C305R-18 Full Flexible Steel Rule with Inch Graduations 51349

C303R, C306R, C309R, C310R Steel Rules with Inch Graduations
Full Flexible Steel Rule with Inch Graduations, 5R Style Graduations, 18" Length, 3/4" Width, 1/50" Thickness

The Starrett 18" Full-Flexible Steel Rule with Inch Graduation features a satin chrome finish. Graduations at quick-reading 32nds, 64ths, aircraft quick-reading 50ths, 100ths. 18", 5R Grad, Full-Flexible.

3D CAD Files / Exploded Parts Diagram
Product Testimonials

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  • Full-Flexible
  • Satin chrome finish
  • Quick Reading
  • Rules with single row of inch figures (all rules under 1" width)


  • Made in America: Yes
  • Length (in): 18"
  • Graduation Type: 5R
  • Graduations: Quick-Reading 10ths, Aircraft Quick-Reading 100ths, 32nds and 64ths
  • Finish: Satin Chrome
  • Style: Single Row of Inch Figures
  • Construction: Full-Flexible Steel
  • Thickness (in): 1/50"
  • Width (in): 3/4"


    2D Dimensional Drawing (PDF)



    92.94 kb

3D CAD Files / Exploded Parts Diagram

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Product Testimonials

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    • Scott B. (1/18/2019)
      I love this ruler. My mother gave me one of these when I was in elementary school over 40 years ago. I used to use it for art projects and measure things all over the house back then. I used it throughout Jr. High and High School for my advanced art and drafting classes and various school projects. I didn't bring it with me to college, but I would use it for projects I would build when I'd go back home for the summer. I've continued to use it around the house throughout my life for various projects and measurements around the house. I've always loved the reliable straight edge, flexibility and the ability to make precision measurement in 10ths or 100ths of an inch. About a month ago, I looked into the drawer where I normally keep it and was saddened to find it missing. I was happy to discover this evening that my 13-year old daughter had been using it for projects of her own. I'm very glad to see Starrett is still in business and they're continuing to make the world's best ruler.