How to fit & remove Angle Grinder disc using a pin spanner

Before You Begin 

Important: Always remove the battery or disconnect from mains power before fitting or removing a disc. 

Preparation Steps 

1. Pin Spanner Locking Nut 
These instructions apply to RYOBI Angle Grinders fitted with a pin spanner locking nut, which has four holes around the centre thread for positioning the spanner. 
You’ll need a pin spanner to fit and remove the disc, do not attempt to remove the disc without one, as this can damage the spindle.

If your grinder uses a tool-free locking nut (FixTec), refer to: How to fit & remove a RYOBI Angle Grinder disc using a tool-free locking nut. 

2. Avoid Overtightening 
Over tightening the disc can cause it to jam and may damage your tool. Follow the steps below carefully when fitting the disc. 

3. Check Disc Size 
Ensure the disc is the correct size for your grinder. See: What disc size is suitable for my RYOBI Angle Grinder? 

4. Check Tool and Disc Suitability 
Not all angle grinders are designed for cutting or grinding. Confirm your grinder is suitable for the task by visiting ryobi.com.au and reviewing the product description. 

5. Wear Gloves
Gloves are recommended when handling or gripping the disc. 

Fitting or Refitting a Disc 

1. Turn the tool off and disconnect from power (remove battery or unplug). 

2. Position the disc so it sits flush against the inner flange. 

3. Place the locking nut on the spindle/thread:  

• Grinding discs: Raised hub face down.
• Cut-off discs: Raised hub face up (to prevent slipping).
   

4. Press and hold the spindle lock button (usually located on the top of the grinder) to stop the spindle rotating. 

5. Tighten the nut clockwise by hand until secure. The disc should feel firm with no side-to-side movement. 

6. With the spindle lock still depressed, rotate the disc clockwise no more than a quarter turn to fully secure. Do not overtighten, as this can make removal difficult and damage the tool. 

Note: If you cannot tighten by hand, use the pin spanner for the final adjustment. 

Removing a Disc Using a Pin Spanner 

1. Ensure the tool is switched off and disconnected from power.

2. Position the grinder so the locking nut and disc are accessible.

3. Insert the pin spanner into two opposite holes on the locking nut. Depress the spindle lock button until the disc and nut stop moving.

4. While holding the spindle lock button, turn the nut anti-clockwise with the pin spanner and remove it to access the disc.