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Servo Couplings

Pacific International Bearing Sales offers a comprehensive selection of Ruland servo couplings engineered for precision motion control applications. Available in rigid, beam, bellows, curved jaw, disc, and Oldham styles, these zero-backlash couplings are designed to address key performance factors such as shaft misalignment, torque, speed, and space constraints. With a wide range of sizes and materials, users can find the ideal coupling to meet their specific application needs. All Ruland servo couplings are proudly manufactured in Marlborough, MA for consistent quality and reliability.

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Brand

Ruland (9000)

Note

Stainless steel hubs are available upon request. (3362)

Length (L)

0.661 in (12)

0.661 in (16.8 mm) (20)

0.719 in (18.3 mm) (28)

0.778 in (12)

0.778 in (19.8 mm) (22)

0.787 in (6)

0.787 in (20.0 mm) (71)

0.846 in (9)

0.846 in (21.5 mm) (33)

0.866 in (22.0 mm) (30)

0.906 in (23.0 mm) (36)

0.925 in (6)

0.925 in (23.5 mm) (22)

0.937 in (23.8 mm) (44)

0.945 in (24.0 mm) (56)

1.000 in (25.4 mm) (40)

1.016 in (12)

1.016 in (25.8 mm) (45)

1.024 in (9)

1.024 in (26.0 mm) (33)

1.031 in (26.2 mm) (122)

1.076 in (27.3 mm) (28)

1.102 in (28.0 mm) (28)

1.181 in (30.0 mm) (112)

1.189 in (30.2 mm) (52)

1.250 in (31.8 mm) (112)

1.306 in (33.2 mm) (36)

1.313 in (33.3 mm) (181)

1.339 in (12)

1.339 in (34.0 mm) (45)

1.345 in (34.2 mm) (124)

1.355 in (34.4 mm) (36)

1.374 in (34.9 mm) (143)

1.496 in (38.0 mm) (56)

1.500 in (38.1 mm) (220)

1.523 in (38.7 mm) (124)

1.563 in (39.7 mm) (240)

1.700 in (43.2 mm) (181)

1.750 in (44.5 mm) (264)

1.770 in (45.0 mm) (212)

1.813 in (46.1 mm) (302)

1.962 in (49.8 mm) (181)

2.035 in (51.7 mm) (240)

2.165 in (55.0 mm) (271)

2.250 in (57.2 mm) (478)

2.313 in (58.8 mm) (400)

2.316 in (58.8 mm) (240)

2.413 in (61.3 mm) (307)

2.519 in (64.0 mm) (338)

3.080 in (78.2 mm) (449)

3.235 in (82.2 mm) (420)

3.431 in (87.1 mm) (136)

3.439 in (87.4 mm) (136)

3.531 in (89.7 mm) (272)

3.808 in (96.7 mm) (136)

3.816 in (96.9 mm) (136)

3.938 in (100.0 mm) (272)

9.4 mm (6)

11.7 mm (6)

12.5 mm (6)

14.5 mm (6)

16.8 mm (20)

19.8 mm (36)

20.0 mm (20)

21.5 mm (49)

23.5 mm (36)

25.8 mm (64)

26.0 mm (49)

34.0 mm (64)

O.D. (D)

0.375 in (9.5 mm) (12)

0.500 in (12.7 mm) (26)

0.512 in (24)

0.512 in (13.0 mm) (40)

0.590 in (15.0 mm) (160)

0.625 in (15.9 mm) (124)

0.630 in (12)

0.630 in (16.0 mm) (44)

0.750 in (19.1 mm) (416)

0.787 in (18)

0.787 in (20.0 mm) (115)

0.875 in (22.2 mm) (112)

0.984 in (24)

0.984 in (25.0 mm) (202)

1.000 in (25.4 mm) (877)

1.125 in (28.6 mm) (264)

1.181 in (30.0 mm) (112)

1.250 in (31.8 mm) (528)

1.313 in (33.3 mm) (755)

1.500 in (38.1 mm) (478)

1.625 in (41.3 mm) (991)

2.000 in (50.8 mm) (947)

2.250 in (57.2 mm) (1269)

2.750 in (69.9 mm) (544)

3.125 in (79.4 mm) (544)

6 mm (12)

8 mm (12)

13 mm (40)

16 mm (72)

20 mm (98)

25 mm (128)

Material

Aluminum (7751)

303 Stainless Steel (1249)

Bore (B1)

0.0938 in (8)

0.1250 in (51)

0.1563 in (24)

0.1875 in (126)

0.2500 in (239)

0.3125 in (190)

