Thread Tables

Threads

Our fittings are equipped with the following threads:
Whitworth pipe Threads according to ISO 228, DIN 2999
Coarse Threads according to DIN 405
NPT-Threads according to ASA B2.1
Metric Threads according to DIN 13
Parallel Threads Rp. according to ISO 7/1

Whitworth Pipe Thread according to ISO 228 and DIN 2999
Threads ISO 228	Threads DIN 2999	Nominal- outside rounded in mm	At Bottom- of thread female in mm	Number of turns per inch = 25,4 mm
G1/8”	R1/8”	10	8,566	28
G1/4”	R1/4”	13	11,445	19
G3/8”	R3/8”	17	14,950	19
G1/2”	R1/2”	21	18,631	14
G5/8”	R5/8”	23	20,587	14
G3/4”	R3/4”	26	24,117	14
G7/8”	R7/8”	30	27,877	14
G1”	R1”	33	30,291	11
G11/4”	R11/4”	42	38,952	11
G11/2”	R11/2”	48	44,845	11
G2”	R2”	60	56,656	11
G21/2”	R21/2”	75	72,226	11
G3”	R3”	88	84,926	11
G4”	R4”	113	110,072	11

Round thread DIN 405, also milled thread
Thread in inch	Nominal- outside rounded in mm	At Bottom- of thread female in mm	Number of turns per inch = 25,4 mm
Rd 24x1/8”	24	21,14	8
Rd 32x1/8”	32	29,14	8
Rd 38x1/8”	38	35,14	8
Rd 46x1/6”	46	42,19	6
Rd 55x1/6”	55	51,19	6
Rd 62x1/6”	62	58,19	6
Rd 75x1/6”	75	71,19	6
Rd 90x1/6”	90	86,19	6
Rd 105x1/4”	105	99,28	4
Rd 150x1/4”	150	144,28	4