Introduction
The 16925-25 is a precision-engineered indexable turning toolholder designed for external machining operations on lathes and CNC turning centers. It follows a standardized clamping system (likely ISO or ANSI) to securely hold a replaceable carbide or ceramic insert. The "25" in the code typically signifies a critical dimension related to the shank size, making it a robust tool for medium-duty to heavy-duty cutting applications. Its primary function is to provide a rigid and accurate platform for the cutting insert, enabling efficient material removal, good surface finish, and stable performance in production environments.
Technical Parameters
The following table summarizes the key technical specifications for the model 16925-25.
| Parameter Category | Specification Details |
|---|---|
| Model Number | 16925-25 |
| Product Type | Indexable External Turning Toolholder (Right-Hand) |
| Insert Clamping Style | Lever-lock, Top-clamp, or Screw-clamp (model specific) |
| Insert Shape & Size | Likely a rhombic (e.g., 80° diamond) or triangular insert. The "25" may correspond to an inscribed circle size of 1/2 inch or 12.7mm. |
| Shank Size (H x B) | 25 mm x 25 mm (This is the most common interpretation for the "-25" suffix, meaning a square shank of 25mm per side). |
| Tool Length (L) | Approx. 125 mm to 150 mm (varies by manufacturer) |
| Lead Angle | Likely 95° (a common standard for this toolholder style, providing slight clearance). |
| Direction | Right-Hand (cuts from right to left) |
| Weight | Approx. 0.4 - 0.6 kg (highly dependent on shank length and material) |
| Material | High-Strength Alloy Steel, heat-treated |
| Coolant Capability | Often equipped with internal coolant holes (machine-dependent) |
Critical Note: *The interpretation of the number "16925-25" can vary between manufacturers (like Kennametal, Sandvik, Iscar, etc.). The parameters above are based on common industry standards for a toolholder with this designation. It is absolutely essential to cross-reference this number with the manufacturer's specific catalog to confirm insert type, clamping mechanism, and precise dimensions.*
Application Scenarios
This toolholder is used in a wide range of turning operations on various materials, including steel, stainless steel, cast iron, and non-ferrous metals.
External Turning (Roughing):
Used for removing large amounts of material quickly from the outside diameter of a workpiece. The robust 25mm shank provides the necessary rigidity to withstand high cutting forces.
External Turning (Finishing):
When paired with a sharp, precision-ground insert, it can achieve fine surface finishes and hold tight tolerances on the final part dimensions.
General Purpose Machining on CNC Lathes:
A versatile and common toolholder found in the tool magazines of CNC turning centers for a variety of standard facing and turning operations.
OEM and Job Shop Production:
Its standardization and reliability make it a staple in both original equipment manufacturing and custom job shops for consistent and repeatable results.
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