Place of Origin: Hebei, China

Warranty: 1 year

Customized Support: OEM, ODM, OBM

Brand Name: Storan

Model Number: 2010

Material: Cast iron

Accuracy: Customized

Operation Mode: Customized

Item Weight: Customized

Capacity: Customized

Material Grade: HT200–300

Specification: See attached form or customize

Surface Treatment: Hand-scraped or finish-milling

Foundry Process: Sand casting

Painting: Primer painting

Surface Coating: Working surface covered with pickling oil

Working Temperature: (20±5)℃

Precision Grade: 1–3

Custom Design: Available

Packaging: Plywood box

Lead Time

* I-shaped

* Made from high-quality cast iron.

* Casting stress relieved to remove internal stresses.

* Available in three accuracy grades: Grades 0, 1 and 2.

* Standard packaging is a plywood box. Fine packaging cases are available on request at an additional cost.

Material: HT200–300

Specification: See attached form or customize

Surface Treatment: Hand-scraped or finish-milling

Foundry Process: Sand casting

Painting: Primer painting

Surface Coating: Working surface covered with pickling oil; non-working surface covered with antirust paint

Working Temperature: (20±5)℃

Precision Grade: 1–3

Custom Design: Available

Packaging: Plywood box

Cast Iron vs. Steel Straight Rulers: Durability & Precision Comparison

Choosing straight rulers for industrial alignment depends on the material’s performance. Storan compares cast iron and steel metal straightedge tools to show why our cast iron ruler straight edge solutions lead in both durability and precision.

1. Strength & Vibration Resistance

Cast Iron (HT200–HT300):

With 180–240HB hardness and 300MPa tensile strength, our cast iron straight edge ruler with handle resists wear 3x better than mild steel. Its microstructure dampens vibrations by 40%, which is critical for CNC machine alignment or press tool setups where machinery vibrations can cause errors.

Steel:

Softer (130–180HB) and more prone to scratches (Ra ≥ 3.2 μm), steel straight rulers lose accuracy faster in abrasive environments, lacking the robustness of cast iron.

2. Long-Term Precision Stability

Thermal Consistency:

Cast iron’s low thermal expansion (11.6×10⁻⁶/°C) helps maintain Class 0 straightness (≤0.001 mm/m for 1000 mm), staying stable across 10°C–40°C. Steel expands 25% more, which can risk ±5 μm errors in temperature-sensitive tasks such as aerospace component alignment.

Surface Durability:

Stress-relieved and optionally hand-scraped, cast iron metal straightedges retain Ra ≤ 1.6 μm roughness through 10,000 cycles. Steel rulers can lose 20% flatness after 5,000 cycles due to micro-deformations.

3. Corrosion Protection & Practical Design

Anti-Corrosion Finish:

A 5 μm pickling oil coating extends the cast iron ruler’s straight edge life by 2x in humid workshops, outperforming steel rulers that may rust or pit due to coolants.

Ergonomic Features:

The 30–50 mm thick base and rubber handle reduce fatigue, while 500–3000 mm sizes (custom to 6000 mm) help avoid warping issues often seen in steel at lengths above 2000 mm.

4. When to Choose Cast Iron

Ideal for:

Heavy-duty environments (foundries, machine shops) involving impacts and temperature fluctuations.
Precision-critical tasks such as CMM calibration or large casting inspection, where steel limitations could lead to costly rework.

While steel straight rulers can be suitable for light use, Storan’s cast iron metal straightedge and straight edge ruler with handle deliver 3x longer service life, superior vibration control, and improved thermal stability. Backed by a 1-year warranty and available custom solutions, they help reduce total cost of ownership for industrial alignment. Explore our range today and experience the precision difference of premium cast iron.

How Straight Rulers Aid in Hand-Scraping Bearing Surfaces

Hand-scraping bearing surfaces requires micron-level precision, and straight rulers are essential for guiding accuracy. Storan’s ruler straight edge solutions enhance this process by providing rigidity and durability that help transform rough surfaces into high-performance interfaces. Here’s how our tools elevate your workflow:

1. Precision Foundation: Straight Edge Alignment

A metal straight edge ruler is key for verifying flatness:

Surface Inspection: Place a Storan stainless steel straight edge ruler (Ra ≤ 1.6 μm) to identify high spots through light gaps, supporting Class 2 straightness (≤ 0.02 mm/m for 1000 mm). This guides precise scraping to achieve 25–30 contact points/25×25 mm, optimizing load distribution in bearings.
Guided Scraping: The rigid edge of our ruler straight edge helps maintain consistent scraper angles, preventing uneven cuts. In steam turbines or CNC spindles, this can reduce friction by 30% and double component life.

2. Material Solutions for Diverse Needs

Storan offers tailored straight rulers:

Cast Iron Straight Edges (HT200–HT300): With 180–240HB hardness, they resist deflection under 50 kg pressure and maintain ±5 μm straightness over 300 mm—ideal for heavy-duty applications such as diesel engine bearings, where vibrations won’t affect alignment.
Stainless Steel Straight Edge Rulers (304 Grade): Corrosion-resistant with 20 μm nickel-chrome plating, they deliver Class 3 straightness (≤ 0.05 mm/m) for marine or medical environments, protecting against coolant and ensuring precision in pump or medical device bearings.

3. Efficiency & Accuracy in Design

Our metal straight edge ruler optimizes workflow:

Ergonomic Design: A 30 mm thick base and rubber grip reduce fatigue during long scraping sessions. A weighted balance also improves stability on vertical and horizontal surfaces—critical for aligning large bearings in wind turbines or presses.
Calibration Assurance: Every ruler meets GB/T 6091-2004 standards via 3D laser scanning, providing a traceable reference for ISO 1101 compliance.

4. Storan’s Scraping Advantages

Custom Solutions: Bespoke designs such as a 2000 mm ruler straight edge with 120° bevels for curved bearings (4–6 week lead time) support aerospace applications or unique geometries.
Durability: Cast iron models feature 5 μm pickling oil for rust resistance; stainless steel is passivated, extending tool life by 2x in harsh environments.
Warranty: 1-year protection against dimensional drift supports confidence in achieving ≤ 0.01 mm/m parallelism, helping minimize rework for high-value machinery.

Hand-scraping combines skill and precision, and Storan’s straight rulers deliver both. From corrosion-resistant stainless steel straight edge rulers to rugged cast iron models, our tools provide the accuracy and durability needed for critical bearing work. Upgrade your craft with tools designed for modern manufacturing—where every scrape counts toward machinery reliability and performance.