LM / ML Type Flexible Spider Coupling (45# Steel, High Torque)

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LM / ML Type Plum Flexible Coupling | 45# Steel High-Torque Spider Jaw Shaft Coupling

Model Number
Check below, custom

Model	Outer Diameter (mm)	Length (mm)
LM1	50	86
LM3	70	103
LM4	85	114
LM5	105	127
LM6	125	143
LM7	145	159
LM8	170	181
LM9	200	208
LM10	230	230
LM11	260	260
LM12	300	397
LM13	360	323
LM14	400	333

Note: Non-standard customization is available. For more specifications, please contact customer service.

Product Description

LM / ML Type Plum Elastic Flexible Coupling (45# Steel & Polyurethane Spider)

High-Torque 3-Jaw Flexible Shaft Coupling for Motors, CNC Machinery & Industrial Automation

The LM (ML) Type Plum Elastic Flexible Coupling is a high-torque, heavy-duty shaft coupling engineered for demanding industrial power transmission drives. Constructed with high-hardness 45# forged steel hubs treated with a corrosion-resistant black oxide finish and equipped with a premium polyurethane elastomeric spider insert, this coupling delivers outstanding shock absorption, vibration damping, and compensation for angular, radial, and axial misalignments. Featuring precision-machined H7 tolerance shaft bores, it provides exceptional torque capacity ranging from 16 N·m up to 25,000 N·m across a broad operating temperature range (-35°C to +80°C).

Key Advantages & Features

High-Hardness 45# Steel Construction: Manufactured from premium 45# steel with a black oxide surface treatment, offering high tensile strength, deformation resistance, and exceptional torque handling compared to standard aluminum alternatives.
High-Damping Polyurethane Spider Insert: High-performance polyurethane elastic star pad provides superior shock buffering, noise attenuation, wear resistance, and long service life without lubrication.
H7 Precision Bore Machining: Shaft bores are held strictly within H7 tolerance limits to guarantee high concentricity, reduced operational vibration, and firm keyway/clamping locking power.
Wide Torque & Temperature Range: Accommodates nominal torque from 16 N·m up to 25,000 N·m with reliable performance under working temperatures between -35°C and +80°C.
Ideal for Frequent Reversing & Medium Speeds: Perfectly suited for coaxial shaft connections subject to frequent start/stops, bidirectional rotation, and high reliability requirements.

Technical Specifications

Parameter	Specification Details
Coupling Model / Series	LM / ML Type Plum Flexible Jaw Coupling Series
Hub Material	High-Strength 45# Carbon Steel (Black Oxide Surface Finish)
Elastomeric Insert Material	High-Durability Polyurethane (PU) Plum / Spider Element
Nominal Torque Capacity	16 N·m – 25,000 N·m
Inner Bore Precision	ISO H7 Standard Precision Inner Bore
Standard Bore Sizes	10 mm – 50 mm+ (Custom bore sizing supported)
Working Temperature Range	-35°C to +80°C
Fastening Method	Setscrew & Keyway Mounting (Custom Spline, Hexagon, or Square Bores Available)
Customization Options	OEM / ODM Supported (Bore, Keyway, and Non-Standard Materials)

Applications & Industries Served

The LM/ML steel plum coupling is widely integrated across high-reliability motion control and industrial driving machinery, including:

CNC Machine Tools & Automation: Milling machines, lathes, servo/stepper motor connections, and packaging systems.
Heavy Equipment & Processing: Metallurgical equipment, chemical pumps, woodworking machinery, and photovoltaic equipment.
Food Processing & Printing: Printing machinery, food packaging automation, and conveyor drive lines.
Rail & Transportation Equipment: Railway track equipment, heavy transmission shafts, and industrial motor drives.

Custom Shaft Bore Designation & OEM Services

At ApexCoupling, we provide complete custom machining services based on your technical drawings and machinery requirements.

Custom Bore & Keyway Designation Options:

Standard Keyway: Add “K” after the bore dimension (e.g., LM-50×12-12x27K).
Hexagonal Bore: Add “F” (e.g., LM-50×12-12x27F).
Square Bore: Add “S” (e.g., LM-50×12-12x27S).
Spline Bore: Add “H” (e.g., LM-50×12-12x27H).

To request a fast quote, please specify your required LM model size, shaft diameters (d1 & d2), outer diameter (D), total length (L), keyway requirements, and target order quantity.