sds max 4 bit
IN STOCK
Bosch Pro
SDS max-4 Hammer Drill Bit (16 - 40mm)
Select variant:
Bosch PRO SDS max-4 Hammer Drill Bit — Heavy-Duty Drill Bit for Reinforced Concrete
Brand: Bosch Professional
Supplier: Startcore Ventures Limited, Nairobi, Kenya
When drilling into reinforced concrete, an ordinary masonry drill bit can quickly become the weak point in the job. Your rotary hammer may have plenty of power, and your technique may be exactly right — but the moment the bit reaches reinforcement steel, hard aggregate, or a demanding concrete structure, a poor-quality accessory jams, loses cutting efficiency, or fails outright. This is exactly the application the Bosch PRO SDS max-4 Hammer Drill Bit is built for.
What the PRO SDS max-4 Is
The PRO SDS max-4 is a professional-grade drill bit developed for long-life drilling in reinforced concrete. It features tough tungsten carbide construction, a 4-cutter head designed to keep drilling effectively when it encounters reinforcement steel, and deep flute channels that clear drilling dust and chips during heavy-duty work. Bosch states the PRO SDS max-4 can last up to 1.5 times longer than a Bosch SDS max-2 drill bit, depending on application and working conditions.
For contractors, electricians, plumbers, HVAC installers, civil engineering teams, and construction professionals in Kenya, this makes it a serious accessory for demanding drilling work — not a bit for the occasional picture-frame hole. It's built for repeated drilling into reinforced concrete, concrete, concrete building blocks, solid brick, and lime and sand brick, and fits any SDS max rotary hammer. Startcore stocks the full working range, from 16mm through to 40mm, covering everything from anchor and fixing holes up to large-diameter structural drilling.
The Real Mistake Buyers Make
Many buyers invest in a powerful SDS max rotary hammer and then attach the cheapest available bit — a flawed strategy, because the drill bit determines how efficiently the machine's power actually transfers into the material. A heavy-duty rotary hammer paired with a low-quality bit creates a performance bottleneck: the machine has the power, but the accessory is what limits how that power gets used.
Think of it as a system, not a single purchase: rotary hammer + correct SDS max drill bit + correct diameter + correct drilling technique = a genuinely productive drilling operation. The PRO SDS max-4 is designed around that professional workflow.
Long-Life Drilling in Reinforced Concrete
Reinforced concrete is significantly more demanding than ordinary masonry — a drilling accessory has to deal with hard concrete, aggregate, continuous impact, embedded reinforcement steel, deep-hole drilling, and larger diameters all at once. Bosch built the PRO SDS max-4's cutting head from high-quality tungsten carbide specifically because the cutting edge needs to withstand repeated impact against abrasive, hard materials without losing its edge.
But durability isn't only about the material — the cutting head's design matters just as much, which is where the 4-cutter design comes in.
4-Cutter Head for Reinforced Concrete
The 4-cutter head helps the bit avoid jamming or breaking when it hits reinforcement steel, and Bosch describes it as capable of drilling effectively through rebar. This matters because an operator can't always predict exactly where reinforcement bars sit inside a slab or wall — a bit can be drilling smoothly through concrete and suddenly hit steel. A poorly designed bit slows down, jams, damages its cutting edge, breaks, or produces an inaccurate hole at that point. The 4-cutter design is built specifically to hold up through that moment.
For installers working against a schedule, this matters in a very concrete way: every broken bit means downtime — lost labour hours, delayed installation, extra procurement cost, and a disrupted project schedule. A more durable accessory genuinely lowers operating cost over its working life, not just its purchase price.
Deep Flute Channels for Dust Removal
Drilling large or deep holes generates significant concrete dust and debris. If that material isn't cleared from the hole effectively, drilling efficiency drops. The PRO SDS max-4's deep-channel flute geometry is designed specifically to support efficient dust and chip removal — particularly relevant for deep anchor holes, mechanical fixing, structural installation, pipe penetrations, and large-diameter drilling, where the deeper the hole, the more chip removal becomes a limiting factor.
Fits All SDS Max Rotary Hammers — But Confirm Your Machine First
The PRO SDS max-4 uses the SDS max shank system and fits any SDS max rotary hammer. One critical point buyers regularly get wrong: SDS max is not the same as SDS plus. SDS plus bits are built for SDS plus rotary hammers; SDS max bits are built for SDS max rotary hammers. They are different systems, and buying the wrong shank type is unnecessary downtime and wasted procurement budget.
