HSS Jobber Length Twist Drill Bits (DIN338 Standard)

HSS stands for High-Speed Steel, a high-alloy tool steel that combines carbon, chromium, vanadium, and tungsten (or molybdenum). In industrial manufacturing, HSS is defined by its "red hardness"—the ability to maintain a sharp cutting edge even when the friction of metal-on-metal drilling generates extreme heat. At Tenyu Tool, our HSS selection ensures a Rockwell hardness of 63 HRC or higher, providing the structural stability required for heavy-duty torque.

HSS bits are the versatile standard for MRO (Maintenance, Repair, and Operations) and construction. They are effectively used in: • Industrial Workshops: For drilling mild steel, carbon steel, and iron. • Automotive Plants: For precision holes in aluminum and non-ferrous alloy components. • Contracting: Ideal for heavy-duty plastic, hardwood, and PVC where a clean, burr-free finish is required.

For wholesalers and professional importers, HSS offers three primary advantages: 1. High Toughness: Unlike brittle carbide bits, HSS can withstand the vibrations and lateral forces of hand-held drilling without snapping. 2. Heat Resistance: Stays sharp at high temperatures, reducing downtime for tool changes on assembly lines. 3. Cost-to-Performance Ratio: Offers the most reliable ROI for general-purpose metalworking.

Standard HSS bits (like 4241 or 4341 grade) can handle limited drilling in soft stainless steel. However, for Industrial Grade 304 or 316 Stainless Steel, we recommend our HSS-Co (M35/M42) series. The addition of Cobalt ensures the bit maintains a hardness of 63 HRC or higher while resisting the intense heat generated by stainless steel's work-hardening properties.

The "better" choice depends on your production volume: Standard HSS: Best for toughness and can be resharpened multiple times, making it a cost-effective choice for long-term workshop use. Titanium-Coated (TiN): These are HSS bits coated with Titanium Nitride. The coating increases surface hardness (up to 80 HRC) and reduces friction, allowing for faster drilling speeds and 3-6x longer life. However, once the coating wears off or the bit is sharpened, it reverts to the performance of a standard HSS bit.

To use HSS drill bits,apply steady, firm pressure. For bits larger than 5mm, using a split-point tip (135°) helps the bit self-center without pre-drilling a pilot hole.