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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