{"product_id":"sumitomo-1655fef-pcbn-turning-insert-da90-diamond-neutral","title":"Sumitomo 1655FEF Pcbn Turning Insert DA90 Diamond Neutral","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SUMITOMO 1655FEF is a Polycrystalline Cubic Boron Nitride (PCBN) turning insert designed for precision metal cutting applications. Manufactured in the DA90 series, this uncoated, neutral-hand insert features a diamond insert shape (Shape Code C) with a 4.3 mm inscribed circle and a 0.2 mm corner radius. The PCBN substrate delivers the hardness and thermal stability required for hard-turning ferrous materials and interrupted cuts where conventional carbide falls short. Screw-type holding keeps the insert securely seated under high cutting forces. Licensed machinists and CNC tool setters are the primary users of this insert in production turning environments.\u003c\/p\u003e\u003cp\u003eThis insert is suited for finish and semi-finish turning operations on hardened steels, cast irons, and similar hard materials. The DA90 series geometry and uncoated PCBN construction make it appropriate for tight-tolerance internal and external turning passes where surface finish and dimensional accuracy are critical. It is used in CNC turning centers and manual lathes equipped for CCMA-style toolholders. Maximum depth of cut is 0.5 mm, making this a dedicated finishing insert rather than a roughing tool.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003ePCBN (Polycrystalline Cubic Boron Nitride) insert material for hard-turning capability\u003c\/li\u003e\n\u003cli\u003eUncoated bright finish with diamond shape (CCMA insert style) for consistent edge geometry\u003c\/li\u003e\n\u003cli\u003e0.2 mm corner radius for fine surface finish on tight-tolerance workpieces\u003c\/li\u003e\n\u003cli\u003eNeutral hand orientation for flexible toolholder setups\u003c\/li\u003e\n\u003cli\u003eScrew-type insert holding method for positive, repeatable seating\u003c\/li\u003e\n\u003cli\u003e7-degree relief angle with no chip breaker, optimized for controlled finishing cuts\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement or direct-fit insert for CCMA-style turning toolholders accepting a 4.3 mm inscribed circle, 1.80 mm insert thickness, and 2.30 mm hole diameter per the DA90 series specification.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation of turning inserts should be performed by qualified machinists or CNC tooling technicians with the machine fully powered down and the spindle locked before indexing or replacing the insert. Use the appropriate Torx or hex key to seat the clamping screw to toolholder manufacturer specifications — do not overtighten, as PCBN inserts are brittle and susceptible to fracture under improper clamping loads. Inspect the toolholder pocket for chips or debris before seating the insert. Verify insert orientation and hand designation before resuming operation.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Material\u003c\/strong\u003e: Polycrystalline Cubic Boron Nitride (PCBN)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Style\u003c\/strong\u003e: CCMA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Shape\u003c\/strong\u003e: Diamond (Shape Code C)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Grade\u003c\/strong\u003e: DA90\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: DA90\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Hand\u003c\/strong\u003e: Neutral\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Bright\/Uncoated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInscribed Circle\u003c\/strong\u003e: 4.3 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorner Radius\u003c\/strong\u003e: 0.2 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Thickness\u003c\/strong\u003e: 1.80 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth\u003c\/strong\u003e: 4.97 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHole Diameter\u003c\/strong\u003e: 2.30 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Depth of Cut\u003c\/strong\u003e: 0.5 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRelief Angle\u003c\/strong\u003e: 7 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClearance Code\u003c\/strong\u003e: C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTolerance Code\u003c\/strong\u003e: M\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChip Breaker\u003c\/strong\u003e: None\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Holding Method\u003c\/strong\u003e: Screw\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.012 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 23242105\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: SUMITOMO\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 1655FEF\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SUMITOMO","offers":[{"title":"Default Title","offer_id":51727362326834,"sku":"1655FEF","price":106.63,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/5ccbd4804afda836b23d2fca49269140.jpg?v=1788676744","url":"https:\/\/voomisupply.com\/products\/sumitomo-1655fef-pcbn-turning-insert-da90-diamond-neutral","provider":"Voomi Supply","version":"1.0","type":"link"}