20-4-1/2 Starrett Master Precision Square 4* Blade 3-1/2* Beam
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20-4 1/2
Starrett Master Precision Square
The finest precision-checking squares – not
graduated . Squareness accuracy to .0001″
(0 .0025mm) every 6″ (150mm)
These hardened steel squares are used
when extreme accuracy is required . The
beams and blades are hardened, ground
and lapped to ensure parallelism and
straightness . The beam is grooved at the
inner corner for clearance of burr or dirt .
Made of high quality tool steel, with the
finest of craftsmanship throughout
| 20 Master Precision Squares | ||||
Squares Only | Size – Length of Blade* | Length of Beam | ||
Cat . No | Inch | mm | Inch | mm |
20-1 1/2 | 1-1/2″ | 40 | 1-1/2″ | 40 |
20-3 | 3″ | 75 | 2-3/8″ | 60 |
20-4 1/2 | 4-1/2″ | 115 | 3 -1/2″ | 90 |
20-6 | 6″ | 150 | 4-5/16″ | 110 |
20-12 | 12″ | 300 | 7″ | 180 |
20-24 | 24″ | 600 | 12-5/16″ | 310 |
20-36** | 36″ | 910 | 20″ | 20-36** |
* Length of blade from the inner edge of the beam to the end of the blade .
** 36″ (910mm) and larger size squares have special screws to secure the
blade to the beam .
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