0.3750 in (276)

0.5000 in (363)

0.6250 in (257)

0.7500 in (274)

0.8750 in (180)

1.0000 in (238)

1.1250 in (160)

1.2500 in (189)

1.3750 in (84)

1.5 mm (2)

1.5000 in (108)

1.6250 in (52)

1.7500 in (60)

2 mm (6)

3 mm (48)

4 mm (92)

5 mm (176)

6 mm (198)

7 mm (188)

8 mm (311)

9 mm (245)

10 mm (366)

11 mm (308)

12 mm (372)

13 mm (160)

14 mm (216)

15 mm (252)

16 mm (294)

17 mm (194)

18 mm (218)

19 mm (238)

20 mm (303)

21 mm (1)

22 mm (156)

24 mm (188)

25 mm (219)

28 mm (140)

30 mm (174)

32 mm (156)

35 mm (92)

38 mm (100)

40 mm (48)

42 mm (56)

45 mm (64)

Bore (B2)

0.0938 in (20)

0.1250 in (113)

0.1563 in (40)

0.1875 in (204)

0.2500 in (354)

0.3125 in (352)

0.3750 in (395)

0.5000 in (418)

0.6250 in (271)

0.7500 in (205)

0.8750 in (134)

1.0000 in (144)

1.1250 in (108)

1.2500 in (79)

1.3750 in (52)

1.5 mm (6)

1.5000 in (28)

1.6250 in (16)

1.7500 in (8)

2 mm (10)

3 mm (161)

4 mm (186)

5 mm (199)

6 mm (420)

7 mm (290)

8 mm (360)

9 mm (285)

10 mm (349)

11 mm (276)

12 mm (346)

13 mm (232)

14 mm (340)

15 mm (303)

16 mm (239)

17 mm (198)

18 mm (176)

19 mm (155)

20 mm (176)

22 mm (144)

24 mm (112)

25 mm (163)

28 mm (120)

30 mm (93)

32 mm (64)

35 mm (44)

38 mm (36)

40 mm (20)

42 mm (12)

45 mm (4)

Keyway

No (5120)

Yes (2660)

B1 Max Shaft Penetration

0.265 in (4)

0.265 in (6.7 mm) (4)

0.276 in (24)

0.276 in (7.0 mm) (40)

0.311 in (12)

0.311 in (7.9 mm) (44)

0.339 in (18)

0.339 in (8.6 mm) (66)

0.354 in (6)

0.354 in (9.0 mm) (12)

0.356 in (12)

0.356 in (9.0 mm) (8)

0.377 in (24)

0.377 in (9.6 mm) (36)

0.378 in (24)

0.378 in (9.6 mm) (117)

0.417 in (10.6 mm) (18)

0.422 in (40)

0.422 in (10.7 mm) (64)

0.442 in (6)

0.442 in (11.2 mm) (15)

0.458 in (12)

0.458 in (11.6 mm) (12)

0.461 in (11.7 mm) (26)

0.467 in (20)

0.467 in (11.8 mm) (40)

0.483 in (11)

0.483 in (12.3 mm) (15)

0.499 in (33)

0.499 in (12.7 mm) (80)

0.517 in (6)

0.517 in (13.1 mm) (12)

0.535 in (13.6 mm) (16)

0.559 in (14.2 mm) (52)

0.570 in (12)

0.570 in (14.5 mm) (30)

0.573 in (12)

0.573 in (14.6 mm) (15)

0.579 in (24)

0.579 in (14.7 mm) (60)

0.590 in (20)

0.590 in (15.0 mm) (48)

0.607 in (12)

0.607 in (15.4 mm) (24)

0.626 in (17)

0.626 in (15.9 mm) (52)

0.635 in (11)

0.654 in (15)

0.654 in (6.6 mm) (32)

0.695 in (80)

0.695 in (17.6 mm) (224)

0.715 in (17)

0.715 in (18.2 mm) (52)

0.717 in (18.2 mm) (26)

0.720 in (12)

0.720 in (18.3 mm) (42)

0.755 in (20)

0.755 in (19.2 mm) (88)

0.804 in (19)

0.804 in (20.4 mm) (72)

0.842 in (29)

0.842 in (21.4 mm) (144)

0.874 in (30)

0.874 in (22.2 mm) (120)

0.935 in (19)

0.935 in (23.7 mm) (72)

0.946 in (40)

0.946 in (24.0 mm) (176)

1.029 in (30)

1.029 in (26.1 mm) (88)

1.050 in (35)

1.050 in (26.7 mm) (97)

1.075 in (20)

1.075 in (27.3 mm) (88)

