Trapezoidal Threads

Trapezoidal Screw Threads

Relevant Standards

BS 5346:1976 Specification for ISO metric trapezoidal screw threads
ISO 2901:1977 ISO metric trapezoidal screw threads -- Basic profile and maximum material profiles
ISO 2902:1977 ISO metric trapezoidal screw threads -- General plan
ISO 2903:1977 ISO metric trapezoidal screw threads -- Tolerances
ISO 2904:1977 ISO metric trapezoidal screw threads -- Basic dimensions
Din 103-4 ISO Metric Trapezoidal Screw Thread; Nominal Dimensions

Trapezoidal Thread form to ISO 2904 ........Table of Threads to DIN 103-4

Thread Proportions

H₁ = 0,5p	H₄ = H₁ + a_c	h₃ = H₁ + a_c
D₄ = d + 2a_c	Z = H₁ /2	D₁ = d - 2H₁ = d - p
d₃ = D - 2h₃	d₂ = D₂= d - 2Z = d - 0,5p	R_1max= 0,5 a_c R_2max= a_c

a_c = ( D₄ - d ) /2

Table of trapezoidal screw threads are in accordance with ISO 2904:1977

All dimensions in milli metres

d	P	d₂ =D₂	D₄	d₃	D¹	d	P	d₂ =D₂	D₄	d₃	D₁
mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm
8	1,5	7,250	8,300	6,200	6,500	42	3	40,500	42,500	38,500	39,000
9	1,5	8,250	9,300	7,200	7,500	42	7	38,500	43,000	34,000	35,000
9	2	8,000	9,500	9.250	7,000	42	10	37,000	43,000	41,000	32,000
10	1,5	9,250	11,000	2,000	3,000	44	3	42,500	44,500	40,500	41,000
10	2	9,000	10,500	7,500	8,000	44	7	40,500	45,000	36,000	37,000
11	2	10,000	11,500	8,500	9,000	44	12	38,000	45,000	31,000	32,000
11	3	9,500	11,500	7,500	8,000	46	3	44,500	46,500	42,500	43,000
12	2	11,000	12,500	9,500	10,000	46	8	42,000	47,000	37,000	38,000
12	3	10,500	12,500	8,500	9,000	46	12	40,000	47,000	33,000	34,000
14	2	13,000	14,500	11,500	12,000	48	3	46,500	48,500	44,500	45,000
14	3	12,500	14,500	10,500	11,000	48	8	44,000	49,000	39,000	40,000
16	2	15,000	16,500	13,500	14,000	48	12	42,000	49,000	35,000	36,000
16	3	14,500	16,500	12,500	13,000	50	3	48,500	50,500	46,500	47,000
18	2	17,000	18,500	15,500	16,000	50	8	46,000	51,000	41,000	42,000
18	4	16,000	18,500	13,500	14,000	50	12	44,000	51,000	37,000	38,000
20	2	19,000	20,500	17,500	18,000	52	3	50,500	52,500	48,500	49,000
20	4	18,000	20,500	15,500	16,000	52	8	48,000	53,000	43,000	44,000
22	3	20,500	22,500	18,500	19,000	52	12	46,000	53,000	39,000	40,000
22	5	19,500	22,500	16,500	17,000	55	3	53,500	55,500	51,500	52,000
22	8	18,000	23,000	13,000	14,000	55	9	50,500	56,000	45,000	46,000
24	3	22,500	24,500	20,500	21,000	55	14	48,000	57,000	39,000	41,000
24	5	21,500	24,500	18,500	19,000	60	3	58,500	60,500	56,500	57,000
24	8	20,000	25,000	15,000	16,000	60	9	55,500	61,000	50,000	51,000
26	3	24,500	26,500	22,500	23,000	60	14	53,000	62,000	44,000	46,000
26	5	23,500	26,500	20,500	21,000	65	4	63,000	65,500	60,500	61,000
26	8	22,000	27,000	17,000	18,000	65	10	60,000	66,000	54,000	55,000
28	3	26,500	28,500	24,500	25,000	65	16	57,000	67,000	47,000	49,000
28	5	25,500	28,500	22,500	23,000	70	4	68,000	70,500	65,500	66,000
28	8	24,000	29,000	19,000	20,000	70	10	65,000	71,000	59,000	60,000
30	3	28,500	30,500	26,500	27,000	70	16	62,000	72,000	52,000	54,000
30	6	27,000	30,500	23,000	24,000	75	4	73,000	75,500	70,500	71,000
30	10	25,000	31,000	19,000	20,000	75	10	70,000	76,000	64,000	65,000
32	3	30,500	32,500	28,500	29,000	75	16	67,000	77,000	57,000	59,000
32	6	29,000	32,500	25,000	26,000	80	4	78,000	80,500	75,500	76,000
32	10	27,000	33,000	21,000	22,000	80	10	75,000	81,000	69,000	70,000
34	3	32,500	34,500	30,500	31,000	80	16	72,000	82,000	62,000	64,000
34	6	31,000	34,500	27,000	28,000	85	4	83,000	85,500	80,500	81,000
34	10	29,000	35,000	23,000	24,000	85	12	79,000	86,000	72,000	73,000
36	3	34,500	36,500	32,500	33,000	85	18	76,000	87,000	65,000	67,000
36	6	33,000	36,500	29,000	30,000	95	4	93,000	95,500	90,500	91,000
36	10	31,000	37,000	25,000	26,000	95	12	89,000	96,000	82,000	83,000
38	3	36,500	38,500	34,500	35,000	95	18	86,000	97,000	75,000	77,000
38	7	34,500	39,000	30,000	31,000	100	4	98,000	100,500	95,500	96,000
38	10	33,000	39,000	27,000	28,000	100	12	94,000	101,000	87,000	88,000
40	3	38,500	40,500	36,500	37,000	100	20	90,000	102,000	78,000	80,000
40	7	36,500	41,000	32,000	33,000
40	10	35,000	41,000	29,000	30,000