Before ordering, confirm: your rotary hammer uses an SDS max chuck, the hole diameter you need, the drilling depth required, and that this application actually suits this bit. If you're not sure which system your machine uses, or you're deciding which rotary hammer to buy alongside this bit, our Bosch Rotary Hammer buying guide walks through the SDS-plus vs SDS-max decision in detail — including the GBH 8-45 D, a genuine SDS max machine built for exactly this kind of sustained, heavy-duty work.
Choosing the Correct Diameter
Startcore stocks the Bosch PRO SDS max-4 Hammer Drill Bit in sizes from 16mm to 40mm, covering everything from smaller anchor and fixing holes through to large-diameter structural drilling. The correct choice depends on your application, not on picking the biggest bit available. Drilling for a mechanical anchor, chemical anchor, threaded rod, pipe installation, electrical conduit, or structural fixing may each call for a different hole size within that range — don't guess. For anchoring applications specifically, the wrong diameter can compromise the whole installation: too large affects anchor performance, too small prevents proper installation.
If you're unsure which diameter your job needs, match it to the hole size specified by whichever fixing system you're installing — the anchor or fastener manufacturer's specification should always be the deciding factor, not the largest bit on the shelf.
Drilling for Chemical Anchors: Where This Bit Earns Its Keep
A chemical anchor installation doesn't begin when the resin goes in — it begins when the hole is drilled. Hole diameter, depth, and quality all directly affect how well the anchor performs afterward, which makes the PRO SDS max-4 a natural pairing with Startcore's chemical anchoring range.
Genuine chemical anchor systems available through Startcore include Fischer FIS V Plus injection mortar, Sika AnchorFix 1, and Akfix C900 and C920 — browse the full range on the Chemical Anchors category page, or read the complete Chemical Anchors buying guide for help matching the right system to your job.
The customer's actual workflow is: drill hole → clean hole → inject anchor system → install fixing → allow required curing → apply load per specification. That means presenting the drill bit alongside the anchoring system it's meant to serve — not selling it in isolation — is a genuine service to the customer, not just an upsell.
One honest gap worth naming: hole-cleaning brushes, blow pumps, and other anchor-hole cleaning accessories are a genuinely important part of this workflow — dust and loose material left in the hole affects anchor performance — but I couldn't confirm Startcore currently stocks dedicated cleaning accessories. If you do, these belong directly alongside this product; if not, it's worth flagging to customers that hole cleaning per the anchor manufacturer's instructions is still required, even without a product to sell for it.
Bosch PRO SDS max-4 vs. a Standard Masonry Drill Bit
Standard Masonry Bit vs Bosch PRO SDS max-4
General masonry drilling | Heavy-duty drilling
May use a standard drill chuck | SDS max shank
Suited to lighter applications | Built for rotary hammer use
Limited design for rebar encounters | 4-cutter design for reinforced concrete
Basic flute design | Deep channels for dust and chip removal
General-purpose usage | Professional construction applications
Bosch PRO SDS max-4 vs. SDS Plus Drill Bits
SDS plus and SDS max aren't different sizes of the same system — they're built for different classes of rotary hammer entirely. SDS plus suits lighter to medium-duty drilling on smaller machines; SDS max is built for heavier-duty applications on larger equipment. The PRO SDS max-4 is specifically an SDS max accessory — if your Bosch rotary hammer uses SDS plus, this is not the right bit, regardless of diameter.
Who This Product Is For
- Construction contractors drilling regularly into concrete and reinforced concrete
- Civil engineering teams on infrastructure and structural installation work
- Mechanical and electrical contractors fixing brackets, cable supports, and mechanical systems
- HVAC installers drilling heavy-duty mounting and installation holes
- Plumbing contractors doing pipe installation and concrete penetration work
- Steel fabrication installers drilling holes ahead of anchor and bracket installation
- Building maintenance teams handling demanding repair and installation work
Extending the Life of Your SDS max-4 Drill Bit
- Use the correct rotary hammer — confirm SDS max compatibility before starting
- Select the correct diameter — don't force a bit into an application needing a different hole size
- Follow the machine's specified drilling mode per the manufacturer's instructions
- Avoid excessive side pressure — let the cutting head and hammer action do the work, rather than forcing it
- Inspect the bit regularly for visible damage or excessive wear
- Keep the shank clean — a clean shank supports proper insertion and retention in the tool
- Replace worn accessories — continuing with a severely worn bit reduces productivity rather than saving money
Common Buying Mistakes to Avoid
Buying the wrong shank — always confirm your machine uses SDS max, not SDS plus. Choosing the wrong length — total length isn't always the same as usable working depth; check the required drilling depth specifically. Choosing diameter by guesswork — for anchors and fixings, use the anchor manufacturer's specified hole diameter, not an estimate. Using the bit for an incompatible application — this bit is built for the specified masonry and concrete materials listed above, not general-purpose use. Ignoring reinforced concrete — if you expect to hit rebar, use an accessory specifically designed for it, which is exactly this product's purpose.
