Delta Multi-Purpose Woodscrews

Delta Multi-Purpose Woodscrews are high-performance, trade-grade screws designed for
fast, reliable fixing in softwood, hardwood, MDF, chipboard, plywood and plastic plugs. With a
sharp, self-cutting point, deep twin thread and countersunk Pozi head, these
multi-purpose woodscrews are ideal for general construction, joinery, carpentry and maintenance
on site and in the workshop.

Delta Multi-Purpose Woodscrews are engineered as a go-to, all-round fixing solution
for trade and DIY users. Manufactured from hardened, high-quality steel with a protective
plated finish (commonly zinc or zinc & yellow passivated – check pack for exact finish), they are
designed to deliver:

• Smooth, low-torque driving,
• High pull-out resistance in timber and plugs, and
• A neat, flush countersunk head that can be easily filled or left visible.

The self-cutting tip and aggressive twin-cut or single deep thread (according to size)
allow the screw to bite quickly into softwoods and many wood-based boards, often without the need for
pilot drilling. In hardwoods and dense materials, a pilot hole is recommended to prevent splitting
and ease driving.

These screws are suitable for use in:

• Softwood framing including C16/C24 structural carcassing (non-structural fixing role unless specified by engineer),
• General joinery in softwood and many hardwoods,
• Sheet materials such as MDF, chipboard, OSB and plywood, and
• Plastic wall plugs in masonry when used as part of a plug-and-screw system.

Typical Use Cases

• Timber framing & studwork – fixing studs, noggins and rails in internal partitions
  and light framing (C16/C24 softwood).
• Second-fix joinery – securing skirtings, architraves, door linings, casings and trims
  to timber or plugged masonry.
• Carcassing & furniture – assembling kitchen carcasses, wardrobes, shelving units,
  cabinets and general built-in furniture.
• Board fixing – fixing MDF, plywood, OSB and chipboard to battens, joists or frames.
• Plug & screw fixings in masonry – used with appropriate wall plugs for
  brackets, battens, frames and hardware on brick and block walls.

Installation & Application Tips

• Choosing length & gauge:
  • General rule: aim for at least 2–3 × the thickness of the material being fixed as penetration into the backing timber.
  • Example: fixing 18 mm board to a stud – use approx. 4.0 × 40 mm or 4.5 × 50 mm screw depending on load and design.
• Pre-drilling:
  • In softwood and most boards, fixing can often be done without pilot holes.
  • In hardwoods and near edges, drill a pilot hole approx. 80–90% of the core diameter of the screw to prevent splitting and ease driving.
• Driving the screw:
  • Use the correct Pozi driver bit (typically PZ2 for common sizes) to avoid cam-out and head damage.
  • Drive at a steady speed; allow the screw to self-cut and countersink into the surface.
  • Stop once the head is flush or just below the surface – do not over-drive, especially in soft materials.
• Using with wall plugs:
  • Select the plug size to suit the screw gauge and drill diameter recommended for that plug.
  • Drill the masonry hole to the correct depth, insert the plug, then drive the Delta woodscrew through the fixture into the plug.
• Environment & corrosion:
  • Standard plated finishes are generally suitable for dry internal or sheltered applications.
  • For external or high-humidity environments, use variants specifically rated for those conditions (e.g. heavy-duty coated or stainless – check product options).

Technical & Performance Overview

Delta Multi-Purpose Woodscrews are designed as general-purpose construction and joinery screws.
For critical structural applications, screws must be selected and designed in line with BS EN 1995 (Eurocode 5)
and manufacturer load data; consult a structural engineer where necessary.

