Combination Square Set, 12" 4R Precision 

Combination Square Set, 12" 4R Precision
  • Fully hardened steel with satin chrome finish blade
  • 4R Graduation – 8ths, 16ths, 32nds, 64ths
  • Protractor scale graduated from 0-180° in both directions
  • Square/Miter head feature level vial and hardened scribe tool
  • High precision engineering standard
Part Number: 5868
Weight: 2.96 lb

Price: $68.99

In stock
This premium square features a 12 Inch blade, a cast iron center finding head, a cast iron 180 degree protractor head and a cast iron square/miter head with 45 degree and 90 degree precision ground faces.

The adjustable heads may be locked securely in any position along the precision ground satin chrome finished steel blade. The protractor head can be moved in both directions.

The blade features etched, machine divided graduations in 1/8 Inch and 1/16 Inch on one side and 1/32 Inch and 1/64 Inch on the other.

The square/miter head incorporates a spirit level and hardened scriber.

The square comes packaged in a padded plastic storage case.

Chris Chris' Tips
The combination square was invented by Leroy Starrett (yes, that Starrett) in 1877. It's one of those basic tools that should be in every machinist's (and woodworker's) tool box.

The name combination square is truly appropriate for this tool, as it includes 7 basic components and can be used in hundreds of ways. In one package you get 90° and 45° squares, a protractor, a centering head, a precision scale, two levels, and a scriber.

Here is some information on using a combination square from Starrett.

"Rule - graduations in 32nds Combination Square Set Graduations in 32nds
"Rule - graduations in 64ths Combination Square Set Graduations in 64ths
"Rule - graduations in 8ths and 16ths Combination Square Set Graduations in 8ths and 16ths