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Starrett 20-12 Master Precision Square 12" Blade

Starrett 20-12 Master Precision Square 12" Blade

by Starrett
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Call/Text Gustavo before you buy.

I personally review every order and I'm happy to answer questions about compatibility, specs, or lead times. Don't guess - let's get it right the first time.

Call / Text 617-398-7852 Email support@precisionengineeringsupply.com
Gustavo
Founder, Precision Engineering Supply
Available Mon – Fri
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$1,112.00
  • Hardened and ground steel
  • Ultra-precise master square
  • Non-adjustable solid beam
  • Precision-lapped edges
  • Satin finish
  • Includes protective case and certification
Customers rate us 4.5/5 based on 49 reviews.

Starrett 20-12 Master Precision Square 12" Blade

$1,112.00

Description

Starrett 20-12 Master Precision Square 12" Blade

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.

 

Key Features

  • Ultra-high squareness accuracy (±0.0001" per 6")
  • Hardened, ground, and lapped steel blade and beam
  • Heavy-duty, non-adjustable, solid beam design for lasting stability
  • Precision reference edge ideal for inspection and layout
  • Satin-finished blade for reduced glare and easy reading
  • Designed for machinists, toolmakers, and quality control inspections

 

Specifications

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)

 

Items Included

  • Starrett 20-12 Master Precision Square (12" blade)
  • Protective storage case
  • Factory inspection certification

 

INSIZE ISHW-L20B Webster Hardness Tester ManualStarrett 20-12 Master Precision Square 12" Blade Catalog

Shipping

Shipping is FAST & FREE on all orders shipped to the continental USA.

Why Buy From Us

Shipping is FAST & FREE on all orders shipped to the continental USA.

Best Price Guarantee. 

30 Day Easy Returns. 

Se Habla Español - Falamos Português

Pricing

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.

Returns

Easy 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.

Financing

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.

Customers are saying

4.51 ★ (49)
Verified
Have a question?

Call or Text Gustavo Before You Buy!

Every order gets my personal attention. Call before you buy and I'll make sure it's the right fit and the right price!

(617) 398-7852 support@precisionengineeringsupply.com
Gustavo
Founder and CEO
Available Mon – Fri
Description

Starrett 20-12 Master Precision Square 12" Blade

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.

 

Key Features

  • Ultra-high squareness accuracy (±0.0001" per 6")
  • Hardened, ground, and lapped steel blade and beam
  • Heavy-duty, non-adjustable, solid beam design for lasting stability
  • Precision reference edge ideal for inspection and layout
  • Satin-finished blade for reduced glare and easy reading
  • Designed for machinists, toolmakers, and quality control inspections

 

Specifications

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)

 

Items Included

  • Starrett 20-12 Master Precision Square (12" blade)
  • Protective storage case
  • Factory inspection certification

 

INSIZE ISHW-L20B Webster Hardness Tester ManualStarrett 20-12 Master Precision Square 12" Blade Catalog

Shipping

Shipping is FAST & FREE on all orders shipped to the continental USA.

Why Buy From Us

Shipping is FAST & FREE on all orders shipped to the continental USA.

Best Price Guarantee. 

30 Day Easy Returns. 

Se Habla Español - Falamos Português

Pricing

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.

Returns

Easy 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.

Financing

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.