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圆螺纹 DIN 20400

They are used in coupling gears and brake rods in railway waggons, valves, slides, fittings and by the fire brigade. The Knuckle Threads are insensitive to dirt and damages.
The flank angle is 30°

Bolt Thread	Bolt Tapping	Pitch	Nut Thread	Nut Tapping
Minor Diameter	Drill Size		Minor Diameter	Drill Size
mm	mm		mm	mm
Rd 10	6.7	3	10.3	7
Rd 12	8.7	3	12.3	9
Rd 14	10.7	3	14.3	11
Rd 16	11.6	4	16.4	12
Rd 18	13.6	4	18.4	14
Rd 20	15.6	4	20.4	16
Rd 22	17.6	4	22.4	18
Rd 25	20.6	4	25.4	21
Rd 28	23.6	4	28.4	24
Rd 32	27.6	4	32.4	28
Rd 36	30.5	5	36.5	31
Rd 40	34.5	5	40.5	35
Rd 42	36.5	5	42.5	37
Rd 45	39.5	5	45.5	40
Rd 48	42.5	5	48.5	43
Rd 50	44.5	5	50.5	45
Rd 53	47.5	5	53.5	48
Rd 56	50.5	5	56.5	51
Rd 60	53.4	6	60.6	54
Rd 63	56.4	6	63.6	57
Rd 67	60.4	6	67.6	61
Rd 70	63.4	6	70.6	64
Rd 75	68.4	6	75.6	69
Rd 80	73.4	6	80.6	74
Rd 85	78.4	6	85.6	79
Rd 90	81.2	8	90.8	82
Rd 95	86.2	8	95.8	87
Rd 100	91.2	8	100.8	92
Rd 106	97.2	8	106.8	98
Rd 112	103.2	8	112.8	104
Rd 118	109.2	8	118.8	110
Rd 125	116.2	8	125.8	117
Rd 123	121	10	133	122
Rd 140	129	10	141	130
Rd 150	139	10	151	140
Rd 160	149	10	161	150
Rd 170	159	10	171	160
Rd 180	166.8	12	181.2	168
Rd 190	176.8	12	191.2	178
Rd 200	186.8	12	201.2	188
Rd 212	189.8	12	213.2	200
Rd 224	210.8	12	225.2	212
Rd 236	218.4	16	237.6	220
Rd 250	232.4	16	251.6	234
Rd 265	247.4	16	266.6	249
Rd 280	262.4	16	281.6	264
Rd 300	282.4	16	301.6	284