• Material: Hardened carbon steel.
• Finish: Typically zinc plated or zinc & yellow passivated for improved corrosion resistance in internal conditions (confirm finish on pack).
• Head type: Countersunk Pozi (PZ) head for flush fixing and good bit engagement.
• Drive recess: Pozi (commonly PZ2 for mid-range sizes; small sizes may use PZ1, larger PZ3 – check pack).
• Thread form: Coarse/deep wood thread (often single or twin-cut) for strong grip and fast installation in timber and plugs.
• Point: Sharp, self-cutting point to reduce the need for pre-drilling in softwoods and boards.
• Available sizes: Wide range of diameters (e.g. 3.0–6.0 mm) and lengths (e.g. 12–200 mm),
  depending on the specific product variant.
• Substrates: Softwood (including C16/C24), many hardwoods (with pilot drilling),
  MDF, chipboard, OSB, plywood and plastic wall plugs in masonry.
• Usage class: Typically suitable for internal dry environments (Service Class 1).
  For more exposed classes, use appropriate corrosion-resistant variants.
• Packaging: Supplied in trade boxes or tubs in various size and quantity combinations.

Delta Multi-Purpose Woodscrews Features & Customer Benefits

• True multi-purpose performance
  One screw family handles framing, joinery, board fixing and plug fixings, reducing the
  number of different screw types needed on site.
• Fast, efficient installation
  Sharp tips and efficient thread design allow quick start and drive, saving time on repetitive tasks.
• Reliable holding power
  Hardened steel and deep thread geometry deliver strong pull-out resistance in timber and plugs,
  giving confidence in everyday fixings.
• Neat, flush finish
  Countersunk Pozi heads sit flush with the surface and can be filled or over-painted for
  a clean appearance on visible joinery.
• Trade-friendly packaging
  Available in convenient bulk packs and popular size assortments to suit builders, joiners,
  shopfitters and maintenance teams.

Frequently Asked Questions – Delta Multi-Purpose Woodscrews

1. Can I use Delta Multi-Purpose Woodscrews in structural C16/C24 timber?

Yes, Delta Multi-Purpose Woodscrews can be used to fix into C16/C24 softwood studs, joists and rafters
for general construction and carpentry work. However:

• For structural design (load-bearing joints), fasteners must be selected and sized in accordance
  with Eurocode 5 (BS EN 1995) and manufacturer load data.
• Always follow the guidance of a structural engineer or system designer for safety-critical connections.

2. Do I always need to drill pilot holes?

Not always:

• In softwoods and most board materials, these screws can commonly be driven without pilot holes.
• In hardwoods, near edges or in end grain, pilot holes are recommended to avoid splitting and reduce driving torque.

3. Are these screws suitable for outdoor use?

Standard plated Delta Multi-Purpose Woodscrews are generally intended for internal or sheltered environments.
For external use:

• Check if a heavier-duty coated or stainless steel variant is available and specified for outdoor conditions.
• Always follow relevant codes for corrosion resistance in your service class (e.g. decks, external cladding, fences).

4. What driver bit should I use?

Most common Delta Multi-Purpose Woodscrew sizes use a Pozi PZ2 recess. Smaller diameters may use PZ1,
and larger gauges PZ3. Always:

• Use the correct Pozi bit size for the screw head, and
• Ensure bits are in good condition to minimise cam-out and head damage.

5. Can these screws be used with wall plugs in masonry?

Yes. Delta Multi-Purpose Woodscrews are well suited as the screw component of plug & screw fixings
in masonry:

• Select the correct plug size for the screw gauge (e.g. red, brown plugs etc.).
• Drill the correct masonry hole diameter and depth, insert the plug, then drive the screw through
  the fixture into the plug.

6. Common Uses & How to Use Delta Multi-Purpose Woodscrews

Common Uses:

• Fixing battens, studs and noggins in timber framing.
• Securing skirting, architrave, door linings and window boards.
• Assembling kitchen units, wardrobes, shelving and general furniture.
• Fixing sheet materials (MDF, ply, OSB, chipboard) to timber or battens.
• General plug & screw fixings into masonry with appropriate wall plugs.

How to Use – Step-by-Step:

1. Select the correct for your materials and required embedment.
2. Where necessary (hardwoods/near edges), drill pilot holes of suitable diameter and depth.
3. Position the components to be fixed and clamp or hold securely.
4. Fit the correct Pozi driver bit into your drill/driver and set an appropriate clutch/torque setting.
5. Drive the Delta Multi-Purpose Woodscrew until the head is flush or just below the surface.
6. For visible joinery, fill or cap the head if a hidden fixing is desired, then sand and finish as required.