Locking Units

Locking units are capable of retaining forces in both axial directions. They are used in a wide variety of machines. In most versions the clamping is spring actuated, and hydraulic or pneumatic pressure is required to release it. Shaft diameters range from 10 to 250 mm. The respective holding forces vary from 0.1 to 1000 kN, depending on style and customer requirements.

If the device is used as a restraint device and emergency brake in machine tools, a special version KFHW is available. For this reason, all the external parts and sealing surfaces are made of stainless steel.

Applications

Testing Machines

Ratchless fixation of the crossrail >>

Machine for concrete bricks

Temporarily fixation of moving machine parts >>

Bending press

Securing the horizontal position during bending process >>

Turning Machine; Lathe

Fixation of the center sleeve of a lathe >>

Suspension Bridge

Fixation of the hydraulic cylinders >>

Linear Drive

Safety for the z-axis of a machine tool >>

Automotive: Assembly Line

Fixation of the body in x- and y- direction >>

Automation in refinery industry

Safe fixation of the locking of a transport container >>

Automatic Welding Machine

Ratchless fixation of the workpiece >>

Machining large Telescope Mirror

Fixation of the supporting cylinder for high-end machining >>

Steelworks

Hydraulic wedge adjustment of the lower roll >>

Machine tool

Holding up the vertical axis of a machine tool >>

Clamping via disc springs, hydraulic releasing

Different types are available to fit to the common cylinders.

KFH, round casing (hydraulic)

for round cylinders and applications which are independent from a cylinder

  1. Customer-made coupling flange

SITEMA Locking Units
type KFH

Clamping via disc springs, hydraulic releasing

For complete measurements see:
F50 - Dimensions, type KFH

TypeIdent.-NoRod Ø mmRelease press barHolding capacity kNCasing Ø mmCasing Length mm   
KFH 18KFH 018 5018701070122InquiryCAD
KFH 18KFH 018 511840570122InquiryCAD
KFH 25KFH 025 50251002095140InquiryCAD
KFH 25KFH 025 5125501295140InquiryCAD
KFH 28KFH 028 502810040115178InquiryCAD
KFH 28KFH 028 51285020115178InquiryCAD
KFH 32KFH 032 503210040115178InquiryCAD
KFH 32KFH 032 51325020115178InquiryCAD
KFH 36KFH 036 503610050138200InquiryCAD
KFH 36KFH 036 51365535138200InquiryCAD
KFH 40KFH 040 504010050138200InquiryCAD
KFH 40KFH 040 51405535138200InquiryCAD
KFH 45KFH 045 504510075155213InquiryCAD
KFH 45KFH 045 51457545155213InquiryCAD
KFH 50KFH 050 505010075155213InquiryCAD
KFH 50KFH 050 51507545155213InquiryCAD
KFH 56KFH 056 5056100100180228InquiryCAD
KFH 56KFH 056 51567070180228InquiryCAD
KFH 60KFH 060 5060100100180228InquiryCAD
KFH 60KFH 060 51607070180228InquiryCAD
KFH 70KFH 070 5070100150225302InquiryCAD
KFH 70KFH 070 51706080225302InquiryCAD
KFH 80KFH 080 5080100150225302InquiryCAD
KFH 80KFH 080 51806080225302InquiryCAD
KFH 90KFH 090 5090130250260360InquiryCAD
KFH 90KFH 090 5190100190260360InquiryCAD
KFH 100KFH 100 50100130250260360InquiryCAD
KFH 100KFH 100 51100100190260360InquiryCAD
KFH 125KFH 125 50125100330350405InquiryCAD
KFH 140KFH 140 50140100600430514InquiryCAD

KFHC, special version for machine tools (hydraulic)

SITEMA Locking Units
type KFHC

Clamping via disc springs, hydraulic releasing

For complete measurements see:
F17 - Dimensions, type KFHC

TypeIdent.-NoRod Ø mmRelease press barHolding capacity kNCasing Ø mmCasing Length mm   
KFHC 30KFHC 030 0130308116120InquiryCAD
KFHC 30KFHC 030 02305015116120InquiryCAD

KFHW, special version for machine tools

SITEMA - KFHW locking units are also suitable for operation in the presence of coolant/lubricant. For this reason, all the external parts and sealing surfaces are made of stainless steel
Should heavy soiling conditions (grinding dust, swarf, chips, other liquids, etc.) or extreme temperatures exist, please contact our technical department.

