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  3. DRILTEC SM-390-390

DRILTEC SM-390-390 Sds Rotary Hammer Drill Bit 605611031308 7/8 15-3/4

Sm-390-390 Driltec Sds-max Rotary Hammer Drill Bit 7/8 Inch X 15-3/4

( Brand: Driltec ), ( Manufacturer Part Number: SM-390-390 ), ( Model: SDS-MAX ), ( Part Type: Bit Hammer Drill ), ( UPC: 605611031308 ), ( Bit Size: 7/8 ), ( Country Of Origin: Germany )

Review DRILTEC Sds max Rotary Hammer Drill Bit 7/8 Inch 15-3/4

The **Driltec SM-390-390 SDS-Max Rotary Hammer Drill Bit** is a high-performance, heavy-duty tool designed for professionals and serious DIY enthusiasts who demand precision, durability, and unmatched efficiency in demanding masonry and concrete applications. Engineered with a **7/8-inch diameter** and a **15-3/4-inch overall length**, this SDS-Max bit strikes the perfect balance between reach and power, making it ideal for drilling into reinforced concrete, brick, block, and other tough materials with confidence. The bit features a **high-carbon, shock-resistant steel shank**, which is precision-ground to ensure a secure and vibration-free fit within SDS-Max drill drivers, reducing slippage and maximizing torque transfer for cleaner, more controlled drilling. Its **triple-flute design** enhances chip evacuation, preventing clogging and allowing for smoother, faster drilling even in dense or abrasive materials. The **hardened tungsten carbide tips** on each of the three cutting edges provide exceptional wear resistance, extending the bit s lifespan and maintaining sharpness over prolonged use, while the **optimized helix angle** ensures efficient debris removal, reducing the risk of overheating and prolonging both the bit and the tool s performance.

What truly sets the Driltec SM-390-390 apart is its **robust construction**, which incorporates a **heat-treated, alloy steel body** reinforced with a **spiral groove pattern** that not only improves cooling but also enhances the bit s structural integrity under high-stress conditions. The **SDS-Max drive system** is fully compatible with leading brands of rotary hammers, ensuring a tight, reliable connection that minimizes shock transmission to the operator s hands, reducing fatigue during extended use. Whether tackling deep, straight holes for plumbing or electrical installations, or making precise anchor points for heavy-duty fixtures, this bit delivers consistent, professional results with minimal effort. Its **versatility** extends beyond standard applications, as it can also be used for demolition work, chiseling, and light masonry cutting when paired with the right tool. Built to withstand the rigors of professional use, the Driltec SM-390-390 is an indispensable tool for contractors, masons, and builders who refuse to compromise on quality or performance. With its combination of **precision engineering, durability, and efficiency**, it stands as a reliable workhorse in any toolkit, ensuring that even the most challenging masonry projects are completed with ease and precision.

The **Driltec SM-390-390 SDS-Max Rotary Hammer Drill Bit (7/8" x 15-3/4")** is a popular choice for heavy-duty masonry drilling, but like any tool, it has advantages and limitations. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **Durability and Build Quality**

The Driltec brand is known for producing robust, long-lasting tools designed for professional and heavy-duty use. This bit is made from high-quality steel, likely hardened and tempered to withstand extreme wear from drilling into concrete, brick, and stone. The SDS-Max shank ensures a secure fit in compatible drills, reducing slippage and improving torque transfer.

2. **Versatility for Masonry Work**

The **7/8" diameter** is a standard size for many masonry applications, including:

- Installing anchors, bolts, or rebar in concrete walls.

- Drilling holes for electrical conduits or plumbing pipes.

- Cutting through brick, block, and lightweight concrete.

The **15-3/4" length** provides sufficient reach for most residential and light commercial projects without being overly cumbersome.

3. **Efficient Cooling and Dust Extraction**

The design includes cooling flutes that help expel debris and reduce heat buildup during prolonged use. This extends the bit s lifespan and improves drilling performance, especially in dense materials. Many SDS-Max bits also work well with dust extraction systems, making them safer for prolonged use.

4. **Compatibility with SDS-Max Tools**

This bit is designed specifically for **SDS-Max drills** (e.g., DeWalt, Milwaukee, Makita, and Bosch), which are built for higher torque and impact force. The SDS-Max system reduces vibration and provides better control, making it ideal for professional users who demand precision and power.

5. **Cost-Effective for Heavy Use**

While not the cheapest bit on the market, the Driltec SM-390-390 offers a good balance between price and performance. It is often more affordable than premium brands like DeWalt or Milwaukee but still holds up well under regular use. For contractors or DIYers who drill frequently, this bit can be a cost-effective long-term investment.

6. **Easy to Replace and Maintain**

SDS-Max bits are straightforward to install and remove, and the design minimizes wear on the drill s mechanism. Regular cleaning and occasional light oiling of the shank can prolong the bit s life, making maintenance simple.

7. **Good for Both Drilling and Breaking**

The rotary hammer action of this bit allows it to function as both a drill and a breaker, making it useful for tasks like:

- Drilling pilot holes before installing anchors.

- Breaking through stubborn concrete patches.

- Clearing obstructions in masonry.

