SDS-Plus Drill Bits

Choose by substrate and head architecture. Standard 2-cutter (Ø5-16mm) is for plain concrete, brick, block and masonry anchor holes. ZHPLUS-5X 4-cutter cross (Ø5-25mm) is for hard or reinforced concrete, precise fixings and anchor holes where incidental rebar contact is possible. Full Carbide Head (Ø6-25mm) is the higher-duty option for demanding reinforced-concrete and high-volume anchor programs. Wood, steel plate, tile and glass require their own dedicated cutting tools.

Choose Standard 2-cutter for plain concrete, brick and masonry. Choose ZHPLUS-5X 4-cutter cross for professional reinforced-concrete drilling, concrete fixing and anchor holes where rebar contact may occur: the anti-jamming carbide head and four-flute dust evacuation support stable, precise drilling. Choose Full Carbide Head when the validated project duty requires the higher-impact one-piece head architecture. For intentional reinforcement cutting, use the approved dedicated rebar or diamond system.

Optimal Settings for SDS-Plus Drilling:

RPM Guidelines:
• Ø5-10mm bits: 900-1200 RPM
• Ø12-16mm bits: 700-900 RPM
• Ø18-26mm bits: 500-700 RPM

Rule: Larger diameter = Lower RPM. Most rotary hammers auto-regulate, but if adjustable, follow these ranges.

Hammer Rate: 4000-5000 BPM (beats per minute) is optimal for concrete. This is typically fixed on the tool.

Drilling Technique:
1. Start Perpendicular: Hold drill at 90° to surface, apply light pressure to establish the hole
2. Let the Tool Work: Don't force - apply moderate pressure (5-10 lbs) and let the hammer action do the cutting
3. Pecking Motion: For holes deeper than 100mm, withdraw bit every 50mm to clear dust
4. Continuous Cooling: For Ø16mm+ or deep holes, pause every 30 seconds to prevent overheating

Common Mistakes to Avoid:
✗ Excessive pressure (causes premature wear and bit breakage)
✗ Tilting during drilling (creates oval holes)
✗ Drilling continuously without clearing dust (overheats bit and slows progress)
✗ Using rotation-only mode (will destroy the bit)

For reinforced concrete, expect to hit rebar. When you do: maintain steady pressure, don't pull back.

Visual Inspection Signs:

1. Carbide Tip Damage:
• Chipped Edges: Small chips <1mm are acceptable; chips >2mm require replacement
• Rounded Cutting Edges: Tips should be sharp and defined, not rounded
• Missing Carbide: If any carbide insert is completely gone, replace immediately
• Uneven Wear: One side worn more than another (indicates drilling at an angle)

2. Shank Wear:
• Groove Damage: SDS slots should be clean and well-defined
• Excessive Play: Bit wobbles in chuck even when locked (shank worn down)
• Scoring/Gouges: Deep scratches in the shank area

3. Flute Condition:
• Clogged Spirals: Concrete buildup that won't clean off
• Spiral Deformation: Bent or collapsed flutes

Performance Indicators:
• Drilling Speed: Takes 2x+ longer than when new
• Dust Color: Black dust indicates bit overheating (vs. gray/white concrete dust)
• Vibration: Excessive shaking or chattering during use
• Drill Behavior: Tool struggles, bogs down, or stalls frequently
• Hole Quality: Rough, oversized, or out-of-round holes

When to Replace:
• Standard (brazed carbide): After 80-150 holes (Ø10mm x 100mm in C30 concrete)
• Professional (full-head solid carbide): After 400-600+ holes — the one-piece head holds its edge far longer, especially through rebar

Pro Tip: Keep a worn bit as a 'starter' - use it to establish the hole, then switch to a sharp bit to complete. This extends sharp bit life by 30-40%.

Proper Maintenance Routine:

After Each Use:
1. Dust Removal: Use compressed air or stiff brush to clear concrete dust from flutes and SDS grooves. Dust left in grooves causes premature shank wear.
2. Wipe Down: Clean with dry cloth. For wet drilling, wipe thoroughly to prevent rust.
3. Inspect: Quick visual check for carbide chips or damage.

Weekly (for professionals):
1. Deep Clean: Soak in degreaser for 10 minutes, scrub flutes with wire brush
2. Lubricate Shank: Apply light machine oil or anti-seize compound to SDS grooves (NOT the carbide tip)
3. Check Chuck: Clean the rotary hammer's SDS chuck; blow out dust from groove slots

Storage Best Practices:

1. Organization:
• Use indexed bit case or wall-mounted holder (prevents bits from rolling/falling)
• Store vertically with carbide tip up (prevents tip damage)
• Separate by size for quick access

2. Environment:
• Dry location with <60% humidity
• Avoid temperature extremes (concrete dust absorbs moisture)
• Keep away from corrosive chemicals

3. Protection:
• Use rubber tip protectors for carbide heads (especially during transport)
• Never throw loose bits in toolbox (causes chipping)
• For long-term storage (3+ months), coat shank with rust preventive

What NOT to Do:
✗ Leave bit mounted in hammer overnight (wears chuck)
✗ Store wet bits (causes rust on shank)
✗ Stack bits on top of each other (damages carbide)
✗ Use WD-40 as lubricant (attracts dust)

Proper care can extend bit life by 50-70% and maintain optimal performance.

Our Manufacturing Standards:

ISO 9001:2015 Certified:
• Full quality management system certification
• Covers design, production, testing, and delivery
• Annual third-party audits by accredited bodies
• Ensures consistent manufacturing processes

Product Fit and Inspection:
• SDS-Plus shank compatibility checked with go/no-go gauges
• Head geometry, carbide centering, runout and groove dimensions verified by batch inspection
• DIN 8039 / ISO 5468 are straight-shank masonry-bit standards, not SDS-Plus shank standards

Compliance Documentation:
• CE documentation for applicable markets
• CE is a market-access declaration, not a drilling-performance or anchor-hole certification

Material Certifications:
• Carbide Grade YG8C: Certified tungsten carbide composition (8% Cobalt, 92% Tungsten Carbide)
• Steel Body: 40Cr chrome-molybdenum alloy steel, heat-treated to HRC 48-52
• Brazing Quality: Silver-copper brazing alloy meeting AWS A5.8 standards

Testing Procedures:
• Every production batch: Carbide hardness test (HRA 89-92)
• Random sampling: Drilling endurance test (minimum 100 holes in C30 concrete)
• 100% inspection: Shank dimensional check (groove depth, diameter tolerance ±0.02mm)

Documentation Available:
• Material test certificates (upon request for large orders)
• CE Declaration of Conformity
• ISO 9001 certificate (provided with first order)
• Third-party lab test reports (available for OEM customers)

This quality system keeps the claim focused on manufacturing control, shank fit, and batch inspection instead of misusing straight-shank masonry-bit standards.

MOQ, lead time, sample arrangement, and payment terms are reviewed case by case. They depend on the product type, specification mix, packaging scope, compliance requirements, and destination market. After you share your project details, we confirm the commercial terms in the formal quotation.

Yes. Drilling dust left in the bore is the single biggest cause of low adhesive-anchor bond strength, because the resin grips the dust layer instead of the concrete wall and pull-out falls well below the design value. Clean the bore before injecting: blow it out, brush the wall, then blow again, or drill with a dust-extraction system. Either the 2-cutter or the full-carbide-head line gives you a round, on-gauge hole, but hole cleaning is what preserves the anchor's rated load.