Alpha Tools PSP-158 Pneumatic Polisher - PSP-158
Alpha is excited to introduce its new flagship pneumatic polisher, the PSP-158. With its power and precision speed control, it will modernize the polishing operation.
Features
- New Flagship Polisher from Alpha
- High-Performance, Pneumatic Polisher
- Powerful New Motor for Demanding Applications
- Spindle Lock for Easy/Fast Tool Changes
- Comes With 30' Kink-Free Twin-Air/Water Hose for Better Maneuverability
- All-Weather Hoses with Flexibility Down To -40°F Or +140°F
- Quarter-Turn Switches for Precise Control
- Central Water-Feed System Delivers Ample Water Regardless of Position
- No-Load RPM- 5,500
- Silicon Gear Head Cover Provides Cushion and Keeps Hands Warm
Included
- Air/Water Twin Hose Assembly (30ft / 9.1m)
- Rust Inhibitor Oil (3.4oz / 100ml)
- Exhaust Hose with Clamp
- Water Quick Coupler w/ Shut Off Valve
- Toolbox
Specifications
| Model |
PSP-158 |
| Air Pressure |
90 PSI (6.2 Bar) |
| Air Consumption Max |
28 CFM (792L/min) |
| No Load Speed |
5,500 RPM |
| Weight |
3 lbs. (1.37 kgs) |
| Air Inlet |
1/4" BSPP |
| Water Inlet |
1/8" BSPP |
| Spindle |
5/8" -11 |
| Max. HP |
0.70 HP |
What our Experts Think
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Industrial-grade pneumatic performance: Alpha Tools PSP-158 is a high-output air-powered wet polisher designed for stone fabrication, shaping, and finishing work
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Strong, consistent speed control: Runs at ~5,500 RPM no-load speed, delivering stable polishing power for granite, marble, quartz, and engineered stone
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Built for wet stone finishing: Integrated central water-feed system ensures continuous cooling and dust reduction during polishing and profiling
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Jobsite-ready durability: Lightweight (~3 lbs) but rugged design for extended professional use in fabrication shops and on-site work
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High-efficiency air system: Requires ~21 CFM at 90 PSI, making it a true shop-air tool for professional compressors
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Ergonomic control design: Includes quarter-turn air/water valves and a spindle lock for fast accessory changes and precise control
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Complete professional kit: Typically supplied with 30 ft twin air/water hose, accessories, and a transport case for field mobility
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Best for: Stone fabricators, countertop installers, and contractors needing precision wet polishing and shaping on hard materials
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Key consideration: Requires air compressor setup (not electric), plus proper water handling and operator skill for best results
Q&A
Q: What is the Alpha PSP-158 Pneumatic Polisher?
A: It is a high-performance, air-powered wet polisher designed for professional stone fabrication, polishing, shaping, and finishing of granite, marble, quartz, and engineered stone.
Q: How does the PSP-158 work?
A: It runs on compressed air (about 90 PSI) and uses a water-fed system to cool the surface during polishing, reducing dust and improving finish quality.
Q: What is the RPM of this polisher?
A: The PSP-158 operates at up to 5,500 RPM (no-load speed) for fast and controlled polishing.
Q: What materials can it be used on?
A: It is designed for natural stone, granite, marble, quartz, porcelain, and engineered stone fabrication and finishing.
Q: Is it suitable for wet polishing?
A: Yes, it includes a central water-feed system that ensures consistent water flow for wet polishing applications and dust control.
Q: What makes this polisher professional-grade?
A: It features high air efficiency, precision quarter-turn controls, a spindle lock for fast tool changes, and a durable industrial build for job-site use.
Q: What is included with the tool?
A: It typically comes with a 30-ft twin air/water hose, quick-connect valve, exhaust hose, rust inhibitor oil, and a carrying toolbox.
Q: Is it heavy or easy to handle?
A: It is lightweight (about 3 lbs tool body), designed for better maneuverability and reduced operator fatigue.
Q: What is it mainly used for?
A: It is used for edge polishing, profiling, shaping, beveling, and finishing stone surfaces on countertops and slabs.
Maintenance Tips
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Flush water system after every use: Prevent slurry buildup and internal clogging
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Lubricate air inlet regularly: Keeps pneumatic motor running smoothly
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Inspect hoses for cracks/leaks: Ensures stable air + water flow
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Clean spindle and attachments: Prevents dust affecting accessory fit
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Check air pressure (90 PSI): Incorrect pressure reduces performance or damages motor
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Store dry in case: Protects from corrosion and internal rust
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Keep exhaust port clean: Maintains cooling efficiency during long polishing sessions
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Replace worn seals/O-rings: Prevents air loss and performance drop
Damage 
Loss 
Theft 
