$ 445,00
$ 445,00
$ 445,00
Alpha® PSG-658 Pneumatic Stone Grinder (5/8"-11)
The Alpha® PSG-658 is a high-performance wet pneumatic stone grinder built from the ground up for stone fabrication — not a retrofitted dry angle grinder. A 5/8"-11 spindle drives polishing pads, Vexcel rigid discs and Spike resin-removal discs at 8,500 RPM, while the center water-feed system delivers ample water through four passage holes in the shower bolt to keep dust down and extend wheel life. At 2.9 lbs (1.3 kg) the PSG-658 is smaller and lighter than most electric angle grinders and ships turn-key with 15 ft (4.5 m) all-weather air and water hoses.
Features
- Designed from scratch as an industrial wet grinding tool for stone — not a retrofitted dry grinder
- 5/8"-11 spindle drives standard polishing pads, Vexcel rigid discs and Spike resin-removal discs
- Unique center water-feed system with 4-hole shower bolt cools both faces of the wheel
- 8,500 RPM no-load speed at just 15 CFM @ 85 PSI — runs on a standard shop compressor
- Lightweight 2.9 lbs (1.3 kg) and only 7-1/2" (190.5 mm) long for all-day handling
- Spring-return throttle prevents accidental starts; composite end case keeps the operator's hand warm
- Silicon gear head cover provides cushion and thermal insulation in cold environments
- All-weather 15 ft (4.5 m) hoses rated -40°F to +140°F (-40°C to +60°C)
- One-year tool warranty (see manual for details)
| Part No. | Thread | Disc Size | Air Consumption | UPC |
|---|---|---|---|---|
| PSG-658 | 5/8"-11 | 6" (150 mm) max | 15 CFM (425 L/min) | 749173430176 |
- Connect the PSG-658 to a compressor delivering at least 15 CFM at 85 PSI (6 Bar); larger compressors will keep multiple tools running simultaneously.
- Hook up the water hose to a standard supply using the included quick coupler with shut-off valve; confirm water reaches the shower bolt and exits all four passage holes.
- Mount the reversible side handle in the position best suited for the application (left or right of the body).
- Thread the appropriate 5/8"-11 disc or pad onto the spindle and tighten using the included wrench.
- For grinding, Alpha® recommends 5" Vexcel Rigid Disc 25 grit (heavy grinding) or 35 grit (general shaping); for resin removal use the 5" Spike Disc 35 grit.
- For profile finishing, switch to a VFlex Flexible Sanding Disc in 35, 50 or 80 grit.
- For cutting applications, fit a cutting blade with HydroQuad™ Adapter so water is delivered to both sides of the blade.
- At shift end, add a few drops of AIR-008 rust inhibitor oil at the oil port and slowly introduce air pressure to lubricate the rotor and cylinder.
6" Pneumatic Stone Grinder (5/8"-11 spindle) — PSG-658
| Part No. | PSG-658 |
| UPC | 749173430176 |
| Type | 6" Pneumatic Stone Grinder (5/8"-11 spindle) |
| Packaged Weight | 8.35 lbs |
| Package Dimensions | 13.5" x 11.5" x 3.5" |
| Commodity Code | 8467.11.5090 |
| Country of Origin | Japan |
| Property | Detail |
|---|---|
| Spindle | 5/8"-11 |
| No-Load Speed | 8,500 RPM |
| Air Pressure | 85 PSI (6 Bar) |
| Air Consumption | 15 CFM (425 L/min) |
| Air Inlet | 1/4" BSPP |
| Water Inlet | 1/8" BSPP |
| Tool Weight | 2.9 lbs (1.3 kg) |
| Tool Length | 7-1/2" (190.5 mm) |
| Hose Length | 15 ft (4.5 m), water + air; -40°F to +140°F |
| Country of Origin | Japan |
| Status | Discontinued by manufacturer — spare parts available |
| Warranty | One year (see manual) |
What causes the PSG-658 to bog down even with an adequate compressor?
Multiple pieces of equipment sharing the compressed-air line may reduce available airflow. Verify total CFM demand for everything connected to the line and add reserve-tank capacity if needed.
How is the PSG-658 different from competing wet grinders?
Most wet grinders are dry metal angle grinders retrofitted with external water feeds. The PSG-658 was designed from scratch as a stone-industry wet grinder, with a center water-feed system that cools both faces of the wheel.
Can the PSG-658 perform cutting operations?
Yes. Alpha® recommends using a cutting blade with the HydroQuad™ Adapter so water is delivered to both sides of the blade.
What is the warranty period?
One-year tool warranty. See the manual for full details.
Can the PSG-658 run dry?
Yes, but Alpha® recommends pairing it with an Ecoguard W5 or W6 dust-collection cover and a HEPA vacuum to stay compliant with the OSHA respirable-silica rule.
Does Alpha® offer an electric high-speed grinder with center water feed?
No. Alpha® offers the WSPKIT to convert popular electric grinders into wet cutting / grinding / profiling tools instead.
How much rust inhibitor oil should I add?
Only a few drops at shift end. Slowly introduce air pressure to lubricate the rotor and cylinder. Full air pressure will simply expel the oil through the exhaust.
Which discs does Alpha® recommend for grinding?
5" Vexcel Rigid Disc 25 grit (VDR5025) for heavy grinding, 35 grit (VDR5035) for general shaping, and the 5" Spike Disc 35 grit (VCS5035) for resin/net removal.
Are flexible discs available for profile finishing?
Yes. The 5" VFlex Flexible Sanding Disc (VDF50xx series) ships in 35, 50 or 80 grit for round-over edges and vanity rim cleanup.
No product-specific videos are currently available from the manufacturer or DST.
⚠ WARNING: Cancer and Reproductive Harm — www.P65Warnings.ca.gov. Always wear appropriate PPE.