BT40 Retention Knobs w/ Coolant Thru for CNC Tool Holders ISO 7388-2 Type A (often designated as LDA40 )

These pull studs have a through-hole for through-tool coolant. Based on the international standard ISO 7388/2-1984 Type A , an LDA40 pull stud typically conforms to the following physical metrics:

• Machine Interface / Taper Size: BT 40 / SK 40
• Thread Size (g1): M16x2
• Knob/Head Diameter (D1): 19 mm
• Neck/Neck Bolt Diameter (D2): 14 mm
• Pilot/Shoulder Diameter (D3): 17 mm
• Coolant ID Diameter (D4): 7.5 mm
• Overall Length (L1): 54 mm
• Functional Length (L2): 26 mm
• Thread Length (L3): 20 mm
• Wrench/Drive Size (SW): 19 mm