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 FINE
3(.099)-56
4(.112)-48
6(.138)-40
8(.164)-36
10(.190)-32

1/4(.2500)-28
5/6(.3125)-24
3/8(.3750)-24
7/16(.4375)-20
1/2(.5000)-20

9/16(.5625)-18
5/8(.6250)-18
3/4(.7500)-16
7/8(.8750)-14
1(.10000)-14*
1(.10000)-12

1-1/8(1.1250)-12
1-1/4(1.2500)-12
1-3/8(1.3750)-12
1-1/2(1.5000)-12		 1191
1191
1191
1191
1191

1191
1191
1191
1191
1191

1191
1191
1191
1191
1191
1191

1191
1191
1191
1191		 3591
3591
3591
3591
3591

3591
3591
3591
3591
3591

3591
3591
3591
3591
3591
3591

3591
3591
3591
3591		 03CN
04CN
06CN
2CN
3CN

4CN
5CN
6CN
7CN
8CN

9CN
10CN
12CN
14CN
16CN
161CN

18CN
20CN
22CN
24CN		 0.099
0.112
0.138
0.164
0.190

0.250
0.312
0.375
0.438
0.500

0.562
0.625
0.750
0.875
1.000
1.000

1.125
1.250
1.375
1.500		 0.148
0.168
0.207
0.246
0.285

0.375
0.469
0.562
0.656
0.750

0.844
0.938
1.125
1.312
1.500
1.500

1.688
1.875
2.062
2.250		 0.198
0.224
0.276
0.328
0.380

0.500
0.625
0.750
0.875
1.000

1.125
1.250
1.500
1.750
2.000
2.000

2.250
2.500
2.750
3.000		 0.248
0.280
0.345
0.410
0.475

0.625
0.781
0.938
1.094
1.250

1.406
1.562
1.875
2.188
2.500
2.500

2.812
3.125
3.438
3.750		 0.297
0.336
0.414
0.492
0.570

0.750
0.938
1.125
1.312
1.500

1.688
1.875
2.250
2.625
3.000
3.000

3.375
3.750
4.125
4.500		 .131     .146
.147     .162
.173     .193
.204     .224
.236     .256

.306     .326
.380     .400
.448     .468
.524     .549
.592     .617

.666     .691
.733     .758
.876     .901
1.021    1.051
1.156    1.186
1.169    1.199

1.304    1.334
1.439    1.469
1.575    1.610
1.710    1.745
Sample Insert Specifications taken from the Heli-Coil© Bulleton 1000.
* Inactive for new design.
© 2007 Airhardware All Rights Reserved