Premium multipurpose chipboard screw engineered for flooring, joinery and timber construction, featuring Type 17 self-cutting point and anti-jacking reamer for improved clamping performance and reduced board splitting.
- Multi-Material: Ideal for flooring, joinery, MDF, and timber construction.
- No Pilot Holes: Type 17 point for fast starts without timber splitting.
- Anti-Squeak: Integrated reamer ensures tight, gap-free flooring fixes.
- Flush Finish: 6-rib double countersunk head for maximum strength.
- High Grip: 40° deep thread profile for superior holding power.
- Trade Boxes: Supplied in bulk packs of 100 or 200 (YZP finish)
- Certified Quality: Fully compliant with BS EN 14592 for structural timber use.
MAXFIX APX Premium Chipboard Screw CSK Pozi – YZP – Trade Box (100-200)
Premium multipurpose chipboard screw engineered for flooring, joinery and timber construction, featuring Type 17 self-cutting point and anti-jacking reamer for improved clamping performance and reduced board splitting.
- Multi-Material: Ideal for flooring, joinery, MDF, and timber construction.
- No Pilot Holes: Type 17 point for fast starts without timber splitting.
- Anti-Squeak: Integrated reamer ensures tight, gap-free flooring fixes.
- Flush Finish: 6-rib double countersunk head for maximum strength.
- High Grip: 40° deep thread profile for superior holding power.
- Trade Boxes: Supplied in bulk packs of 100 or 200 (YZP finish)
- Certified Quality: Fully compliant with BS EN 14592 for structural timber use.
Engineered to Solve Professional Joinery Problems
The MAXFIX APX Premium Chipboard Screw addresses the three primary challenges encountered on-site: timber splitting, material jacking, and the time-consuming need for pilot holes. The advanced Type 17 slash point self-cuts into timber and sheet materials, eliminating pre-drilling in most applications, while the saw-tooth cutting edge prevents splitting even when fixing close to board edges.
Integrated Anti-Jacking Technology
The defining feature of the APX range is the integrated anti-jacking reamer. Unlike standard screws that can push materials apart, the reamer clears wood fibres from the countersink hole. This allows the screw to pull the top material tightly against the substrate for a rock-solid clamp. This is critical for P5 moisture-resistant chipboard and tongue-and-groove flooring, as it eliminates the gaps that cause irritating floor squeaks.
High-Torque Strength & Durability
Built for modern impact drivers, the double countersunk head features 6 reinforcing ribs to prevent head-shearing under high torque. The 40-degree deep thread profile ensures maximum bite and superior holding power in chipboard, MDF, and timber substrates. Finished in Yellow Zinc (YZP), these screws offer reliable corrosion resistance for all internal and covered exterior construction.
Fully compliant with BS EN 14592 for load-bearing timber structures, the MAXfix APX is ideal for:
-
Flooring: P5 chipboard and sub-floor installations.
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Carpentry: First and second fix joinery.
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Construction: Timber subframes and general woodworking.
Please Note: These screws are designed for timber-to-timber use. They are not suitable for masonry, metal-to-metal applications, or fully exposed marine environments requiring stainless steel.
