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Bit

Diameter

Thread

Connection

Nozzle Size Nozzle Selection

Air Pressure drop across Blast-hole Bits with various nozzle sizes

Air volume delivered - CFM (cubic feet per minute)

500 600 700 800 900 1000 1100 1200 1300
5” - 6”

2 7/8”

&

3 1/2”

8mm 62 77
10mm 47 59 71
11mm 35 45 55 66 75
12.7mm 26 34 42 50 58 66 74
14mm 18 24 31 38 44 58 58 64 71

6 1/4”

to

7 3/8”

3 1/2” 8mm 52 62 72 81
10mm 43 51 61 69 78
11mm 34 41 48 57 65 73 79
12.7mm 29 33 41 48 54 61 67 73 79
14mm 23 29 34 41 47 51 56 62 67

7 7/8”

to

9”

4 1/2” 10mm 35 44 54 65 74 82
11mm 29 36 43 50 56 64 70 76 82
12.7mm 22 26 32 38 44 50 58 66 75
14mm 21 27 33 38 44 50 56 62
16mm 20 25 30 35 41 46 51
17.5mm 22 26 30 35 40 45
19mm 20 24 28 33 36

9 7/8”

to

11”

6 5/8” 10mm 35 45 53 61 69 76
11mm 28 36 43 51 59 66 73 80
12.7mm 20 26 32 38 44 52 59 65 70
14mm 21 27 33 39 44 50 55 59
16mm 18 24 31 35 40 47 48
17.5mm 21 25 30 35 38 44
19mm 18 21 25 32 35
22mm 21 23 27
25mm

12 1/4”

to

15”

6 5/8” 10mm 18 24 29 34 40 45 52 57
11mm 19 24 28 34 39 44 48
12.7mm 20 22 26 30 33 37
14mm 20 23 26 28 32
16mm 19 22 25
17.5mm 20 23
19mm 16
22mm
25mm

Nozzle Selection

Air Pressure drop across Blast-hole Bits with various nozzle sizes

Air volume delivered - CFM (cubic feet per minute)

1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2600 2800 3000
73 79
83
68 74 81
56 64 68 72 78
51 56 61 66 72 78
40 46 50 54 59 64 69 74 78
76
65 67 74 79
52 59 61 65 69 73 77
48 50 55 59 63 67 71 75 79
39 44 46 49 53 56 60 63 67 72 74 78
31 31 36 39 42 45 47 50 53 54 60 64 70 76
20 22 22 24 27 29 32 34 37 39 41 46 51 56
62 68 74
53 57 61 66 71 76
41 45 49 54 58 62 66 71
35 39 43 47 50 54 58 62 65 69 73
28 31 34 38 41 44 47 51 54 57 61 65 69
26 29 32 35 38 41 43 46 49 52 54 58 52 66
18 20 22 24 26 27 29 32 34 36 39 41 43 46
18 20 22 24 26 28 30 34 38 42
16 18 20 24 26 28 30

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