International Standards

MACHINING CALCULATING FORMULA for calculating the bore diameter of the tapping of extrusion wire:

Formula: External diameter of teeth – 1/2 *pitch

Example 1: Formula: M3 * 0.5 = 3 – (1/2 * 0.5) = 2.75mm

M6 x 1.0 = 6 – (1/2 x 1.0) = 5.5 mm

Example 2: Formula: M3 * 0.5 = 3 – (0.5/2) = 2.75 mm

M6*1.0=6-(1.0/2)=5.5 mm.

MACHINING CALCULATING FORMULA for English tapping:

1 inch = 25.4mm

Example 1: (1/4-30)

1/4 x 25.4 = 6.35 (Pitch Diameter )

25.4/30 = 0.846 (pitch)

The conversion from 1/4-30 to metric screw should be M6.35 * 0.846

Example 2: (3/16-32)

3/16*25.4=4.76 ( Pitch Diameter )

25.4/32 = 0.79 (pitch)

The conversion from 3/16-32 to metric screw should be M4.76 *0.79

Formulas for converting British thread into metric thread:

Molecular/Denominator x 25.4 =Pitch diameter

Example 1: (3/8-24)

3/8 x 25.4 = 9.525 ( Pitch Diameter )

25.4 24 = 1.058 ( METRIC THREAD )

The conversion from 3/8-24 to metric thread should be M9.525 * 1.058

MACHINING CALCULATING Formula for converting American-made thread into metric thread:

Example: 6-32

6-32 (0.06+0.013)/Code *6=0.138

0.138 * 25.4 = 3.505( Pitch Diameter )

25.4/32 = 0.635 (pitch)

The conversion of 6-32 to metric thread should be M3.505 * 0.635

1.Formula for calculating bore diameter:

External thread diameter- 1/2 * pitch should be:

M3.505-1/2*0.635=3.19

So the inner hole dia. of 6-32 should be 3.19

2.Inner Hole Tapping Algorithms for Extrusion Wire:

Calculating Lower hole diameter Formula 1:

External pitch diameter – (pitch * 0.4250.475) / code = lower hole diameter

Example 1: M6 *1.0

M6-(1.0 x 0.425) = 5.575 (maximum lower hole diameter)

M6-(1.0 x 0.475)= 5.525 (minimum lower hole diameter)

Example 2: Simple formulas for calculating lower hole diameter of tapped holes by cutting wire:

M6-(1.0 x 0.85) = 5.15 (maximum)

M6-(1.0 x 0.95)=5.05 (minimum)

M6-(pitch * 0.860.96)/Code = Lower hole diameter

Example 3: M6*1.0=6-1.0=5.0+0.05=5.05

Machining Calculating Formula for the External Diameter of Pressure Thread:

Diameter – 0.01 *0.645 *Pitch Distance

Example 1: M3 * 0.5 = 3-0.01*0.645 * 0.5 = 2.58 (external diameter)

Example 2: M6*1.0=6-0.1*0.645*1.0=5.25 (external diameter)

Formula for calculating roll diameter of metric thread: (full teeth)

Example 1: M3 x 0.5 = 3-0.6495 x 0.5 = 2.68 (outside diameter before turning)

Example 2: M6*1.0=6-0.6495*1.0=5.35 (outside diameter before turning)

External Diameter Depth (External Diameter) of Embossing

Outer diameter/25.4 * embossing pitch = outer diameter before embossing

Example: 4.1/25.4 x 0.8 (embossing pitch spacing) = 0.13 embossing depth should be 0.13.

Diagonal Conversion Formula for Polygonal Materials:

Formula 1:

Quadrangle: diagonal radius * 1.414 = diagonal radius

Pentagon: diagonal radius * 1.2361 = diagonal radius

Hexagonal: diagonal diameter * 1.1547 = diagonal diameter

Formula 2:

Four corners: diagonal radius/0.71 = diagonal radius

Hexagonal: diagonal radius/0.866 = diagonal radius

Tool Thickness (Cutter):

material outer diameter/10+0.7 Reference value

Formula for calculating taper:

Formula 1: (Big Head Diameter-Small Head Diameter)/( 2 x
Total Length of Taper) = Degrees

Equal to the value of a triangular function

Formula 2:

(Big Head Diameter-Small Head Diameter)/28.7/Total Length = Degrees

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