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(Non-preferred) dimensions in parentheses.

Same specifications, different dimensions for other parts.

Wire Thread Inserts for ISO Metric Screw Threads - Part 1: Dimensions, Technical Specifications

DIN 8140 (-1) - 1999

Display drawing:

Screw Thread
d

M2.5

(M3.5)

(M7)

M10

M12

P	Coarse thread pitch
	Fine thread pitch
L ^②	Nominal Size （min）
	Nominal Size （max）
n ^③	Number of turns （min.）
	Number of turns （max.）
d₁	Large diameter (min)
	large diameter (max)
core hole, Ref.

0.4	0.45	0.5	0.6	0.7	0.8	1	1	1.25	-	1.5	-	-	1.75	-	-
-	-	-	-	-	-	-	-	-	1	-	1	1.25	-	1	1.25
2	2.5	3	3.5	4	5	6	7	8	8	10	10	10	12	12	12
5	6.25	7.5	8.75	10	12.5	15	17.5	20	20	25	25	20	30	24	24
2.9	3.5	3.9	3.7	3.7	4.3	4.2	5.3	4.7	6.1	5	7.6	6	5.2	9.3	7.4
8.9	10.5	11.1	11.2	10.9	12.3	12.3	14.3	13.5	16.5	14.2	20.7	13.1	14.7	19.5	15.9
2.6	3.3	3.8	4.55	5.15	6.35	7.6	8.65	9.85	9.85	12.1	12.1	12.1	14.4	14.4	14.4
2.8	3.5	4	4.75	5.35	6.6	7.85	8.9	10.1	10.1	12.5	12.5	12.5	14.8	14.8	14.8
2.1	2.6	3.2	3.7	4.2	5.2	6.3	7.3	8.4	8.3	10.5	10.3	10.4	12.5	12.3	12.4

Screw Thread
d

M12

(M14)

(M14) ^①

(M14)

M16

(M18)

(M18) ^①

(M18)

M20

(M22)

P	Coarse thread pitch
	Fine thread pitch
L ^②	Nominal Size （min）
	Nominal Size （max）
n ^③	Number of turns （min.）
	Number of turns （max.）
d₁	Large diameter (min)
	large diameter (max)
core hole, Ref.

-	2	-	-	2	-	2.5	-	-	-	2.5	-	-	2.5	-	-
1.5	-	1.25	1.5	-	1.5	-	1.5	1.5	2	-	1.5	2	-	1.5	2
12	14	14.4	14	16	16	18	-	18	18	20	20	20	22	22	22
30	35	16.4	35	40	40	45	12	45	45	40	40	40	44	33	44
6.2	5.6	9.4	7.4	6.5	8.7	5.6	-	9.5	7.1	6.3	10.7	8	6.9	11.7	8.7
15.7	15.2	10.6	19.9	17.5	22.9	15.5	6	25.3	19.1	13.7	22.4	16.8	15	18.1	18.4
14.4	16.8	16.8	16.8	19	19	21.5	21.5	21.5	21.5	23.7	23.7	23.7	26.3	26.3	26.3
14.8	17.2	17.2	17.2	19.4	19.4	22	22	22	22	24.2	24.2	24.2	26.8	26.8	26.8
12.5	14.5	14.25	14.5	16.5	16.5	18.75	18.5	18.5	18.5	20.75	20.5	20.5	22.75	22.5	22.5

Screw Thread
d

M24

(M27)

M30

(M33)

M36

(M39)

P	Coarse thread pitch
	Fine thread pitch
L ^②	Nominal Size （min）
	Nominal Size （max）
n ^③	Number of turns （min.）
	Number of turns （max.）
d₁	Large diameter (min)
	large diameter (max)
core hole, Ref.

3	-	-	3	3.5	-	-	3.5	-	4	-	-	4	-	-
-	1.5	2	-	-	1.5	2	-	2	-	2	3	-	2	3
24	24	24	27	30	30	30	33	33	36	36	36	39	39	39
48	36	48	54	60	45	45	66	49.5	72	54	54	78	58.5	58.5
6.2	12.9	9.6	7.1	7	16.5	12.3	7.8	13.7	7	14.1	9.9	7.7	16.3	10.8
14	19.8	20.2	15.4	14.9	25.3	19	16.5	21.2	15.2	21.9	15.3	16.6	25	16.8
28.6	28.6	28.6	32.2	35.2	35.2	35.2	38.3	38.3	42.1	42.1	42.1	45.1	45.1	45.1
29.1	29.1	29.1	32.7	35.7	35.7	35.7	38.8	38.8	42.6	42.6	42.6	45.6	45.6	45.6
24.75	24.5	24.5	27.75	31	30.5	30.5	34	33.5	37	36.5	37	40	39.5	40

①,Thread for spark plugs
②,L range of values: M2~M39.
③,The number of turns can be reduced by 0.25

Alternative history

DIN 8140-1 - 1999 DIN 8140-1 - 2022

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