56.8mm Self‑Locking APU Collet Chuck SK50‑APU16, DIN 69871A - Vertex

Take advantage of a robust combination of SK50 taper compatibility, self-tightening APU clamping and a precise Ø3–16 mm clamping range for reliable machining performance. Order the chuck directly via Metav Werkzeuge or ask our consultants for application advice.

Vertex SK-516 drill chuck (self-tightening APU, SK50 taper, Ø3–16 mm)

The SK-516 is a self-tightening APU drill chuck designed for SK50 spindle interfaces, offering secure clamping for small to medium diameters in general workshop and production settings.

• SK50 taper with APU16 collet system
• Self-tightening clamping action
• Clamping range Ø3–16 mm
• DIN 69871A spindle interface

Reliable clamping for consistent machining results

The self-tightening chuck provides consistent axial and radial clamping which reduces tool slippage under load. Built to interface with the DIN 69871A spindle standard, the unit ensures repeatable seating and alignment on machines equipped with an SK50 taper. The chuck’s design promotes secure holding of round shanks in the Ø3–16 mm range, translating technical clamping data into measurable gains in process stability and fewer rejects during drilling and light reaming operations.

Compatibility and integration with existing machine tools

Featuring the SK50-APU16 collet interface, the chuck integrates directly with machines using the SK50 taper without the need for adapter sleeves. The combination of the SK taper and APU collet format allows straightforward installation and removal while maintaining concentricity requirements for many production tasks. The outer dimensions and mounting standard support seamless replacement of similar spindle-mounted clamping systems, making the chuck suitable for retrofit or spare-part stocking in maintenance operations.

Practical benefits for workshop efficiency

The mechanical self-tightening function reduces setup time by simplifying clamping procedures and minimising auxiliary tightening operations. Weight and balance have been considered during development to limit spindle load while enabling fast tool changes; the unit’s moderate mass contributes to stable rotation without excessive inertia. These features together deliver a pragmatic improvement in throughput, making routine tasks quicker and less prone to human error.

Maintenance and service considerations

The chuck has been designed for easy inspection and upkeep: straightforward access to the collet system allows routine cleaning and lubrication to be performed quickly, extending component life and preserving clamping accuracy. Where replacement collets are required, the APU16 format is a commonly available standard, simplifying logistics for spare parts and reducing downtime in production environments.

Contact Metav Werkzeuge to discuss SK-516 suitability for existing SK50 spindles and to request detailed technical advice from our specialists

Technical data

• Article number: SK-516
• GTIN: 4061905095610
• Manufacturer: Vertex
• Type: Drill chuck, APU self-tightening
• Standard: DIN 69871A

Dimensions & weight

• Outer diameter: 56.8 mm
• Weight: 3.9 kg
• Clamping range: Ø3–16 mm
• Collet type: SK50-APU16

Special features & compatibility

• Self-tightening APU clamping mechanism
• Interface: SK50 taper
• Suitable for machines with DIN 69871A spindle taper
• SKU: SK-516

FAQ

What clamping range does the chuck cover? The chuck provides a clamping range of Ø3–16 mm, suitable for small to medium-diameter round shanks.

Is the SK-516 compatible with SK50 spindles? Yes, the Vertex SK-516 is designed for SK50 spindle interfaces and conforms to the DIN 69871A installation standard.

Which collet type is required for this chuck? The unit uses the APU16 collet format; compatibility is indicated by the SK50-APU16 specification.

How heavy is the chuck and does weight affect spindle balance? The chuck weighs 3.9 kg; its mass was considered in the design to maintain a balance between stability and manageable spindle load.

Can the chuck be maintained on-site by workshop staff? Routine maintenance such as cleaning and lubrication is straightforward and can be carried out by workshop personnel familiar with collet systems.

Manufacturer: Vertex Machinery Works Co., Ltd.; No. 296, Sec. 1, Feng Shih Road, Fengyuan District, Taichung City 420, Taiwan