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Alpha High-Performance 6" Pneumatic Grinder PSG-658

Alpha High-Performance 6" Pneumatic Grinder PSG-658

Regular price $365.00 USD
Regular price Sale price $365.00 USD
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Alpha® is pleased to introduce the PSG-658 Pneumatic Grinder with a 5/8”-11 spindle. This newly developed high-performance wet pneumatic stone grinder will become an essential part of the stone fabrication shop. The PSG-658 comes with a very unique center water-feed system to deliver ample water to keep the dust down on the floor and also enhance the performance of the wheel. It is smaller and lighter than electric angle grinders and offers better maneuverability along with all the safety features. It is common knowledge that electric power tools do not last very long due to the stone dust or the water splash which damages them easily. This is why most of the polishers nowadays are pneumatic-driven polishers. The Alpha® PSG-658 is a turn-key operation that comes with 15 ft. all-weather hoses and a convenient water quick coupler with shut off valve. In addition, the end case is made with a composite material to prevent freezing which is a common issue for hands, by the rear exhaust system, in consideration of operator comfort.

  • High-Performance, Pneumatic Grinding Tool
  • Central Water-Feed System Delivers Ample Water Regardless of Position
  • No-Load 8,500 RPMs
  • 15ft. All-Weather Hoses with Flexibility Down To -40°F Or +140°F
  • Newly Developed Motor Produces More Power
  • Lightweight and Ergonomically Designed for Better Maneuverability
  • Spring Return Throttle to Avoid Accidental Start
  • Composite End Case Prevents Freezing Hands
  • Unique Center Water Feed System Delivers Ample Water Through the Shower Bolt with 4 Water Passage Holes
  • Silicon Gear Head Cover Provides Cushion and Keeps Hands Warm
  • Enhanced Spindle Shaft for Easy Tool Removal (Wrench Included)
  • One Year Warranty* (*See manual for details) 


Product Details
Specification Data
Model PSG-658
Air Pressure 85 PSI (6 Bar)
Air Consumption 15 CFM (425L/min)
Weight 2.9 lbs (1.3 kgs)
No Load Speed 8,500 RPM
Air Inlet 1/4” BSPP
Water Inlet 1/8” BSPP
Spindle 5/8"-11
Length 7-1/2” (190.5mm)


Equipment Included
Item Quantity
Air Hose (15ft / 4.5m) 1
Water Hose (15ft / 4.5m) 1
Side Handle (reversible) 1
Rust Inhibitor Oil (6.7oz / 200ml) 1
Screw (w/ O-Ring Seal for Oil Port) 1
Exhaust Hose with Clamp 1
Spring Washer 1
6" Safety Guard 1
Double End Wrench (19mm / 22mm) 1
Phillips Screwdriver 1
Water Quick Coupler w/ Shut Off Valve 1
O-Ring (O-Ring for Water Valve Repair) 1
Hex Wrench (6mm) 1


Manual: PSG-658 Manual v1
Parts-Schematic: PSG-658 Parts/Schematic v0122
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