Dimensions Of 'G' Threads (BSPP) Pipe Threads
Size	External Threads							Internal Threads
	Major Ø		Pitch Ø		Pitch Ø		Minor Ø	Minor Ø		Pitch Ø		Major Ø
			Class 'A'		Class 'B'
	Max.	Min.	Max.	Min.	Max.	Min	Max.	Min.	Max.	Min.	Max.	Min.
G 1/16	7.723	7.509	7.142	7.035	7.142	6.928	6.561	6.561	6.843	7.142	7.249	7.723
G 1/8	9.728	9.514	9.147	9.04	9.147	8.933	8.566	8.566	8.848	9.147	9.254	9.728
G 1/4	13.157	12.907	12.301	12.176	12.301	12.051	11.445	11.445	11.89	12.301	12.426	13.157
G 3/8	16.662	16.412	15.806	15.681	15.806	15.556	14.95	14.95	15.395	15.806	15.931	16.662
G 1/2	20.955	20.671	19.793	19.651	19.793	19.509	18.631	18.631	19.172	19.793	19.935	20.955
G 5/8	22.911	22.627	21.749	21.607	21.749	21.465	20.587	20.587	21.128	21.749	21.891	22.911
G 3/4	26.441	26.157	25.279	25.137	25.279	24.995	24.117	24.117	24.658	25.279	25.421	26.441
G 7/8	30.201	29.917	29.039	28.897	29.039	28.755	27.877	27.877	28.418	29.039	29.181	30.201
G 1	33.249	32.889	31.77	31.59	31.77	31.41	30.291	30.291	30.931	31.77	31.95	33.249
G 1.1/8	37.897	37.537	36.418	36.238	36.418	36.058	34.939	34.939	35.579	36.418	36.598	37.897
G 1.1/4	41.91	41.55	40.431	40.251	40.431	40.071	38.952	38.952	39.592	40.431	40.611	41.91
G 1.1/2	47.803	47.443	46.324	46.144	46.324	45.964	44.845	44.845	45.485	46.324	46.504	47.803
G 1.3/4	53.746	53.386	52.267	52.087	52.267	51.907	50.788	50.788	51.428	52.267	52.447	53.746
G 2	59.614	59.254	58.135	57.955	58.135	57.775	56.656	56.656	57.296	58.135	58.315	59.614
G 2.1/4	65.71	65.276	64.231	64.014	64.231	63.797	62.752	62.752	63.392	64.231	64.448	65.71
G 2.1/2	75.184	74.75	73.705	73.488	73.705	73.271	72.226	72.226	72.866	73.705	73.922	75.184
G 2.3/4	81.534	81.1	80.055	79.838	80.055	79.621	78.576	78.576	79.216	80.055	80.272	81.534
G 3	87.884	87.45	86.405	86.188	86.405	85.971	84.926	84.926	85.566	86.405	86.622	87.884
G 3.1/2	100.33	99.896	98.851	98.634	98.851	98.417	97.372	97.372	98.012	98.851	99.068	100.33
G 4	113.03	112.596	111.551	111.334	111.551	111.117	110.072	110.072	110.712	111.551	111.768	113.03
G 4.1/2	125.73	125.296	124.251	124.034	124.251	123.817	122.772	122.772	123.412	124.251	124.468	125.73
G 5	138.43	137.996	136.951	136.734	136.951	136.517	135.472	135.472	136.112	136.951	137.168	138.43
G 5.1/2	151.13	150.696	149.651	149.434	149.651	149.217	148.172	148.172	148.812	149.651	149.868	151.13
G 6	163.83	163.396	162.351	162.134	162.351	161.917	160.872	160.872	161.512	162.351	162.568	163.83