell International Inc. Dba Honeywell Div Aerospace-South Bend (westmoor St)
3110-00-293-917351334 INTERCHANGEABLE
Bearing,ball,annular
Suntec Industries Inc Del Dba Suntec
6685-00-424-72416270C INTERCHANGEABLE
Thermometer Testing Set
Miller and Weber Inc
5935-00-527-8657 INTERCHANGEABLE
Contact
4820-00-949-751937 3-4 INTERCHANGEABLE
Valve,check
Crane Co Div Valve Div
2940-01-356-4624042424 INTERCHANGEABLE
Filter Element,fluid
Excel Industries, Inc Dba Excel Industries of Kansas Div Government Sales
Cross-Reference Index
Part NumberManufacturer
51334 L.s. Starrett Company (the) Div Tool Division (USA)
C303R-6 PRIMARY L.s. Starrett Company (the) Div Tool Division (USA)
Related Parts
5360-00-093-9479INTERCHANGEABLE
SPRING,HELICAL,EXTENSION
51334
3110-00-293-9173INTERCHANGEABLE
BEARING,BALL,ANNULAR
51334
6685-00-424-7241INTERCHANGEABLE
THERMOMETER TESTING SET
6270C
5935-00-527-8657INTERCHANGEABLE
CONTACT
4820-00-949-7519INTERCHANGEABLE
VALVE,CHECK
37 3-4
2940-01-356-4624INTERCHANGEABLE
FILTER ELEMENT,FLUID
042424

Frequently Asked Questions

What is NSN 5210-01-520-8420?

NSN 5210-01-520-8420 is a Rule,machinist's, manufactured by L.s. Starrett Company (the) Div Tool Division, classified under FSC 5210 (No Item Name Available). Status: active.

What are the part numbers for NSN 5210-01-520-8420?

NSN 5210-01-520-8420 has 2 cross-referenced part numbers: 51334 (L.s. Starrett Company (the) Div Tool Division), C303R-6 (L.s. Starrett Company (the) Div Tool Division).

What NSN replaces 5210-01-520-8420?

There are 6 known substitutes for 5210-01-520-8420: 5360-00-093-9479, 3110-00-293-9173, 6685-00-424-7241 and 3 more. Verify interchangeability with system specifications before substitution.

What are the specifications of C303R-6?

Key specifications for C303R-6: Thickness: 0.016 INCHES NOMINAL IN; Edge Smallest Graduation Unit: 1/64 INCH AND 1/50 INCH AND 1/32 INCH AND 1/10 INCH IN; Length: 6.000 INCHES IN; Special Features: FLEXIBLE; SATIN CHROME FINISH. 6 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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