Jaw Coupling
SJC Series

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  • Why Couplings?
  • Installation Guide
  • Selection Guide
  • Customer-friendly Services
  • Environmental Compliance
  • Made-To-Order Process
  • Varieties for Special Environments
  • Balancing Correction

SJC Seriesdownload

Jaw Coupling

  • Power transmission through the spider (sleeve) in the middle
  • The highest durability comparing to other coupling series
  • Various clamping methods available
  • High precision with preloaded assembly
Set-screw Size : 14 ~ 100View more >
Structure Material Surface Treatment
Hub High Strength Aluminum Alloy Anodizing
Sleeve Hytrel®(RD/GR)
TPU (BL)
-
Fastening Screw SCM435 Black Oxide
Side-clamp (Space-saving) Size : M-55C ~ M-100CView more >
Structure Material Surface Treatment
Hub High Strength Aluminum Alloy Anodizing
Sleeve Hytrel®(RD/GR)
TPU (BL)
Fastening Screw SCM435 Black Oxide
Side-clamp Size : 14C ~ 100CView more >
Structure Material Surface Treatment
Hub High Strength Aluminum Alloy Anodizing
Sleeve Hytrel®(RD/GR)
TPU (BL)
-
Fastening Screw SCM435 Black Oxide
Side-clamp Size : 120C ~ 160CView more >
Structure Material Surface Treatment
Hub Steel Electroless Nickel Plating
Sleeve Hytrel®(RD/GR) -
Fastening Screw SCM435 Electroless Nickel Plating
Taper-ring Size : 55T ~ 100TView more >
Structure Material Surface Treatment
Hub High Strength Aluminum Alloy Anodizing
Sleeve Hytrel®(RD/GR)
TPU (BL)
-
Fastening Screw SCM435 Black Oxide
Shaft-insertion Size : 25I ~ 65IView more >
Structure Material Surface Treatment
Hub High Strength Aluminum Alloy Anodizing
Sleeve Hytrel®(RD/GR)
TPU (BL)
-
Bushing Stainless Steel
Fastening Screw SCM435 Black Oxide
How to Order(Set-screw / Side-clamp / Taper-ring)
① Clamping Methods
No mark
Set-screw
C
General Side-clamp
CW
Side-clamp Hub Split
T
Taper-ring
② Sleeve Type (Shore Stiffness)
RD
Hytrel, Sh63D
GR
Hytrel, Sh98A
BL
TPU, Sh98A
③ Center-Through
No mark
Center-Solid
TH
Center-Through
④ Side-clamp Hub Split
No mark
Not Split
W
Split (Only applicable on Side-clamp Type)
⑤ Keyway
No mark
No Keyway
K(b size)
Keyway processed according to the indicated b size.
(Keyway is not applicable on Taper-ring type)

※ HOW TO ORDER(Shaft-insertion) : View more >

Side-clamp Hub Split(W) Option is available
  • From certain outer diameter (OD) sizes, we can provide Side-clamp Hub Split products. Please refer to “HOW TO ORDER” page for more details.
Product Features & Application
Sleeve Material Hytrel (RD/GR) TPU (BL)
Backlash free (Precision)
High Torque (Durability)
Torsional Stiffness
Vibration Absorption
Misalignment Absorption
Insulation of Electric Current
Applicable Motors Servo
Stepping
Encoder
General
Permissible Temperature -20℃ ~ 120℃ -20℃ ~ 70℃

Application : Machine tools, Press machine, Injection Molding machine, Pneumatic machine, Pump, Cartesian Robot, Belt Drive, Logistics facilities etc.

Clamping Methods
Set-screw
(No mark)
General
With Keyway
Side-clamp (C) General
Hub Split
With Keyway
Shaft-insertion (I)
Taper-ring (T)

※ △ symbol in the above table means that the availability is subject to differ according to each outer diameter size.

※ You may check more details on the “Dimensions / Performance” tables in the following pages.

Sleeve Material
  • A Sleeve (Spider) is the medium that transmits motion absorbing impact and misalignment and it is the core part of Jaw couplings.
  • Hytrel®(made by Dupont) is superior in terms of mechanical strength, abrasion resistance and heat resistance whereas TPU (Thermoplastic polyurethane) has higher damping capacity.
  • According to material and shore stiffness, there are 3 types of sleeves, RD(Hytrel, Sh 63D), GR(Hytrel, Sh 98A) and BL(TPU, Sh 98A) respectively.
Sleeve Types (General: Center-Solid / TH: Center-Through)

If the shaft has to be inserted deeper than L1 value, we can provide appropriate center-through sleeves. Please refer to “HOW TO ORDER” in the previous page. Either type has the identical value of transmittable torque and the same level of misalignment absorption.

