Forensic Comparison

Suizan SZA-9.5-RYOBA 9.5-Inch Ryoba Pull Saw VS Spear & Jackson 9515K 22-Inch Traditional Skew Back Saw

REF #740
AA

Suizan SZA-9.5-RYOBA 9.5-Inch Ryoba Pull Saw

Cost Per Year
$18.87/yr
MSRP
$31
Horizon
15.00 Years
Waste Factor
5x Units Avoided
Full Audit
REF #738
AAA

Spear & Jackson 9515K 22-Inch Traditional Skew Back Saw

Cost Per Year
$8.85/yr
MSRP
$54.99
Horizon
40.00 Years
Waste Factor
6x Units Avoided
Full Audit

Financial Trajectory

Audit Winner
Spear & Jackson 9515K 22-Inch Traditional Skew Back Saw
NPV Cost:$72
Year 30
$0$18$36$54$72Yr 0Yr 10Yr 20Yr 30Yr 40Yr 50
Winner
Disposable Baseline
MetricSuizan SZA-9.5-RYOBA 9.5-Inch Ryoba Pull SawSpear & Jackson 9515K 22-Inch Traditional Skew Back Saw
MSRP$31$54.99
20-Year TCO$281$132
Cost Per Year$18.87/yr$8.85/yr
Waste Factor5x Avoided6x Avoided

Failure Threat Matrix: Suizan SZA-9.5-RYOBA 9.5-Inch Ryoba Pull Saw

  • Tooth snapping
    Risk: Medium
    Apply pressure only on the pull stroke; do not push or twist the blade while engaged in wood.
  • Surface oxidation (Rust)
    Risk: High (if uncleaned)
    Wipe blade clean and apply a thin coat of mineral or camellia oil after every use.
  • Blade kinking
    Risk: Low
    Ensure workpieces are properly secured to prevent binding that causes the thin steel to flex and kink.

Failure Threat Matrix: Spear & Jackson 9515K 22-Inch Traditional Skew Back Saw

  • Surface Oxidation (Rust)
    Risk: High (if unmaintained)
    Apply a light coat of oil or wax to the blade after each use and store in a dry environment.
  • Teeth Dulling
    Risk: Certain (with use)
    Resharpen using a standard taper file and check tooth set every 1-2 years.

Efficiency Verdict

Analysis confirms that Spear & Jackson 9515K 22-Inch Traditional Skew Back Saw provides the superior ROI over a 20-year horizon, saving approximately $10.02/yr compared to the alternative.