SFU [SS] Type

三木プーリのサーボフレックスSFUモデル SFU-SSタイプ 金属板ばねカップリング製品画像（軸ずれ吸収・高剛性サーボモータ用高精度軸継手）
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This is a leaf spring coupling made of steel, featuring a design where the flange—which attaches to the shaft—and the coupling unit can be separated. This not only facilitates high-precision assembly but also allows the drive and driven shafts to be disengaged without moving them during maintenance. It is a single-element coupling with high rigidity.

SFU-□SS (Key) Type

[Specifications]

Model Rated Torque [N·m] Tolerance Maximum Rotational Speed [min⁻¹] Torsional spring constant [N·m/rad] Axial spring constant [N/mm] Moment of inertia [kg·m²] Mass [kg]
Eccentricity [mm] Angular displacement [°] Axial [mm]
SFU-070SS-100N 100 0.02 1 ±0.5 18,000 240,000 484 0.53×10⁻³ 0.86
SFU-080SS-200N 200 0.02 1 ±0.5 17,000 310,000 546 1.26×10⁻³ 1.52
SFU-090SS-300N 300 0.02 1 ±0.6 15,000 520,000 321 2.01×10⁻³ 1.90
SFU-100SS-450N 450 0.02 1 ±0.65 13,000 740,000 540 3.88×10⁻³ 3.01
SFU-120SS-600N 600 0.02 1 ±0.8 11,000 970,000 360 8.17×10⁻³ 4.31
SFU-140SS-1000N 1000 0.02 1 ±1.0 9500 1,400,000 64 18.43×10⁻³ 6.93
  • The maximum rotational speed does not take dynamic balance into account.
  • The torsional spring constant value refers to the value for a single element.
  • The moment of inertia and mass are based on the maximum bore diameter.

[Dimensions]

三木プーリのサーボフレックスSFUモデル SFU-SSタイプ 金属板ばねカップリング寸法図（軸ずれ吸収・高剛性サーボモータ用高精度軸継手）
Model d1・d2 [mm] D [mm] N [mm] L [mm] LM [mm] LS [mm] LF[mm] S[mm] F[mm] d3 [mm] K[mm] M1 Quantity - Nominal M1 Tightening Torque [N·m]
Minimum Max
SFU-070SS-100N 8 25 68 40 69.9 28.7 23.9 23 5.9 1 36 38 6-M4 3.4
SFU-080SS-200N 11 35 78 54 82.7 36.5 30.7 26 7.7 5 38 42 6-M6 14
SFU-090SS-300N 11 38 88 58 90.3 37.3 30.3 30 8.3 2 48 50 6-M6 14
SFU-100SS-450N 16 42 98 68 106.2 43.2 36.2 35 10.2 0 50 56 6-M8 34
SFU-120SS-600N 19 50 118 78 112.2 43.2 36.2 38 10.2 1 66 68 6-M8 34
SFU-140SS-1000N 22 60 138 88 131.6 48.6 41.6 45 10.6 8 76 78 6-M8 34
  • The designation for an M1 bolt consists of the quantity followed by the thread size, where the quantity refers to the number of flanges on one side.

[Standard Hole Diameter]

Model Nominal Standard Hole Diameter d1・d2 [mm]
8 9 10 11 12 14 15 16 17 18 19 20 22 24 25 28 30 32 35 38 40 42 45 48 50 55 56 60
SFU-070SS-□-□-100N d1 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
d2 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
SFU-080SS-□-□-200N d1 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
d2 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
SFU-090SS-□-□-300N d1 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
d2 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
SFU-100SS-□-□-450N d1 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
d2 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
SFU-120SS-□-□-600N d1 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
d2 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
SFU-140SS-□-□-1000N d1 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
d2 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●
  • The hole diameters indicated by the ● symbol are standard hole diameters. For details, please refer to the standard hole machining specifications.
三木プーリのサーボフレックスシリーズSFUモデル SSタイプ 金属板ばねカップリング ご注文時の型式構成説明図

[Standard Hole Machining Specifications]

