Introduction
This manual provides essential instructions for the proper use and care of your Starrett 12 Inch Spring-Tempered Precision Steel Rule, Model C604R-12. Manufactured from fine quality alloy steel to the highest precision standards, this rule is designed for accurate and reliable measurement in various applications. Please read this manual thoroughly before use to ensure optimal performance and longevity of your tool.
Key Features
- Spring-Tempered Alloy Steel: Constructed from durable alloy steel for flexibility and resilience.
- Satin Chrome Finish: Provides a no-glare surface for improved readability and corrosion resistance.
- Quick Reading Graduations: Designed for fast and accurate measurements.
- Double Row Inch Figures: Features a double row of inch figures, with each edge representing the bottom edge reading from left to right (for rules 1 inch and wider).
- Advanced, Staggered Graduations: Enhances readability and precision.
- Compact Style: Easy to handle and store.

Image: Overview of the Starrett Precision Steel Rule highlighting its key features and specifications.
Setup and Preparation
The Starrett Precision Steel Rule is ready for immediate use upon unboxing. No assembly or calibration is required. Ensure the rule is clean and free from any debris or oils before each use to maintain accuracy.
- Unpack: Carefully remove the rule from its packaging.
- Inspect: Check the rule for any visible damage or manufacturing defects. If any are found, contact customer support.
- Clean: Wipe the rule with a soft, dry cloth to remove any dust or fingerprints.
Operating Instructions
Using the Starrett Precision Steel Rule for accurate measurements is straightforward. Follow these steps for best results:
- Positioning: Place the rule firmly against the object you wish to measure. Ensure the edge of the rule is flush with the starting point of your measurement.
- Reading Measurements: Read the measurement directly from the rule's graduations. The satin chrome finish and distinct numbering style are designed for easy readability. For precise readings, ensure your eye is directly above the mark to avoid parallax error.
- Using Different Edges: The rule features different graduations on its edges. Select the appropriate edge for the required precision (e.g., 1/8, 1/16, 1/32, 1/64 inch).
- Marking: Use a sharp pencil or marking tool to transfer measurements accurately from the rule to your workpiece.

Image: A Starrett rule being used to measure a piece of wood, demonstrating its application.

Image: A Starrett rule positioned next to a bandsaw blade, illustrating its use in a workshop for precise alignment or measurement during cutting operations.
Care and Maintenance
Proper care and maintenance will ensure the accuracy and longevity of your Starrett Precision Steel Rule.
- Cleaning: After each use, wipe the rule clean with a soft, dry cloth to remove any dirt, dust, or moisture. For stubborn grime, a mild cleaning solution and a soft cloth can be used, followed by thorough drying.
- Storage: Store the rule in a dry environment to prevent rust. Avoid storing it with other tools that could scratch or damage its surface or graduations.
- Avoid Bending: While spring-tempered, excessive bending or misuse can permanently deform the rule, affecting its accuracy.
- Protection: The satin chrome finish offers some corrosion resistance, but prolonged exposure to harsh chemicals or moisture should be avoided.
Troubleshooting
The Starrett Precision Steel Rule is a simple, durable tool with minimal components. Most issues relate to improper handling or environmental factors.
| Problem | Possible Cause | Solution |
|---|---|---|
| Inaccurate Measurements | Rule not flush with workpiece; parallax error; rule is bent or damaged; debris on rule. | Ensure rule is firmly and correctly positioned. Read directly above the mark. Inspect rule for damage; replace if bent. Clean rule thoroughly. |
| Rust or Corrosion | Exposure to moisture or corrosive substances; improper storage. | Clean and dry the rule immediately after use. Store in a dry environment. Apply a light coat of rust preventative oil if storing for extended periods in humid conditions. |
| Difficulty Reading Graduations | Poor lighting; dirt or grime on the surface. | Ensure adequate lighting. Clean the rule's surface with a soft cloth. |
Specifications
| Attribute | Detail |
|---|---|
| Model Number | C604R-12 |
| Brand | Starrett |
| Material | Alloy Steel |
| Length | 12 Inches |
| Finish | Satin Chrome (No-Glare) |
| Style | Compact |
| Item Weight | 1 Pound |
| Country of Origin | USA |
| UPC | 049659526790 |

Image: Close-up view of the Starrett rule's clear and distinct graduations, emphasizing readability.

Image: A Starrett rule being held, showcasing its no-glare satin chrome finish for enhanced visibility.

Image: A 'Made in USA' label, indicating the country of origin for the Starrett rule.
Warranty and Support
Starrett products are known for their quality and durability. For specific warranty information, please refer to the official Starrett website or contact their customer service directly. Keep your purchase receipt for warranty claims.
For technical assistance, product inquiries, or to locate authorized service centers, please visit the official Starrett website: www.starrett.com





