This form is applicable to Japan domestic market only

Applicable holder (edge width 2 to 8mm) External machining: GNDS Type (→F24), GNDM Type (→F22, F26), GNDMS Type (→F26), GNDL Type (→F22, F28), GNDLS Type (→F28) Boring: GNDI Type (→F38) * Note that GNDIS type cannot be used because its insert shape is not compatible. Facing: GNDF (→F33), GNDFS Type (→F35) Special inserts with a ground chipbreaker (customized edge width and Company Name / Contact Information (Phone, fax, address, etc.) nose radius) are available. To order, make a copy of this form, fill it out (circle your preferences and specify dimensions), and send it to your nearest Sumitomo Electric Hardmetal dealer or distributor. For grooving inserts with a shape, edge length or grade other than those listed below, contact your nearest Sumitomo Electric Hardmetal sales office (see the contact information at the end of this catalog.

ShapeItemDescription
Edge width CW (mm)
CW RELNose radius RER (mm)
Nose radius REL (mm)
CDXGrade (Select from the list on the right.)1 Depth of groove CDX (mm)2AC530U`・`AC520U`・`EH520`・`H10`・`KH03

Grooving

Cut-Off

Threading

*1 Grade H10 has sharp edge. *2 Specify a chipbreaker width depending on the depth of groove (CDX). The actual depth of groove shall be equal to or less than the maximum depth of groove specified for standard holders.

Notes

1. The applicable standard holder varies depending on the edge width. See the table on the right for edge width and nose radius for facing. (If larger nose radius is required for

facing, the holder may be modified to prevent interference with the work material.)Edge Width CWApplicableMaximum Nose Radius (RER, REL)
2. The maximum nose radius for external/internal machining is equal to a half of the(Nominal)Standard Holderfor Grooving (Standard Holder)
edge width.2.00 to 2.59mm2mm wide holder0.2mm
3. The tolerance of edge width CW shall be ±0.025mm.
2.60 to 3.59mm3mm wide holder0.4mm
4. The dimension WF of each holder is calculated using the formula below, where CWS
stands for the standard insert edge width for the applicable holder.3.60 to 4.59mm4mm wide holder
(Dimension WF of a standard holder) + (WF - CWS) / 24.60 to 5.59mm5mm wide holder0.8mm
5. Polishless inserts are also available depending on the edge width in inch.5.60 to 6.59mm6mm wide holder

Contact your nearest Sumitomo Electric Hardmetal sales office for more information.