SITEMA Locking Units
KFHW, Special version for machine tools

Clamping via disc springs, hydraulic releasing

For complete measurements see:
F16 - Dimensions, type KFHW

TypeIdent.-NoRod Ø mmHolding capacity kNRelease press barCasing Ø mmCasing Length mm   
KFHW 18KFHW 018 011854075122InquiryCAD
KFHW 25KFHW 025 0125125096140InquiryCAD
KFHW 32KFHW 032 01322050115173InquiryCAD
KFHW 40KFHW 040 10403550140200InquiryCAD

KFH/X, square casing (hydraulic)

for standard cylinders DIN 24554 (160 bar)

  1. Cylinder with smallest rod diameters
  2. Cylinder with bigger rod diameters
  3. Extended tie-rods without nuts
  4. Customer-supplied coupling flange
  5. Vacant fastening threads at the front face

SITEMA Locking Units
type KFH/X

Clamping via disc springs, hydraulic releasing

For complete measurements see:
F13 - Dimensions, type KFH/X

TypeIdent.-NoRod Ø mmRelease press barHolding capacity kNCasing Height mmCasing Length mm   
KFH/X 18KX 018 111840563152InquiryCAD
KFH/X 22KX 022 112240976196InquiryCAD
KFH/X 28KX 028 1128501290200InquiryCAD
KFH/X 36KX 036 11365022115230InquiryCAD
KFH/X 45KX 045 11454020127264InquiryCAD
KFH/X 56KX 056 11564035165300InquiryCAD
KFH/X 18KX 018 1018701063152InquiryCAD
KFH/X 22KX 022 1022701576196InquiryCAD
KFH/X 28KX 028 1028902090200InquiryCAD
KFH/X 36KX 036 10368035115230InquiryCAD
KFH/X 45KX 045 104510045127264InquiryCAD
KFH/X 56KX 056 105610080165300InquiryCAD

KFH/Z, tie-rod casing (hydraulic)

for ISO 6020/2 standard cylinders
variable concerning rod diameter
5 mounting styles available: TB, JJ, C, D, DB
F19 - Dimensions, type KFH/Z

  1. Customer-made coupling flange
  2. Milles pockets are provided to clear tied-rod nuts

KFPC, special version (pneumatic)

SITEMA Locking Units
type KFPC

Clamping via disc springs, hydraulic releasing

For complete measurements see:
F21 - Dimensions, type KFPC (pneumatic)

TypeIdent.-NoRod Ø mmRelease press barHolding capacity kNCasing Ø mmCasing Length mm   
KFPC 30KFPC 030 0130412138195InquiryCAD

KFP/Z, tie-rod casing (pneumatic)

for standard cylinders ISO 6431/VDMA
F20 - Dimensions, type KFP (pneumatic)

Hydraulic clamping and releasing

The type KB is especially suited to meet extreme specifications. A wide range of special versions have been built with shaft diameters from 25 to 360 mm and holding capacities extending to more than 5000 kN.

Type KB, (hydraulic)

SITEMA Locking Units
type KB

Hydraulic clamping and releasing

For complete measurements see:
F15 - Dimensions, type KB

TypeIdent.-NoRod Ø mmHolding capacity kNRelease press barCasing Ø mmCasing Length mm   
KB 40KB 040 054080160138196InquiryCAD
KB 56KB 056 0356140160170230InquiryCAD
KB 80KB 080 0680280160226270InquiryCAD
KB 100SK 100 059100330130280322InquiryCAD
KB 110SK 110 032110450130300344InquiryCAD
KB 125SK 125 034125450130300344InquiryCAD
KB 140SK 140 030140600130335392InquiryCAD
KB 160SK 160 021160800130375402InquiryCAD
KB 180SK 180 013180950130405434InquiryCAD
KB 200SK 200 0132001100130425444InquiryCAD
KB 200SK 200 0182001500140455544InquiryCAD

Type KBP (pneumatic)

pneumatic version (type KBP) on request

Accessories

Auto-Bleeder

Air in hydraulic systems can cause various problems. Especially the dieseling-effect (compression-ignition of air-oil mixture) can cause damages to seals and sealing surfaces. Clamping devices are exceptionally in danger to this effect, due to their small hydraulic volume. Especially if the Clamping Device is situated on the very top of the hydraulic system a single manual bleeding is not always sufficient. At least in these cases an Auto-Bleeder is strongly recommended.