✓ Self-cutting Type 17 point assists clean entry into timber
✓ Reamer clears upper material to prevent board lift and squeaks
✓ Deep thread profile increases holding strength in chipboard and joists
✓ Double countersunk head enhances head strength under torque
✓ Pozi drive ensures strong bit engagement and reduced cam-out
✓ Surface hardened construction for improved wear resistance
Specifications Table – APXMPS
| Feature | Specification |
|---|---|
| Product Name | MAXfix APX Premium Chipboard Screw |
| Product Code | APXMPS |
| Brand | MAXfix |
| Head Type | Countersunk (CSK) Pozidriv (Pozi) |
| Drive Type | PZ2 Pozidriv (Not Phillips) |
| Point Type | Type 17 Slash Point (Self-Cutting) |
| Thread Type | 40-Degree Deep Thread with Saw-Tooth Cutting Edge |
| Special Features | Anti-Jacking Reamer, Double Countersunk Head, 6 Reinforcing Ribs |
| Head Design | Double Countersunk with 6 Ribs for Increased Strength |
| Surface Finish | YZP (Yellow Zinc Plated) |
| Corrosion Resistance | Interior & Covered Exterior Applications |
| Material Compatibility | Chipboard, MDF, Plywood, Softwood, Hardwood, Engineered Timber |
| Primary Applications | Flooring, Joinery, Carpentry, Decking Subframes, General Construction |
| Not Suitable For | Masonry, Metal-to-Metal, Fully Exposed Exterior, Marine Environments |
| Box Quantities | 100 or 200 (Size Dependent) |
| Available Sizes | 4.0 × 30mm to 6.0 × 150mm (8 Variants) |
| Driver Bit Required | PZ2 Pozidriv |
| Country of Origin | United Kingdom |
| Supplied With | Recycled Polyester Pouch (Made from 2 × 1L Plastic Bottles) |
| Packaging | Recycled Paper Box |
| Safety Certification | BS EN 14592 (Timber Structures - Fasteners - Requirements) |
Variations Table – APXMPS
| Diameter × Length | Box Quantity | Variation Code | Typical Application |
|---|---|---|---|
| 4.0 × 30mm | 200 | APX4030 | MDF, thin sheet material, trim fixing |
| 4.0 × 40mm | 200 | APX4040 | Chipboard flooring to joists, general sheet fixing |
| 4.0 × 50mm | 200 | APX4050 | Standard flooring, decking boards, skirting backing |
| 5.0 × 50mm | 200 | APX5050 | Heavy-duty flooring, stud wall framing |
| 5.0 × 70mm | 100 | APX5070 | Joist fixing, heavy decking, framing connections |
| 5.0 × 80mm | 100 | APX5080 | Deep substrate fixing, thick timber connections |
| 5.0 × 100mm | 100 | APX50100 | Structural timber fixing, beam-to-post connections |
| 6.0 × 150mm | 100 | APX60150 | Heavy structural connections, large section timber |
Suitability Guide:
The MAXfix APX Premium Chipboard Screws are suitable for:
- Tongue-and-groove chipboard flooring installations
- MDF and plywood sheet fixing to timber framing
- First fix carpentry including stud wall framing, floor joists and roof truss bracing
- Second fix joinery including skirting board backing, architrave fixing and trim work
- Decking subframe construction fixing joists
- Kitchen and bathroom installations fixing cabinets, worktop supports and wall battens
- Stairs and balustrade fixing treads, risers and handrail brackets to timber structures
- General construction timber-to-timber connections where countersunk flush fixing is required
Recommended Screw Selection by Application - APXMPS
| Application | Recommended Size | Rationale |
|---|---|---|
| 22mm Chipboard Flooring to Joists | 4.0 × 40mm or 4.0 × 50mm | Adequate penetration into joist (minimum 25mm) with sufficient thread engagement |
| 18mm MDF or Plywood to Framing | 4.0 × 30mm or 4.0 × 40mm | Prevents over-penetration while ensuring flush finish |
| Decking Boards (25–32mm) to Joists | 4.0 × 50mm or 5.0 × 50mm | Countersunk head sits flush, adequate joist penetration |
| Stud Wall Framing (38mm Timber) | 5.0 × 70mm or 5.0 × 80mm | Provides structural connection through full timber thickness |
| Joist Hangers & Structural Connections | 5.0 × 80mm or 5.0 × 100mm | High holding power for load-bearing applications |
| Beam-to-Post Connections (Heavy Section) | 6.0 × 150mm | Maximum thread engagement for structural integrity |
Application Suitability Table - APXMPS
| Material / Application | Suitability |
|---|---|
| Chipboard Flooring to Joists | ✓ |
| MDF & Plywood Sheet Fixing | ✓ |
| Softwood Timber Framing | ✓ |
| Hardwood Joinery (With Pilot Holes) | ✓ |
| Tongue & Groove Flooring | ✓ |
| Decking Subframes (Covered) | ✓ |
| Kitchen & Bathroom Installations | ✓ |
| First & Second Fix Carpentry | ✓ |
| Skirting Board Backing & Trim | ✓ |
| Stair Treads & Risers | ✓ |
| Cabinet & Worktop Fixing | ✓ |
| Interior Partition Walls | ✓ |
| Engineered Timber Products | ✓ |
| Treated Timber (Interior/Covered) | ✓ |
| Masonry or Concrete Substrates | ✗ |
| Metal-to-Metal Fixing | ✗ |
| Fully Exposed Exterior (Requires Stainless) | ✗ |
| Marine or Permanently Wet Environments | ✗ |
| Load-Bearing Structural Steel Connections | ✗ |
Usage Guide:
Before Use
- Select screw length ensuring penetration into substrate is at least 2/3 of screw length for adequate holding power.
