Minimum Nozzle Size Chart For Sandblasting Abrasives

How to Select the Correct Sandblasting Nozzle Size

Choosing the correct sandblasting nozzle bore size is important for maintaining consistent abrasive flow, preventing clogging, and achieving efficient blasting performance.

Abrasive particle size is one of the primary factors determining the minimum nozzle opening.  Generally, a nozzle bore should be at least 3–4 times the diameter of the largest abrasive particles being used.  However, actual minimum nozzle recommendations can vary depending on the abrasive material and its particle-size distribution.

Important Factors When Selecting a Nozzle

  • Abrasive grit size: Coarser abrasive particles generally require larger nozzle openings.
  • Abrasive material: Coal slag, crushed glass, aluminum oxide, silicon carbide, and garnet may have different recommended minimum nozzle sizes even when their nominal mesh ranges appear similar.
  • Air compressor capacity: Larger nozzles require substantially more compressed air to maintain blasting pressure.  You also need to make sure test psi at the nozzle, NOT your compressor.
  • Abrasive flow: Using a nozzle that is too small can contribute to clogging and inconsistent media flow.
  • Nozzle wear: Nozzle openings gradually enlarge during use, increasing compressed-air consumption.
  • Equipment type: Pressure blasting systems and suction blasting cabinets can have different nozzle and abrasive flow requirements.

Minimum Nozzle Size vs. Recommended Operating Size

The minimum nozzle bore is the smallest opening recommended for a particular abrasive grade.  It does not necessarily represent the most efficient nozzle size for every blasting application.  And keep in mind, a larger nozzle may provide improved abrasive flow and productivity when the compressor and blasting equipment are appropriately matched.  You also need to make sure test psi at the nozzle, NOT your compressor.

Important:  The nozzle sizes shown above are general reference values based on published abrasive manufacturer recommendations.  Always verify nozzle compatibility with the specific abrasive grade, blasting equipment, and manufacturer specifications.

Minimum Nozzle Size Chart for Sandblasting Abrasives

Abrasive Media

Grit / Mesh Size

Suggested Minimum Bore

Nozzle #

Aluminum Oxide (Brown or White)

12

5/16"

#5

Aluminum Oxide (Brown or White)

16–20

1/4"

#4

Aluminum Oxide (Brown or White)

24–36

3/16"

#3

Aluminum Oxide (Brown or White)

46–60

1/8"

#2

Aluminum Oxide (Brown or White)

70–120

1/8"

#2

Aluminum Oxide (Brown or White)

150–220

1/8"

#2

Silicon Carbide (Black or Green)

12

5/16"

#5

Silicon Carbide (Black or Green)

16–20

1/4"

#4

Silicon Carbide (Black or Green)

24–36

3/16"

#3

Silicon Carbide (Black or Green)

46–60

1/8"

#2

Silicon Carbide (Black or Green)

70–120

1/8"

#2

Silicon Carbide (Black or Green)

150–220

1/8"

#2

Coal or Copper Slag

12/40

1/4"

#4

Coal or Copper Slag

20/40

3/16"

#3

Coal or Copper Slag

30/60

1/8"

#2

Coal or Copper Slag

40/80

1/8"

#2

Crushed Glass

12/30

1/4"

#4

Crushed Glass

20/40

1/4"

#4

Crushed Glass

30/70

3/16"

#3

Crushed Glass

70

1/8"

#2

Note: Nozzle sizes are approximate guidelines.  Confirm minimum bore requirements with the specific abrasive manufacturer and blasting equipment specifications.  Coal and copper slag do not necessarily have identical particle-size distributions or minimum nozzle requirements.