150mm Drawbar Pull Stud With Bore, ISO 7388-3 Form AD DIN 69872 Form A, SK50 Thread M24 - TECWERK

Take advantage of a hardened, standardised retention solution that ensures consistent clamping with steep‑taper toolholders and straightforward replacement logistics; the combination of proven ISO compatibility and measured heat treatment supports longer service life and predictable maintenance intervals. Order directly via Metav Werkzeuge or consult our specialists for application-specific guidance.

Retention knob ISO 7388-3 Form AD for SK50 (with bore) — TECWERK

A retention knob designed for SK50 steep‑taper toolholders, compliant with ISO 7388‑3 Form AD and DIN 69872 Form A, for secure spindle clamping in heavy‑duty machining

• Hardened to 58± HRC for wear resistance
• M24 thread, ground for repeatable seating
• Parallel ground and blued finish for corrosion protection
• ISO 7388‑3 Form AD compatible with DIN 69872 Form A

Secure clamping for steep‑taper toolholders

The retention knob fulfils the primary need for secure, repeatable clamping of toolholders with a steep taper according to DIN 69871. Fitted to an SK50 taper, the component transfers axial pull‑out force from the spindle drawbar to the toolholder body; this results in consistent seating and minimised run‑out during machining. Specified to ISO 7388‑3 Form AD (equivalent to DIN 69872 Form A), the part ensures interchangeability across compliant systems, reducing setup time and the risk of incompatibility when replacing worn or damaged knobs.

Durable construction that reduces maintenance intervals

Heat treatment to 58± HRC with a controlled case depth of 0.5–0.8 mm provides a hard wearing surface at the contact zones while retaining a tough core to resist impact loads. The thread is soft‑ground to DIN tolerances to preserve engagement accuracy, and the stem is parallel ground then brünniert (blued) to offer basic corrosion protection and smooth insertion. These manufacturing steps combine to reduce fretting and galling at the clamping interface, which in turn lowers the frequency of replacements and supports uninterrupted production cycles.

Clear dimensional data for correct selection and fitting

Key dimensions are measured and stated to help confirm suitability for specific toolholder assemblies: M24 thread, overall length L1 74 mm, shoulder length L2 34 mm, and diameters d1 28 mm, d2 21 mm, d3 25 mm, d4 11.5 mm. Such figures allow quick cross‑checking against machine and toolholder drawings so that the correct retention geometry is chosen on first attempt. The standardised form designation further assists procurement and inventory management by matching items to existing ISO and DIN references.

Operational benefits that support workflow efficiency

By specifying a component that is standardised, hardened and finish‑treated, workshops gain predictable service intervals and consistent clamping performance — two factors that contribute directly to process stability and quality output. The standard form and thread mean spares can be stocked without bespoke machining or fitting, shortening downtime when a replacement is required. Coupled with Metav’s distribution and quality‑filtering approach, the solution supports reliable supply and reduces administrative overhead for maintenance planners.

For technical enquiries or to source TECWERK retention knobs directly, contact Metav Werkzeuge for application advice and reliable delivery from Emmerich via info@metav-werkzeuge.com or call +49 2822 7131930 — Metav’s precision‑focused team will recommend the best option for specific spindle and toolholder combinations

Technical data

• Article number: 2000832701NW
• Label: Anzugsbolzen ISO 7388-3 Form AD SK50 m.Bohr.TECWERK
• Manufacturer: TECWERK
• Product type: Retention knob

Numbers / Core technical data

• Thread: M24
• L1: 74 mm
• L2: 34 mm
• d1: 28 mm
• d2: 21 mm
• d3: 25 mm
• d4: 11.5 mm
• Hardness: 58 ± HRC
• Case depth: 0.5–0.8 mm
• Standard: ISO 7388-3 Form AD (DIN 69872 Form A)

Special features / Design

• For toolholders with steep taper per DIN 69871
• Hardened in service for wear resistance
• Thread soft‑ground to DIN tolerances
• Parallel ground and blued finish
• Supplied with bore for fitting
• Compatible with SK50 taper assemblies

FAQ

What taper types is this retention knob compatible with?
The retention knob is intended for SK50 steep‑taper toolholders and is designed for use where DIN 69871 tapers are specified; the ISO 7388‑3 Form AD geometry matches compliant systems.

What does the heat treatment specification mean for service life?
A hardness of 58± HRC with a case depth of 0.5–0.8 mm gives a hardened wearing surface while preserving a tough core, which improves resistance to wear and helps extend the interval between replacements of the retention knob.

Can the M24 thread be used in all drawbar systems?
The M24 thread and soft‑ground machining follow DIN practices for accurate engagement; compatibility depends on the spindle drawbar thread and the toolholder assembly — confirm the M24 specification against machine documentation.

How does the ISO form designation affect interchangeability?
The ISO 7388‑3 Form AD designation (corresponding to DIN 69872 Form A) guarantees a standard geometry so the retention knob can be replaced with the same form across machines and suppliers without custom adaptation.

Are the dimensions suitable for inventory management?
Yes — stated dimensions (L1, L2, d1–d4) allow direct cross‑reference with toolholder drawings and support standard spare‑parts stocking for maintenance planning.

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