42mm Face Clamping Chuck 12mm Weldon Shank, DIN 69871 Form AD, 50mm Projection - TECWERK

Benefit from rigid, repeatable clamping and a positive-drive Weldon flat combined with an SK40 steep taper and 50 mm projection for stable machining results; order the tool holder directly via Metav Werkzeuge or consult their technical advisers for specification matching.

Weldon face-clamping chuck DIN 69871 AD (SK40, clamping Ø 12 mm) – TECWERK

The Weldon face-clamping chuck DIN 69871 AD is a SK40 tool holder engineered for rigid, positive-drive clamping of tools with cylindrical shanks and a lateral driving flat for standard milling and drilling fixtures

• DIN 69871 Form AD steep taper
• Weldon flat for positive lateral drive
• Clamping Ø 12 mm, bore tolerance H4
• SK40 shank with 50 mm projection

Consistent precision through steep-taper design

The steep taper specified by DIN 69871 Form AD and the SK40 interface deliver a compact contact area that reduces axial and radial runout during machining. This geometry supports high concentricity and repeatability, which translates into fewer setup corrections and better surface finish on workpieces. The holder’s 42 mm outer diameter and 50 mm projection balance accessibility with rigidity, enabling controlled tool engagement without excess overhang. Explaining the standard, the taper mates directly with compatible spindles to ensure a secure mechanical fit and consistent axial location.

Secure positive drive with Weldon flat for heavy cutting

Equipped with a Weldon flat, the chuck provides a defined lateral driving surface in accordance with tool-holding conventions, preventing tool rotation under torque and making it suitable for demanding milling operations. The lateral drive conforms to DIN 1835‑B guidance for cylindrical shanks with a driving flat, so tools with that feature are held with positive mechanical engagement rather than relying on friction alone. This results in improved safety margins and reduced slippage when applying higher cutting forces, leading to longer tool life and fewer interrupted production cycles.

Accurate clamping and tolerance control for reliable interchangeability

The bore tolerance H4 and the clamping Ø 12 mm specification mean the chuck is manufactured to tight internal dimensions, supporting precise clamping of shank tools and minimising axial play. Such tolerance control enables interchangeable tooling with predictable axial position and repeatable concentricity, which is especially valuable in batch production or tool-change workflows. Supplied through Metav Werkzeuge’s distribution, the component integrates into workshop systems where consistency and a transparent supply chain reduce downtime and simplify inventory management.

For procurement or application advice regarding the TECWERK Weldon face-clamping chuck, contact Metav Werkzeuge for tailored support and order handling at info@metav-werkzeuge.com or by phone on +49 2822 7131930

Technical data

• Article number: 2000833726NW
• Product type: Face clamping chuck
• Manufacturer: TECWERK
• Standard: DIN 69871 Form AD
• Label: Flächenspannfutter DIN 69871AD Weldon Spann‑D.12mm SK40 A.-L.50mm TECWERK
• Packaging unit: 1

Core dimensions

• Shank type: SK40
• Projection (A): 50 mm
• Outer diameter (D): 42 mm
• Clamping diameter (d): 12 mm
• Bore tolerance: H4

Special features

• Weldon flat (positive lateral drive)
• Steep taper to DIN 69871 Form AD
• For cylindrical shank tools with lateral driving flat to DIN 1835‑B

FAQ

What shank interface does this chuck use?
The Weldon face-clamping chuck uses an SK40 taper in accordance with DIN 69871 Form AD, offering a secure mechanical fit for SK40 spindles.

Which tool shanks are compatible with this holder?
The holder accepts tools with cylindrical shanks and a lateral driving flat to DIN 1835‑B, clamped at Ø 12 mm with the specified H4 bore tolerance for repeatable positioning.

What is the projection and how does it affect rigidity?
The 50 mm projection provides sufficient working length while keeping overhang moderate; the combination with the steep taper supports higher rigidity than longer‑overhang setups.

How does the Weldon flat improve machining safety?
The Weldon flat produces a positive lateral drive that prevents rotational slippage of the tool under torque, enhancing process reliability during heavy or interrupted cuts.

What tolerances ensure interchangeability between tools?
Bore tolerance H4 and the defined clamping Ø 12 mm ensure tight internal dimensions for predictable axial position and concentricity when changing tools in production setups.

Manufacturer / Responsible: NORDWEST Handel AG, Robert‑Schuman‑Straße 17, 44263 Dortmund