1.085 in (42)

1.085 in (27.6 mm) (132)

1.099 in (30)

1.099 in (27.9 mm) (120)

1.192 in (45)

1.192 in (30.3 mm) (120)

1.200 in (14)

1.200 in (30.5 mm) (30)

1.400 in (14)

1.400 in (35.56 mm) (30)

1.458 in (63)

1.458 in (37.0 mm) (121)

1.496 in (56)

1.496 in (38.0 mm) (182)

1.582 in (56)

1.582 in (40.2 mm) (126)

1.650 in (42)

1.650 in (41.9 mm) (96)

1.750 in (56)

1.750 in (44.5 mm) (126)

1.843 in (42)

1.843 in (46.8 mm) (96)

4.8 mm (12)

5.2 mm (12)

6.7 mm (4)

7.0 mm (40)

7.9 mm (72)

8.6 mm (98)

9.0 mm (16)

9.6 mm (176)

10.6 mm (12)

10.7 mm (40)

11.2 mm (15)

11.6 mm (20)

11.7 mm (30)

11.8 mm (32)

12.3 mm (12)

12.7 mm (79)

13.1 mm (10)

13.6 mm (12)

14.2 mm (60)

14.5 mm (30)

14.6 mm (25)

14.7 mm (60)

15.0 mm (49)

15.4 mm (20)

15.9 mm (55)

16.1 mm (72)

16.6 mm (46)

17.6 mm (224)

18.2 mm (85)

18.3 mm (56)

19.2 mm (132)

20.4 mm (90)

21.4 mm (152)

22.2 mm (152)

23.7 mm (90)

24.0 mm (264)

26.1 mm (153)

26.7 mm (80)

27.3 mm (130)

27.6 mm (132)

27.9 mm (157)

30.3 mm (173)

30.5 mm (18)

35.56 mm (18)

37.0 mm (147)

38.0 mm (182)

40.2 mm (90)

41.9 mm (72)

44.5 mm (90)

46.8 mm (72)

B2 Max Shaft Penetration

0.265 in (4)

0.265 in (6.7 mm) (4)

0.276 in (24)

0.276 in (7.0 mm) (40)

0.311 in (12)

0.311 in (7.9 mm) (44)

0.339 in (18)

0.339 in (8.6 mm) (66)

0.354 in (6)

0.354 in (9.0 mm) (12)

0.356 in (12)

0.356 in (9.0 mm) (8)

0.377 in (24)

0.377 in (9.6 mm) (36)

0.378 in (24)

0.378 in (9.6 mm) (117)

0.417 in (10.6 mm) (18)

0.422 in (40)

0.422 in (10.7 mm) (64)

0.442 in (6)

0.442 in (11.2 mm) (15)

0.458 in (12)

0.458 in (11.6 mm) (12)

0.461 in (11.7 mm) (26)

0.467 in (5)

0.467 in (11.8 mm) (5)

0.483 in (11)

0.483 in (12.3 mm) (15)

0.499 in (39)

0.499 in (12.7 mm) (98)

0.517 in (6)

0.517 in (13.1 mm) (12)

0.535 in (13.6 mm) (16)

0.559 in (14.2 mm) (52)

0.570 in (12)

0.570 in (14.5 mm) (30)

0.573 in (12)

0.573 in (14.6 mm) (15)

0.579 in (24)

0.579 in (14.7 mm) (60)

0.590 in (5)

0.607 in (12)

0.607 in (15.4 mm) (24)

0.626 in (17)

0.626 in (15.9 mm) (52)

0.635 in (17)

0.654 in (24)

0.654 in (16.6 mm) (49)

0.695 in (80)

0.695 in (17.6 mm) (224)

0.715 in (17)

0.715 in (18.2 mm) (52)

0.717 in (18.2 mm) (26)

0.720 in (12)

0.720 in (18.3 mm) (42)

0.755 in (20)

0.755 in (19.2 mm) (88)

0.804 in (19)

0.804 in (20.4 mm) (72)

0.842 in (38)

0.842 in (21.4 mm) (188)

0.874 in (30)

0.874 in (22.2 mm) (120)

0.935 in (19)

0.935 in (23.7 mm) (72)

0.946 in (40)

0.946 in (24.0 mm) (176)

1.029 in (30)

1.029 in (26.1 mm) (88)

1.050 in (5)

1.050 in (26.7 mm) (6)

1.075 in (20)

1.075 in (27.3 mm) (88)

1.085 in (54)

1.085 in (27.6 mm) (172)

1.099 in (30)

1.099 in (27.9 mm) (120)

