Dimensions mm · values as the standard states them Size P d1 b L1 M6 1 5.7 – 6.3
60
120
M8 1.25 7.5 – 8.5
65
120
M10 1.5 7.5 – 8.5
75
150
M12 1.75 9.5 – 10.5
75
150
M16 2 9.5 – 10.5
100
200
M20 2.5 11.5 – 12.5
120
220
M24 3 11.5 – 12.5
150
260
M27 3 11.5 – 12.5
160
260
M30 3.5 15.5 – 16.5
160
260
M36 4 15.5 – 16.5
180
300
M42 4.5 19.5 – 20.5
200
350
M48 5 19.5 – 20.5
220
380
M56 5.5 24.5 – 25.5
230
380
M64 6 24.5 – 25.5
—
425
M72 29.5 – 30.5
270
400
M80 29.5 – 30.5
270
400
Ranges read min – max; ≤ / ≥ where the standard gives one limit, ≈ for approximate values. Sizes in (brackets) are non-preferred. Select a row for its size sheet.
Size sheet · DIN 1478 SE
M6
d1 hole diameter 5.7 – 6.3
b length of thread 60
L1 length 120 Thread · ISO 261/262
Pitch P 1
d2 5.35
d3 4.773
Tap drill 5
Stress area As 20.12 mm² Size sheet · DIN 1478 SE
M8
d1 hole diameter 7.5 – 8.5
b length of thread 65
L1 length 120 Thread · ISO 261/262
Pitch P 1.25
d2 7.188
d3 6.466
Tap drill 6.75
Stress area As 36.61 mm² Size sheet · DIN 1478 SE
M10
d1 hole diameter 7.5 – 8.5
b length of thread 75
L1 length 150 Thread · ISO 261/262
Pitch P 1.5
d2 9.026
d3 8.16
Tap drill 8.5
Stress area As 57.99 mm² Size sheet · DIN 1478 SE
M12
d1 hole diameter 9.5 – 10.5
b length of thread 75
L1 length 150 Thread · ISO 261/262
Pitch P 1.75
d2 10.863
d3 9.853
Tap drill 10.25
Stress area As 84.27 mm² Size sheet · DIN 1478 SE
M16
d1 hole diameter 9.5 – 10.5
b length of thread 100
L1 length 200 Thread · ISO 261/262
Pitch P 2
d2 14.701
d3 13.546
Tap drill 14
Stress area As 156.67 mm² Size sheet · DIN 1478 SE
M20
d1 hole diameter 11.5 – 12.5
b length of thread 120
L1 length 220 Thread · ISO 261/262
Pitch P 2.5
d2 18.376
d3 16.933
Tap drill 17.5
Stress area As 244.79 mm² Size sheet · DIN 1478 SE
M24
d1 hole diameter 11.5 – 12.5
b length of thread 150
L1 length 260 Thread · ISO 261/262
Pitch P 3
d2 22.051
d3 20.319
Tap drill 21
Stress area As 352.5 mm² Size sheet · DIN 1478 SE
M27
d1 hole diameter 11.5 – 12.5
b length of thread 160
L1 length 260 Thread · ISO 261/262
Pitch P 3
d2 25.051
d3 23.319
Tap drill 24
Stress area As 459.41 mm² Size sheet · DIN 1478 SE
M30
d1 hole diameter 15.5 – 16.5
b length of thread 160
L1 length 260 Thread · ISO 261/262
Pitch P 3.5
d2 27.727
d3 25.706
Tap drill 26.5
Stress area As 560.59 mm² Size sheet · DIN 1478 SE
M36
d1 hole diameter 15.5 – 16.5
b length of thread 180
L1 length 300 Thread · ISO 261/262
Pitch P 4
d2 33.402
d3 31.093
Tap drill 32
Stress area As 816.72 mm² Size sheet · DIN 1478 SE
M42
d1 hole diameter 19.5 – 20.5
b length of thread 200
L1 length 350 Thread · ISO 261/262
Pitch P 4.5
d2 39.077
d3 36.479
Tap drill 37.5
Stress area As 1120.91 mm² Size sheet · DIN 1478 SE
M48
d1 hole diameter 19.5 – 20.5
b length of thread 220
L1 length 380 Thread · ISO 261/262
Pitch P 5
d2 44.752
d3 41.866
Tap drill 43
Stress area As 1473.15 mm² Size sheet · DIN 1478 SE
M56
d1 hole diameter 24.5 – 25.5
b length of thread 230
L1 length 380 Thread · ISO 261/262
Pitch P 5.5
d2 52.428
d3 49.252
Tap drill 50.5
Stress area As 2030.02 mm² Size sheet · DIN 1478 SE
M64
d1 hole diameter 24.5 – 25.5
L1 length 425 Thread · ISO 261/262
Pitch P 6
d2 60.103
d3 56.639
Tap drill 58
Stress area As 2675.97 mm² Size sheet · DIN 1478 SE
M72
d1 hole diameter 29.5 – 30.5
b length of thread 270
L1 length 400 Size sheet · DIN 1478 SE
M80
d1 hole diameter 29.5 – 30.5
b length of thread 270
L1 length 400 Provenance
Draft — values taken from a single source and not yet cross-checked.
fasteners.eu dimensions, lengths, materials, property classes, current norm, equivalent norms Accessed 2026-09-23 · For design and safety-critical use, consult the current edition of the standard.
Data notes (1) 1 value(s) omitted after consistency checks: M64 b: value 300 breaks the size progression — omitted as a probable source typo