Japanese Industrial Standard

JIS 30° Flare

Sealing – The male has a 30° nose and a straight thread. The female half has a 30° flare and a straight thread.  This connection is similar to 37° flare.  Its 30° seat and BSPP thread dimensions differentiate it from the 37° flare.  The seal is created by establishing a line of contact between the male nose and the female flare.  The threads hold the connection mechanically.

  

Inch Size	Dash Size	Nominal Thread	Male Thread OD (inch)	Female Thread ID (inch)
1/8	-02	G1/8×28	3/8 (0.38)	11/32 (0.35)
1/4	-04	G1/4×19	33/64 (0.52)	15/32 (0.47)
3/8	-06	G3/8×19	21/32 (0.65)	19/32 (0.60)
1/2	-08	G1/2×14	13/16 (0.82)	3/4 (0.75)
5/8	-10	G5/8×14	7/8 (0.88)	13/16 (0.80)
3/4	-12	G3/4×14	1-1/32 (1.04)	31/32 (0.97)
1	-16	G1x11	1-5/16 (1.30)	1-7/32 (1.22)
1-1/4	-20	G1-1/4×11	1-21/32 (1.65)	1-9/16 (1.56)
1-1/2	-24	G1-1/2×11	1-7/8 (1.88)	1-13/16 (1.79)
2	-32	G2x11	2-11/32 (2.35)	2-1/4 (2.26)

 

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