Stanley Tools GR29 Hydraulic Underwater Grinder

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The Stanley Hydraulics Underwater Grinder GR29 is used by commercial divers for top, face, and side grinding using 9 inch (228.6 mm) diameter wheels. Wire brushes can also be used and depressed-center wheels with an optional adapter. This hydraulic underwater tool can be used by commercial divers to clean off barnacles or coral off of the bottom of the ships.

Hose whips and quick disconnect couplers are sold separately. Quotes for the grinder will show and include the hoses and quick disconnects.

Stanley’s Underwater Hydraulic Grinder GR29 can be used by commercial divers for underwater grinding and cleaning with either cup or standard grinding wheels, wire or nylon brushes. Grinding wheels are sold separately.

The integral Stanley Hyrevz gear motor is manufactured to exacting standards to deliver maximum efficiency for the Stanley Hydraulics Underwater Grinder GR29. The plastisol covering the handle transmits very little heat. The plastisol gives a more comfortable grip to the Stanley Hydraulic Underwater GR29. There are two positions available for the assist handle to be conveniently placed by the commercial diver. Either position is at a most comfortable handling position from the valve handle.

The wheel guard is adjustable. By loosening the clamp screw the guard may be rotated to any convenient position by the commercial diver.


  • Adjustable wheel guard

  • 4-10 gpm (15-38 lpm) operating range at the commercial diver end

  • 2700 rpm @ 10 gpm (38 lpm)

  • Hosewhips and quick disconnect couplers are sold separately

  • Two Stanley Tools 12 in. Pigtail Hose P/N: 01652 need to be purchased for the underwater tool to be operational

  • For quick disconnect couplers, please purchase Stanley Tools Quick Disconnect Face Coupler Set 3/8 in. NPT P/N: 03971

  • Grinding wheels are sold separately


  • Capacity: 9 in. wheel on 5/8 in. -11 arbor

  • Rpm: 2700 @ 10 gpm (2700 @ 38 gpm)

  • Weight (with guard): 14 lbs. (6.4 kg)

  • Length: 11 in. (28 cm)

  • Width (with guard): 12 in. (30.5 cm)

  • Pressure: 1000 – 2500 psi (70-176 bar)

  • Flow range: 4-10 gpm (15-38 lpm) at the commercial diver

  • Optimum flow: 10 gpm (38 lpm)

  • Porting: -8 SAE O-ring

  • Motor: Stanley Hyrevz Gear

Stanley Hydraulic Underwater Grinder GR29 – P/N: GR29310 Includes: