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Adjustable Relief Series KBM20-50- *

Adjustable Relief Series KBM20-50- *

If an oil pressure generated due to a collision exceeds the set pressure, the relief function is activated and the resistance force is maintained below a certain level. The set pressure can be adjusted.

・Kayaba's unique porous orifice (KBM, KBMA, KBMD, KBA series) and tapered groove orifice (KBMT series) achieve ideal energy absorption and smooth stop.
· Even high speed shock such as injection molding picking robot shock can be stopped surely and softly.
· It is possible to stop smoothly with the low-speed series.
・As this product employs the oil lock mechanism, no bottoming occurs and the KYB mini buffer can be used as a stopper without any change.
・No stopper is needed.
・Two or more units can be used in parallel because there is less variability in performance.
・Being a Kayaba's unique porous orifice series, it can be used without adjustment within the usable range.
・Thanks to the sound-damping cap, quiet stoppage is achieved even when a high-speed collision occurs.
・Mountable in 360 degree directions.
・Available in a wide range of energy absorption from 1.2 to 392 J (0.12 to 40 kgf・m).
・Available in an energy absorption of 118 to 392 J (12 to 40 kgf・m) and a mounting screw diameter of M25 and M36 series.
・Adjustable utilizing a relief valve.

Part Number
Part NumberVolume DiscountDays to Ship Mounting Screw Diameter
Full length Lmax
Equivalent Collision Mass
Ambient Operating Temperature Range
Tip caps Equivalent Collision Mass for Collision Speed of 1 m/s

4 Days or more

M362251000-10~80Provided (Flat Shape)780

4 Days or more


4 Days or more


4 Days or more



  1. 1

Basic Information

Main Body/Related Parts Main Body Performance Adjustment Adjustable Type Orifice Structure Multi-Orifice Type
Operating Environment Standard Nominal Mounting Screw [M] 36 Body Material Steel
Absorbed Energy E(J) 390 Stroke S(mm) 50 Max. Collision Velocity(m/s) 3
Average Drag(N) 7800 Piston Rod Return Force (N)(N) 81.4 Usage Frequency (Times per Minute)(cycle/min) 8
O.D. D(φ) 53 Allowable Eccentricity Angle θ(deg) 1 Absorbed amount of energy per minute(J/min) 3140
Pitch(mm) 1.5 Piston Diameter(mm) 20

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