Compression spring LM28 series

coiledwaveflat wire

Product Description
Multi Wave Springs Wave Compression Springs with shim ends calculation
Description:
A wave spring, also known as coiled wave spring or scrowave spring, is a spring made up of pre-hardened flat wire in a process called on-edge coiling (edge-winding). Waves are added to give it a spring effect.

• Multi turn wave springs with shim end should be used for all applications requiring tight load-deflection specifications where axial space is critical.

The basic function of multi turn wave springs with shim end is to apply a preload force to a nut after tightening, increasing friction between nut and bolt to help prevent loosening of the fastener under vibration, providing a protective locking measure.
Material and treatment
Typical material: 65Mn spring steel; heat treatment hardness HRC44-51; surface treatment applied for corrosion/finish control.
Conditions affecting elastic life

• Manufacturing quality and material properties: poor materials or inadequate processing may cause early fatigue and spring failure.
• Operating environment: elevated temperatures or adverse environmental conditions can reduce elastic life and cause failure.

Applications of multi turn wave springs with shim end

• Precision instruments (e.g., micrometers, dial indicators, testing equipment) requiring accurate, consistent force.
• Aerospace and defense (actuators, valves, components needing reliable force in compact spaces).
• Medical devices (surgical instruments, implantable devices, diagnostic equipment needing precise force).
• Electronics (mobile phones, laptops and consumer electronics to provide consistent force in compact assemblies).
• Industrial machinery (pumps, motors and other equipment requiring reliable consistent force).

Features of multi turn wave springs with shim end

• High force in a compact design suitable for constrained axial space.
• Consistent force output enabling precise force control.
• Durable construction from high-quality spring materials.
• Shim end provides precise control of installed height and load.
• Versatile use across medical, aerospace and industrial applications.
• Low-profile design for limited-space assemblies.

Specification table (excerpt)
Header: Part No. | Operates in Bore Diameter (mm) | Lears Shaft Diameter (mm) | Load (N) | Work Height (mm) | Free Height (mm) | Waves | Turns | Thickness (mm) | Radial Wall (mm) | Spring Rate (N/MM)
LM28-H1 | 28 | 22 | 130 N | 4.57 mm | 7.24 mm | 3.5 waves | 3 turns | 0.46 mm | 2.39 mm | 48.69 N/MM
LM28-L1 | 28 | 22 | 50 N | 3.76 mm | 7.24 mm | 3.5 waves | 3 turns | 0.3 mm | 2.39 mm | 14.37 N/MM
LM28-M1 | 28 | 22 | 80 N | 4.39 mm | 7.24 mm | 3.5 waves | 3 turns | 0.38 mm | 2.39 mm | 28.07 N/MM
LM28-H2 | 28 | 22 | 130 N | 6.07 mm | 9.65 mm | 3.5 waves | 4 turns | 0.46 mm | 2.39 mm | 36.31 N/MM
LM28-L2 | 28 | 22 | 50 N | 5.00 mm | 9.65 mm | 3.5 waves | 4 turns | 0.3 mm | 2.39 mm | 10.75 N/MM
LM28-M2 | 28 | 22 | 80 N | 5.84 mm | 9.65 mm | 3.5 waves | 4 turns | 0.38 mm | 2.39 mm | 21.00 N/MM
LM28-H3 | 28 | 22 | 130 N | 7.59 mm | 12.07 mm | 3.5 waves | 5 turns | 0.46 mm | 2.39 mm | 29.02 N/MM
LM28-L3 | 28 | 22 | 50 N | 6.27 mm | 12.07 mm | 3.5 waves | 5 turns | 0.3 mm | 2.39 mm | 8.62 N/MM
LM28-M3 | 28 | 22 | 80 N | 7.32 mm | 12.07 mm | 3.5 waves | 5 turns | 0.38 mm | 2.39 mm | 16.84 N/MM
LM28-H4 | 28 | 22 | 130 N | 9.12 mm | 14.48 mm | 3.5 waves | 6 turns | 0.46 mm | 2.39 mm | 24.25 N/MM
LM28-L4 | 28 | 22 | 50 N | 7.52 mm | 14.48 mm | 3.5 waves | 6 turns | 0.3 mm | 2.39 mm | 7.18 N/MM
LM28-M4 | 28 | 22 | 80 N | 8.79 mm | 14.48 mm | 3.5 waves | 6 turns | 0.38 mm | 2.39 mm | 14.06 N/MM
LM28-H5 | 28 | 22 | 130 N | 10.64 mm | 16.89 mm | 3.5 waves | 7 turns | 0.46 mm | 2.39 mm | 20.80 N/MM
LM28-L5 | 28 | 22 | 50 N | 8.79 mm | 16.89 mm | 3.5 waves | 7 turns | 0.3 mm | 2.39 mm | 6.17 N/MM
LM28-M5 | 28 | 22 | 80 N | 10.24 mm | 16.89 mm | 3.5 waves | 7 turns | (data not specified) | (data not specified) | (data not specified)

Caractéristiques / Spécifications techniques

• Denomination: Multi Turn Wave Springs with Shim End (series)
• Material: 65Mn spring steel (common), also produced in stainless steels, Inconel, copper and titanium alloys depending on application.
• Heat treatment hardness: HRC44-51 (typical for 65Mn spring steel).
• Design features: shim ends for precise installed height and load control; multi-turn for higher force in compact axial space.
• Typical uses: precision instruments, aerospace & defense, medical devices, electronics, industrial machinery.
• Example part-range/spec table included above (many LM28-... variants with bore 28 mm and shaft 22 mm shown; loads, heights, thickness and spring rates vary by part number).