Frequently Asked Questions
What is the Bosch PRO SDS max-4 used for?
Drilling into reinforced concrete, concrete building blocks, lime and sand bricks, and solid brick, using an SDS max rotary hammer.
Can it drill through reinforced concrete? Yes — it's specifically designed for long-life drilling in reinforced concrete, using a 4-cutter head intended to keep drilling effectively when it encounters rebar.
Does it fit SDS plus machines? No. This is an SDS max drill bit and requires a compatible SDS max rotary hammer — it will not fit an SDS plus chuck.
Can I use this drill bit for chemical anchor installation? Yes, provided you drill to the exact diameter and depth specified by the chemical anchor manufacturer for your chosen system. Always follow the anchor manufacturer's hole-cleaning requirements as well — see our Chemical Anchors guide for the full installation process.
Why does the 4-cutter design matter? Bosch states the 4-cutter head helps prevent jamming or breakage specifically when the bit encounters reinforcement steel — a common, unpredictable event when drilling into reinforced concrete.
What if I don't already have a compatible rotary hammer? See our Bosch Rotary Hammer buying guide to choose the right SDS max machine for your required hole diameter, drilling depth, and frequency of use — don't oversize the machine for occasional light drilling, and don't undersize it for continuous heavy-duty work.
What sizes are available? Startcore stocks the Bosch PRO SDS max-4 from 16mm through to 40mm — covering standard anchor and fixing holes up to large-diameter structural drilling.
Startcore Ventures Limited is an authorized dealer of genuine Bosch Professional tools and accessories in Kenya. Browse the full Bosch Professional range, our Chemical Anchors range, or contact our technical team to confirm sizing and pricing for your project.
Bosch PRO SDS max-4 Hammer Drill Bit — Heavy-Duty Drill Bit for Reinforced Concrete
Brand: Bosch Professional
Supplier: Startcore Ventures Limited, Nairobi, Kenya
When drilling into reinforced concrete, an ordinary masonry drill bit can quickly become the weak point in the job. Your rotary hammer may have plenty of power, and your technique may be exactly right — but the moment the bit reaches reinforcement steel, hard aggregate, or a demanding concrete structure, a poor-quality accessory jams, loses cutting efficiency, or fails outright. This is exactly the application the Bosch PRO SDS max-4 Hammer Drill Bit is built for.
What the PRO SDS max-4 Is
The PRO SDS max-4 is a professional-grade drill bit developed for long-life drilling in reinforced concrete. It features tough tungsten carbide construction, a 4-cutter head designed to keep drilling effectively when it encounters reinforcement steel, and deep flute channels that clear drilling dust and chips during heavy-duty work. Bosch states the PRO SDS max-4 can last up to 1.5 times longer than a Bosch SDS max-2 drill bit, depending on application and working conditions.
For contractors, electricians, plumbers, HVAC installers, civil engineering teams, and construction professionals in Kenya, this makes it a serious accessory for demanding drilling work — not a bit for the occasional picture-frame hole. It's built for repeated drilling into reinforced concrete, concrete, concrete building blocks, solid brick, and lime and sand brick, and fits any SDS max rotary hammer. Startcore stocks the full working range, from 16mm through to 40mm, covering everything from anchor and fixing holes up to large-diameter structural drilling.
The Real Mistake Buyers Make
Many buyers invest in a powerful SDS max rotary hammer and then attach the cheapest available bit — a flawed strategy, because the drill bit determines how efficiently the machine's power actually transfers into the material. A heavy-duty rotary hammer paired with a low-quality bit creates a performance bottleneck: the machine has the power, but the accessory is what limits how that power gets used.
Think of it as a system, not a single purchase: rotary hammer + correct SDS max drill bit + correct diameter + correct drilling technique = a genuinely productive drilling operation. The PRO SDS max-4 is designed around that professional workflow.
