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SAE Thread O ring pilot size chart

Date:Apr 02, 2020

O-Ring Pilot Threads

This connection is widely found in automotive and commercial air conditioning applications. Both male and female halves have a pilot (could be long or short), and the seal is made when the O-ring is compressed. Threads tightly mesh together to form a strong mechanical bond.

  

Inch size

Dash size

Male Thread

Female thread

Thread size

Thread O.D.

Thread size

Thread I.D.

3⁄8

-6

5⁄8 - 18

5⁄8

5⁄8 - 18

9⁄16

1⁄2

-8

3⁄4 - 18

3⁄4

3⁄4 - 16

11⁄16

5⁄8

-10

7⁄8 - 18

7⁄8

7⁄8 - 14

13⁄16

3⁄4

-12

1 1⁄16 - 16

1 1⁄16

1 1⁄16 - 14

1

 

Inch size

Dash size

Long pilot

Short pilot

Bead O.D. (in)

Pilot Length (in)

Bead O.D. (in)

Pilot Length (in)

3⁄8

-6

0.52

0.28

0.52

0.19

1⁄2

-8

0.64

0.39

0.64

0.19

5⁄8

-10

0.77

0.39

0.77

0.19

3⁄4

-12

0.91

0.39

0.91

0.19


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