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A neutral, side-by-side reference of each model's stated specifications. MowerFacts does not rank one model above another — read the values and decide what fits your needs.
Best suited for
What each model is built for, from its duty class and key specs. This is a neutral reference — MowerFacts does not rank one model above another.
- Scag SWZ Hydro-Drive — commercial: daily paid use and high acreage; 36-inch deck; gas powered
- Scag SFC-21 — commercial: daily paid use and high acreage; 21-inch deck; gas powered
| Spec | SWZ Hydro-Drive Scag · Push / Walk-Behind |
SFC-21 Scag · Push / Walk-Behind |
|---|---|---|
| Engine | ||
| Power Source | gas | gas |
| Displacement | — | 9.9 ci (163 cc) |
| Engine Power | 14 hp | 4 hp |
| Cylinders | — | 1 |
| Engine Make | Kawasaki® FS Series | Honda |
| Deck | ||
| Cutting Width | 36 in (914 mm) | 21 in (533 mm) |
| Min Cut Height | 1.7 in (44 mm) | 1.5 in (38 mm) |
| Max Cut Height | 4.5 in (114 mm) | 4.5 in (114 mm) |
| Deck Construction | Dual-plate cutter deck constructed of 2 steel plates. Reinforcement plate at cutter deck spindles. | 14 gauge deck with 14-gauge replaceable guards for strength and longevity. Deep draw stamped. |
| Drive | ||
| Drive System | Dual Pump and Motor | — |
| Transmission | — | GT MG 512 transmission, 3-speed |
| Ground Speed | 7.4 mph | 4.2 mph |
| Reverse Speed | 3 mph | — |
| Dimensions | ||
| Weight | 515 lbs (233.6 kg) | 136 lbs (61.7 kg) |
| Fuel Capacity | 5.5 gal (20.8 L) | 0.4 gal (1.4 L) |
SWZ Hydro-Drive: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — scag.com.
SFC-21: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — scag.com.
Independent reference database. Specs compiled from manufacturer sources and normalized for comparison; verify with the manufacturer or dealer before purchase.