METRICfine60° flank

M8 × 1 fine Thread Dimensions

M8 x 1 (fine) is a fine pitch METRIC thread. Pitch is 1 mm, equivalent to 25.4 threads per inch. The recommended tap drill leaves roughly 75% thread engagement.

Nominal Ø8 mm
Pitch1 mm
Threads per inch25.4
Pitch Ø7.35 mm
Tap drill7 mm

Thread profile

millimetres unless stated
Thread profile — M8 x 1 (fine)d 8d2 7.35d3 6.77mm60°P 1h3 0.61tap ⌀7
M8 × 1 fine — basic profile60° flank angle · Not to scale
Designation
M8 x 1 (fine)
Thread system
METRIC
Series
fine
Flank angle
60°
Major diameter
8 mm / 0.31"
Pitch
1 mm
Threads per inch
25.4
Pitch diameter
7.35 mm
Minor diameter (external)
6.77 mm
Minor diameter (internal)
6.92 mm
Thread depth
0.61 mm
Recommended tap drill
Ø 7 mm / 0.28"

How these values are derived

Basic ISO thread geometry uses the fundamental triangle height H = 0.866025 × P. External minor diameter d₃ = d − 1.226869 × P, internal minor diameter D₁ = d − 1.082532 × P. Tap drill is given as nominal diameter minus pitch, which approximates a 75% thread engagement — adjust for tough materials or deep holes.

Fasteners using this thread194 specification pages

All M8 fasteners
DIN 912ISO 4762DIN 7991ISO 10642ISO 7380DIN 7984DIN 933ISO 4017DIN 931ISO 4014DIN 916DIN 914DIN 915DIN 913ISO 4029DIN 84ISO 1207DIN 85ISO 1580DIN 963ISO 2009
SpecificationLength (mm)
DIN 912 M8 × 12 Hexagon Socket Head Cap Screw12
DIN 912 M8 × 16 Hexagon Socket Head Cap Screw16
DIN 912 M8 × 20 Hexagon Socket Head Cap Screw20
DIN 912 M8 × 25 Hexagon Socket Head Cap Screw25
DIN 912 M8 × 30 Hexagon Socket Head Cap Screw30
DIN 912 M8 × 35 Hexagon Socket Head Cap Screw35
DIN 912 M8 × 40 Hexagon Socket Head Cap Screw40
DIN 912 M8 × 50 Hexagon Socket Head Cap Screw50
DIN 912 M8 × 60 Hexagon Socket Head Cap Screw60
DIN 912 M8 × 80 Hexagon Socket Head Cap Screw80
ISO 4762 M8 × 12 Hexagon Socket Head Cap Screw12
ISO 4762 M8 × 16 Hexagon Socket Head Cap Screw16
ISO 4762 M8 × 20 Hexagon Socket Head Cap Screw20
ISO 4762 M8 × 25 Hexagon Socket Head Cap Screw25
ISO 4762 M8 × 30 Hexagon Socket Head Cap Screw30
ISO 4762 M8 × 35 Hexagon Socket Head Cap Screw35
ISO 4762 M8 × 40 Hexagon Socket Head Cap Screw40
ISO 4762 M8 × 50 Hexagon Socket Head Cap Screw50
ISO 4762 M8 × 60 Hexagon Socket Head Cap Screw60
ISO 4762 M8 × 80 Hexagon Socket Head Cap Screw80
DIN 7991 M8 × 12 Hexagon Socket Countersunk Head Screw12
DIN 7991 M8 × 16 Hexagon Socket Countersunk Head Screw16
DIN 7991 M8 × 20 Hexagon Socket Countersunk Head Screw20
DIN 7991 M8 × 25 Hexagon Socket Countersunk Head Screw25
DIN 7991 M8 × 30 Hexagon Socket Countersunk Head Screw30
DIN 7991 M8 × 35 Hexagon Socket Countersunk Head Screw35
DIN 7991 M8 × 40 Hexagon Socket Countersunk Head Screw40
DIN 7991 M8 × 50 Hexagon Socket Countersunk Head Screw50
DIN 7991 M8 × 60 Hexagon Socket Countersunk Head Screw60
DIN 7991 M8 × 80 Hexagon Socket Countersunk Head Screw80
ISO 10642 M8 × 12 Hexagon Socket Countersunk Head Screw12
ISO 10642 M8 × 16 Hexagon Socket Countersunk Head Screw16
ISO 10642 M8 × 20 Hexagon Socket Countersunk Head Screw20
ISO 10642 M8 × 25 Hexagon Socket Countersunk Head Screw25
ISO 10642 M8 × 30 Hexagon Socket Countersunk Head Screw30
ISO 10642 M8 × 35 Hexagon Socket Countersunk Head Screw35
ISO 10642 M8 × 40 Hexagon Socket Countersunk Head Screw40
ISO 10642 M8 × 50 Hexagon Socket Countersunk Head Screw50
ISO 10642 M8 × 60 Hexagon Socket Countersunk Head Screw60
ISO 10642 M8 × 80 Hexagon Socket Countersunk Head Screw80

Showing the first 40 of 194 specification pages.