Trapezoidal Thread form to Din 103-4

Table of trapezoidal thread dimensions to DIN 103-4

D_s	P	E	h_e	a	b	K_s	h_s	D_n	K_n	h_n
mm
10	3	8,5	1,25	0,25	0,5	6,5	1,75	10,5	7,5	1,5
12	3	10,5	1,25	0,25	0,5	8,5	1,75	12,5	9,5	1,5
14	4	12	1,75	0,25	0,5	9,5	2,25	14,5	10,5	2
16	4	14	1,75	0,25	0,5	11,5	2,25	16,5	12,5	2
18	4	16	1,75	0,25	0,5	13,5	2,25	18,5	14,5	2
20	4	18	1,75	0,25	0,5	15,5	2,25	20,5	16,5	2
22	5	19,5	2	0,25	0,75	16,5	2,25	22,5	18	2
24	5	21,5	2	0,25	0,75	18,5	2,25	24,5	20	2,25
26	5	23,5	2	0,25	0,75	20,5	2,25	26,5	22	2,25
28	5	25,5	2	0,25	0,75	22,5	2,25	28,5	24	2,25
30	6	27	2,5	0,25	0,75	23,5	3,25	30,5	25	2,75
32	6	29	2,5	0,25	0,75	25,5	3,25	32,5	27	2,75
36	6	33	2,5	0,25	0,75	29,5	3,25	36,5	31	2,75
40	7	36,5	3	0,25	0,75	32,5	3,75	40,5	34	3,25
44	7	40,5	3	0,25	0,75	36,5	3,75	44,5	38	3,25
48	8	44	3,5	0,25	0,75	39,5	4,25	48,5	41	3,75
50	8	46	3,5	0,25	0,75	41,5	4,25	50,5	43	3,75
52	8	48	3,5	0,25	0,75	43,5	4,25	52,5	45	3,75
55	9	50,5	4	0,25	0,75	45,5	4,75	55,5	47	4,25
60	9	55,5	4	0,25	0,75	50,5	4,75	60,5	52	4,25
65	10	60	4,5	0,25	0,75	54,5	5,25	65,5	56	4,75
70	10	65	4,5	0,25	0,75	59,5	5,25	70,5	61	4,75
75	10	70	4,5	0,25	0,75	64,5	5,25	75,5	66	4,75
80	10	75	4,5	0,25	0,75	69,5	5,25	80,5	71	4,75
85	12	79	5,5	0,25	0,75	72,5	6,25	85,5	74	5,75
90	12	84	5,5	0,25	0,75	77,5	6,25	90,5	79	5,75
95	12	89	5,5	0,25	0,75	82,5	6,25	95,5	84	5,75
100	12	94	5,5	0,25	0,75	87,5	6,25	100,5	89	5,75

Useful Links

roton..Information on Trapezoidal Lead screws
getotec..Manufacturers technical brochure

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Trapezoidal Screw Threads