EPCO: SAE Port Specifications

Provided for reference purposes only. Accepted, published, industry-standard tables take precedence over the data presented herein.

Reference Dimensions
(9/16/09)

R e f e r e n c e	Nominal Tubing OD in		Millimetre		Thread Size SAE J475 (ISO R725), in	D Min Dia		J Full Thread Depth, Min
R e f e r e n c e	Nominal	Decimal	mm	Decimal in Equiv.	Thread Size SAE J475 (ISO R725), in	in	mm	in	mm
A	1/8	0.125	--	--	5/16-24UNF-2B	0.062	1.6	0.390	10.0
B	3/16	0.1875	4	0.1575	3/8-24UNF-2B	0.125	3.2	0.390	10.0
			5	0.1968
C	1/4	0.250	6	0.2362	7/16-2OUNF-2B	0.172	4.4	0.454	11.5
D	5/16	0.3125	8	0.3150	1/2-2OUNF-2B	0.234	6.0	0.454	11.5
E	3/8	0.375	10	0.3937	9/16-18UNF-2B	0.297	7.5	0.500	12.7
F	1/2	0.500	12	0.4724	3/4-16UNF-2B	0.391	10.0	0.562	14.3
G	5/8	0.625	16	0.6299	7/8-14UNF-2B	0.484	12.5	0.656	16.7
H	3/4	0.750			1-1/16-12UN-2B	0.609	16.0	0.750	19.0
I	7/8	0.875	20	0.7874	1-3/16-12UN-2B	0.719	18.0	0.750	19.0
J	1	1.000	25	0.9842	1-5/16-12UN-2B	0.844	21.0	0.750	19.0
K	1-1/4	1.250	32	1.2598	1-5/8-12UN-2B	1.078	27.0	0.750	19.0
L	1-1/2	1.500	40	1.5748	1-7/8-12UN-2B	1.312	33.0	0.750	19.0
M	2	2.000	50	1.9685	2-1/2-12UN-2B	1.781	45.0	0.750	19.0

Notes:

Diameter U shall be concentric with thread pitch diameter within 0.005 in (0.13 mm) FIM, and shall be free from longitudinal and spiral tool marks. Annular tool marks up to marks up to 100 µin (2.5 µm max shall be permissible).
Maximum recommended spotface depth to permit sufficient wrench grip for proper tightening of the fitting or locknut.
If face of boss is on a machined surface, dimensions Y and S need not apply.
Tap drill depths given require use of bottoming taps to produce the specified full thread lengths. Where standard taps are used, the tap drill depths must be increased accordingly.
Nominal tubing OD is shown for the standard in sizes and the conversion to equivalent millimeter sizes. Figures are for reference only, as any boss can be used for a tubing size depending upon other design criteria.