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Starrett 12" Long Blade Precision Machinist Master Square (Steel Model No. 20)
This isn't a beveled square, and isn't a square with graduations or a scale on it. This is a precision machinist master square. See description below.
Machinist square is in fair to good condition overall. I'm unable to speak to the accuracy, but there doesn't appear to be any damage or offset in the blade. It does however have a lot of scratches, scuffs, some discoloration where corrosion was polished off, and some dings, nicks, burrs and dents on the edges. See photos for cosmetic detail.From Manufacturer:
Starrett Master Precision Square, 12" x 7", EDP 50136 - 20-12
The Starrett 20 Master Precision Square is the finest precision-checking square – not graduated. 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. 12” (300mm) Blade, 7” (180mm) Beam throughout.
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): 12"
- Blade Length (mm): 300mm
- Beam Length (in): 7"
- Beam Length (mm): 180mm
- Material: Steel
