BT - THERMAL SHRINK HOLDER - METRIC Taper SizeBT-40 A ➚ A .003 AT3 Taper 50-52 HRc N5 Lmax G2.5 D1 Lmin 25,000 RPM 4˚ G d D J L2 L1 L Designation d D D1 L L1 L2 Lmin Lmax J G Hex Key BT 40 SRK 3X 50 3 10 15 77 50 35.5 10 16 M6 M16 3 BT 40 SRK 3X 85 3 10 19 112 85 64.1 10 16 M6 M16 3 BT 40 SRK 4X 50 4 10 15 77 50 35.5 12 18 M6 M16 3 BT 40 SRK 4X 85 4 10 19 112 85 64.1 12 18 M6 M16 3 BT 40 SRK 5X 50 5 10 15 77 50 35.5 15 21 M6 M16 3 BT 40 SRK 5X 85 5 10 19 112 85 64.1 15 21 M6 M16 3 BT 40 SRK 6X 50 6 11 16 77 50 35.5 18 24 M8 M16 4 BT 40 SRK 6X 85 6 11 20 112 85 64.1 18 24 M8 M16 4 BT 40 SRK 8X 50 8 14 20 77 50 42.5 25 31 M10 M16 5 BT 40 SRK 8X 85 8 14 23 112 85 63.9 25 31 M10 M16 5 BT 40 SRK 10X 50 10 16 22 77 50 42.4 30 36 M12 M16 6 BT 40 SRK 10X 85 10 16 25 112 85 60.2 30 36 M12 M16 6 BT 40 SRK 12X 50 12 20 26 77 50 42.3 32 42 M10 M16 5 BT 40 SRK 12X 85 12 20 28 112 85 56.6 32 42 M10 M16 5 807