Общий каталог Yamawa 2022 - 2023 - страница 1208

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Bar diameter of external threads (for thread rolling dies) Surface Treatment

○NRS-D recommendation for bar diameter The best surface treatment is applied to each tap depending on the tapping purpose.

  • Recommended bar diameters for MS-R-SD Miniature external threadsfor metric external threads

Unit：mm Characteristics and effectiveness of surface treatment are introduced at next section. Unit : mm

iClRecommended barMajor diameterof external thread
szeassdiameterMax.Min.
S0.5X0.125R20.4100.5000.480
S0.6X0.15R20.4950.6000.575
S0.7X0.175R30.5700.7000.675
S0.8X0.2R30.6550.8000.770
S0.9X0.225R30.7400.9000.870

M8×1.25 7.10 7.07

The major diameters of external threads are based on the tolerance class 5h3 of JIS B 0201.

  • Recommended bar diameters for RS-D Metric external threads

improve the surface roughness of internal screw. Moreover, longer tool life is expected because the treatment reduces the remaining stress of HSS tools. Unit：mm ○This treatment does not increase the hardness on tool surface. Using the furnace of YAMAWA original design and choosing the proper treatment

RecommendedMajor diameter of externalthread
sizeClassbar diameterCurrent JISOldJIS
Current JISOld JISMax.Min.Max.Min.
R20.8150.815
M1X0.25R30.8000.8001.0000.9330.9850.940
R40.7800.780
R10.9300.930
M1.1X0.25R20.9150.9151.1001.0331.1001.033
R30.9000.900
R21.0151.015
M1.2X0.25R30.9950.9951.2001.1331.1851.140
R40.9800.980
R21.1801.180
M1.4X0.3R31.1651.1651.4001.3251.3801.320
R41.1501.145
R21.3451.345
M1.6X0.35R31.3301.3301.5811.4961.5811.496
R41.3151.315
R21.4451.450
※ M1.7X0.35R31.4301.4301.6811.5961.6801.610
R41.4151.415
R21.5451.545
M1.8X0.35R31.5301.5301.7811.6961.7811.696
R41.5151.515
R21.7151.715
M2X0.4R31.7001.7001.9811.8861.9801.890
R41.6801.680
R21.8101.810
M2X0.25R31.7901.7951.9821.9151.9801.930
R41.7751.775
R21.881.88
M2.2X0.45R31.871.872.1802.0802.1802.080
R41.851.85
RecommendedMajor diameter of externalthread
sizeClassbar diameterCurrent JISOldJIS
Current JISOld JISMax.Min.Max.Min.
R22.012.01
※ M2.3X0.4R32.002.002.2812.1862.2802.190
R41.981.98
R22.112.11
※ M2.3X0.25R32.092.092.2822.2152.2802.230
R42.072.07
R22.182.18
M2.5X0.45R42.152.152.4802.3802.4802.380
R52.132.13
R22.242.24
M2.5X0.35R32.232.232.4812.3962.4812.396
R42.212.21
R22.282.28
※ M2.6X0.45R42.252.252.5802.4802.5802.480
R52.232.23
R22.342.34
※ M2.6X0.35R42.312.312.5812.4962.5802.480
R52.292.29
R22.652.65
M3X0.5R42.622.622.9802.8742.9802.874
R52.602.60
R22.742.74
M3X0.35R42.712.712.9812.8962.9802.880
R52.692.69
R23.243.24
M3.5X0.35R43.213.213.4813.3963.4803.380
R53.193.19
R33.633.63
M4X0.5R53.603.593.9803.8743.9703.860
R63.583.58
R34.634.63
M5X0.5R44.614.614.9804.8744.9704.860
R5 R64.59 4.584.59 4.58

○Stainless steel and low carbon steel are the materials that are easy to get welding. We are applying this treatment to the special purpose taps for

Tapping Speed : 7.2m/min

Tapping Machine : CNC tapping machine

(minute) (Bright) (Oxide treated)

RecommendedMajor diameter of externalthread
sizeClassbar diameterCurrent JISOldJIS
Current JISOld JISMax.Min.Max.Min.
M3X0.5R42.622.622.9802.8742.9802.874
M4X0.7R43.493.493.9783.8383.9783.838
M5X0.8R54.414.414.9764.8264.9764.826
M6X1R55.285.285.9745.7945.9705.820
M8X1.25R67.107.117.9727.7607.9607.790

Current JIS: Tolerance class 6g (M1.6 or larger), 6h (M1.4 or smaller)

  • JIS: Class 2

Current JIS: Tolerance class 6g Old JIS: Class 2