1.192 in (45)

1.192 in (30.3 mm) (120)

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1.400 in (2)

1.400 in (35.56 mm) (10)

1.458 in (81)

1.458 in (37.0 mm) (172)

1.496 in (56)

1.496 in (38.0 mm) (182)

1.582 in (56)

1.582 in (40.2 mm) (126)

1.650 in (54)

1.650 in (41.9 mm) (124)

1.750 in (56)

1.750 in (44.5 mm) (126)

1.843 in (54)

1.843 in (46.8 mm) (116)

4.8 mm (12)

5.2 mm (12)

6.7 mm (4)

7.0 mm (40)

7.9 mm (72)

8.6 mm (98)

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9.6 mm (176)

10.6 mm (12)

10.7 mm (40)

11.2 mm (15)

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12.3 mm (12)

12.7 mm (91)

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14.2 mm (60)

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14.7 mm (60)

15.0 mm (12)

15.4 mm (20)

15.9 mm (55)

16.1 mm (88)

16.6 mm (61)

17.6 mm (224)

18.2 mm (85)

18.3 mm (56)

19.2 mm (132)

20.4 mm (90)

21.4 mm (173)

22.2 mm (152)

23.7 mm (90)

24.0 mm (264)

26.1 mm (153)

26.7 mm (9)

27.3 mm (130)

27.6 mm (165)

27.9 mm (157)

30.3 mm (173)

30.5 mm (2)

35.56 mm (2)

37.0 mm (185)

38.0 mm (182)

40.2 mm (90)

41.9 mm (88)

44.5 mm (90)

46.8 mm (88)

2993 (4)

Bore Tolerance

+0.001 in / -0.000 in (1130)

+0.001 in / -0.000 in (+0.020 mm / -0.000 mm) (240)

+0.001 in / -0.000 in (+0.025 mm / -0.000 mm) (826)

+0.001 in / -0.000 in (+0.03 mm / -0.00 mm) (2340)

+0.004 in / +0.001 in (56)

+0.010 mm / -0.000 mm (24)

+0.020 mm / +0.000 mm (338)

+0.025 mm / -0.000 mm (856)

+0.03 mm / -0.00 mm (2650)

Screw Material

Alloy Steel (7770)

Stainless Steel (10)

18-8 300 Series Stainless Steel (680)

Screw Finish

Black Oxide (7780)

Bright (680)

Forged Clamp Screw

M2 (72)

M2.5 (88)

M3 (658)

M4 (511)

M5 (639)

M6 (850)

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Bellows Coupling Standard Length (2156)

F-Series Six Beam Coupling (574)

P-Series 4 Beam Couplings Clamp (526)

P-Series 4 Beam Couplings Set Screw (524)

4 Beam Couplings Clamp (170)

4 Beam Couplings Set Screw (163)

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1/4 in (282)

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2 mm (36)

3 mm (95)

3/16 in (318)

3/32 in (48)

3/8 in (110)

4 mm (159)

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6 mm (410)

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10 mm (154)

12 mm (52)

14 mm (32)

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NK (136)

1/4 in (159)

1/8 in (178)

2 mm (108)

3 mm (175)

3/16 in (279)

3/32 in (120)

3/8 in (26)

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5 mm (587)

5/16 in (26)

6 mm (310)

8 mm (238)

10 mm (71)

12 mm (16)

14 mm (2)

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Bore (B2): high to low
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750

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15 items added to cart, can be ordered and shipped today.
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Brand

Note

Length (L)

O.D. (D)

Material

Bore (B1)

Bore (B2)

Keyway

B1 Max Shaft Penetration

B2 Max Shaft Penetration

Bore Tolerance

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Screw Finish

Forged Clamp Screw

ISO 9001:2015

REACH

RoHS3

Conflict Minerals

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Product Group

Keyway (K1)

Keyway (K2)

Bore (B1)

Bore (B2)

O.D. (D)

Length (L)

Product

Files

Price

MDCSK41-20-19-A

$138.74 / each

MDCSK41-20-12-A

$138.74 / each

MDCSK41-20-20-A

$138.74 / each

MDCSK41-20-13-A

$138.74 / each

MDCSK41-20-14-A

$138.74 / each

MDCSK41-20-15-A

$138.74 / each

MDCSK41-20-16-A

$138.74 / each

MDCSK41-20-17-A

$138.74 / each

MDCSK51-20-15-A

$174.72 / each

MDCSK51-20-12-A

$174.72 / each

MDCSK51-20-16-A

$174.72 / each

MDCSK51-20-13-A

$174.72 / each

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