SJC Series(Jaw Coupling) | Coupling product line, Support unit for Ball screw, Connecting shaft, A.P. LOCK (Keyless Bushing), Safety Coupling etc.

Taper-ring

When inner screws are fastened, the inner ring and outer ring move closer each other by the thrust of screws and the taper ring structure.
The inner ring shrinks evenly and gives contact pressure on shafts and then the shaft and the coupling are tightly interlocked.
Perfect symmetry for the rotating shafts.

Example) Comparison between 2 products with the identical OD (55mm) and different clamping methods shows the results as below.

Model name	Clamping Methods	Unbalance (g-mm)
SJC-55T	Taper-ring	0.7
SJC-55C	Side-clamp	21.6

Unbalance is the main reason that causes noise and vibration on high speed rotating applications
The Taper type product has the structure of complete symmetry which leads to nearly zero-unbalance

※ The above values may be subject to change based on test conditions (e.g. shaft material or tolerance)

Step 1. Firstly remove dust or oil substances from the surface where outer and inner ring hubs face each other as well as the surface of the inserting shaft.
Step 2. Spread oil thinly on the surface where outer and inner ring hubs face each other as well as the surface of the inserting shaft. (Any oil type which includes molybdenum-sulfur compounds or silicone is prohibited)
Step 3. Insert the shaft up to L₂ of the inner ring hub.
Step 4. Fasten the screws with ½ of fastening torque one time each in sequential order as shown on the below Fig.(1)
Step 5. Fasten the screws with full of fastening torque one time each in sequential order as shown on the below Fig.(1)
Step 6. Fasten the screws with full of fastening torque in sequential order as shown on the below Fig.(2). Repeat Step 6 until all screws are fastened appropriately.

※ Please refer to “Dimensions / Performance” tables
for fastening torques.

Taper-ring

Model	CAD	Size (±0.3mm)			Screw		Rated Torque (N·m)	Max. Torque (N·m)	Max. rpm (min^-1)	Moment of Inertia (kg·m²)	Static Torsional Stiffness (N·m/rad)	Mass (g)	Permissible Misalignment
Model	CAD	D	L	L₁	Size	Fastening Torque (N·m)	Rated Torque (N·m)	Max. Torque (N·m)	Max. rpm (min^-1)	Moment of Inertia (kg·m²)	Static Torsional Stiffness (N·m/rad)	Mass (g)	Angular (˚)	Parallel (mm)	End- play (mm)
SJC-55T-BL		55	78	30.3	M5	8	60	120	12,000	1.59 x 10^-4	3,000	345	1	0.09	-0.5 ~ +1.4
SJC-55T-GR		55	78	30.3	M5	8	60	120	12,000	1.59 x 10^-4	4,500	345	1	0.09	-0.5 ~ +1.4
SJC-55T-RD		55	78	30.3	M5	8	75	150	12,000	1.59 x 10^-4	6,000	345	1	0.06	-0.5 ~ +1.4
SJC-65T-BL		65	90.3	35.3	M5	8	150	300	10,000	3.75 x 10^-4	6,500	536	1	0.1	-0.6 ~ +1.5
SJC-65T-GR		65	90.3	35.3	M5	8	150	300	10,000	3.75 x 10^-4	8,500	536	1	0.1	-0.6 ~ +1.5
SJC-65T-RD		65	90.3	35.3	M5	8	180	360	10,000	3.75 x 10^-4	10,000	536	1	0.08	-0.6 ~ +1.5
SJC-80T-BL		80	114.2	45.2	M6	13	300	600	8,000	1.09 x 10^-3	8,000	1,043	1	0.1	-0.6 ~ +1.5
SJC-80T-GR		80	114.2	45.2	M6	13	300	600	8,000	1.09 x 10^-3	12,000	1,043	1	0.1	-0.6 ~ +1.5
SJC-80T-RD		80	114.2	45.2	M6	13	380	760	8,000	1.09 x 10^-3	14,000	1,043	1	0.08	-0.6 ~ +1.5
SJC-100T-BL		104	140.2	56	M10	50	500	1,000	6,500	3.70 x 10^-3	24,000	2,126	1	0.15	-0.6 ~ +2.0
SJC-100T-GR		104	140.2	56	M10	50	500	1,000	6,500	3.70 x 10^-3	30,000	2,126	1	0.15	-0.6 ~ +2.0
SJC-100T-RD		104	140.2	56	M10	50	600	1,200	6,500	3.70 x 10^-3	40,000	2,126	1	0.1	-0.6 ~ +2.0

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 30ºC.
Max. torque/rated torque is the value regarding to a coupling’s self-durability and is not related to slip-torque between the coupling bore and the shaft.

Model	Standard Inner Diameter (d₁, d₂) (mm)
Model	12	14	15	16	18	19	20	22	24	25	26	28	30	32	35	40	45	50	55
SJC-55T	●	●	●	●	●	●	●	●	●	●	●	●
SJC-65T			●	●	●	●	●	●	●	●	●	●	●	●	●
SJC-80T			●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
SJC-100T							●	●	●	●	●	●	●	●	●	●	●	●	●

The recommended shaft tolerance is h7.
Custom process (e.g. non-standard Inner diameter, special tolerance etc.) is also available upon a special request in prior to order placement.
Keyway is NOT available

The below table shows the actual permissible torque values when the slip torque value is lower than the coupling’s max. torque value.
If the slip torque value is lower than the coupling’s max. torque value, please check and compare between the slip torque in the below table and the operating torque value of the connected motor. It is safer to size up the coupling or use a key/keyway when the slip torque value is lower than the motor’s operating torque.
The below slip torque values may be subject to change according to different testing conditions. (e.g. shaft tolerance, surface roughness, surface treatment or acceleration/deceleration of driving shafts). On the other hand, the values could be affected when a different kind of fastening screw is used (body material or surface treatment). Therefore, we recommend you test under the same conditions before mounting.

Model	Max. Torque (N·m) RD Sleeve	Slip Torque (N·m) by Inner Diameter (d₁, d₂)
Model	Max. Torque (N·m) RD Sleeve	12	14	15	16	18	19	20	22	24	25	26	28	30	32	35	40	45	50	55
SJC-55T	150	65	65	80	80	100	105	125	125	125	130
SJC-65T	360			100	110	120	130	150	200	240	250	260	270	280	290	300
SJC-80T	760			150	160	180	190	210	330	350	380	400	450	540	540	580	600	620
SJC-100T	1200							420	450	480	500	530	590	650	700	700	700	700	700	700

Jaw CouplingSJC Series