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■ Recommended Bored Hole Size Table for Taper Pipe Threads (PT) (refer to JIS B 0203)

<Remarks during tapping>

・PT internal threads have R design on their crests. The taps should cut threads with their thread root. ・ On thread having non-full threads, if you are going to cut effective thread length ℓ , use the tap of long type.

Unit：mm

Thread Standards Minor Diameter Recommended Bored reference

Hole Sizes (reference) Tap When When

B Threads Threads

asic Diameter Effective Thread Length

Pipe End have do not have Basic Diameter

Basic Position (Minimum)

(Workpiece non-Full the non-Full Maximum Size of

Diameter Position,

Face) Threads Threads Straight Bored Hole

ℓg Size (Basic Position

Pipe End When When Position

Diamater )

Threads Threads away from away from

When When

have do not have Pipe End Pipe End

r Tolerance in Threads Threads Long Short

Tole ance non-Full the non-Full by ℓ by t

axial have do not have Thread Thread Rc

in radial Threads

direction 1) Threads1) Basic Basic Basic non-Full the non-Full Type Type

direction ℓ t

c Size Size Size Threads Threads

①②③④⑤⑦ ⑥⑧ ⑨⑩⑪⑫⑬
PT1/16- 28±0.071± 1.136.24.46.561 6.1746.2866.16.213.0 10.5 10.1
PT1/8 - 28±0.071± 1.136.24.48.566 8.1798.2918.18.213.0 10.5 10.1
PT1/4 - 19± 0.104± 1.679.46.711.445 10.85811.02610.710.921.0 12.5 15.0
PT3/8 - 19± 0.104± 1.679.77.014.950 14.34414.51314.214.421.0 14.0 15.4
PT1/2 - 14± 0.142± 2.2712.79.118.631 17.837 18.06217.617.925.0 17.0 20.5
PT5/8 - 14± 0.142± 2.27(13.4)(9.65)20.587 19.75019.98419.619.825.0--
PT3/4 - 14± 0.142± 2.2714.110.224.117 23.236 23.48023.023.325.0 19.0 21.8
PT7/8 - 14± 0.142± 2.27(15.2)(10.9)27.877 26.93027.19626.727.028.0--
PT1 - 11± 0.181± 2.8916.211.630.291 29.279 29.56629.029.332.0 22.0 26.0
PT 1 1/8 - 11± 0.181± 2.89（17.4）（12.5）34.939 33.85534.15833.633.932.0--
PT 1 1/4 - 11± 0.181± 2.8918.513.438.952 37.79638.11537.637.932.0 24.5 28.3
PT 1 1/2 - 11± 0.181± 2.8918.513.444.845 43.689 44.00843.543.832.0 25.5 28.3
PT 1 3/4 - 11± 0.181± 2.89（18.5）（13.4）50.788 49.63249.95149.449.732.0--
PT2 - 11± 0.181± 2.8922.816.956.656 55.231 55.60055.055.435.0 27.5 32.7
PT 2 1/4 - 11±0.216± 3.46（26.7）（18.6）62.752 61.08361.59060.861.350.0--
PT 2 1/2 - 11±0.216± 3.4626.718.672.226 70.55771.06470.370.850.0 32.0 37.1
PT3 - 11±0.216± 3.4629.821.184.926 83.064 83.60782.883.352.0 36.0 40.2
PT 3 1/2 - 11±0.216± 3.4631.422.497.372 95.41095.97295.195.752.0-46.2
PT4 - 11±0.216± 3.4635.825.9110.072107.835 108.453107.6108.255.0-46.2

Note 1) Length toward End of Smaller Diameter from Basic Diameter Position

Remarks 1. Opening of Internal Thread (Face of workpiece) is Basic Diameter Position.

When Threads have When Threads do not have Remarks 2. Effective Thread Length has 2 types, with

non-Full Threads the non-Full Threads

⑥ ⑥ non-Full Thread Type and without non-Full

Basic Diameter Position Thread Type. Remarks 3. Concerning bored hole shape, considering load on taps, taper bored hole is recommended. Remarks 4. When a prepared hole is tapered, use a synchronized feed tapping machine. Remarks 5. When applying taper bored hole, by referring to values shown in columns ② · ⑦ ⑥〜⑧ , prepare the taper hole by using pipe ⑧ reamer (1/16 taper). By referring to values shown in columns ⑨ and ⑩ , select the drill Technical Inf diameter before reaming by taking reamer's margin into account. Remarks 6. When preparing straight bored hole, by referring to values shown in columns ⑨ and ⑩ , select drill diameter.