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Jaw Coupling
SJC Series

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

SJC Series

Go to SJC Series(Index)

Jaw Coupling

Shaft-insertion

Features of SJC-I Series
  • Easy attachment to various hub types e.g. Pulleys, Gears, Sprockets, or Hollow shafts
  • Space-saving design
  • Simple clamping methods by tightening a single bolt
  • Self-centering function by the taper structure
  • Various types of coupling hubs (e.g. Side-clamp, Set-screw) can be combined
Principles
  • Bushing and Insert hub are tightly coupled by the thrust of fastening screws.
  • And then the insert part gets spread outward due to the taper structure and clamped into the inner diameter on the other side.
Dimensions
Model Coupling hub OD Shaft-insertion hub OD
SJC-25I□ 25mm 10mm
SJC□-30I□ 30mm 12mm
SJC□-40I□ 40mm 20mm
SJC-55I□ 55mm 25mm
SJC-65I□ 65mm 35mm

※ OD: Outer Diameter

※ Please contact Sung-il Customer Service team for non-standard Inserted hub OD products.

How to Disassemble
There is a Screw for Disassemble at the bottom of the Tapped-hole for disassembly.

① Please refer to the below table.

Model Fastening screw Screw for disassembly
SJC-25I M3 M4
SJC-30I M4 M5
SJC-40I M6 M8
SJC-55I M8 M10
SJC-65I M10 M12

② After removing fastening screws, insert a screw for disassembly and fasten it into the tapped-hole for disassembly. And then, bushing comes out being disassembled by thrust of the screw.

How to Order
How to Order(Shaft-insertion)
  • SJC – 2D (.dwg)
  • SJC – 3D (.step)

Shaft-insertion x Side-clamp

Dimensions / Performance
Model CAD Size (±0.3mm) Screw Screw
(Shaft-
insertion)
Permissible
Torque
(N·m)
Max.
rpm
(min-1)
Moment
of
Inertia
(kg·m2)
Static
Torsional
Stiffness
(N·m/rad)
Mass
(g)
Permissible Misalignment Side-
clamp
Hub
Split
(W)
D L L1 L3 F L2 D2 Size(M) Fastening
Torque
(N·m)
Size(M2) Fastening
Torque
(N·m)
Angular
(˚)
Parallel
(mm)
End-
play
(mm)
SJC-25IC-BL 25 41.2 10 - 5 15.5 10 M3 1.7 M3 1.2 7 13,000 4.7×10-6 220 30 1 0.07 -0.4 ~ +1.0 X
SJC-25IC-GR 25 41.2 10 - 5 15.5 10 M3 1.7 M3 1.2 7 13,000 4.7×10-6 260 30 1 0.07 -0.4 ~ +1.0 X
SJC-25IC-RD 25 41.2 10 - 5 15.5 10 M3 1.7 M3 1.2 7 13,000 4.7×10-6 300 30 1 0.05 -0.4 ~ +1.0 X
SJCA-30IC-BL 30 42.8 11.3 - 5.6 15.5 12 M4 3.5 M4 2.5 7.5 10,000 9.3×10-6 170 46 1 0.08 -0.4 ~ +1.0 X
SJCA-30IC-GR 30 42.8 11.3 - 5.6 15.5 12 M4 3.5 M4 2.5 7.5 10,000 9.3×10-6 200 46 1 0.08 -0.4 ~ +1.0 X
SJCA-30IC-RD 30 42.8 11.3 - 5.6 15.5 12 M4 3.5 M4 2.5 7.5 10,000 9.3×10-6 220 46 1 0.06 -0.4 ~ +1.0 X
SJCB-30IC-BL 30 47.5 16 11.1 5.4 15.5 12 M4 3.5 M4 2.5 7.5 10,000 1.2×10-5 170 52 1 0.08 -0.4 ~ +1.0
SJCB-30IC-GR 30 47.5 16 11.1 5.4 15.5 12 M4 3.5 M4 2.5 7.5 10,000 1.2×10-5 200 52 1 0.08 -0.4 ~ +1.0
SJCB-30IC-RD 30 47.5 16 11.1 5.4 15.5 12 M4 3.5 M4 2.5 7.5 10,000 1.2×10-5 220 52 1 0.06 -0.4 ~ +1.0
SJCA-40IC-BL 40 63.5 19.5 13.6 6.8 21 20 M5 8 M6 10 35 8,500 5.6×10-5 1,500 136 1 0.06 -0.5 ~ +1.2
SJCA-40IC-GR 40 63.5 19.5 13.6 6.8 21 20 M5 8 M6 10 35 8,500 5.6×10-5 1,600 136 1 0.06 -0.5 ~ +1.2
SJCA-40IC-RD 40 63.5 19.5 13.6 6.8 21 20 M5 8 M6 10 35 8,500 5.6×10-5 1,750 136 1 0.04 -0.5 ~ +1.2
SJCB-40IC-BL 40 69 25 16.5 8.4 21 20 M5 8 M6 10 35 8,500 7.4×10-5 1,500 151 1 0.06 -0.5 ~ +1.2
SJCB-40IC-GR 40 69 25 16.5 8.4 21 20 M5 8 M6 10 35 8,500 7.4×10-5 1,600 151 1 0.06 -0.5 ~ +1.2
SJCB-40IC-RD 40 69 25 16.5 8.4 21 20 M5 8 M6 10 35 8,500 7.4×10-5 1,750 151 1 0.04 -0.5 ~ +1.2
SJC-55IC-BL 55 86.3 30.3 21 10.5 31 25 M6 13 M8 20 80 6,500 1.2×10-4 3,000 310 1 0.09 -0.5 ~ +1.4
SJC-55IC-GR 55 86.3 30.3 21 10.5 31 25 M6 13 M8 20 80 6,500 1.2×10-4 4,500 310 1 0.09 -0.5 ~ +1.4
SJC-55IC-RD 55 86.3 30.3 21 10.5 31 25 M6 13 M8 20 80 6,500 1.2×10-4 6,000 310 1 0.06 -0.5 ~ +1.4
SJC-65IC-BL 65 99.3 35.3 25.6 12.5 37 35 M8 30 M10 40 180 5,500 1.7×10-4 6,500 400 1 0.1 -0.6 ~ +1.5
SJC-65IC-GR 65 99.3 35.3 25.6 12.5 37 35 M8 30 M10 40 180 5,500 1.7×10-4 8,500 400 1 0.1 -0.6 ~ +1.5
SJC-65IC-RD 65 99.3 35.3 25.6 12.5 37 35 M8 30 M10 40 180 5,500 1.7×10-4 10,000 400 1 0.08 -0.6 ~ +1.5
  • The Moment of Inertia and Mass values are based on products with max. Inner diameter.
  • Please modify rated/max. torque value with temperature correction factor when it’s higher than 30°C.
  • It’s not allowed to have other complementary options to enhance clamping force such as keyway etc. on the shaft-insertion hub. This is the reason why the above-mentioned permissible torques are based on the slip torque on the shaft-insertion hub.
  • Please contact Sung-il Customer Service team for non-standard Inserted hub OD(D2) products.
  • Please refer to previous pages for the standard ID range of Side-clamp hubs.
  • It’s also possible to assemble with space-saving side-clamp, set-screw and taper-ring hubs.