Release time：2020-01-16 18:44 Browse：
The number of times an extended drill tail screw can be reused before the bit dulls depends on material hardness, screw quality, operating method, and steel plate thickness. Generally, high-quality extended drill tail screws can be reused 3-5 times under standard conditions before the bit begins to lose efficiency. Below are the key factors and optimization methods:
Screw material:
Carbon steel screws: Lower hardness, typically reusable 2-3 times, suitable for thin steel plates (1-2mm).
Alloy steel or stainless steel screws (e.g., S2 tool steel or chrome-vanadium steel): Higher hardness, reusable 4-6 times, ideal for thicker plates (3-6mm).
Titanium-coated or nitrided bits offer better wear resistance.
Steel plate hardness:
Mild steel (Q235): Slower bit wear, reusable 5+ times.
High-hardness steel (e.g., 45# steel or stainless steel): Faster wear, usually 2-3 times before replacement.
Operating method:
High RPM (>2000) accelerates wear; recommended speed: 800-1500 RPM.
Vertical force application reduces uneven wear.
Pre-drilling (for very thick plates) reduces bit stress.
Slower drilling speed (e.g., takes 10+ seconds vs. original 5 seconds).
Screw slips and fails to self-tap into the plate.
Bit tip appears rounded or visibly worn.
Choose high-quality screws (e.g., hardened extended drill tail screws that can pierce 15mm steel in 5 seconds).
Control speed and feed pressure to avoid overheating.
Use lubricant (e.g., machine oil) to reduce friction.
Clean the bit regularly to prevent metal debris buildup.
Standard extended drill tail screws: Typically reusable 3-5 times (depending on steel hardness).
High-end hardened screws (e.g., titanium-coated/alloy steel): Up to 5-8 reuses or more.
For frequent use, keep spare screws or opt for replaceable-bit systems.