?
Keyway Dimensions Table
Unit [mm]
Compatible with Old JIS (Type 2) Standards Compliant with New JIS (H9) Standard Compliant with New JIS (JS 9) Standard Compliant with New JIS (P9) Standard
Nominal hole diameter Hole diameter
(d1, d2)		 Keyway width
(W1, W2)		 Keyway depth
(T1, T2)		 Set screw hole
(M)		 Nominal hole diameter Hole diameter
(d1, d2)		 Keyway width
(W1, W2)		 Keyway depth
(T1, T2)		 Set screw hole
(M)		 Nominal hole diameter Hole diameter
(d1, d2)		 Keyway width
(W1, W2)		 Keyway depth
(T1, T2)		 Set screw hole
(M)		 Nominal hole diameter
H7, H8 E9 +0.3
0		 － H7, H8 H9 +0.3
0		 － H7, H8 JS9 +0.3
0		 －
8 8 +0.0220 － － 2–M4 8H 8 + 0.0220 3 + 0.0250 9.4 2-M4 8J 8+0.0220 3±0.0125 9.4 2-M4 8P
9 9 + 0.0220 － － 2-M4 9H 9 + 0.0220 3 + 0.0250 10.4 2-M4 9J 9+0.0220 3±0.0125 10.4 2-M4 9P
10 10 + 0.0220 － － 2-M4 10H 10 + 0.0220 3 + 0.0250 11.4 2-M4 10J 10 + 0.0220 3±0.0125 11.4 2-M4 10P
11 11 + 0.0180 － － 2-M4 11H 11 + 0.0180 4 + 0.0300 12.8 2-M4 11J 11+0.0180 4±0.0150 12.8 2-M4 11P
12 12+0.0180 4 + 0.050 + 0.020 13.5 2–M4 12H 12 + 0.0180 4 + 0.0300 13.8 2-M4 12J 12+0.0180 4±0.0150 13.8 2-M4 12P
14 14+0.0180 5 + 0.050 + 0.020 16.0 2–M4 14H 14 + 0.0180 5 + 0.0300 16.3 2-M4 14J 14+0.0180 5±0.0150 16.3 2-M4 14P
15 15 + 0.0180 5 + 0.050 + 0.020 17.0 2-M4 15H 15 + 0.0180 5 + 0.0300 17.3 2-M4 15J 15+0.0180 5±0.0150 17.3 2-M4 15P
16 16+0.0180 5 + 0.050 + 0.020 18.0 2–M4 16H 16 + 0.0180 5 + 0.0300 18.3 2-M4 16J 16+0.0180 5±0.0150 18.3 2-M4 16P
17 17 + 0.0180 5 + 0.050 + 0.020 19.0 2–M4 17H 17+0.0180 5 + 0.0300 19.3 2-M4 17J 17+0.0180 5±0.0150 19.3 2-M4 17P
18 18 + 0.0180 5 + 0.050 + 0.020 20.0 2-M4 18H 18 + 0.0180 6 + 0.0300 20.8 2-M5 18J 18 + 0.0180 6±0.0150 20.8 2-M5 18P
19 19 + 0.0210 5 + 0.050 + 0.020 21.0 2–M4 19H 19 + 0.0210 6 + 0.0300 21.8 2-M5 19J 19+0.0210 6±0.0150 21.8 2-M5 19P
20 20 + 0.0210 5 + 0.050 + 0.020 22.0 2–M4 20H 20 + 0.0210 6 + 0.0300 22.8 2-M5 20J 20 + 0.0210 6±0.0150 22.8 2-M5 20P
22 22.0210 7 + 0.061 + 0.025 25.0 2–M6 22H 22 + 0.0210 6 + 0.0300 24.8 2-M5 22J 22 + 0.0210 6±0.0150 24.8 2-M5 22P
24 24 + 0.0210 7 + 0.061 + 0.025 27.0 2–M6 24H 24 + 0.0210 8 + 0.0360 27.3 2-M6 24J 24+0.0210 8±0.0180 27.3 2-M6 24P
25 25 + 0.0210 7 + 0.061 + 0.025 28.0 2–M6 25H 25 + 0.0210 8 + 0.0360 28.3 2-M6 25J 25+0.0210 8±0.0180 28.3 2-M6 25P
28 28.0210 7 + 0.061 + 0.025 31.0 2–M6 28H 28 + 0.0210 8 + 0.0360 31.3 2-M6 28J 28+0.0210 8±0.0180 31.3 2-M6 28P
30 30 + 0.0210 7 + 0.061 + 0.025 33.0 2–M6 30H 30 + 0.0210 8 + 0.0360 33.3 2–M6 30J 30 + 0.0210 8±0.0180 33.3 2-M6 30P
