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Non-contact Labyrinth Seal

LYF Series Stainless Steel Non-contact Labyrinth Seal

High-speed shaft protection from dust, chips, oil mist and liquid splash

LYF stainless steel non-contact labyrinth seal front view

Multi-stage axial/radial non-contact labyrinth construction for high-speed shaft and bearing-end protection.

Model
LYF Series
Material
Stainless steel
Temperature
-200 to 300 C (confirm with assembly and operating conditions)
Pressure Capability
Non-pressure design; use a combined sealing arrangement where pressure differential, gas tightness or liquid-leakage control is required
Speed
Theoretically unlimited
Primary Contaminants
Dust, chips, oil mist, coolant and washdown-water splash
Operating Method
Inner and outer rings do not contact in normal operation; control concentricity, shaft runout, radial clearance and axial location
Standard Dimensions
Standard shaft diameters 10–100 mm and standard width 6 mm; custom sizes available
Submit Operating Conditions


Home > Seal Products > Non-contact Labyrinth Seals > LYF Series

Operating Principle and Core Benefits

The LYF stainless steel non-contact labyrinth seal protects high-speed shaft and bearing ends. Multi-stage axial and radial labyrinth passages redirect, throttle, return and expel external dust, chips, oil mist and coolant before they reach the bearing area. The inner and outer rings do not contact each other in normal operation. LYF is a non-pressure protective design; where continuous liquid level, pressure differential, gas tightness or liquid-leakage control is required, combine it with a contact seal such as a PTFE stainless steel oil seal.

01Non-contact OperationNo conventional contact-lip friction, frictional heat rise or frictional power loss, with no shaft wear grooves or wear-particle contamination risk.
02Multi-stage Labyrinth and Liquid ExpulsionAxial and radial tortuous passages work with rotational expulsion to block dust, chips, oil mist and liquid splash.
03Standard Models and Custom DesignsStandard shaft diameters are 10–100 mm with a standard width of 6 mm; custom designs are available for installation space, splash direction and shaft-end geometry.
LYF labyrinth seal d, D, B, e1 and e2 installation dimension diagram
LYF non-contact labyrinth seal axial/radial multi-stage passages and installation dimensions

Standard Model Dimensions

The following are standard model dimensions. Actual allowable speed must be confirmed against shaft diameter, surface speed, interference fit, dynamic balance, shaft runout and operating temperature.

Enter a shaft-diameter range to filter, or expand all standard dimensions
View All Standard Dimensions
Model Shaft d
mm		 OD D
mm		 Width B
mm		 e1
mm		 e2
mm		 Weight
kg		 Part No.
LYF6200 A0 10 30 6 17 27 0,010 F65851
LYF6201 A0 12 32 6 19 29 0,011 F67371
LYF6202 A0 15 35 6 22 32 0,013 F60801
LYF6203 A0 17 40 6 25 35 0,017 F62551
LYF6004 S10 20 42 6 28 38 0,051 F759711
LYF6204 A0 20 47 6 29 39 0,023 F75921
LYF6005 S10 25 47 6 33 43 0,059 F709211
LYF6205 A0 25 52 6 34 44 0,026 F70271
LYF6006 S10 30 55 6 39 49 0,079 F850011
LYF6206 A0 30 62 6 42 52 0,037 F85171
LYF6007 S10 35 62 6 45 55 0,097 F801711
LYF6207 A0 35 72 6 48 58 0,050 F80271
LYF6008 S10 40 68 6 50 60 0,113 F951311
LYF61908 S10 40 62 6 48 58 0,084 F951711
LYF6208 A0 40 80 6 54 64 0,061 F95351
LYF6009 S10 45 75 6 55 65 0,134 F902011
LYF61909 S10 45 68 6 53 63 0,097 F001311
LYF6209 A0 45 85 6 58 68 0,066 F00301
LYF6010 S10 50 80 6 60 70 0,145 F053511
LYF61910 S10 50 72 6 58 68 0,100 F052711
LYF6210 A0 50 90 6 63 73 0,071 F05451
LYF6011 S10 55 90 6 67 77 0,189 F004511
LYF61911 S10 55 80 6 63 73 0,126 F003511
LYF6012 S10 60 95 6 72 82 0,202 F154011
LYF61912 S10 60 85 6 68 78 0,135 F153011
LYF6013 S10 65 100 6 77 87 0,215 F1065511
LYF61913 S10 65 90 6 73 83 0,144 F104511
LYF6014 S10 70 110 6 83 93 0,268 F256651
LYF61914 S10 70 100 6 80 90 0,190 F256551
LYF6015 S10 75 115 6 89 99 0,283 F2066011
LYF61915 S10 75 105 6 85 95 0,201 F205651
LYF6016 S10 80 125 6 94 104 0,343 F3567011
LYF61916 S10 80 110 6 90 100 0,212 F356651
LYF6017 S10 85 130 6 100 110 0,360 F3068511
LYF6018 S10 90 140 6 107 117 0,428 F4569511
LYF6019 S10 95 145 6 112 122 0,447 F6069011
LYF6020 S10 100 150 6 117 127 0,465 F65569511

