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Home > Products > Couplings & Power Transmission > S-Flex Couplings

S-Flex Couplings

Easy to Install
Maintenance Free
No Lubrication
Dampens Vibration and Controls Shock
Torsionally Soft
Double Engagement

The simple design of the S–Flex coupling ensures ease of assembly and reliable performance. No special tools are needed for installation or removal. The S–Flex couplings can be used in a wide variety of applications.

The S–Flex coupling design is comprised of three parts. Two flanges with internal teeth engage an elastomeric flexible sleeve with external teeth. Each flange is attached to the respective shaft of the driver and driven and torque is transmitted across the flanges through the sleeve. Misalignment and torsional shock loads are absorbed by shear deflection in the sleeve. The shear characteristic of the S–Flex coupling is very well suited to absorb impact loads.

The S–Flex coupling from Lovejoy offers combinations of flanges and sleeves which can be assembled to suit your specific application. Thirteen sizes are available with torque capabilities that range from 60 in-lbs (6.78 Nm) to 72,480 in-lbs (8189 Nm). The S–Flex flanges are offered in five models which are made from zinc die cast or cast iron. Sleeves are available in EPDM rubber, Neoprene, or Hytrel® to address a wide variety of application requirements.

Digital Parts Catalog (Beta)

Click here to access Lovejoy's Digital Parts Catalog for S-Flex components.

A standard S-Flex coupling is comprised of 3 parts: 2 flanges (J or S Type) and 1 elastomeric sleeve (single piece or split types are available in EPDM, Neoprene, or Hytrel®). Bushing & spacer S-Flex coupling configurations are also available.

Misalignment Capability

S Flex Parallel Couplings Image

PARALLEL: The S–Flex coupling accepts up to .062 inches of parallel misalignment without wear. The flexible coupling sleeve minimizes the radial loads imposed on equipment bearings, a problem commonly associated with parallel misalignment.

S-Flex Axial Couplings Image

AXIAL: The S–Flex couplings can be used in applications which require a limited amount of shaft end-float without transferring thrust loads to equipment bearings. Axial movement of approximately 1/8 inch accepted.

S-Flex Angular Couplings Image

ANGULAR: The flexing action of the elastomeric sleeve and the locking feature of the mating teeth allows the S–Flex coupling to effectively handle angular misalignment up to 1°.

S-Flex Torsional Couplings Image

TORSIONAL: S-Flex couplings effectively dampen torsional shock and vibration to protect connected equipment. The EPDM and Neoprene sleeves have torsional wind-up flexibility of 15° at their rated torque. Hytrel provides 7° wind-up.

Flange Types

J Type – Zinc Die Cast and Cast Iron (Bore Range: .375” to 1.437”)
S Type – Cast Iron (Bore Range: .5” to 5.5”)
B Type – Cast Iron with bushing
SC Type – Cast Iron Spacer
T Type – Cast Iron with Taper-lock bushing

Nominal Rated Torque Data (Standard Catalog)

	ID1-ID2		EPDM			Neoprene			Hytrel®
	Min Bore	Max Bore	Torque		Max	Torque		Max	Torque		Max
Size	(in)	(in)	(in-lbs)	(Nm)	RPM	(in-lbs)	(Nm)	RPM	(in-lbs)	(Nm)	RPM
3	0.38	0.88	60	6.78	9,200	60	6.78	9,200	N/A	N/A	N/A
4	0.50	1.00	120	13.56	7,600	120	13.56	7,600	N/A	N/A	N/A
5	0.50	1.19	240	27.12	7,600	240	27.12	7,600	N/A	N/A	N/A
6	0.63	1.44	450	50.84	6,000	450	50.84	6,000	1,800	203.37	6,000
7	0.63	1.63	725	81.91	5,250	725	81.91	5,250	2,875	324.83	5,250
8	0.75	1.94	1,135	128.24	4,500	1,135	128.24	4,500	4,530	511.82	4,500
9	0.88	2.38	1,800	203.37	3,750	1,800	203.37	3,750	7,200	813.49	3,750
10	1.13	2.75	2,875	324.83	3,600	2,875	324.83	3,600	11,350	1282,38	3,600
11	1.25	3.38	4,530	511.82	3,600	4,530	511.82	3,600	18,000	2033.73	3,600
12	1.50	3.88	7,200	813.49	2,800	7,200	813.49	2,800	31,500	3559.03	2,800
13	2.00	4.50	11,350	1282.38	2,400	11,350	1282.38	2,400	47,268	5340.57	2,400
14	2.00	5.00	18,000	2033.73	2,200	18,000	2033.73	2,200	72,480	8189.15	2,200
16	2.00	5.50	47,250	5338.54	1,500	N/A	N/A	N/A	N/A	N/A	N/A

