Heli-Coil

NOMINAL
THREAD SIZE

TYPE

SIZE DESIG-  NATION

"Q" NOMINAL LENGTH

OUTSIDE
DIAMETER

STANDARD
INSERT NO.

SCREW
LOCK
INSERT NO.

1 Dia.

11/2 Dia.

2 Dia.

21/2 Dia.

3 Dia.

Min.    Max.
UNIFIED COARSE
2(.086)-56
3(.099)-48
4(.112)-40

5(.125)-40
6(.138)-32
8(.164)-32

10(.190)-24
12(.216)-24
1/4(.2500)-20

5/16(.3125)-18
3/8(.3750)-16
7/16(.4375)-14
1/2(.5000)-13

9/16(.5625)-12
5/8(.6250)-11
3/4(.7500)-10
7/8(.8750)-9
1(1.0000)-8

1-1/8(1.1250)-7
1-1/4(1.2500)-7
1-3/8(1.3750)-6
1-1/2(1.5000)-66		 1185
1185
1185

1185
1185
1185

1185
1185
1185

1185
1185
1185
1185

1185
1185
1185
1185
1185

1185
1185
1185
1185		 3585
3585
3585

3585
3585
3585

3585
3585
3585

3585
3585
3585
3585

3585
3585
3585
3585
3585

3585
3585
3585
3585		 02CN
03CN
04CN

05CN
06CN
2CN

3CN
1CN
4CN

5CN
6CN
7CN
8CN

9CN
10CN
12CN
14CN
16CN

18CN
20CN
22CN
24CN6		 0.086
0.099
0.112

0.125
0.138
0.164

0.190
0.216
0.250

0.312
0.375
0.438
0.500

0.562
0.625
0.750
0.875
1.000

1.125
1.250
1.375
1.500		 0.129
0.148
0.168

0.188
0.207
0.246

0.285
0.324
0.375

0.469
0.562
0.656
0.750

0.844
0.938
1.125
1.312
1.500

1.688
1.875
2.062
2.250		 0.172
0.198
0.224

0.250
0.276
0.328

0.380
0.432
0.500

0.625
0.750
0.875
1.000

1.125
1.250
1.500
1.750
2.000

2.250
2.500
2.750
3.000		 0.215
0.248
0.280

0.312
0.345
0.410

0.475
0.540
0.625

0.781
0.938
1.094
1.250

1.406
1.562
1.875
2.188
2.500

2.812
3.1250
3.438
3.750		 0.258
0.297
0.336

0.375
0.414
0.492

0.570
0.648
0.750

0.938
1.125
1.312
1.500

1.688
1.875
2.250
2.625
3.000

3.375
3.750
4.125
4.500		 .110     .119
.128     .139
.144     .159

.158     .173
.178     .193
.205     .220

.244     .259
.270     .285
.310     .330

.380     .400
.452     .472
.526     .551
.597     .622

.699     .694
.742     .767
.881     .906
1.022    1.052
1.166    1.196

1.315    1.355
1.443    1.483
1.598    1.643
1.727    1.772
Sample Insert Specifications taken from the Heli-Coil© Bulleton 1000.
* Inactive for new design.
© 2007 Airhardware All Rights Reserved