Общий каталог Yamawa 2022 - 2023 - страница 1194

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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.

SizeBasic Diameter Tolerance in radialThread Basic Diameter Position Pipe End Tolerance in axialStandards Effective T (Min When Threads have non-Full 1)f hread Length imum) When Threads do not have the non-Full 1)Pipe End (Workpiece Face) (Basic Diamater )Minor Diamet When Threads have non-Full Threads Position away from Pipe End by ℓer When Threads do not have the non-Full Threads Position away from Pipe End by tRecomme Hole Sizes Maximu Straight When Threads havended Bored (reference) m Size of Bored Hole When Threads do not haver Bas Long Threadeferenc Tap ic Diam Position ℓg Short Thread Ue eter , Rc nit：mm
directiondirection cThreads ℓThreads tBasic SizeBasic SizeBasic Sizenon-Full Threadsthe non-Full ThreadsTypeType
①②③④⑤⑥⑦⑧⑨⑩⑪⑫⑬
PT1/16- 28±0.071±1.136.24.46.5616.1746.2866.16.213.010.510.1
PT1/8- 28±0.071±1.136.24.48.5668.1798.2918.18.213.010.510.1
PT1/4- 19±0.104±1.679.46.711.44510.85811.02610.710.921.012.515.0
PT3/8- 19±0.104±1.679.77.014.95014.34414.51314.214.421.014.015.4
PT1/2- 14±0.142±2.2712.79.118.63117.83718.06217.617.925.017.020.5
PT5/8- 14±0.142±2.27(13.4)(9.65)20.58719.75019.98419.619.825.0--
PT3/4- 14±0.142±2.2714.110.224.11723.23623.48023.023.325.019.021.8
PT7/8- 14±0.142±2.27(15.2)(10.9)27.87726.93027.19626.727.028.0--
PT1 - 11±0.181±2.8916.211.630.29129.27929.56629.029.332.022.026.0
PT11/8- 11±0.181±2.89（17.4）（12.5）34.93933.85534.15833.633.932.0--
PT11/4- 11±0.181±2.8918.513.438.95237.79638.11537.637.932.024.528.3
PT11/2- 11±0.181±2.8918.513.444.84543.68944.00843.543.832.025.528.3
PT13/4- 11±0.181±2.89（18.5）（13.4）50.78849.63249.95149.449.732.0--
PT2 - 11±0.181±2.8922.816.956.65655.23155.60055.055.435.027.532.7
PT21/4- 11±0.216±3.46（26.7）（18.6）62.75261.08361.59060.861.350.0--
PT21/2- 11±0.216±3.4626.718.672.22670.55771.06470.370.850.032.037.1
PT3 - 11±0.216±3.4629.821.184.92683.06483.60782.883.352.036.040.2
PT31/2- 11±0.216±3.4631.422.497.37295.41095.97295.195.752.0-46.2
PT4 - 11±0.216±3.4635.825.9110.072107.835108.453107.6108.255.0-46.2

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 haveWhen Threads do not haveRemarks 2.Effective Thread Length has 2 types, with
non-Full Threadsthe non-Full Threads
⑥ ⑥non-Full Thread Type and without non-Full
Basic Diameter PositionThread 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 Infdiameter 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.