32 32 + 0.0250 10 + 0.061 + 0.025 35.5 2–M8 32H 32 + 0.0250 10 + 0.0360 35.3 2-M8 32J 32 + 0.0250 10±0.0180 35.3 2-M8 32P
35 35.000250 10 + 0.061 + 0.025 38.5 2–M8 35H 35 + 0.0250 10 + 0.0360 38.3 2-M8 35J 35+0.0250 10±0.0180 38.3 2-M8 35P
38 38.00000000000000000000000000000000000000000000000000000000000000 10 + 0.061 + 0.025 41.5 2-M8 38H 38 + 0.0250 10 + 0.0360 41.3 2-M8 38J 38+0.0250 10±0.0180 41.3 2-M8 38P
40 40+0.0250 10 + 0.061 + 0.025 43.5 2–M8 40H 40 + 0.0250 12 + 0.0430 43.3 2-M8 40J 40 + 0.0250 12±0.0215 43.3 2-M8 40P
42 42 + 0.0250 12 + 0.075 + 0.032 45.5 2–M8 42H 42 + 0.0250 12 + 0.0430 45.3 2-M8 42J 42 + 0.0250 12±0.0215 45.3 2-M8 42P
45 45.0250 12 + 0.075 + 0.032 48.5 2–M8 45H 45 + 0.0250 14 + 0.0430 48.8 2-M10 45J 45+0.0250 14±0.0215 48.8 2-M10 45P
48 48 + 0.0250 12 + 0.075 + 0.032 51.5 2–M8 48H 48 + 0.0250 14 + 0.0430 51.8 2-M10 48J 48 + 0.0250 14±0.0215 51.8 2-M10 48P
50 50 + 0.0250 12 + 0.075 + 0.032 53.5 2–M8 50H 50 + 0.0250 14 + 0.0430 53.8 2–M10 50J 50 + 0.0250 14±0.0215 53.8 2-M10 50P
55 55+0.0300 15 + 0.075 + 0.032 60.0 2–M10 55H 55 + 0.0300 16 + 0.0430 59.3 2-M10 55J 55+0.0300 16±0.0215 59.3 2-M10 55P
56 56+0.0300 15 + 0.075 + 0.032 61.0 2–M10 56H 56 + 0.0300 16 + 0.0430 60.3 2-M10 56J 56+0.0300 16±0.0215 60.3 2-M10 56P
60 60 + 0.0300 15 + 0.075 + 0.032 65.0 2–M10 60H 60 + 0.0300 18 + 0.0430 64.4 2–M10 60J 60+0.0300 18±0.0215 64.4 2-M10 60P
Unit [mm]
Compatible with new standard motors
Nominal Bore Diameter Bore Diameter
(d1, d2)		 Keyway width
(W1, W2)		 Keyway depth
(T1, T2)		 Set screw hole
(M)
G7, F7 H9 +0.3
0		 －
14N 14+0.024+0.006 5 + 0.0300 16.3 2–M4
19N 19 + 0.028 + 0.007 6 + 0.0300 21.8 2-M5
24N 24 + 0.028 + 0.007 8 + 0.0360 27.3 2-M6
28N 28 + 0.028 + 0.007 8 + 0.0360 31.3 2–M6
38N 38 + 0.050 + 0.025 10 + 0.0360 41.3 2-M8
42N 42 + 0.050 + 0.025 12 + 0.0430 45.3 2-M8
48N 48 + 0.050 + 0.025 14 + 0.0430 51.8 2-M10
55N 55 + 0.060 + 0.030 16 + 0.0430 59.3 2–M10
60N 60 + 0.060 + 0.030 18 + 0.0430 64.4 2-M10

[Location of the set screw]

Model Distance from the end face of the set screw [mm]
SFU-070 7
SFU-080 8
SFU-090 9
SFU-100 12
SFU-120 12
SFU-140 15
  • The set screw and keyway are not located on the same plane. *The set screw is included with the product.
  • The positional accuracy of keyway machining is determined by visual inspection. *Please contact us if you require specific positional accuracy for each keyway relative to the hub.