METRICcoarse60° flank

M2.5 × 0.45 Thread Dimensions

M2.5 x 0.45 is a coarse pitch METRIC thread. Pitch is 0.45 mm, equivalent to 56.44 threads per inch. The recommended tap drill leaves roughly 75% thread engagement.

Nominal Ø2.5 mm
Pitch0.45 mm
Threads per inch56.44
Pitch Ø2.21 mm
Tap drill2.05 mm

Thread profile

millimetres unless stated
Thread profile — M2.5 x 0.45d 2.5d2 2.21d3 1.95mm60°P 0.45h3 0.28tap ⌀2.05
M2.5 × 0.45 — basic profile60° flank angle · Not to scale
Designation
M2.5 x 0.45
Thread system
METRIC
Series
coarse
Flank angle
60°
Major diameter
2.5 mm / 0.1"
Pitch
0.45 mm
Threads per inch
56.44
Pitch diameter
2.21 mm
Minor diameter (external)
1.95 mm
Minor diameter (internal)
2.01 mm
Thread depth
0.28 mm
Recommended tap drill
Ø 2.05 mm / 0.08"

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 thread66 specification pages

All M2.5 fasteners
DIN 912ISO 4762DIN 84ISO 1207DIN 85ISO 1580DIN 963ISO 2009
SpecificationLength (mm)
DIN 912 M2.5 × 4 Hexagon Socket Head Cap Screw4
DIN 912 M2.5 × 5 Hexagon Socket Head Cap Screw5
DIN 912 M2.5 × 6 Hexagon Socket Head Cap Screw6
DIN 912 M2.5 × 8 Hexagon Socket Head Cap Screw8
DIN 912 M2.5 × 10 Hexagon Socket Head Cap Screw10
DIN 912 M2.5 × 12 Hexagon Socket Head Cap Screw12
DIN 912 M2.5 × 16 Hexagon Socket Head Cap Screw16
DIN 912 M2.5 × 20 Hexagon Socket Head Cap Screw20
DIN 912 M2.5 × 25 Hexagon Socket Head Cap Screw25
ISO 4762 M2.5 × 4 Hexagon Socket Head Cap Screw4
ISO 4762 M2.5 × 5 Hexagon Socket Head Cap Screw5
ISO 4762 M2.5 × 6 Hexagon Socket Head Cap Screw6
ISO 4762 M2.5 × 8 Hexagon Socket Head Cap Screw8
ISO 4762 M2.5 × 10 Hexagon Socket Head Cap Screw10
ISO 4762 M2.5 × 12 Hexagon Socket Head Cap Screw12
ISO 4762 M2.5 × 16 Hexagon Socket Head Cap Screw16
ISO 4762 M2.5 × 20 Hexagon Socket Head Cap Screw20
ISO 4762 M2.5 × 25 Hexagon Socket Head Cap Screw25
DIN 84 M2.5 × 4 Slotted Cheese Head Screw4
DIN 84 M2.5 × 5 Slotted Cheese Head Screw5
DIN 84 M2.5 × 6 Slotted Cheese Head Screw6
DIN 84 M2.5 × 8 Slotted Cheese Head Screw8
DIN 84 M2.5 × 10 Slotted Cheese Head Screw10
DIN 84 M2.5 × 12 Slotted Cheese Head Screw12
DIN 84 M2.5 × 16 Slotted Cheese Head Screw16
DIN 84 M2.5 × 20 Slotted Cheese Head Screw20
ISO 1207 M2.5 × 4 Slotted Cheese Head Screw — Product Grade A4
ISO 1207 M2.5 × 5 Slotted Cheese Head Screw — Product Grade A5
ISO 1207 M2.5 × 6 Slotted Cheese Head Screw — Product Grade A6
ISO 1207 M2.5 × 8 Slotted Cheese Head Screw — Product Grade A8
ISO 1207 M2.5 × 10 Slotted Cheese Head Screw — Product Grade A10
ISO 1207 M2.5 × 12 Slotted Cheese Head Screw — Product Grade A12
ISO 1207 M2.5 × 16 Slotted Cheese Head Screw — Product Grade A16
ISO 1207 M2.5 × 20 Slotted Cheese Head Screw — Product Grade A20
DIN 85 M2.5 × 4 Slotted Pan Head Screw4
DIN 85 M2.5 × 5 Slotted Pan Head Screw5
DIN 85 M2.5 × 6 Slotted Pan Head Screw6
DIN 85 M2.5 × 8 Slotted Pan Head Screw8
DIN 85 M2.5 × 10 Slotted Pan Head Screw10
DIN 85 M2.5 × 12 Slotted Pan Head Screw12

Showing the first 40 of 66 specification pages.