www.icscuttingtools.com
Three wire method of checking
pitch diameter of screw threads
M = Measurement over wires
E = Pitch diameter of thread
D = Basic major or outside diameter
W = Wire Diameter
M = E + Const.
E M.Const.
Const. = 3W 86603P (found in chart)
The maximum and minimum pitch diameter
(E) for each class of thread can be found in
machinerys hand book.
511 Main St. • Casco, WI 54205-0125 USA
Phone: 920-837-2526 • Fax: 920-837-2530
CONVERSION CHART FOR
60° METRIC THREADS
PITCH
MM
0.5
0.6
0.7
0.75
0.8
1.0
1.25
1.5
1.75
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
WIRE SIZE
ADD
CONSTANT
MM
INCH
MM
INCH
MM
INCH
4572
018
6138
02417
9386 03695
4572
018
4623
01820
8520 03354
4572
018
3107
01223
7654 03013
4572
018
2349
00925
7221 02843
6096
024
6164
02427
11360 04472
6096
024
3133
01233
9628 03790
7366
029
3154
01242
11273 04438
10160
040
7747
03050
17490 06886
10160
040
3958
01558
15324 06033
11430
045
3979
01567
16969 06681
13970
055
4021
01583
20259 07976
16002
063
2540
01000
22025 08671
20574
081
8678
03416
31411 12367
23368
092
9482
03733
35463 13962
27432
108
14096
05550
43325 17057
27432
108
6519
02566
38995 15352
30480
120
8085
03183
43808 17247
32258
127
5841
02300
41812 17643
ONE INCH EQUALS 25.400 MILLIMETERS
.03937 INCH EQUALS ONE MILLIMETER
THREAD CHART
FOR ALL U.S. 60° THREADS
Select the proper wire size for either the number or threads per
inch (US) or thread pitch (metric).
Measured pitch dia (E) equals measurement over wires (M)
minus decimal in “CONST” column.
NOTE: Basic P.D. equals basic major diameter plus decimal in
“ADD” column minus decimal in “CONST” column.
THREADS WIRE
PER INCH SIZE
48
44
40
36
32
28
27
24
20
18
16
14
13
12
018
018
018
018
024
024
024
029
029
032
040
040
045
055
ADD
CONST
02243
01956
01611
01190
02464
01787
01587
02385
01122
01180
02528
01175
01842
03870
03596
03432
03235
02994
04494
04107
03993
05092
04370
04789
06587
05814
06838
09283
www.icscuttingtools.com • [email protected]
THREADS
PER IN
11
11
10
9
8
7
7
6
5
5
4
4
3
3
1/2
1/2
1/2
1/2
1/2
WIRE
SIZE
ADD
CONST
055
055
055
063
072
081
081
092
108
120
127
143
185
185
03321
02722
01345
02061
02656
04093
02649
02341
04845
05689
04421
05011
12199
04982
09869
08627
07840
09277
10775
12753
11928
13166
16654
18679
18855
21249
30756
26632