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Redhorse Performance Thread Size Chart
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| SAE J514 37° Hydraulic Flare Sizes (formerly known as JIC)
The society of Automotive Engineers (SAE) specifies a 37° angle flare or seat be used with high pressure hydraulic tubing. These are commonly called JIC couplings.
The JIC 37° flare male will mate with a JIC female only. The JIC male has straight threads and a 37° flare seat. The JIC female has straight threads and a 37° flare seat. The seal is made on the 37° flare seat.
Some sizes have the same threads as the SAE J512 45° flare. Carefully measure the seat angle to differentiate.
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Dash Size
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Nominal Size
Fraction
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Thread Size
Threads per Inch
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Female Thread
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Male Thread
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Thread I.D.
Fraction
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Thread I.D.
Fraction
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-02
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1/8
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5/16-24
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17/64
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.265625
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5/16
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.3125
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-03
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3/16
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3/8-24
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21/64
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.328125
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3/8
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.375
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-04
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1/4
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7/16-20
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25/64
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.390625
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7/16
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.4375
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-05
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5/16
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1/2-20
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29/64
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.453125
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1/2
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.500
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-06
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3/8
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9/16-18
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1/2
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.500
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9/16
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.5625
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-08
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1/2
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3/4-16
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11/16
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.6875
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3/4
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.750
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-10
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5/8
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7/8-14
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13/16
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.8125
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7/8
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.875
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-12
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3/4
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1 1/16-12
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31/32
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.96875
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1 1/16
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1.0625
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-14
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7/8
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1 3/16-12
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1 7/64
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1.109375
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1 3/16
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1.1875
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-16
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1
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1 5/16-12
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1 15/64
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1.234375
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1 5/16
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1.3125
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-20
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1 1/4
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1 5/8-12
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1 35/64
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1.546875
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1 5/8
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1.625
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-24
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1 1/2
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1 7/8-12
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1 51/64
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1.796875
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1 7/8
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1.875
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-32
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2
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2 1/2-12
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2 27/64
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2.421875
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2 1/2
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2.500
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| Some of the most popular adapter fittings shown in our catalog are AN to NPT adapters. While many variations are offered, column one in the chart shows which AN Dash Size corresponds to each NPT size when inside diameters (flow dimensions) are considered. |
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Dash Size
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Nominal Size
Fraction
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No. Threads per Inch
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Female Thread
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Male Thread
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Thread I.D.
Fraction
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Thread I.D.
Decimal
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Thread O.D.
Fraction
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Thread O.D.
Decimal
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-02
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1/8
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27
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23/64
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.359375
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13/32
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.40625
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-04
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1/4
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18
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15/32
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.46875
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35/64
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.546875
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-06
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3/8
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18
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19/32
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.59375
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43/64
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.671875
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-08
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1/2
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14
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3/4
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.750
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27/32
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.84375
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-12
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3/4
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14
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61/64
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.953125
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1 1/16
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1.0625
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-16
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1
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11 1/2
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1 13/64
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1.203125
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1 5/16
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1.3125
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-20
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1 1/4
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11 1/2
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1 17/32
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1.265625
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1 43/64
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1.671875
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-24
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1 1/2
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11 1/2
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1 25/32
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1.390625
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1 29/32
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1.90625
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-32
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2
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11 1/2
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2 1/4
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2.250
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2 3/8
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2.375
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Fraction-Decimal Conversion Chart
Fraction - Inches - Millimeters
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Fraction
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Decimal
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Millimeters
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Fraction
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Decimal
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Millimeters
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1/64
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.015625
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.3969
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33/64
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.515625
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13.0969
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1/32
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.03125
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.7938
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17/32
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.53125
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13.4938
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3/64
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.046875
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1.1906
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35/64
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.546875
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13.8907
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1/16
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.0625
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1.5875
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9/16
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.5625
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14.2876
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5/64
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.078125
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1.9844
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37/64
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.578125
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14.6844
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3/32
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.09375
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2.3813
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19/32
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.59375
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15.0813
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7/64
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.109375
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2.7781
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39/64
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.609375
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15.4782
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1/8
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.125
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3.1750
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5/8
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.625
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15.8751
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9/64
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.140625
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3.5719
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41/64
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.640625
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16.2719
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5/32
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.15625
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3.9688
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21/32
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.65625
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16.6688
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11/64
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.171875
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4.3656
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43/64
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.671875
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17.0657
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3/16
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.1875
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4.7625
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11/16
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.6875
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17.4626
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13/64
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.203125
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5.1594
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45/64
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.703125
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17.8594
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7/32
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.21875
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5.5536
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23/32
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.71875
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18.2563
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15/64
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.234375
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5.9531
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47/64
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.734375
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18.6532
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1/4
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.250
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6.3500
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3/4
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.750
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19.0501
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17/64
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.265625
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6.7469
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49/64
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.765625
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19.4470
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9/32
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.28125
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7.1438
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25/32
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.78125
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19.8438
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19/64
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.296875
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7.5406
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51/64
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.796875
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20.2407
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5/16
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.3125
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7.9375
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13/16
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.8125
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20.6376
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21/64
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.328125
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8.3344
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53/64
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.828125
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21.0345
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11/32
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.34375
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8.7313
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27/32
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.84375
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21.4313
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23/64
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.359375
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9.1282
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55/64
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.859375
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21.8282
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3/8
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.375
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9.5250
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7/8
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.875
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22.2251
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25/64
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.390625
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9.9219
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57/64
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.890625
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22.6220
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13/32
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.40625
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10.3188
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29/32
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.90625
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23.0188
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27/64
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.421875
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10.7157
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59/64
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.921875
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23.4157
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7/16
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.4375
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11.1125
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15/16
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.9375
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23.8126
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29/64
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.453125
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11.5094
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61/64
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.953125
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24.2095
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15/32
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.46875
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11.9063
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31/32
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.96875
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24.6063
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31/64
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.484375
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12.3032
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63/64
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.984375
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25.0032
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1/2
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.500
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12.7001
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1
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1.000
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25.4001
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