Sumitomo 1GRB004 Cutoff Insert AC830P Carbide 0.1181in

Product Description

The SUMITOMO 1GRB004 is a solid carbide cutoff and grooving insert in the WCF series, designed for precision parting, grooving, chamfering, and cut-off operations on CNC lathes and turning centers. It carries manufacturer grade AC830P with a CVD coating process, delivering thermal resistance and wear performance on demanding workpiece materials. The cutting width measures 0.1181 inches with an 8-degree lead angle in a right-hand orientation. The clamp-style holding method provides secure seating in compatible WCF-series toolholders. This insert is intended for use by machinists and tool-room professionals running production or job-shop turning operations.

The 1GRB004 is suited for applications involving stainless steel and steel workpieces, corresponding to ISO material codes M and P. Typical use cases include parting-off bar stock, external grooving, and chamfering on CNC or manual turning equipment. The insert size code is 3 within the WCF series. The corner radius is 1/128 inch. It is a single-use, non-multi-use insert configuration.

Key Features

• Solid carbide construction with AC830P grade and CVD coating for extended tool life on steel and stainless steel
• Cutting width of 0.1181 inches for precise parting and grooving operations
• 8-degree right-hand lead angle for directional chip control during cut-off
• Clamp-style insert holding method for rigid, repeatable seating in WCF-series blocks
• Suitable for chamfering, cut-off, and grooving in a single insert geometry
• Material grades C5, C5A, and C6 coverage across a range of steel and stainless steel applications

Compatibility

Designed for use with WCF-series clamp-style cutoff and grooving toolholders that accept size code 3 inserts. Compatible primary workpiece materials include stainless steel and steel (ISO material codes M and P).

Installation Notes

Insert installation and indexing should be performed by a qualified machinist with the machine powered down and the spindle locked. Use the appropriate torque driver or clamp key specified for the WCF-series toolholder to seat the insert without over-tightening. Inspect the insert pocket for chips or debris before seating to ensure proper clamping contact. Follow the toolholder manufacturer guidelines for insert indexing and replacement intervals.