Helicoil Screw Thread Inserts Logo

G (BSPF)

Insert Size

Drill Size

Screw Thread Insert Length

1D

1.5D

2D

2.5D

3D

1/8-28

25/64

0.125

0.188

0.250

0.313

0.375

1/4-19

17/32

0.250

0.375

0.500

0.625

0.750

3/8-19

43/64

0.375

0.563

0.750

0.938

1.125

1/2-14

27/32

0.500

0.750

1.000

1.250

1.500

5/8-14

59/64

0.625

0.938

1.250

1.563

1.875

3/4-14

1-1/6

0.750

1.125

1.500

1.875

7/8-14

1-13/64

0.875

1.313

1.750

2.625

1-11

1-21/64

1.000

1.500

2.000

1.1/4-11

1-43/64

1.250

1.875

2.500

3.750

1.1/2-11

1-29/32

1.500

2.250

3.000

4.500

BA

Insert Size

Drill Size

Screw Thread Insert Length

1D

1.5D

2D

2.5D

3D

0BA

6.2 mm

0.236

0.354

0.472

0.590

0.708

1BA

5.5 mm

0.209

0.313

0.418

0.522

0.627

2BA

4.9 mm

0.185

0.277

0.370

0.462

0.555

3BA

4.3 mm

0.161

0.241

0.322

0.402

0.483

4BA

3.8 mm

0.142

0.213

0.284

0.355

0.426

5BA

3.3 mm

0.126

0.189

0.252

0.315

0.378

6BA

2.9 mm

0.110

0.165

0.220

0.275

0.330

HeliCoil / ArmaCoil Screw Thread Insert Lengths & Drill Sizes
Bollhoff HeliCoil Germany
Emhart Technologies USA
Armstrong Precision Components UK

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