For tile size

Trowel notch shape

Thinset thickness

2″ x 2″ (5 x 5 cm) and smaller

3/16″ x 5/32″ (5 x 5 mm) V-notch

1/9″

2.0 mm

4″ x 4″ (10 x 10 cm) and smaller

1/4″ x 3/16″ (6 x 5 mm) V-notch

1/9″

2.4 mm

8″ x 8″ (20 x 20 cm) and smaller

1/4″ x 1/4″ (6 x 6 mm) square-notch

1/8″

3.5 mm

8″ x 8″ (20 x 20 cm) and smaller

1/4″ x 5/16″ (6 x 8 mm) U-notch

1/7″

4.0 mm

12″ x 12″ (30 x 30 cm) and smaller

1/4″ x 3/8″ (6 x 9.5 mm) square-notch

1/5″

5.0 mm

12″ x 12″ (30 x 30 cm) and smaller

1/4″ x 3/8″ (6 x 9.5 mm) U-notch

1/5″

5.0 mm

12″ x 12″ (30 x 30 cm) and larger

1/2″ x 1/2″ (13 x 13 mm) square-notch

1/4″

7.0 mm

12″ x 12″ (30 x 30 cm) and larger

1/4″ x 1/2″ (6 x 12 mm) U-notch

1/4″

7.0 mm

12″ x 12″ (30 x 30 cm) and larger

3/4″ x 5/8″ (19 x 16 mm) U-notch

1/3″

8.0 mm