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Key Features
✔️Conformity Certificate supplied as standard.
✔️Our famous CB10 blacking process.
✔️Free tech support, call & speak to one of our experts.

| Size | dk | k (nom) | Drive |
|---|---|---|---|
| 3.0 (#4) | 6.00-5.70 | 1.80 | #1 |
| 3.5 (#6) | 7.00-6.64 | 2.00 | #2 |
| 4.0 (#8) | 8.00-7.64 | 2.35 | #2 |
| 4.5 (#9) | 9.00-8.64 | 2.55 | #2 |
| 5.0 (#10) | 10.00-9.64 | 2.85 | #2 |
| 6.0 (#14) | 12.00-11.57 | 3.35 | #3 |
Sizes in the table are in millimetres.
Black Stainless Steel Pozi Countersunk Chipboard Screws from Carbolts\
Our fully threaded Pozi countersunk chipboard screws are manufactured using A2 grade stainless steel (304) and finished with our fantastic Carbolts CB10 black oxide process. The CB10 process delivers a permanent, black corrosion-resistant screw that looks as good on day one as it does after years of service. No chipping or flaking, just a clean, deep black finish that holds its appearance for the long term.
Engineered for timber, designed to look the part
The thread is specifically optimised for particleboard, chipboard and softwoods — biting in cleanly without splitting the material, and holding firm without the need for a pilot hole 'in most applications'. The countersunk head sits flush with or just below the surface once driven in, leaving a neat, unobtrusive finish with no proud head to catch or snag.
Driven with a Pozi screwdriver or Pozi bit in a drill or impact driver, these screws are to install and straightforward to use - making them ideal for both professional trades and DIY applications where speed and appearance both matter.
Our CB10 black stainless chipboard screws are especially for premium kitchen fitting, bedroom furniture assembly, black-finish shelving, architectural joinery and interior fit-out work - where the fixing itself contributes to the overall aesthetic. Being stainless steel they're equally well suited to outdoor timber structures, decking subframes, garden buildings and fencing where corrosion resistance is just as important as appearance.
Why CB10 and not painted black?
The CB10 black finish chemically bonds with the stainless steel surface. It isn't a coating sitting on top waiting to be damaged - it's actually part of the screw. If you need a chipboard screw that performs in demanding environments and still looks the business years down the line, this is the fella.
Specification
Fully threaded along the entire shank with a thread profile optimised for chipboard and softwood. Available in sizes No. 4 to No. 14, with lengths from 10mm up to 140mm - covering everything from light cabinet assembly through to heavy structural timber work.
Material: A2 Stainless Steel (Grade 304)
Finish: CB10 Permanent Black Oxide
Thread: Coarse — fully threaded
Head Style: Countersunk Drive: Pozi
Typical uses: Kitchen fitting, bedroom furniture, interior joinery, black-finish shelving, architectural timber features, decking subframes, garden buildings, fencing, outdoor timber structures, chipboard and softwood assembly.
Click to download the Stainless Steel Countersunk Pozi Chipboard Screw technical information sheet.

| Updated: 4th April 2026
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