简要说明：外丝:又叫外丝短节或螺纹短节.一般分单头外丝、双头外丝和六角外丝.六角外丝又为同径六角外丝和异径六角外丝.

六角外丝数表    (HEXAGONAL NIPPLE)
公称通径		尺寸
Nominal Diameter		Size
DN	NPS	C	E1	E2	W	D
						sch80	sch160
6	1/8	6	10	---	26	5	4
8	1/4	6	15	---	36	7	6
8×6	1/4×1/8	6	15	10	31	5	4
10	3/8	8	16	---	40	10	8
10×8	3/8×1/4	8	16	15	39	7	6
15	1/2	8	20	---	48	13	10
15×10	1/2×3/8	8	20	16	44	10	8
15×8	1/2×1/4	8	20	15	43	7	6
20	3/4	10	21	---	52	18	14
20×15	3/4×1/2	10	21	20	51	13	10
20×10	3/4×3/8	10	21	16	47	10	8
25	1	10	25	---	60	23	19
25×20	1×3/4	10	25	21	56	18	14
25×15	1×1/2	10	25	20	55	13	10
32	1.1/4	12	25	---	62	31	28
32×25	1.1/4×1	12	25	25	62	23	19
32×20	11/4×3/4	12	25	21	58	18	14
32×15	1.1/4×1/2	12	25	20`	57	13	10
40	1 1/2	16	26	---	68	36	32
40×32	1.1/2×1.1/4	16	26	25	67	31	28
40×25	1.1/2×1	16	26	25	67	23	19
40×20	1.1/2×3/4	16	26	21	63	18	14
40×15	1.1/2×1/2	16	26	20	62	13	10
50	2	18	27	---	72	47	40
50×40	2×1.1/2	18	27	26	71	36	32
50×32	2×1.1/4	18	27	25	70	31	28
50×25	2×1	18	27	25	70	23	19
50×20	2×3/4	18	27	21	66	18	14
50×15	2×1/2	18	27	20	65	13	10
65	2.1/2	20	38	---	96	57	51
65×50	2.1/2×2	20	38	27	85	47	40
65×40	2.1/2×1.1/2	20	38	26	84	36	32
65×32	2.1/2×1.1/4	20	38	25	83	31	28
65×25	2.1/2×1	20	38	25	83	23	19
65×20	2.1/2×3/4	20	38	21	79	18	14
80	3	20	40	---	100	70	63
80×65	3×2.1/2	20	40	38	98	57	51
80×50	3×2	20	40	27	87	47	40
80×40	3×1.1/2	20	40	26	86	36	32
80×32	3×1.1/4	20	40	25	85	31	28
80×25	3×1	20	40	25	85	23	19
注：螺纹型式为GB/T 12716 ( ANSI / ASME B1.20.1 ) 中的60°圆锥管螺纹NPT；也可采用其它型式的螺纹制造，请在订货时注明。