Specifications for External Thread and Internal Thread, Keyways, Holes and Pockets

External Thread and Internal Thread

The list of supported external and internal threads is as follows.

Caution

Threads that are not listed in the specification table are not supported.

Caution

  • The automatic hole type recognition function is not supported for the inner diameter in round object machining. Configure the settings on 3D Viewer.
  • For differences between inner diameters and holes, please click here.→Design Guidelines＞Turning Parts Recognition Conditions＞Outer- and Inner Diameter Recognition Conditions
〇​ External Thread and Internal Thread are available for Automatic quotation
⚫️​ Tapped holes machined by MC are available for automatic quotation
△​
  • Supported for automatic quotation upon acceptance of Quality Agreement
  • *Since there are no bolts and nuts for inspection, products are machined using target values of metric thread standard dimensions and shipped without inspection
✖​ Cannot be machined
Nominal Diameter​ Model Diameter (ø) mm Pitch1​ External Thread Internal Thread・Tapped Holes Pitch2 External Thread Internal Thread・Tapped Holes Pitch3 External Thread Internal Thread・Tapped Holes Pitch4 External Thread Internal Thread・Tapped Holes Pitch5 External Thread Internal Thread・Tapped Holes
External Thread Internal Thread Right-Hand Thread Left-Hand Thread Right-Hand Thread Left-Hand Thread Right-Hand Thread Left-Hand Thread Right-Hand Thread Left-Hand Thread Right-Hand Thread Left-Hand Thread Right-Hand Thread Left-Hand Thread Right-Hand Thread Left-Hand Thread Right-Hand Thread Left-Hand Thread Right-Hand Thread Left-Hand Thread Right-Hand Thread Left-Hand Thread
M2 1.7~2 1.5～2 0.4 〇 〇 〇⚫️ 〇 0.25 〇 △ 〇⚫️ △
M2.2 1.7～2.2 1.7～2.2 0.45 〇 △ 〇⚫️ ✖ 0.25 〇 △ 〇⚫️ ✖
M2.5 2.2～2.5 2～2.5 0.45 〇 〇 〇⚫️ ✖ 0.35 〇 △ 〇⚫️ ✖
M3 2.6～3 2.4～3 0.5 〇 〇 〇⚫️ 〇 0.35 〇 △ 〇⚫️ △
M3.5 3.1～3.5 2.8～3.5 0.6 〇 △ 〇⚫️ △ 0.35 〇 △ 〇⚫️ △
M4 3.5～4 3.2～4 0.7 〇 〇 〇⚫️ 〇 0.5 〇 △ 〇⚫️ △
M4.5 4～4.5 3.6～4.5 0.75 〇 △ 〇⚫️ △ 0.5 〇 △ 〇⚫️ △
M5 4.4～5 4.1～5 0.8 〇 〇 〇⚫️ 〇 0.5 〇 △ 〇⚫️ △
M5.5 5.1～5.5 4.9～5.5 0.5 〇 △ 〇⚫️ △
M6 5.3～6 4.9～6 1.0 〇 〇 〇⚫️ 〇 0.75 〇 〇 〇⚫️ 〇
M7 6.3～7 5.9～7 1.0 〇 △ 〇⚫️ △ 0.75 〇 △ 〇⚫️ ✖
M8 7.1～8 6.6～8 1.25 〇 〇 〇⚫️ 〇 1.0 〇 〇 〇⚫️ 〇 0.75 〇 △ 〇⚫️ △
M9 8.1～9 7.6～9 1.25 〇 △ 〇⚫️ △ 1.0 〇 △ 〇⚫️ △ 0.75 〇 △ 〇⚫️ ✖
M10 9～10 8.3～10 1.5 〇 〇 〇⚫️ 〇 1.25 〇 △ 〇⚫️ 〇 1.0 〇 △ 〇⚫️ 〇 0.75 〇 △ 〇⚫️ △
