GBP DEE 57 57 Groove depth max = 3×groove width w ​ 27 3747 Shank / groove 27 3747 27 3748 tmax L4 L1 L Screw 21U width w 21U Grooving toolholder mm right-hand left-hand mm mm mm mm ​ 12/1,5 eShop eShop 4.5 12 26 125 279815 4 (TX15; 3.5 Nm) 16/1,5 eShop eShop 4.5 16 26 125 279815 4 (TX15; 3.5 Nm) 20/1,5 eShop eShop 4.5 21.5 29 125 279815 6 (TX25; 6 Nm) 25/1,5 eShop eShop 4.5 26.5 29 150 279815 6 (TX25; 6 Nm) 12/2 eShop eShop 6 12 30 125 279815 4 (TX15; 3.5 Nm) 16/2 eShop eShop 6 16 30 125 279815 5 (TX25; 6 Nm) 20/2 eShop eShop 6 21.5 33 125 279815 6 (TX25; 6 Nm) 25/2 eShop eShop 6 26.5 33 150 279815 6 (TX25; 6 Nm) 12/3 eShop eShop 9 12 30 125 279815 4 (TX15; 3.5 Nm) 16/3 eShop eShop 9 16 30 125 279815 5 (TX25; 6 Nm) 20/3 eShop eShop 9 21.5 33 125 279815 6 (TX25; 6 Nm) 25/3 eShop eShop 9 26.5 33 150 279815 6 (TX25; 6 Nm) 20/4 eShop eShop 12 21.5 37 125 279815 7 (TX30; 8 Nm) 25/4 eShop eShop 12 26.5 37 150 279815 7 (TX30; 8 Nm) 20/5 eShop eShop 15 21.5 38 125 279815 7 (TX30; 8 Nm) 25/5 eShop eShop 15 26.5 38 150 279815 7 (TX30; 8 Nm) 20/6 eShop eShop 18 21.5 40 125 279815 7 (TX30; 8 Nm) 25/6 eShop eShop 18 26.5 39 150 279815 7 (TX30; 8 Nm) ​ Grooving toolholder 45° Application: For free turning operations directly up to a shoulder, to create free undercuts for threading and grinding work. Note: ⌀Dmin = 30 mm (at w = 3). ■  ■ ⌀Dmin = 35 mm (at w = 2). ■ Use only with a full radius groove turning insert No. 273735 – 273739. ■ No standardised undercut according to DIN 509. 27 3762 27 L L1 t L4 w Shank / groove 27 3762 27 3763 tmin ymin L4 L1 L Screw 21W 21W width w Grooving toolholder 45° right-hand left-hand mm mm mm mm mm ​ 20/2 eShop eShop 0.5 0.35 23 33 125 279815 6 (TX25; 6 Nm) 25/2 eShop eShop 0.5 0.35 28 33 150 279815 6 (TX25; 6 Nm) 20/3 eShop eShop 0.7 0.5 23 33 125 279815 6 (TX25; 6 Nm) 25/3 eShop eShop 0.7 0.5 28 33 150 279815 6 (TX25; 6 Nm) 879