L-Type 3-Jaw Flexible Coupling (Ductile Iron & NBR Rubber Pad)

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L Type 3-Jaw Flexible Shaft Coupling | Ductile Iron & NBR Rubber Spider Shaft Coupling

Model Number
Check below, custom

Model	Outer Diameter (mm)	Length (mm)
L035	16	21
L050	27.4	43
L070	35	51
L075	45	54
L090	54	55
L095	54	64
L099	65	73
L100	66	89
L110	84	108
L150	96	115

Note: Non-standard customization is available. For more sizes and specifications, please contact customer service. Bore diameter must be specified when ordering.

Product Description

L-Type 3-Jaw Flexible Shaft Coupling (Ductile Iron & NBR Rubber Pad)

Economic & High-Precision Elastic Jaw Coupling for Pumps, Motors & Automation Systems

The L-Type 3-Jaw Flexible Coupling is a highly versatile, economical, and lubrication-free shaft coupling designed for industrial power transmission. Constructed with high-strength ductile iron (or powdered metallurgy) hubs and a resilient NBR rubber spider insert, the L-series coupling provides reliable vibration damping, smooth shock absorption, and high torque resistance. Engineered with H7 precision tolerance bores, it is widely utilized across water pumps, servo motor drives, and specialized automated equipment such as wave soldering machinery.

Key Advantages & Features

High-Strength Ductile Iron Construction: Manufactured from premium ductile cast iron (also available in 45# steel, powder metallurgy, or aluminum alloy), offering exceptional tensile strength, wear resistance, and shock absorption.
H7 Precision Inner Bore Tolerance: Machined strictly to H7 inner bore tolerances for high concentricity, reduced vibration, and secure shaft locking.
Durable NBR Rubber Spider Pad: Features oil-resistant, anti-aging NBR rubber cushioning inserts that absorb dynamic drive impacts, reduce operational noise, and require zero lubrication.
Multi-Axis Deviation Compensation: Efficiently compensates for radial misalignments (up to 0.3 mm), angular deviations (up to 1°), and axial displacements (+0.5 mm to 1 mm).
Cost-Effective & Easy Maintenance: Lightweight, compact 3-jaw structure allows rapid assembly, inspection, and spider replacement without disturbing driving shafts.
Black Oxide Surface Finish: Anti-corrosion black oxide coating provides long service life in demanding industrial environments.

Technical Specifications

Parameter	Specification Details
Coupling Model	L Series 3-Jaw Flexible Coupling
Hub Material Options	Ductile Iron / Powder Metallurgy / 45# Steel / Aluminum Alloy
Elastomeric Insert Material	High-Grade Oil-Resistant NBR Rubber Pad
Bore Tolerance	ISO H7 Standard Precision Bore
Surface Treatment	Black Oxide Coating (Anti-Corrosion)
Allowable Torque Rating	Up to 54.2 kg·m (High-torque models up to 10,000 N·m)
Maximum Speed Limit	1,000 RPM (Standard operating rating)
Allowable Misalignments	Radial: 0.3 mm \| Angular: 1° \| Axial: +0.5 mm to 1 mm
Mounting / Fixing Method	Keyway with Setscrew (Square, Hexagon, or Spline Bores Optional)
Protection & Certifications	IP65 Rated, ISO Certified Facility

Applications & Industries Served

The L-type 3-jaw flexible coupling is widely deployed in light to heavy-duty power transmission applications, including:

Water Pumps & Fluid Power: Industrial centrifugal pumps, water treatment pumps, and motor-pump sets.
Industrial Automation Machinery: Wave soldering machines, PCB assembly equipment, and packaging lines.
Electric Motors & Motion Drives: AC/DC motors, servo motors, stepper drives, and gear reducers.

Customization & Non-Standard Bore Machining (OEM Support)

At ApexCoupling, we provide full OEM and custom machining services to meet your specific equipment drawings and shaft connection needs.

Custom Bore & Keyway Designation Options:

Standard Keyway: Add “K” after bore size (e.g., L035-16K).
Hexagonal Bore: Add “F” (e.g., L035-16F).
Square Bore: Add “S” (e.g., L035-16S).
Spline Bore: Add “H” (e.g., L035-16H).

To request a fast quote and drawing confirmation, please provide us with your target L-model size, shaft bore diameters (d1 & d2), keyway specifications, and quantity requirements.