OTT-JAKOB is a renowned German manufacturer specializing in tool clamping systems for CNC machine tools. With decades of experience, the company is known for its high-precision drawbars, rotary unions, grippers, and accessories. OTT-JAKOB products ensure reliable tool retention, high-speed performance, and long service life, making them a trusted choice among leading machine tool builders and users worldwide.
OTT-JAKOB's product portfolio includes drawbar assemblies, rotary unions, gripper systems, spindle monitoring sensors, and tool clamping accessories. Their solutions are designed to meet the highest standards of safety, performance, and efficiency, supporting demanding machining applications in industries such as aerospace, automotive, mold making, and general manufacturing.
With a focus on continuous improvement and customer satisfaction, OTT-JAKOB is trusted by OEMs and end-users in over 50 countries.
STEEP TAPER THE PROVEN
TOOL INTERFACE SOLUTION
The steep taper is the original tool interface and continues to see frequent use in the machine tool industry. Steep taper technology has proven itself for decades and, in spite of the increasingly widespread use of HSK interfaces, remains a practical solution for standard machine tools.
OTT-JAKOB Produkte - Steilkegel - Steep taper
Steilkegel - Es
ES
Steilkegel - Is
IS
THE ADVANTAGES:
Universal spindle contour
Thanks to the spindle inside contour developed by OTT-JAKOB, various standards of tool can be used in the same spindle. The universal spindle contour is compatible with all conventional tool standards.
DIN 2080 (OTT-Rille)
DIN 69871/69872 (ISO 7388/1/2 Type A)
ANSI B5.50-1978 (ISO 7388/1/2 Type B)
MAS 403-1982 BT/PT1 (45°)
MAS 403-1982 BT/PT2 (30°)
OTT-JAKOB Steilkegel - The advantages:
Force intensifying mechanism
OTT-JAKOB steep taper clamping systems feature a force intensifying mechanism which increases the force of the spring. The protected, maintenance-free position of the force intensifying mechanism at the back of the spindle shaft ensures reliable functionality over the entire life span of the clamping system.
Power drawbars have the following advantages over spring drawbars:
High pull-in forces and compact dimensions
Lower release forces, which results in less spindle bearing load and the opportunity to use smaller unclamping units
Easier to balance due to smaller masses
Self-locking effectively prevents frictional corrosion and vibration damage to the spindle taper
OTT-JAKOB Steilkegel - Power drawbars have the following advantages over spring drawbars
CONFIGURATIONS
ES
With the inside spindle drawbar, the force intensifying mechanism is in a cylinder behind the spindle shaft. Due to the position of the gearing, the position of the clamping system can be monitored with ease. The ES configuration is suitable for applications involving spindle speeds of up to 10,000 rpm.
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