Selection and Installation Checklist

  1. Confirm shaft diameter and housing bore.
  2. Confirm available axial width.
  3. Provide rotational speed or surface speed.
  4. Confirm minimum and maximum operating temperatures.
  5. Identify whether the contaminant is dust, oil mist or liquid splash.
  6. Confirm splash direction and whether continuous liquid level or pressure is present.
  7. Check shaft runout, concentricity and allowable radial clearance.
  8. Confirm inner-ring interference fit and axial retention.
  9. Arrange drainage and return paths for the installation orientation.
  10. Determine whether a PTFE stainless steel oil seal is required in combination.

Equipment Applications and Operating Limits

High-speed Machining Spindles

Blocks cutting fluid, metal chips and oil mist from entering spindle-bearing areas where low-friction shaft-end protection is required.

High-speed Machining Spindle Applications

High-speed Motors and Fans

Protects bearing ends in environments containing dust, particles and external oil mist without adding contact-lip friction.

Non-contact Labyrinth Seal Series

Related Products：PTFE Stainless Steel Oil Seals

Downloads

LYF Stainless Steel Non-contact Labyrinth Seal Specification

Includes operating principle, technical data, standard dimensions, installation requirements, speed-confirmation criteria and application limits for offline selection and procurement review.

Version: V1.1Updated: July 2026Language: EnglishFile: 84 KB

Download PDF Specification

Frequently Asked Questions

Can an LYF labyrinth seal fully replace an oil seal?

Not in every application. LYF provides low-friction protection against external contamination. Where pressure differential, gas tightness, continuous liquid level or liquid-leakage control is required, combine it with a contact seal such as a PTFE stainless steel oil seal.

Can it be used under continuous immersion?

LYF is suitable for intermittent splash and external-contaminant exclusion, but is not recommended as the sole seal for continuous immersion. Continuous liquid-level applications require evaluation of drainage direction and pressure differential together with a contact seal.

How is maximum speed determined?

Calculate surface speed from shaft diameter and rotational speed, then confirm inner-ring interference, axial retention, dynamic balance, shaft runout and temperature. Ceimin engineering review is recommended above 60 m/s.

Which dimensions must be controlled during installation?

Control shaft diameter, housing bore, interference fit, concentricity, shaft runout, radial clearance, axial location and available width. The labyrinth and drainage orientation must match the contamination source.

Can it achieve IP65 or IP67?

An IP rating is a complete-enclosure test result and cannot be claimed from one labyrinth seal alone. Confirm it through the installation design, running clearances, spray direction and complete-equipment testing.

How long does a non-contact labyrinth seal last?

The non-contact design has no continuous conventional lip wear, but service life still depends on corrosion, assembly error, vibration, contaminant buildup, temperature and rotor condition. Inspect it according to the equipment maintenance schedule.

Request a Quote

Provide shaft diameter, housing bore, available width, speed, temperature, contaminants, splash direction, pressure, shaft runout and retention method so that a standard model or custom design can be confirmed.

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