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The Starrett 20-12 Master Precision Square is engineered for machinists, inspectors, and toolmakers who demand absolute accuracy in layout, setup, and verification work. Crafted from hardened, ground, and lapped steel, this square offers one of the highest levels of precision available, making it a trusted standard in manufacturing and inspection labs worldwide.
Featuring a 12" blade and a solid, rigid beam, the Starrett 20-12 maintains exacting accuracy of up to 0.0001", ensuring dependable performance for even the most critical tolerances. Whether for setting up machinery, checking squareness, or performing high-precision layout work, this master square delivers uncompromising reliability and long-lasting durability.
| Model | 20-12 |
| Blade Length | 12" |
| Beam Length | Approximately 8" |
| Accuracy | ±0.0001" (per 6") |
| Material | Hardened steel, ground and lapped |
| Type | Type: Master Precision Square |
| Graduations | None (solid reference edges) |
Shipping is FREE on all orders under 70 pounds shipped to the continental USA.
Freight shipping will be charged on larger, heavier items.
Shipping is FREE on all orders under 70 pounds shipped to the continental USA.
Freight shipping will be charged on larger, heavier items.
Price Match Guarantee.
Best prices online guaranteed.
30 Day Easy Returns.
Se Habla Español - Falamos Português
We will beat ANY price found online! Reach out to us for more information by calling at (617) 398-7852 or emailing us at support@precisionengineeringsupply.com.
Free 30 day returns! We pride ourselves in helping you with your needs Please reach out by calling at (617) 398-7852 or emailing us at support@precisionengineeringsupply.com to start your return.
Enjoy flexible payment options with Affirm. Split your purchase into easy, interest-free installments or choose a financing plan that fits your budget — all available directly at checkout.
The Starrett 20-12 Master Precision Square is engineered for machinists, inspectors, and toolmakers who demand absolute accuracy in layout, setup, and verification work. Crafted from hardened, ground, and lapped steel, this square offers one of the highest levels of precision available, making it a trusted standard in manufacturing and inspection labs worldwide.
Featuring a 12" blade and a solid, rigid beam, the Starrett 20-12 maintains exacting accuracy of up to 0.0001", ensuring dependable performance for even the most critical tolerances. Whether for setting up machinery, checking squareness, or performing high-precision layout work, this master square delivers uncompromising reliability and long-lasting durability.
| Model | 20-12 |
| Blade Length | 12" |
| Beam Length | Approximately 8" |
| Accuracy | ±0.0001" (per 6") |
| Material | Hardened steel, ground and lapped |
| Type | Type: Master Precision Square |
| Graduations | None (solid reference edges) |
Shipping is FREE on all orders under 70 pounds shipped to the continental USA.
Freight shipping will be charged on larger, heavier items.
Shipping is FREE on all orders under 70 pounds shipped to the continental USA.
Freight shipping will be charged on larger, heavier items.
Price Match Guarantee.
Best prices online guaranteed.
30 Day Easy Returns.
Se Habla Español - Falamos Português
We will beat ANY price found online! Reach out to us for more information by calling at (617) 398-7852 or emailing us at support@precisionengineeringsupply.com.
Free 30 day returns! We pride ourselves in helping you with your needs Please reach out by calling at (617) 398-7852 or emailing us at support@precisionengineeringsupply.com to start your return.
Enjoy flexible payment options with Affirm. Split your purchase into easy, interest-free installments or choose a financing plan that fits your budget — all available directly at checkout.
Starrett 20-12 Master Precision Square 12" Blade Catalog