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Number of teeth specificaiton table

NPT.NPS
NOMINAL SIZE	within( )DIA of the lower hole in inches
NOMINAL SIZE	NPT		NPS
	Occasions using reamer	Occasions not using reamer	NPS
1/16-27	6.10(0.240)	6.25(0.246)	6.35(0.250)
1/8-27	8.33(0.328)	8.43(0.322)	8.74(0.344)
1/4-18	10.72(0.422)	11.13(0.438)	11.13(0.438)
3/8-18	14.27(0.562)	14.27(0.562)	14.68(0.578)
1/2-14	17.48(0.688)	17.86(0.703)	18.26(0.719)
3/4-14	22.63(0.891)	23.01(0.906)	23.42(0.922)
1/11 1/2	28.58(1.125)	28.98(1.141)	29.36(1.156)
1 1/4-11 1/2	37.31(1.469)	37.69(1.484)	38.10(1.500)
1 1/2-11 1/2	43.66(1.719)	44.04(1.734)	44.45(1.750)
2-11 1/2	55.58(2.188)	55.96(2.203)	56.36(2.219)
2 1/2-8	65.89(2.594)	66.68(2.625)	67.46(2.656)

NPTF.NPSF
within( )DIA of the lower hole in inches
NPTF		NPSF
Occasions using reamer	Occasions not using reamer	NPSF
5.94(0.234)	6.25(0.246)	6.35(0.250)
8.33(0.328)	8.61(0.339)	8.74(0.344)
10.72(0.422)	11.13(0.438)	11.28(0.444)
14.27(0.562)	14.68(0.578)	14.68(0.578)
17.48(0.688)	17.86(0.703)	18.26(0.719)
22.63(0.891)	23.42(0.922)	23.42(0.922)
28.58(1.125)	29.36(1.156)	23.96(1.156)
37.31(1.469)	38.10(1.500)
43.26(1.703)	44.04(1.734)
55.58(2.188)	55.36(2.219)
65.89(2.594)	67.68(2.641)

Comparison chart of the DIA of the lower hole of tube screw
NOMINAL SIZE	within( ) DIA of the lower hole in inches
	Standard diameter BASIC DIA		Inner Dia of female thread within (min) effective length	Inner dia of female thread within (min) standard length
	Occasions using reamer	Occasions not using reamer	Inner Dia of female thread within (min) effective length	Inner dia of female thread within (min) standard length
PT 1/16-28	6.10	6.20	6.244	6.384
PT 1/8-28	8.10	8.20	8.249	8.398
PT 1/4-19	10.70	11.00	10.962	11.174
PT 3/8-19	14.2	14.5	14.448	14.658
PT 1/2-14	17.6	18.0	17.979	18.263
PT 3/4-14	23.0	23.5	23.378	23.663
PT 1-11	29.0	29.5	29.459	29.822
PT 1 1/4-11	37.5	38.0	37.976	38.339
PT 1 1/2-11	43.4	44.0	43.689	44.232
PT 2-11	54.9	55.5	55.412	55.844

Hose connector -General name-H and thread comparison chart
Nominal-UNF NOMINAL SIZE	Standard DIA BASIC DIA	Hose connector – general name H
7/16X20	9.8	1/4
1/2X20	11.50	5/16
9/16X18	12.90	3/8
3/4X16	17.50	1/2
7/8X14	20.50	5/8
1 1/16X12	24.90	3/4
1 5/16X12	31.30	1"
1 5/8X12	39.30	1 1/4
1 7/8X12	45.60	1 1/2
2 1/2X12	61.55	2"

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