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### **Cons**

1. **Limited to SDS-Max Drills**

This bit **will not work** with standard SDS or regular hammer drills. If you own a non-SDS-Max drill, you ll need to purchase a different bit or upgrade your tool. This can be a drawback if you have a collection of older or smaller drills.

2. **Not Ideal for Extremely Hard Materials**

While this bit excels in concrete and brick, it may struggle with **extremely hard materials** like granite, basalt, or reinforced concrete with dense steel rebar. In such cases, a specialized bit (e.g., a diamond core bit or a harder alloy) may be required.

3. **Potential for Clogging**

If not cleaned regularly, the flutes can clog with dust and debris, reducing efficiency and increasing heat. This requires periodic maintenance, which some users may find inconvenient.

4. **Weight and Fatigue**

SDS-Max bits are heavier than standard bits due to their robust construction. Prolonged use can lead to hand or arm fatigue, especially for users who are not accustomed to heavy-duty tools. Wearing gloves and taking breaks can help mitigate this.

5. **Limited Availability of Replacements**

While Driltec is a reputable brand, some users report that replacement bits may not always be readily available in local hardware stores. Online retailers (e.g., Amazon, Home Depot, or specialty tool suppliers) are more likely to carry them.

6. **Noise and Vibration**

Like all rotary hammer bits, this one generates significant noise and vibration. Prolonged exposure can be uncomfortable for the user, and hearing protection is recommended. Some users may also experience wrist or arm discomfort if proper techniques (e.g., two-handed grip, ergonomic stance) are not used.

7. **Cost Relative to Premium Brands**

While affordable for a professional-grade bit, it may not match the longevity or precision of higher-end brands like **DeWalt, Milwaukee, or Ingersoll Rand**. If you re doing extensive masonry work, investing in a premium bit could extend the life of your tools and reduce downtime.

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### **Conclusion**

The **Driltec SM-390-390 SDS-Max Rotary Hammer Drill Bit (7/8" x 15-3/4")** is a **solid, reliable choice** for users who need a durable, cost-effective bit for masonry drilling. It excels in durability, compatibility with SDS-Max drills, and versatility for common construction tasks. However, it is not without limitations it requires proper tool compatibility, regular maintenance, and is not suited for the hardest materials. For most DIYers, contractors, and professionals working with standard concrete and brick, this bit delivers excellent performance.

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### **Recommendation**

- **Buy this bit if:**

- You own an **SDS-Max drill** and need a reliable, mid-range masonry bit.

- You frequently drill into **concrete, brick, or block** and want a durable, cost-effective solution.

- You prioritize **longevity and ease of use** over ultra-premium performance.

- You re working on **residential or light commercial projects** where extreme hardness is not a major concern.

- **Consider alternatives if:**

- You need to drill into **extremely hard materials** (e.g., granite, reinforced concrete) and may require a diamond or carbide-tipped bit.

- You don t own an **SDS-Max drill** and need a bit for a standard SDS or regular hammer drill.

- You re on a tight budget and can find a **budget SDS-Max bit** (e.g., from brands like **Einhell or Metabo**) that meets your needs.

- You plan to use the bit **exclusively for breaking** (in which case, a dedicated breaker bit may be better).

- **Upgrade to a premium bit (e.g., DeWalt, Milwaukee) if:**

- You re a **professional contractor** who drills extensively and wants maximum durability and precision.

- You work with **reinforced concrete or very hard materials** regularly.

- You want **longer warranties and better customer support** for high-stakes projects.

For the average user, the **Driltec SM-390-390 is a well-rounded, practical choice** that offers great value for its price. If you re satisfied with its performance and compatibility, it s a worthwhile purchase. However, if your needs are more specialized, exploring other options may be beneficial.

Details:

Made by the reputable brand Driltec in Germany, this drill bit features a 7/8 size and length of 15-3/4 with TL 21-1/4. The Driltec SDS-Max Rotary Hammer Drill Bit is a high-quality tool designed for drilling tasks in various industrial and commercial settings.

part #: sm390390 price

  • $39.99

specifications rotarydrilli:

  • brand: Driltec
  • mpn: Sm-390-390
  • model: Sds-max
  • part type: Bit Hammer Drill
  • upc: 605611031308
  • bit size: 7/8
  • country of origin: Germany

shipping rotarydrilli:

  • class: Standard
  • service: USPS Ground Advantage
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  • transit: 4-10 Days
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  • carrier: USPS

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  • # reviews: 2692
  • city: Terry, Mississippi
  • rating: 100.0%

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  • best offers: True
  • sold: 0
  • started: May 5, 2026
  • quantity: 1
  • availability: In Stock
  • options: Ship-to-home

general rotarydrilli:

  • condition: New
  • Light Equipment Tools > Drills Hammers > Hammer Drills

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part type: bit hammer drill, bit size: 7/8, country of origin: germany,
category: business & industrial > drills hammers > hammer drills, sku: 7536261823333891,
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1 offer $39.99 USD
  • New. Offer #1 priced at $39.99 + $0.00 shipping estimate = $39.99* total. Made by the reputable brand Driltec in Germany, this drill bit features a 7/8" size and a length of 15-3/4" with a TL of 21-1/4" The Driltec SDS-Max Rotary Hammer Drill Bit is a high-quality tool designed for drilling tasks in various industrial and commercial settings.FREE SHIPPING

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