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Masport Pro Power ST S21 Utility 850

Push / Walk-Behind mower · Model 572857 · Residential-duty · Gas

A$999 Masport Australia RRP

Recommended retail price in Australian dollars, read 20 Oct 2026 from the Masport Australia product page. Whether it includes GST is not stated on the page.

Sold in Australia — listed on masport.com, checked 20 Oct 2026.

Dealers set the final price; delivery, assembly and any local offer are extra and are not tracked here.

The Masport Pro Power ST S21 Utility 850 is a residential-grade gas walk-behind mower, suited to small-to-mid home lawns, with a 21-inch deck and a 190cc engine. It weighs 67.5 lb (30.6 kg).

At a glance

Power Source
gas
Cutting Width
20.9 in (530 mm)
Displacement
11.6 ci (190 cc)
Weight
67 lbs (30.6 kg)
Compare this mower: Pick another Masport push / walk-behind or pick from every push / walk-behind mower sold in Australia   or quick compare: vs 100 ST 2'n1 · vs 200 ST 3'n1 · vs 2'n1 Time Saver - DOV
Compare similar mowers See how this mower compares with machines of a similar size and purpose.
  • Bushranger 53TLU7 Utility Mower
    Deck 533 mm (21 in) · Air cooled, single cylinder, OHV, vertical shaft, normally aspirated four stroke petrol engine, 196 cc · RRP A$689
    Weight 35 kg (77 lbs) (this model: 30.6 kg (67 lbs))
    Why: Same class: push / walk-behind · 21 in deck, within 2 in of this model's 20.9 in · Gas engine, like this model · Residential-duty, like this model · By Bushranger, a different maker
    Compare with the Pro Power ST S21 Utility 850 ›
  • Bushranger 53TKU7 Utility Mower
    Deck 533 mm (21 in) · Air cooled, single cylinder, OHV, vertical shaft, normally aspirated four stroke petrol engine, 173 cc · RRP A$789
    Weight 35 kg (77 lbs) (this model: 30.6 kg (67 lbs))Displacement 173 cc (10.6 ci) (this model: 190 cc (11.6 ci))
    Why: Same class: push / walk-behind · 21 in deck, within 2 in of this model's 20.9 in · Gas engine, like this model · Residential-duty, like this model · By Bushranger, a different maker
    Compare with the Pro Power ST S21 Utility 850 ›
  • Cox Utility 21 Workhorse 21 in
    Deck 533 mm (21 in) · Kohler Kohler XTX775 · RRP A$699
    Weight 28 kg (62 lbs) (this model: 30.6 kg (67 lbs))
    Why: Same class: push / walk-behind · 21 in deck, within 2 in of this model's 20.9 in · Gas engine, like this model · Residential-duty, like this model · By Cox, a different maker
    Compare with the Pro Power ST S21 Utility 850 ›
  • Honda HRN536
    Deck 530 mm (20.9 in) · 166 cc · RRP A$1,299
    Weight 40 kg (88 lbs) (this model: 30.6 kg (67 lbs))Max cut height 100 mm (3.9 in) (this model: 78 mm (3.1 in))
    Why: Same class: push / walk-behind · Same 20.9 in deck · Gas engine, like this model · Residential-duty, like this model · By Honda, a different maker
    Compare with the Pro Power ST S21 Utility 850 ›
  • Honda HRX217
    Deck 530 mm (20.9 in) · 201 cc · RRP A$1,799
    Weight 47.9 kg (106 lbs) (this model: 30.6 kg (67 lbs))Max cut height 101 mm (4 in) (this model: 78 mm (3.1 in))
    Why: Same class: push / walk-behind · Same 20.9 in deck · Gas engine, like this model · Residential-duty, like this model · By Honda, a different maker
    Compare with the Pro Power ST S21 Utility 850 ›

Chosen by stated rules, not opinion: same class, a deck within 2 in of this one, the same kind of power and a compatible duty class, then the closest power, weight and price, with other makers preferred. Figures are the manufacturers’ published ones; nothing is estimated.

Engine

Masport Pro Power ST S21 Utility 850 engine specifications
Power Sourcegas
Displacement11.6 ci (190 cc)
Start TypeReadyStart
Engine MakeBriggs & Stratton
Engine ModelOHV Series 850 Professional IC

Deck

Masport Pro Power ST S21 Utility 850 deck specifications
Cutting Width20.9 in (530 mm)
Min Cut Height0.5 in (13 mm)
Max Cut Height3.1 in (78 mm)
Deck MaterialHeavy Duty Steel
Blades4
Cut Positions10
DischargeSide Discharge

Drive

Masport Pro Power ST S21 Utility 850 drive specifications
Drive SystemPush

Dimensions

Masport Pro Power ST S21 Utility 850 dimensions specifications
Weight67 lbs (30.6 kg)

Similar models

Other push / walk-behind mowers with comparable specs — including other brands — that buyers cross-shop with the Pro Power ST S21 Utility 850.

54V XR FLEXVOLT Push Lawn Mower (Tool Only) DeWalt · 20.9 in (530 mm)
2x18V XR Self-Propelled Lawn Mower - 2 x 8 Ah DeWalt · 20.9 in (530 mm)
36V HP Brushless 53cm Self-Propelled Lawn Mower 8 Ah Kit Ryobi · 20.9 in (530 mm)
Utility 21 Workhorse 21 in Cox · 21 in (533 mm)
POWER+ 52cm Select Cut Mower with Touch Drive Self-Propelled… EGO · 20.5 in (520 mm)
POWER+ 52cm Select Cut XP Mower with Touch Drive Self-Propelled… EGO · 20.5 in (520 mm)

See all Masport mowers and specs ›

Spot a wrong spec? Suggest a correction.

Independent reference database. Specs compiled from manufacturer sources and normalized for comparison; verify with the manufacturer or dealer before purchase.

What the specs work out to

Figures MowerFacts computes from Masport’s own numbers — not published by the manufacturer.

Gate & trailer fit

  • 32 in gateFits
  • 36 in gateFits
  • 48 in gateFits

Needs at least 27 in of clearance (estimated).

Fit uses the deck width plus 6 in for the discharge chute, because Masport doesn't publish an overall width — measure before buying if a gate is tight.

Source: Masport (manufacturer) · archived copy

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