The BIG DAISHOWA MGT20-160120-35 KDCB is a dedicated floating synchro tapping collet adapter from Japan BIG DAISHOWA MEGA Synchro MGT tapping system, also defined as KDCB standard tapping spring collet assembly for MGT20 main tapping holder body. It adopts dual floating axial & radial compensation structure, matched with MGT20 tapping shank holder, clamping taps with shank dimension 16*12mm, 35mm effective extension length. Made of high-strength alloy steel with full quenching and precision slit elastic structure, it eliminates axial thrust generated by spindle tapping synchronization error, reduces tap breakage risk, improves thread finish and tap service life. Widely applied on machining centers for blind hole & through-hole tapping of mold steel, stainless steel, alloy steel and cast iron.

• Brand: BIG DAISHOWA Seiki (Japan top high-precision tool holder manufacturer)
• Full Model Code: MGT20-160120-35 KDCB
• Series Name: MEGA Synchro MGT20 Tapping Collet (KDCB standard tap collet specification)
• MGT Base Series Size: MGT20 (supports tap range M12~M20 metric taps)
• Tap Shank Matching Size: 16mm outer diameter * 12mm square flat width (160120 code)
• Effective Overhang Length: 35mm extended slim body for deep cavity tapping
• Collet Type: KDCB floating elastic tapping collet with built-in synchro compensation mechanism
• Raw Material: High tensile alloy steel, integral quenched HRC 56~59
• Slit Elastic Structure: Multi-group evenly distributed slits for 360° uniform tap clamping force
• Compensation Performance: Axial floating stroke + radial micro-offset, reduce synchronous tapping thrust load to 1/10 of standard tapping collets
• Compatible Main Holder: CKB5-MGT20 series MGT tapping chuck body
• Max Applicable Tap Spec: Metric taps M12, M14, M16, M18, M20
• Surface Treatment: Black anti-rust oxidation coating, mirror ground inner clamping surface
• Standard Package: 1 set KDCB tapping collet per original sealed box, separate from main MGT holder

• Pre-hardened mold steel: P20, 718H, NAK80 (HRC30–55)
• Fully quenched hardened steel: S136, STAVAX, Cr12MoV (HRC55–62)
• Stainless steel: 304, 316, duplex stainless alloy
• Gray cast iron, ductile iron, aluminum alloy casting
• Titanium alloy & heat-resistant superalloy

• Deep injection mold narrow cavity blind hole & through-hole tapping with M12-M20 taps
• Automotive structural parts, hydraulic valve block mass production thread machining
• Five-axis machining center long overhang tapping with limited side clearance
• High-precision thread machining requiring smooth surface and consistent dimensional tolerance
• Batch automated CNC production to lower tap breakage scrap rate
• Stainless steel & hard alloy difficult-to-cut material anti-break tapping processing

• Built-in dual synchro floating compensation mechanism: Automatically offset spindle feed rotation synchronization error, drastically cut axial thrust force on tap, extend tap service life by over 3 times compared with ordinary rigid tapping collets
• 35mm slim extended neck design: Ultra-narrow outer profile avoids workpiece sidewall collision, solves deep confined cavity tapping interference problems
• 16*12 standard tap shank matching size: Universal interchangeable with all M12-M20 standard machine taps on the market
• Multi-slit elastic alloy steel body: Uniform circumferential clamping force without tap shank deformation, stable concentricity during high-speed tapping
• Black anti-corrosion oxidation surface coating: Resists long-term coolant erosion, maintains consistent clamping precision under continuous wet cutting
• Exclusive MGT system matching: Perfect concentric fit with CKB5-MGT20 main tapping holder, no secondary runout loss after assembly, compatible with high-speed synchronous tapping function machining centers