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steel rules
Precision rules, straight edges, Parallels
steel rules WItH IncH GrAduAtIons Key to Starrett Rule Numbering System
Prefixes
1-144" C Satin Chrome Finish
All rules furnished with Starrett satin chrome finish, except where noted. Additional sizes and variations DH Double Hook
available by special order. H Suffixes Single Hook
rules Include E End Graduations
K With Pocket Clip
• Full-Flexible N Narrow-Type Rule
• Semi-Flexible R Quick-Reading
S Semi-Flexible
• Spring-Tempered
T Tapered End
• Heavy Spring-Tempered

1-4" Spring-Tempered Steel Rules with Inch Graduations
Width x
Cat. No. EDP Length Thickness Graduations Feature Remarks
C604R-1* 56464 1" 1/2 x 3/64" 4R – 8ths, 16ths, Quick-Reading 32nds, 64ths
C604R-2* 56465 2"
C604R-3* 56466 3" 9/16 x 3/64" 4R – 8ths, 16ths, Quick-Reading 32nds, 64ths
C604R-4* 56467 4" 5/8 x 3/64" 4R – 8ths, 16ths, Quick-Reading 32nds, 64ths
6" Full-Flexible Steel Rules with Inch Graduations
Cat. No. EDP Length Width x Thickness Graduations Feature Remarks
C303R-6* 51334 6" 1/2 x 1/64" 3R – Quick-Reading 10ths, Aircraft Quick-Reading 50ths, 32nds and 64ths
C304R-6* 66008 6" 1/2 x 1/64" 4R – 8ths, 16ths, Quick-Reading 32nds and 64ths
C305R-6* 51347 6" 1/2 x 1/64" 5R – Quick-Reading 10ths, Aircraft Quick-Reading 100ths, 32nds and 64ths
C305R-6 W/SLC* 66880 With Standard Letter of Certification †
6R – One Side Only – Quick-Reading 10ths (.10) Top Edge; Aircraft Quick-Reading
C306R-6* 51352 6" 1/2 x 1/64"
50ths (.02) Bottom Edge
C309R-6* 51357 6" 1/2 x 1/64" 9R – 16ths and Quick-Reading 32nds on One Side; Quick-Reading 64ths on Reverse Side
C310R-6* 51368 6" 1/2 x 1/64" 10R – Quick-Reading 32nds, 64ths on One Side Only
C310K-6* 56701 6" 1/2 x 1/64" 10 – 32nds and 64ths on One Side Only With Pocket Clip
C310T-6* 56700 6" 1/2 x 1/64" 10 – 32nds One Side; 64ths on Reverse Side With Tapered End
C316R-6* 51374 6" 1/2 x 1/64" 16R – Quick-Reading 32nds, 64ths, Aircraft Quick-Reading 50ths and 100ths
1309R-6* 53204 6" 1/2 x 1/64" 9R – 16ths and Quick-Reading 32nds on One Side; Quick-Reading 64ths on Reverse Side Stainless Steel
6" Semi-Flexible Steel Rules with Inch Graduations
Cat. No. EDP Length Width x Thickness Graduations Feature Remarks
C303SR-6* 51335 6" 3/4 x 1/50" 3R – Quick-Reading 10ths, Aircraft Quick-Reading 50ths, 32nds and 64ths
4R – 8ths, 16ths, Quick-Reading 32nds and 64ths; End Graduations in 32nds Both
C304SRE-6* 51343 6" 3/4 x 1/50" End Graduations
Ends, One Side
† Includes redemption card for Standard Letter of Certification (SLC).
*Indicates rules with single row of inch figures (all rules under 1" width). Rules without asterisk have double row of inch figures, and each edge represents the bottom edge reading left to right (rules 1" and wider).

H604R-6 with Reversible Hook

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