ThreadRef

Sizes · Metric (ISO)

Metric coarse

M1.4 × 0.3

Tap drill 1.1 mm for a M1.4 × 0.3 thread — major Ø 1.4 mm, pitch 0.3 mm (84.67 TPI).

Tap-drill calculatorIdentify a thread
Tap drill
1.1 mm
1.1 mm · ≈77% thread

Profile

Thread form & key diameters

Major Ø 1.4 mmP 0.3 mm60°Minor Ø 1.032 mm · Pitch Ø 1.205 mmM1.4 × 0.384.67 TPI · 60° form

Dimensions

DesignationM1.4 × 0.3
Major (outside) diameter1.4 mm · 0.0551"
Pitch0.3 mm · 84.67 TPI
Pitch diameter1.205 mm · 0.0474"
Minor diameter (external)1.032 mm · 0.0406"
Minor diameter (internal)1.075 mm · 0.0423"
Recommended tap drill1.1 mm · ≈77% thread
Clearance holeClose 1.5 · Normal 1.6 · Loose 1.8 mm

ISO 273 clearance holes (fine / medium / coarse).

What tap drill do I need for M1.4 × 0.3?

For a M1.4 × 0.3 thread, drill the hole with a 1.1 mm tap drill (1.1 mm — the standard D − P rule) before tapping. That produces roughly 77% thread engagement, the usual target for a strong, tappable hole. The mating bolt has a major diameter of 1.4 mm and a pitch of 0.3 mm (84.67 TPI).

To pass a M1.4 × 0.3 bolt through a part rather than thread it, use a clearance hole: Close 1.5 · Normal 1.6 · Loose 1.8 mm.

All values are generated from the standard thread formulas (ISO 68-1 / ASME B1.1) and published standard tables — not hand-entered. See the full reference.

Nearby sizes

More metric coarse threads

M1.2 × 0.25Tap 0.95 mmØ 1.2 mm · pitch 0.25 mmM1.6 × 0.35Tap 1.25 mmØ 1.6 mm · pitch 0.35 mmM1 × 0.25Tap 0.75 mmØ 1 mm · pitch 0.25 mmM1.8 × 0.35Tap 1.45 mmØ 1.8 mm · pitch 0.35 mmM2 × 0.4Tap 1.6 mmØ 2 mm · pitch 0.4 mmM2.5 × 0.45Tap 2.05 mmØ 2.5 mm · pitch 0.45 mmM3 × 0.5Tap 2.5 mmØ 3 mm · pitch 0.5 mmM3.5 × 0.6Tap 2.9 mmØ 3.5 mm · pitch 0.6 mm