- Use PZ2 Pozidriv driver bits (not Phillips) for correct engagement and to prevent cam-out.
- For hardwoods, dense timbers or screws within 50mm of board edges, pilot drilling may still be required despite the Type 17 point.
- Ensure materials are properly aligned before driving screws, as the reamer effect makes backing out and repositioning more difficult.
- Check timber moisture content is appropriate for the screw finish. YZP is suitable for interior use but not for permanently wet or marine environments.
During Use
- Drive screws perpendicular to the surface to ensure the reamer clears the countersink hole correctly.
- Use consistent torque settings on impact drivers to avoid over-driving and sinking screw heads below the surface.
- Allow the Type 17 point to self-cut rather than forcing the screw, which prevents thread damage and reduces splitting risk.
- Space screws according to structural requirements but avoid over-fastening, which can weaken chipboard substrates.
- For flooring applications, ensure subfloor joists are level and dry before fixing to prevent material movement after installation.
Storage
- Store screws in original packaging in a dry location to prevent corrosion of YZP finish.
- Keep boxes sealed to prevent contamination with dust or moisture that may affect screw performance.
- Rotate stock to use older inventory first, particularly in humid environments where zinc plating may deteriorate over time.
Do I still need to drill pilot holes with Type 17 screws?
Not usually. The Type 17 slash point self-cuts into softwoods, chipboard and MDF without pre-drilling. However, pilot holes are recommended for hardwoods, dense timbers, screws within 50mm of board edges, or when fixing near the end grain.
What does the anti-jacking reamer actually do?
The reamer clears wood fibres from the countersink hole as the screw drives home, which allows the screw to pull the top material down tightly rather than jacking it upwards. This eliminates gaps between flooring and joists that cause squeaking.
Why Pozidriv and not Phillips?
Pozidriv (PZ2) provides deeper engagement and prevents cam-out under high torque, particularly when using impact drivers. Phillips heads will appear to fit but will cam out and damage both the bit and screw head. Always use PZ2 Pozidriv bits.
Are these suitable for exterior decking?
YZP finish is suitable for covered exterior applications like decking subframes under boards, but not for fully exposed decking screws. For exposed exterior use, specify stainless steel screws with A2 or A4 grade corrosion resistance.
What length screw do I need for 22mm chipboard flooring?
Use 4.0 x 40mm or 4.0 x 50mm. The screw should penetrate at least 25mm into the joist for adequate holding power, so a 40mm screw provides minimum engagement while a 50mm screw offers additional security.
Can I use these in an impact driver?
Yes. The double countersunk head with 6 ribs is specifically designed to handle high torque from impact drivers without shearing. However, use consistent torque settings to avoid over-driving and sinking heads below the surface.
What does BS EN 14592 certification mean?
BS EN 14592 confirms the screws meet European standards for timber structure fasteners. This provides documented compliance for structural applications and building control submissions where fastener specifications must be verified.
Why buy fixings from CMT Group?
CMT Group stocks the complete MAXfix fastener range in trade box quantities, which means you can consolidate your fixings supplier rather than sourcing from multiple outlets. We hold sufficient UK stock for bulk orders and same-day dispatch when urgent site supply is needed, eliminating delays from backorders or import lead times.
Our EDGE portal allows site managers to requisition fixings directly with budget controls and approval workflows, so you avoid purchase order delays while maintaining spending visibility across multiple projects. All fasteners are supplied with technical datasheets including load data and material compatibility charts for structural compliance documentation. Additionally, our trade desk understands the difference between Type 17 and twin-thread screws, YZP and A2 stainless finishes, and when reamer features are required versus standard countersunk heads, so you receive specification support rather than just order-taking. For projects requiring branded packaging or bespoke box quantities, our procurement team can arrange direct manufacturer liaison.