Long-Life Drilling in Reinforced Concrete
Reinforced concrete is significantly more demanding than ordinary masonry — a drilling accessory has to deal with hard concrete, aggregate, continuous impact, embedded reinforcement steel, deep-hole drilling, and larger diameters all at once. Bosch built the PRO SDS max-4's cutting head from high-quality tungsten carbide specifically because the cutting edge needs to withstand repeated impact against abrasive, hard materials without losing its edge.
But durability isn't only about the material — the cutting head's design matters just as much, which is where the 4-cutter design comes in.
4-Cutter Head for Reinforced Concrete
The 4-cutter head helps the bit avoid jamming or breaking when it hits reinforcement steel, and Bosch describes it as capable of drilling effectively through rebar. This matters because an operator can't always predict exactly where reinforcement bars sit inside a slab or wall — a bit can be drilling smoothly through concrete and suddenly hit steel. A poorly designed bit slows down, jams, damages its cutting edge, breaks, or produces an inaccurate hole at that point. The 4-cutter design is built specifically to hold up through that moment.
For installers working against a schedule, this matters in a very concrete way: every broken bit means downtime — lost labour hours, delayed installation, extra procurement cost, and a disrupted project schedule. A more durable accessory genuinely lowers operating cost over its working life, not just its purchase price.
Deep Flute Channels for Dust Removal
Drilling large or deep holes generates significant concrete dust and debris. If that material isn't cleared from the hole effectively, drilling efficiency drops. The PRO SDS max-4's deep-channel flute geometry is designed specifically to support efficient dust and chip removal — particularly relevant for deep anchor holes, mechanical fixing, structural installation, pipe penetrations, and large-diameter drilling, where the deeper the hole, the more chip removal becomes a limiting factor.
Fits All SDS Max Rotary Hammers — But Confirm Your Machine First
The PRO SDS max-4 uses the SDS max shank system and fits any SDS max rotary hammer. One critical point buyers regularly get wrong: SDS max is not the same as SDS plus. SDS plus bits are built for SDS plus rotary hammers; SDS max bits are built for SDS max rotary hammers. They are different systems, and buying the wrong shank type is unnecessary downtime and wasted procurement budget.
Before ordering, confirm: your rotary hammer uses an SDS max chuck, the hole diameter you need, the drilling depth required, and that this application actually suits this bit. If you're not sure which system your machine uses, or you're deciding which rotary hammer to buy alongside this bit, our Bosch Rotary Hammer buying guide walks through the SDS-plus vs SDS-max decision in detail — including the GBH 8-45 D, a genuine SDS max machine built for exactly this kind of sustained, heavy-duty work.
Choosing the Correct Diameter
Startcore stocks the Bosch PRO SDS max-4 Hammer Drill Bit in sizes from 16mm to 40mm, covering everything from smaller anchor and fixing holes through to large-diameter structural drilling. The correct choice depends on your application, not on picking the biggest bit available. Drilling for a mechanical anchor, chemical anchor, threaded rod, pipe installation, electrical conduit, or structural fixing may each call for a different hole size within that range — don't guess. For anchoring applications specifically, the wrong diameter can compromise the whole installation: too large affects anchor performance, too small prevents proper installation.
If you're unsure which diameter your job needs, match it to the hole size specified by whichever fixing system you're installing — the anchor or fastener manufacturer's specification should always be the deciding factor, not the largest bit on the shelf.
Drilling for Chemical Anchors: Where This Bit Earns Its Keep
A chemical anchor installation doesn't begin when the resin goes in — it begins when the hole is drilled. Hole diameter, depth, and quality all directly affect how well the anchor performs afterward, which makes the PRO SDS max-4 a natural pairing with Startcore's chemical anchoring range.
Genuine chemical anchor systems available through Startcore include Fischer FIS V Plus injection mortar, Sika AnchorFix 1, and Akfix C900 and C920 — browse the full range on the Chemical Anchors category page, or read the complete Chemical Anchors buying guide for help matching the right system to your job.
The customer's actual workflow is: drill hole → clean hole → inject anchor system → install fixing → allow required curing → apply load per specification. That means presenting the drill bit alongside the anchoring system it's meant to serve — not selling it in isolation — is a genuine service to the customer, not just an upsell.
