OTT-JAKOB Tool Clamping Systems and Spindle Equipment

German precision tool clamping solutions from OTT-JAKOB Spanntechnik for automated machining centers. Clamping systems, rotary unions, and diagnostic instrumentation.

HSK Tool Clamping Systems (DIN 69893 / ISO 12164)

OTT-JAKOB clamping units for hollow shank taper HSK interfaces from sizes 25 to 160. Deliver dual contact face and taper location at rotational speeds reaching 40,000 RPM. Segmented gripper collets retain tool holders reliably under extreme dynamic and cutting forces.

Standard sizes HSK-A, HSK-E, HSK-F, and HSK-T for high-speed machining spindles.
Uniform axial force transmission through precision-ground internal mechanism.
High joint rigidity during heavy roughing and ultra-precision contour finishing.
Long working lifespan achieved with wear-resistant surface treatment of jaws.

Steep Taper Clamping Mechanisms (DIN 69871, MAS-BT, CAT)

OTT-JAKOB steep taper collet systems for machine tool spindles featuring SK 30, SK 40, SK 50, and SK 60 tapers. Mechanical disc spring packs hold pull studs with consistent retention force. Solid clamping prevents axial deflection and spindle runout during heavy cutting.

Broad interface alignment for DIN 69871, MAS 403-BT, and ANSI B5.50 pull studs.
Precision gripper geometry prevents slippage and preserves pull stud contours.
High torque capacity suitable for heavy face milling and boring operations.
Fast tool changing cycles achieved via balanced unclamping stroke travel.

Polygon Shank Clamping Units PSC (ISO 26623) and KM4X

OTT-JAKOB precision clamping systems for polygon shank coupling PSC (sizes C3 to C10) and heavy-duty KM4X tool interfaces. Built for multi-tasking turning and milling centers. Deliver maximum torque transmission and sub-micron positioning repeatability under load.

Self-centering polygon profile paired with rigid axial face contact surface.
Balanced radial pressure eliminates tool tilting during multi-axis profiling.
Optimized for combined turning and milling operations on hybrid machine tools.
Manual and automated lock mechanisms for tool turrets and pick-up spindles.

Rotary Unions for Coolant and Air Feedthrough Through Spindle

OTT-JAKOB high-speed rotary unions series 1K, 2K, and 2KA-ME for media transfer through rotating machine spindles. Silicon carbide and ceramic mechanical seals endure fluid pressures up to 150 bar and operational shaft rotation up to 36,000 RPM smoothly.

Single-passage and multi-passage designs for separate fluid and air feeds.
Dry-run capability without thermal damage to matched ceramic face rings.
Engineered flow paths supporting minimum quantity lubrication (MQL) setups.
Built-in leakage detection and status feedback sensors on 2KA-ME models.

Tool Clamping Actuation Units (Hydraulic, Pneumatic)

OTT-JAKOB actuation release units engineered to stroke the drawbar and release tool holders inside machine spindles. Hydraulic, pneumatic, and electromechanical variants produce axial unclamping forces up to 120 kN while fitting compact headstock enclosures.

Spindle bearing relief mechanism shields precision bearings from axial load.
Integrated inductive sensor ports detect piston stroke points for CNC logic.
Integrated internal blow air passage clears chips from taper before clamping.
Robust piston seal design supports high cycling frequency on production lines.

Power-Check Pull Force Gauges and Spindle Condition Sensors

OTT-JAKOB Power-Check devices designed for rapid verification of tool retention force inside spindle tapers. Wireless sensor units, together with MSU and GAUS electronic monitoring modules, transmit pull-in values and piston positions to CNC machinery networks.

Direct measurement of drawbar retention load across ranges from 2 to 200 kN.
Interchangeable gauge adapters for HSK, steep taper SK, and polygon PSC tapers.
Wireless data transfer to shop-floor receivers or automated tool magazines.
Early identification of spring fatigue to eliminate workpiece machining scrap.

OTT-JAKOB engineering excellence and Jakob Group corporate foundation

The engineering heritage of OTT-JAKOB traces back to 1873, when Albert Ott established an institute of mathematics and mechanics in Kempten.

In 1993, under the leadership of Ludwig Jakob, the enterprise integrated into the Jakob Group family of companies, establishing its core focus on tool clamping technology.

Headquartered in Lengenwang, Germany, the company maintains advanced manufacturing centers, CNC grinding equipment, and automated inspection labs.

Precision production processes ensure that every clamping mechanism and rotating component meets exacting tolerances for international machine tool builders.

Precision HSK and steep taper clamping mechanisms for machine spindles

OTT-JAKOB HSK clamping units adhere strictly to DIN 69893 and ISO 12164 international interface standards.

The dual-surface contact geometry aligns both the taper shank and the planar spindle face simultaneously, eliminating axial play and maintaining sub-micron runout accuracy at speeds up to 40,000 RPM.

For conventional machining centers utilizing steep taper interfaces SK 30 through SK 60, OTT-JAKOB delivers robust drawbar collet assemblies with preloaded disc spring sets.

The mechanism provides constant pull-in force on retention knobs, preventing tool deflection during heavy milling and roughing.

High-speed rotary unions for through-spindle coolant and air delivery

Rotary unions series 1K, 2K, and 2KA-ME facilitate the transfer of coolant, dry compressed air, and air-oil lubrication through rotating motor spindles.

Premium mechanical seal faces made from silicon carbide and specialized ceramics withstand pressures up to 150 bar and peripheral speeds up to 36,000 RPM.

Integrated design protects against thermal shock during intermittent dry machining without fluid lubrication. The intelligent 2KA-ME variant features integrated electronic sensors detecting leakage, vibration, and temperature elevation to shield precision spindle bearings from fluid ingress.

Hydraulic and pneumatic actuation release units for automated spindles

Unclamping units from OTT-JAKOB are mounted at the rear end of machine tool spindles to stroke the central drawbar and release tool holders smoothly.

Product lines feature hydraulic cylinders, pneumatic pistons, and compact electromechanical drives capable of generating retention forces up to 120 kN.

An engineered spindle bearing relief mechanism absorbs axial reaction forces during unclamping, preventing detrimental loads on sensitive angular contact bearings. Clean compressed air blow passages clean the internal taper socket prior to inserting the next tool holder.

Power-Check pull force measurement systems and spindle diagnostics

The OTT-JAKOB Power-Check diagnostic device enables rapid verification of drawbar clamping force directly inside the spindle cone. Built with high-precision strain gauges and quick-change adapters for HSK, steep taper, and polygon shanks, the device covers measurement intervals from 2 kN to 200 kN.

The automated Power-Check Magazine version features wireless communication and can be stored in the tool changer for unmanned machine inspection routines. Complementary MSU and GAUS electronic monitoring modules continuously track stroke positions and clamping conditions in real time.

Maintenance protocols and replacement wear parts for clamping assemblies

Spindle productivity and machining precision depend on scheduled replacement of gripper segments, internal spring packages, and rotating union seal kits. During high-cycle production operations, clamping mechanism inspection and regreasing are recommended every 500,000 tool change cycles.

To select replacement parts for OTT-JAKOB systems, specify the serial number from the nameplate or provide spindle interface drawings and pull stud standards. Technical specialists assist machine shops worldwide with part identification and dispatch of factory-matched service components.

OTT-JAKOB Spanntechnik and model names are trademarks of their respective owners and are used only to identify the equipment for which we source parts. SpareX is not an official dealer, distributor or representative of OTT-JAKOB Spanntechnik and is not affiliated with the trademark owner. Origin, documents and warranty are stated for each item in the quotation.