SITEMA GmbH & Co. KG Karlsruhe, Germany

www.sitema.com/locking-units

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

Test stand

Ratchless fixation of the crossrail of a load testing machine for concrete beams of various sizes. >>

Machine for concrete bricks

Temporarily fixation of moving machine parts during production process and in case of maintaining. >>

Bending press

Securing the horizontal position during bending process >>

Turning Machine; Lathe

Fixation of the center sleeve of a lathe for overhaul of wheel bogeys for high-speed trains. >>

Suspension Bridge

Fixation of the hydraulic cylinders of a service-cabin at a carrying rope of a suspension bridge. >>

Linear Drive

Safety for the z-axis of a machine tool. SITEMA-Locking Unit mounted directly on a the counterbalance cylinder. >>

Automotive: Assembly Line

Fixation of the body in x- and y- direction for assembling of the axles. >>

Automation in refinery industry

Safe fixation of the locking of a transport container >>

Automatic Welding Machine

Ratchless fixation of the workpiece to achieve high-quality welding. >>

Machining large Telescope Mirror

Fixation of the supporting cylinders for high-end machining of a telescope mirror of 8,2m diameter. >>

Steelworks

The hydraulic wedge adjustment of the lower roll in a high-performance roll stand is not self locking. The necessary ratchless locking of the drive is performed by a SITMA Locking Unit. >>

Machine tool

Holding up the vertical axis of a machine tool in case of a power-failure or emergency stop; safety for worker and machine >>

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 mmAdmiss. load kNRelease press barCasing Ø mmCasing Length mm
KFH 18KFH 018 5018107070122
KFH 18KFH 018 511854070122
KFH 25KFH 025 50252010095140
KFH 25KFH 025 5125125095140
KFH 28KFH 028 502840100115178
KFH 28KFH 028 51282050115178
KFH 32KFH 032 503240100115178
KFH 32KFH 032 51322050115178
KFH 36KFH 036 503650100138200
KFH 36KFH 036 51363555138200
KFH 40KFH 040 504050100138200
KFH 40KFH 040 51403555138200
KFH 45KFH 045 504575100155213
KFH 45KFH 045 51454575155213
KFH 50KFH 050 505075100155213
KFH 50KFH 050 51504575155213
KFH 56KFH 056 5056100100180228
KFH 56KFH 056 51567070180228
KFH 60KFH 060 5060100100180228
KFH 60KFH 060 51607070180228
KFH 70KFH 070 5070150100225302
KFH 70KFH 070 51708060225302
KFH 80KFH 080 5080150100225302
KFH 80KFH 080 51808060225302
KFH 90KFH 090 5090250130260360
KFH 90KFH 090 5190190100260360
KFH 100KFH 100 50100250130260360
KFH 100KFH 100 51100190100260360
KFH 125KFH 125 50125330100350405
KFH 140KFH 140 50140600100430514

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 mmHolding capacity kNRelease press barCasing Ø mmCasing Length mm
KFHC 30KFHC 030 0130830116120
KFHC 30KFHC 030 02301550116120

KFHL, certified by Lloyd's Register

SITEMA - Locking Units type KFHL have been developed to satisfy the particular requirements associated with maritime applications. For example, the complete clamping system has been thoroughly adapted, both in terms of the materials used and the special housing designed to provide protection against any hazards associated with incoming sea water. Other measures include the use of special materials for the housing and seals, as well as the use of special coatings.
The admissible load in kN denotes the actual maximum load that can be applied to a SITEMA - Locking Unit KFHL. The actual holding force is twice as high and equates to the margin required by Lloyd's Register EMEA for the purposes of personal safety.

SITEMA Locking Units
type KFHL, certifié par Lloyd's Register

Clamping via disc springs, hydraulic releasing

For complete measurements see:
F52 - Dimensions type KFHL (certified by Lloyd's Register)
TypeIdent.-NoRod Ø mmAdmiss. load kNRelease press barCasing Ø mmCasing Length mm
KFHL 18KFHL 018 501857083130
KFHL 25KFHL 025 502510100109148
KFHL 28KFHL 028 502817100129188
KFHL 32KFHL 032 503217100129188
KFHL 36KFHL 036 503625100158212
KFHL 40KFHL 040 504025100158212
KFHL 45KFHL 045 504537100175256
KFHL 50KFHL 050 505037100175256
KFHL 56KFHL 056 505650100200287
KFHL 60KFHL 060 506050100200287
KFHL 70KFHL 070 507075100225315
KFHL 80KFHL 080 508075100225315
KFHL 90KFHL 090 5090125130260416
KFHL 100KFHL 100 50100125130260416
KFHL 125KFHL 125 50125165100350422

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 011854075122
KFHW 25KFHW 025 0125125096140
KFHW 32KFHW 032 01322050115173
KFHW 40KFHW 040 10403550140200

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 mmHolding capacity kNRelease press barCasing Height mmCasing Length mm
KFH/X 18KX 018 111854063152
KFH/X 22KX 022 112294076196
KFH/X 28KX 028 1128125090200
KFH/X 36KX 036 11362250115230
KFH/X 45KX 045 11452040127264
KFH/X 56KX 056 11563540165300
KFH/X 18KX 018 1018107063152
KFH/X 22KX 022 1022157076196
KFH/X 28KX 028 1028209090200
KFH/X 36KX 036 10363580115230
KFH/X 45KX 045 104545100127264
KFH/X 56KX 056 105680100165300

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

CAD

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 mmHolding capacity kNRelease press barCasing Ø mmCasing Length mm
KFPC 30KFPC 030 0130124138195

KFP/Z, tie-rod casing (pneumatic)

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

CAD

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 054080160138196
KB 56KB 056 0356140160170230
KB 80KB 080 0680280160226270
KB 100SK 100 059100330130280322
KB 110SK 110 032110450130300344
KB 125SK 125 034125450130300344
KB 140SK 140 030140600130335392
KB 160SK 160 021160800130375402
KB 180SK 180 013180950130405434
KB 200SK 200 0132001100130425444
KB 200SK 200 0182001500140455544

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.