One honest gap worth naming: hole-cleaning brushes, blow pumps, and other anchor-hole cleaning accessories are a genuinely important part of this workflow — dust and loose material left in the hole affects anchor performance — but I couldn't confirm Startcore currently stocks dedicated cleaning accessories. If you do, these belong directly alongside this product; if not, it's worth flagging to customers that hole cleaning per the anchor manufacturer's instructions is still required, even without a product to sell for it.
Bosch PRO SDS max-4 vs. a Standard Masonry Drill Bit
Standard Masonry Bit vs Bosch PRO SDS max-4
General masonry drilling | Heavy-duty drilling
May use a standard drill chuck | SDS max shank
Suited to lighter applications | Built for rotary hammer use
Limited design for rebar encounters | 4-cutter design for reinforced concrete
Basic flute design | Deep channels for dust and chip removal
General-purpose usage | Professional construction applications
Bosch PRO SDS max-4 vs. SDS Plus Drill Bits
SDS plus and SDS max aren't different sizes of the same system — they're built for different classes of rotary hammer entirely. SDS plus suits lighter to medium-duty drilling on smaller machines; SDS max is built for heavier-duty applications on larger equipment. The PRO SDS max-4 is specifically an SDS max accessory — if your Bosch rotary hammer uses SDS plus, this is not the right bit, regardless of diameter.
Who This Product Is For
- Construction contractors drilling regularly into concrete and reinforced concrete
- Civil engineering teams on infrastructure and structural installation work
- Mechanical and electrical contractors fixing brackets, cable supports, and mechanical systems
- HVAC installers drilling heavy-duty mounting and installation holes
- Plumbing contractors doing pipe installation and concrete penetration work
- Steel fabrication installers drilling holes ahead of anchor and bracket installation
- Building maintenance teams handling demanding repair and installation work
Extending the Life of Your SDS max-4 Drill Bit
- Use the correct rotary hammer — confirm SDS max compatibility before starting
- Select the correct diameter — don't force a bit into an application needing a different hole size
- Follow the machine's specified drilling mode per the manufacturer's instructions
- Avoid excessive side pressure — let the cutting head and hammer action do the work, rather than forcing it
- Inspect the bit regularly for visible damage or excessive wear
- Keep the shank clean — a clean shank supports proper insertion and retention in the tool
- Replace worn accessories — continuing with a severely worn bit reduces productivity rather than saving money
Common Buying Mistakes to Avoid
Buying the wrong shank — always confirm your machine uses SDS max, not SDS plus. Choosing the wrong length — total length isn't always the same as usable working depth; check the required drilling depth specifically. Choosing diameter by guesswork — for anchors and fixings, use the anchor manufacturer's specified hole diameter, not an estimate. Using the bit for an incompatible application — this bit is built for the specified masonry and concrete materials listed above, not general-purpose use. Ignoring reinforced concrete — if you expect to hit rebar, use an accessory specifically designed for it, which is exactly this product's purpose.
Frequently Asked Questions
What is the Bosch PRO SDS max-4 used for?
Drilling into reinforced concrete, concrete building blocks, lime and sand bricks, and solid brick, using an SDS max rotary hammer.
Can it drill through reinforced concrete? Yes — it's specifically designed for long-life drilling in reinforced concrete, using a 4-cutter head intended to keep drilling effectively when it encounters rebar.
Does it fit SDS plus machines? No. This is an SDS max drill bit and requires a compatible SDS max rotary hammer — it will not fit an SDS plus chuck.
Can I use this drill bit for chemical anchor installation? Yes, provided you drill to the exact diameter and depth specified by the chemical anchor manufacturer for your chosen system. Always follow the anchor manufacturer's hole-cleaning requirements as well — see our Chemical Anchors guide for the full installation process.
Why does the 4-cutter design matter? Bosch states the 4-cutter head helps prevent jamming or breakage specifically when the bit encounters reinforcement steel — a common, unpredictable event when drilling into reinforced concrete.
What if I don't already have a compatible rotary hammer? See our Bosch Rotary Hammer buying guide to choose the right SDS max machine for your required hole diameter, drilling depth, and frequency of use — don't oversize the machine for occasional light drilling, and don't undersize it for continuous heavy-duty work.
What sizes are available? Startcore stocks the Bosch PRO SDS max-4 from 16mm through to 40mm — covering standard anchor and fixing holes up to large-diameter structural drilling.
Startcore Ventures Limited is an authorized dealer of genuine Bosch Professional tools and accessories in Kenya. Browse the full Bosch Professional range, our Chemical Anchors range, or contact our technical team to confirm sizing and pricing for your project.
Similar Products
