/ Precision Measuring Tools / Precision Hand Tools / Squares / Solid Squares / 20-36 * Not actual product image 50142 20-36 Master Precision Square 50142 Other similar products The Starrett 20 Master Precision Square is the finest precision-checking square. Squareness accuracy to .0001" (0.0025mm) every 6" (150mm). This hardened steel square is 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. 36" (910mm) Blade, 20" (500mm) Beam. Features Specifications Parts Downloads Contact Starrett Features 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. Specifications Blade Length (in): 36" Blade Length (mm): 910mm Beam Length (in): 20" Beam Length (mm): 500mm Material: Steel Parts Member of Kit Item #DescriptionPart No.QtyInformation 10BEAM #20-3605977-01 20BLADE #20-3605979-01 30LOCK #20-3605981-01 40SCREW, 7/16-14 SHCS X 3" LONG05982-01 50CLAMP BOLT05983-04 60WSHR,.390X.750X.06205984-04 70WSHR,.453X.750X.06305985-01 Downloads 2D Dimensional Drawing (PDF) .pdf 72.68 kb