Outperform and outlast traditional standard pitch models. Bi-metal construction with teeth made from specially hardened type M3 high speed steel. The varying teeth height and gullet sizes result in much faster cutting and longer life. For wood; mild, tool and stainless steels; cast iron; brass and aluminum. 51 sizes from 9/16” (14mm) to 6” (152mm).

Features

  • Depth of cut: 1-1/2 (38 mm)
  • Bi-metal construction
  • M 3 HSS Cutting edge
  • 3/5 TPI Variable pitch
  • Positive tooth rake
  • NOTE: Use RIDGID Thread Cutting Oil on all metal except cast iron.
Catalog Number
Model No.
Size
Steel RPMs
S/Steel RPMs
Cast Iron RPMs
Brass RPMs
Aluminum RPMs
Tap Drill Nominal Pipe Size
Body Drill Nominal Pipe Size
in.
mm
in.
mm
in.
mm
52755
M14
9/16
–
580
300
400
790
900
–
–
–
–
52760
M16
–
–
550
275
365
730
825
–
–
–
–
52765
M17
–
–
500
250
330
665
750
–
–
–
–
52770
M19
–
–
460
230
300
600
690
–
–
3/8
–
52775
M21
13/16
21
390
195
260
520
585
–
–
–
–
52780
M22
–
–
370
185
245
495
555
3/4
–
1/2
–
52785
M24
–
–
350
175
235
470
525
–
–
–
–
52790
M25
–
–
325
160
215
435
480
–
–
–
–
52795
M27
–
–
310
155
210
420
465
–
–
–
–
52800
M29
–
–
300
150
200
400
450
1
–
3/4
–
52805
M30
1 4/43
–
285
145
190
280
425
–
–
–
–
52810
M32
1 1/4
32
275
140
180
360
410
–
–
1 1/4
–
52815
M33
–
–
260
135
175
345
390
–
–
–
–
52820
M35
–
–
250
125
165
330
375
–
–
1
–
52825
M37
–
–
240
120
160
315
360
–
–
–
–
52830
M38
–
–
230
115
150
300
345
1 1/4
–
–
–
52835
M40
–
–
220
110
145
290
330
–
–
–
–
52840
M41
–
–
210
105
140
280
315
–
–
–
–
52845
M43
–
–
205
100
135
270
305
–
–
–
–
52850
M44
1 3/4
–
195
95
130
260
295
1 1/2
–
1 1/4
–
52855
M46
1 13/16
–
190
95
125
250
285
–
–
–
–
52860
M48
1 7/8
–
180
90
120
240
270
–
–
–
–
52865
M51
2
–
170
85
115
230
255
–
–
1 1/2
–
52870
M52
2 1/16
–
165
80
110
220
245
–
–
–
–
52875
M54
2 1/8
–
160
80
105
210
240
–
–
–
–
52880
M57
2 1/4
–
150
75
100
200
225
2
–
–
–
52885
M59
2 5/16
–
145
75
100
195
225
–
–
–
–
52890
M60
2 3/8
–
140
70
95
190
220
–
–
–
–
52895
M64
2 1/2
–
135
65
90
180
205
–
–
2
–
52900
M65
2 9/16
–
130
65
85
175
200
–
–
–
–
52905
M67
2 5/8
–
130
65
85
175
200
–
–
–
–
52910
M70
2 3/4
–
125
60
80
160
185
–
–
–
–
52915
M73
2 7/8
–
120
60
80
160
180
–
–
–
–
52920
M76
3
–
115
55
75
150
170
–
–
2 1/2
–
52925
M79
3 1/8
–
110
55
70
140
165
–
–
–
–
52930
M83
3 1/4
–
105
50
70
140
155
3
–
–
–
52935
M86
3 3/8
–
100
50
70
130
150
–
–
–
–
52940
M89
3 1/2
–
95
45
65
130
145
–
–
–
–
52945
M92
3 5/8
–
95
45
60
120
140
–
–
3
–
52950
M95
3 3/4
–
90
45
60
120
135
3 1/2
–
–
–
52955
M98
3 7/8
–
90
45
60
120
135
–
–
–
–
52960
M102
4
–
85
40
55
110
130
–
–
–
–
52965
M105
4 1/8
–
80
40
55
110
120
–
–
3 1/2
–
52970
M108
4 1/4
–
80
40
50
100
120
–
–
–
–
52975
M110
4 3/8
–
80
40
55
100
120
–
–
–
–
52980
M114
4 1/2
–
75
35
50
100
105
–
–
4
–
52985
M121
4 3/4
–
70
35
45
90
95
–
–
–
–
52990
M127
5
–
65
30
40
85
90
–
–
–
–
52995
M140
5 1/2
–
60
30
35
80
85
–
–
–
–
53000
M152
6
–
55
25
35
75
85
–
–
–
–