M11 10～11 9.3～11 1.5 〇 △ 〇⚫️ △ 1.0 〇 △ 〇⚫️ ✖ 0.75 〇 △ 〇⚫️ ✖
M12 10.8～12 10.1～12 1.75 〇 〇 〇⚫️ 〇 1.5 〇 〇 〇⚫️ △ 1.25 〇 〇 〇⚫️ 〇 1.0 〇 △ 〇⚫️ 〇
M14 12.7～14 11.8～14 2.0 〇 〇 〇⚫️ 〇 1.5 〇 〇 〇⚫️ 〇 1.25 〇 △ 〇⚫️ △ 1.0 〇 △ 〇⚫️ △
M15 14～15 13.3～15 1.5 〇 △ 〇⚫️ △ 1.0 〇 △ 〇⚫️ △
M16 14.7～16 13.8～16 2.0 〇 〇 〇⚫️ 〇 1.5 〇 〇 〇⚫️ 〇 1.0 〇 △ 〇⚫️ △
M17 16～17 15.3～17 1.5 〇 △ 〇⚫️ △ 1.0 〇 △ 〇⚫️ △
M18 16.3～18 15.2～18 2.5 〇 〇 〇⚫️ 〇 2.0 〇 △ 〇⚫️ △ 1.5 〇 〇 〇⚫️ 〇 1.0 △ △ 〇⚫️ △
M20 18.3～20 17.2～20 2.5 〇 〇 〇⚫️ 〇 2.0 〇 △ 〇⚫️ △ 1.5 〇 〇 〇⚫️ 〇 1.0 〇 △ 〇⚫️ △
Nominal Diameter​ Model Diameter (ø) mm Pitch1​ External Thread Internal Thread Pitch2 External Thread Internal Thread Pitch3 External Thread Internal Thread Pitch4 External Thread Internal Thread Pitch5 External Thread Internal Thread
External Thread Internal Thread Right-Hand Thread Left-Hand Thread Right-Hand Thread Left-Hand Thread Right-Hand Thread Left-Hand Thread Right-Hand Thread Left-Hand Thread Right-Hand Thread Left-Hand Thread Right-Hand Thread Left-Hand Thread Right-Hand Thread Left-Hand Thread Right-Hand Thread Left-Hand Thread Right-Hand Thread Left-Hand Thread Right-Hand Thread Left-Hand Thread
M22 20.3～22 19.2～22 2.5 〇 〇 〇 〇 2.0 〇 △ 〇 △ 1.5 〇 〇 〇 〇 1.0 〇 △ 〇 △
M24 22～24 20.7～24 3.0 〇 〇 〇 〇 2.0 〇 〇 〇 △ 1.5 〇 〇 〇 〇 1.0 〇 △ 〇 △
M25 23.7～25 22.8～25 2.0 〇 △ 〇 △ 1.5 〇 △ 〇 △ 1.0 〇 〇 〇 △
M26 25～26 24.3～26 1.5 〇 △ 〇 △
M27 25～27 23.7～27 3.0 〇 〇 〇 〇 2.0 〇 〇 〇 △ 1.5 〇 〇 〇 △ 1.0 〇 △ 〇 △
M28 26.7～28 25.8～28 2.0 〇 △ 〇 △ 1.5 〇 △ 〇 △ 1.0 〇 △ 〇 △
M30 27.7～30 26.2～30 3.5 〇 〇 〇 〇 3.0 〇 △ 〇 △ 2.0 〇 〇 〇 △ 1.5 〇 〇 〇 〇 1.0 〇 △ 〇 △
M32 30.7～32 29.8～32 2.0 〇 △ 〇 △ 1.5 〇 △ 〇 △
M33 30.7～33 29.2～33 3.5 〇 〇 〇 〇 3.0 〇 △ △ △ 2.0 〇 〇 〇 △ 1.5 〇 △ 〇 △
M35 34～35 33.3～35 1.5 〇 △ 〇 △
M36 33.4～36 31.6～36 4.0 〇 〇 〇 〇 3.0 〇 △ 〇 △ 2.0 〇 〇 〇 〇 1.5 〇 △ 〇 △
M38 37～38 36.3～38 1.5 〇 △ 〇 △
M39 36.4～39 34.6～39 4.0 〇 〇 〇 〇 3.0 〇 △ 〇 △ 2.0 〇 △ 〇 △ 1.5 △ 〇 △ △
M40 38～40 36.7～40 3.0 〇 △ △ 〇 2.0 〇 △ 〇 △ 1.5 〇 △ 〇 △
M42 39～42 37.1～42 4.5 〇 〇 〇 〇 4.0 〇 △ △ △ 3.0 〇 〇 〇 △ 2.0 〇 △ 〇 △ 1.5 △ △ 〇 △
M45 42～45 40.1～45 4.5 〇 △ 〇 〇 4.0 △ △ △ △ 3.0 〇 △ 〇 △ 2.0 〇 △ 〇 △ 1.5 〇 △ 〇 △
M48 44.7～48 42.5～48 5.0 〇 〇 〇 〇 4.0 △ △ △ △ 3.0 〇 △ 〇 △ 2.0 〇 〇 〇 △ 1.5 〇 △ 〇 △
M50 48～50 46.7～50 3.0 △ △ △ △ 2.0 △ △ △ △ 1.5 △ △ 〇 △

Notes

The automatic hole type recognition function is supported in the same way as for edged object machining.