Type 14 - 30 40 48 - 100 120 - 135 160
General : Center-Solid - -
TH : Center-Through
Center-Through Sleeve Bore Size
Model Max. standard ID Sleeve-TH ID
SJC-14 Φ5 -
SJC-20 Φ8 Φ6
SJC-25 Φ10 Φ6.35
SJC-30 Φ14 Φ8
SJC-40 Φ18 Φ15
SJC-48 Φ28 Φ20
SJC-55 Φ28 Φ25
SJC-65 Φ35 Φ25
SJC-80 Φ45 Φ32
SJC-90 Φ50 Φ40
SJC-100 Φ60 Φ45
SJC-120 Φ65 Φ55
SJC-135 Φ70 Φ65
SJC-160 Φ80 Φ75
Preload on Sleeves

Sung-il’s SJC Series is assembled with adequate preload and its outstanding features are as below.

  1. Improved static torsional stiffness brings faster response
  2. Minimized backlash as there is no clearance at the assembled area
Model Distance S Model Distance S Model Distance S
SJC-14 1.0mm SJC-40, 48, 55 2mm SJC-100 3.5mm
SJC-20 1.0mm SJC-65 2.5mm SJC-120 4mm
SJC-25 1.2mm SJC-80 3mm SJC-135 4.5mm
SJC-30 1.5mm SJC-90 3mm SJC-160 5mm
Performance table according to sleeve types
Model Code Material Shore
Stiffness
Rated
Torque
(N·m)
Max.
Torque
(N·m)
Static
Torsional
Stiffness
(N·m/rad)
Permissible Misalignment
Angular
(˚)
Parallel
(mm)
End-play
(mm)
SJC-14 BL TPU 98A 2 4 22 1 0.05 -0.2 ~ +0.6
GR Hytrel 98A 2 4 25 1 0.05 -0.2 ~ +0.6
RD Hytrel 63D 2.5 5 34 1 0.03 -0.2 ~ +0.6
SJC-20 BL TPU 98A 4 8 50 1 0.07 -0.3 ~ +0.8
GR Hytrel 98A 4 8 60 1 0.07 -0.3 ~ +0.8
RD Hytrel 63D 6 12 74 1 0.05 -0.3 ~ +0.8
SJC-25 BL TPU 98A 9 18 220 1 0.07 -0.4 ~ +1.0
GR Hytrel 98A 9 18 260 1 0.07 -0.4 ~ +1.0
RD Hytrel 63D 12 24 300 1 0.05 -0.4 ~ +1.0
SJC-30 BL TPU 98A 12 24 170 1 0.08 -0.5 ~ +1.0
GR Hytrel 98A 12 24 200 1 0.08 -0.5 ~ +1.0
RD Hytrel 63D 16 32 220 1 0.06 -0.5 ~ +1.0
SJC-40 BL TPU 98A 17 34 1,500 1 0.06 -0.6 ~ +1.2
GR Hytrel 98A 17 34 1,600 1 0.06 -0.6 ~ +1.2
RD Hytrel 63D 21 42 1,750 1 0.04 -0.6 ~ +1.2
SJC-48 BL TPU 98A 35 70 1,800 1 0.08 -0.6 ~ +1.3
GR Hytrel 98A 35 70 2,800 1 0.08 -0.6 ~ +1.3
RD Hytrel 63D 40 80 3,600 1 0.05 -0.6 ~ +1.3
SJC-55 BL TPU 98A 60 120 3,000 1 0.09 -0.6 ~ +1.4
GR Hytrel 98A 60 120 4,500 1 0.09 -0.6 ~ +1.4
RD Hytrel 63D 75 150 6,000 1 0.06 -0.6 ~ +1.4
SJC-65 BL TPU 98A 150 300 6,500 1 0.1 -0.6 ~ +1.5
GR Hytrel 98A 150 300 8,500 1 0.1 -0.6 ~ +1.5
RD Hytrel 63D 180 360 10,000 1 0.08 -0.6 ~ +1.5
SJC-80 BL TPU 98A 300 600 8,000 1 0.1 -0.6 ~ +1.5
GR Hytrel 98A 300 600 12,000 1 0.1 -0.6 ~ +1.5
RD Hytrel 63D 380 760 14,000 1 0.08 -0.6 ~ +1.5
SJC-90 BL TPU 98A 450 900 12,000 1 0.15 -0.6 ~ +2.0
GR Hytrel 98A 450 900 14,000 1 0.15 -0.6 ~ +2.0
RD Hytrel 63D 500 1,000 16,000 1 0.1 -0.6 ~ +2.0
SJC-100 BL TPU 98A 500 1,000 24,000 1 0.15 -0.6 ~ +2.0
GR Hytrel 98A 500 1,000 30,000 1 0.15 -0.6 ~ +2.0
RD Hytrel 63D 600 1,200 40,000 1 0.1 -0.6 ~ +2.0
SJC-120 GR Hytrel 98A 620 1,240 50,000 1.2 0.35 -1.0 ~ +2.2
RD Hytrel 63D 740 1,480 90,000 1.2 0.25 -1.0 ~ +2.2
SJC-135 GR Hytrel 98A 850 1,700 60,000 1.2 0.4 -1.0 ~ +2.2
RD Hytrel 63D 1,050 2,100 100,000 1.2 0.3 -1.0 ~ +2.2
SJC-160 GR Hytrel 98A 1,700 3,400 90,000 1.2 0.4 -1.5 ~ +3.0
RD Hytrel 63D 2,100 4,200 150,000 1.2 0.32 -1.5 ~ +3.0