One of McConnel’s most popular mowers, the SR420 is lighter and slightly more manoeuvrable than the SR15. It also features anti-scalp discs, a floating linkage system, deck protection rings, and a wider choice of cutting heights.

Ideal for large-scale farmers, local government teams, and professional mowing contractors, SR series machines can be used in a huge variety of applications from airports and sports venues to pasture and stubble.


McConnel’s range of high-performance delta wing rotary mowers has been designed to deliver peak performance over the ground with working widths from 4.2 to 8.2m, flexible wings, and powerful triple rotors.

Hardened updraft swinging blades ensure an effective cutting capacity of up to 50mm, while hydraulically folding wings enable a fast and smooth transition from transport to working position.

Key features

  • 4.2m working widths
  • Floating linkage system
  • 57 degrees of wing movement (+45o up, -12o down)
  • Heavy-duty gearboxes
  • 1000rpm wide angle PTO (check)
  • Slip Clutch Protection
  • Front and rear chain guards
  • Hardened updraft swinging blades
  • Cutting heights from 10m to 400mm
  • 100mm cutting capacity
  • Six blades
  • Overlapping blades
  • 4,800m per minute blade speed
  • Low tractor hp requirement (70hp)


See the SR420 flex wing mower in action:


Fast and effective

The lightest and most manoeuvrable machine in the SR range, the SR420 has a range of cutting heights from 10mm to 400mm and anti-scalp discs to protect the blades and ensure an attractive finish.


McConnel’s SR series machines operate quickly and effectively while delivering an attractive cut. The SR420’s 57 degrees of flexibility also ensures it closely follows the contours of the ground making it equally as effective in undulating terrain.


  • The easiest SR series machine to master
  • McConnel’s most productive range of mowers
  • Effective in a huge range of work environments
  • Attractive finish
  • Proven track record for reliability
  • Customisable with a range of blade, hitch and shredder options
  • Wide range of cutting heights
  • Enables operators to switch quickly to and from the transport position
Model SR420
 Working width 4.45m (14′ 7″)
HP Requirement 80hp (60kW)
Machine weight 1875kg (4134lbs)
Attachment 3-point linkage
Cutting height
25mm – 400mm (1″ – 1′ 4″)
Cutting capacity
100mm (4″)
Deck height*  0.73m (2′ 5″)
Overall width
4.71m (15′ 6″)
Overall length 3.62m (11′ 11″)
Transport width 2.8m / 9' 2"
Transport height 2.0m / 6' 6"
PTO speed
Deck construction  All welded construction
Deck material thickness  4mm (3/16″)
Skid construction  Replaceable bolt on skid shoes
Side skirt material thickness  6mm (1/4″)
Driveline  ASAE Category 5
Overrun clutch on input PTO shaft and 2-plate slip clutches on wing driveshafts
Number of blades
6 x 10mm (3/8″) 30 Carbon Boron hardened and tempered. Free swinging high lift – low friction
Blade bolts  M24 C/W shank grade 8.8
Number of rotors 3
Blade overlap
Blade tip speed
75 m/s (14764 fpm)
Hydraulic wing flex +45o up, -12o down
Anti-scalp dish 5mm (3/16″) round pan with blade holder bar
Input shaft  1-3/8″ Z6 input shaft
Gearbox [splitter]  Splitter - Cast Iron housing
Gearbox [rotor]  Rotor x 3 - Cast Iron housing
Gearbox oil capacity [splitter gearbox]  4.3 litres (7.6 pints)
Gearbox oil capacity [centre gearbox]  n/a
Gearbox oil capacity [rotor gearboxes]  TBC
Wheels and Tyres 4 wheels - 5.00-8 rubber tyre with steel hub
Wheel mount assembly  Welded box section arm and caster fork with 360 degree swivel
Front guard  Single, two-piece chain guard
Rear guard  Single chain guard
*Underside of deck to skid