Sleeve Types and Performance Data (Standard Catalog)

S-Flex sleeves are available in 3 configurations, and in 3 materials:

Solid Single Piece Sleeve (standard design)

JE – made of EPDM
JN – made of Neoprene
H – made of Hytrel®

Split Single Piece Sleeve (for easier installation)

JES – made of EPDM
JNS – made of Neoprene

Two Piece Sleeve w/ Retaining Ring (for applications with difficult shaft separation)

E – made of EPDM
N – made of Neoprene
HS – made of Hytrel®

Characteristics	Temperature Range		Misalignment Capabilities			Torsional Wind-up
	°F	°C	Angular (°)	Parallel (in)	Axial (in)	inches
EPDM - Unless otherwise specified, S-Flex couplings are supplied with EPDM flexible sleeves. EPDM has good resistance to commonly used chemicals and is generally not affected by dirt or moisture. Color is black.	-30°F to 375°F	-34°C to 135°C	1°	up to 0.062	0.125	up to 15°
NEOPRENE - Neoprene provides very good performance characteristics for most applications and offers a very good resistance to chemical and oil conditions. Color is black with a green dot.	0°F to 200°F	-18°C to 93°C	1°	up to 0.062	0.125	up to 15°
HYTREL® - Hytrel is a polyester elastomer designed for high torque and high temperature applications. It offers excellent resistance to chemical and oil conditions. Color is orange.	-65°F to 250°F	-54°C to 121°C	0.25°	up to 0.035	0.125	up to 7°

J Type Dimensional Data (3D CAD)

Please Note: CAD Files below can only be opened using a CAD Program.

For additional documentation (in PDF form), please download the S-Flex coupling catalog or contact Lovejoy customer service

Size	3D CAD File	Coupling Total Length		Coupling Outer Diameter		Hub Max Bore
		in	mm	in	mm	in	mm
3	Download	2.00	51	2.062	52	0.875	22
4	Download	2.38	61	2.460	63	1.000	25
5	Download	2.88	73	3.250	83	1.125	29
6	Download	3.50	89	4.000	102	1.375	35

S Type Dimensional Data (3D CAD)

Please Note: CAD Files below can only be opened using a CAD Program.

For additional documentation (in PDF form), please download the S-Flex coupling catalog or contact Lovejoy customer service

Size	3D CAD File	Coupling Total Length		Coupling Outer Diameter		Hub Max Bore*
		in	mm	in	mm	in	mm
5	Download	2.81	71	3.250	83	1.250	32
6	Download	3.50	89	4.000	102	1.750	44
7	Download	3.94	100	4.625	117	1.875	48
8	Download	4.39	112	5.450	138	2.375	60
9	Download	5.06	129	6.350	161	2.875	73
10	Download	5.69	145	7.500	191	3.375	86
11	Download	7.13	181	8.625	219	3.875	98
12	Download	8.25	210	10.000	254	3.938	100
13	Download	9.25	235	11.750	299	4.500	114
14	Download	9.88	251	13.875	352	5.000	127
16	Download	14.50	368	18.875	480	6.000	152

* Indicates: Max bore achieved with shallow keyway

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Catalogs

S-Flex Catalog (full catalog)

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