The SAE male has straight threads and a
45 degree flare seat. The SAE female has straight threads and a 45
degree flare seat. The seal is made on the 45 degree flare seat.
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SAE 45 Flare Male |
SAE 45 Flare Female |
1) With a caliper, measure the thread diameter at the widest point
across the threads (See image below).
Outside diameter (O.D.) of male threads. |
Inside diameter (I.D.) of female threads. |
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2) Compare measurements to chart below. For example, a 3/8” male flare has an actual outside diameter of 5/8”.
Nominal
Size
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Female
Thread
I.D.
(In.) |
Male
Thread
O.D. (In.) |
No. of
Threads
Per Inch |
Steel
Torque
Recommended
(Ft-Lbs.) |
1/8 |
17/64 |
5/16 |
24 |
- |
3/16 |
21/64 |
3/8 |
24 |
- |
1/4 |
25/64 |
7/16 |
20 |
10 - 11 |
5/16 |
29/64 |
1/2 |
20 |
13 - 15 |
3/8 |
9/16 |
5/8 |
18 |
17 - 19 |
7/16 |
5/8 |
11/16 |
16 |
- |
1/2 |
11/16 |
3/4 |
16 |
34 - 38 |
5/8 |
13/16 |
7/8 |
14 |
50 - 56 |
3/4 |
63/64 |
1 1/16 |
14 |
70 - 78 |
1 |
1 13/64 |
1 5/16 |
11 1/2 |
65 |
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