Insert Holes

  • When the quoted material is aluminum・Resin in Settings for Insert Holes, the insert can be selected using the logic equivalent to that used for inner diameter internal thread recognition for round object machining.
  • The insert material is 1.4301 Stainless Steel.​
  • There are four nominal lengths for each diameter: 0.5D, 1D, 1.5D and 2D.
Insert material: 304 Stainless Steel

[mm]

Insert Pitch
Nominal Diameter
M2 0.4
M2.5 0.45
M3 0.5
M4 0.7
M5 0.8
M6 1.0
M8 1.25
M10 1.5
M12 1.75

Keyways

  • For keyways that match the JIS (B 1301:1996), tolerances are automatically set and can be changed in the dialog.
  • *The default settings can be customised in user settings.
23563_01_deEN
23563_02_deEN
[mm]
b1 and b2
Key Dimensions
 b1 Tolerance b2 Tolerance t1 Key Dimensions t1 Tolerance t2 Key Dimensions t2 Tolerance
P9 N9 H9 P9 Js9 D10
2
  • -0.006
  • -0.031
  • -0.004
  • -0.029
  • +0.025
  • 0
  • -0.006
  • -0.031
 ±0.0125
  • +0.060
  • +0.020
 1.2
  • +0.1
  • 0
 1.0
  • +0.1
  • 0
3 1.8 1.4
4
  • -0.012
  • -0.042
  • 0
  • -0.030
  • +0.030
  • 0
  • -0.012
  • -0.042
 ±0.0150
  • +0.078
  • +0.030
 2.5 1.8
5 3.0 2.3
6 3.5 2.8
8
  • -0.015
  • -0.051
  • 0
  • -0.036
  • +0.036
  • 0
  • -0.015
  • -0.051
 ±0.0180
  • +0.098
  • +0.040
 4.0
  • +0.2
  • 0
 3.3
  • +0.2
  • 0
10 5.0
12
  • -0.018
  • -0.061
  • 0
  • -0.043
  • +0.043
  • 0
  • -0.018
  • -0.061
 ±0.0215
  • +0.120
  • +0.050
14 5.5 3.8
16 6.0 4.3
18 7.0 4.4
20
  • -0.022
  • -0.074
  • 0
  • -0.052
  • +0.052
  • 0
  • -0.022
  • -0.074
 ±0.0260
  • +0.149
  • +0.065
 7.5 4.9
22 9.0 5.4
25
28 10 6.4
32
  • -0.026
  • -0.088
  • 0
  • -0.062
  • +0.062
  • 0
 -0.026 -0.088 ±0.0310
  • +0.180
  • +0.080
 11 7.4

Precision Holes

  • Precision holes are straight holes with either a fit tolerance, a bidirectional tolerance, or a unidirectional tolerance selected for the hole diameter tolerance.
  • The accuracy and effective depth for the diameter can be specified with precision holes.
Accuracy ranges supported for automatic quotation
[mm]
Diameter Accuracy Range
> ≤ Fit Tolerance Bidirectional Tolerance< Minimum Value Unidirectional Tolerance Minimum Value (Range)
2.999 3 Grade IT7 or higher 0.005 0.01
3 6 0.006 0.012
6 10 0.008 0.015
10 18 0.009 0.018
18 30 0.011 0.021
30 50 0.013 0.025
50 80 0.015 0.03
80 120 0.018 0.035
120 180 0.02 0.04
180 250 0.023 0.046
250 315 0.026 0.052
315 400 0.029 0.057
400 500 0.032 0.064

Countersunk Holes

Holes with the following shapes on the right and left end faces are recognised as countersunk holes.　
  • *Countersunk hole shapes modelled on the cylinder side are not recognised as countersunk holes.
  • ・ Countersunk (on a conical shape) angle is 90°
  • ・ d is 3.0 mm or more
  • ・D/d: When d ≧ 4.0 mm, D > 1.4 d
  • 　　　 When d < 4.0 mm, D > 1.7 d

Pockets and Slotted Holes

The width that can be machined for pockets and slotted holes is 2.0 mm or more.

Pocket

Pocket

Slotted Hole

Retaining ring

Required groove width for retaining rings
Retaining Rings / External / C-Type
Applicable axis
Retaining Rings / Internal / C-Type
Applicable grooving
Reference values for C-Type retaining ring “t,” “m,” and “Corner R”
t: Retaining ring width m: Required groove width Corner R
1 1.15 R0.1 or less
1.25 1.35
1.5 1.65 R0.15 or less
1.75 1.9
2 2.2 R0.2 or less
2.5 2.7
3 3.2
4 4.2

Notes

  • It is recommended that diameters d1 and d2 are designed to meet the standard for C-type retaining rings.
  • *E-type rings for small diameters are not available

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