Forensic Comparison

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

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
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

Financial Trajectory

Audit Winner
Suizan SZA-9.5-RYOBA 9.5-Inch Ryoba Pull Saw
NPV Cost:$72
Day 1
$0$18$36$54$72Yr 0Yr 10Yr 20Yr 30Yr 40Yr 50
Winner
Disposable Baseline
MetricSpear & Jackson 9515K 22-Inch Traditional Skew Back SawSuizan SZA-9.5-RYOBA 9.5-Inch Ryoba Pull Saw
MSRP$54.99$31
20-Year TCO$132$281
Cost Per Year$8.85/yr$18.87/yr
Waste Factor6x Avoided5x Avoided

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.

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.

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.