How To Choose The Right Screw

Project Overview

Find out which screw is right for your project. Once you know what each screw does, discover which driver bit best suites your fixing requirements.

Step by Step Instructions

1 Overview of screw types
2 Treated pine screws
3 Chipboard screws
4 Buggle batten screws
5 Decking screws for fixing to timber
6 Timber screws for fixing to timber
7 Multi use screws
8 Plasterboard screws
9 Roofing screws
10 Roofing screws
11 Metal screws
12 Sheet metal screws
13 Choose the right driver bit
14 Choose the right screw finish
  • Step 1. Overview of screw types

  • Step 2. Treated pine screws

    • Offers protection against chemicals present in treated pine.
    • Sharp, hardened, non slip point.
    • Ribbed, countersunk head.
    • Finishes:
        •     Galvanised
        •     Tufcote
        •     Climacoat

    Application: fixing treated pine or soft materials to timber for a flush finish where extra corrosion protection is needed. EG: Fixing treated pine timber, lattice panels and treated log.

  • Step 3. Chipboard screws

    • Ribbed, countersunk head design helps remove chipboard particles when countersinking
    • Course thread and fi ne shank provides maximum grip
    • Needle point
    • Ribbed, countersunk head.
    • Finishes:
        • Gold passivated zinc (GP) coating – Internal
        • Zinc Plated – Internal

    Application: fixing chipboard or soft materials to timber for a flush finish EG:Assembling kitchen cabinets, pine and chipboard furniture, boxes and crates. Fixing cement sheets, hardboard underlay, mouldings and timber trims.

  • Step 4. Buggle batten screws

    • Offers protection against chemicals present in treated pine.
    • Sharp, hardened, non slip point.
    • Ribbed, countersunk head.
    • Finishes:
        • Galvanised – external
        • Tufcote – external
        • Climacoat – external.

    Application: fixing treated pine or soft materials to timber for a flush finish where extra corrosion protection is needed. EG: Fixing treated pine timber, lattice panels and treated log.

  • Step 5. Decking screws for fixing to timber

    • Square drive, countersunk rib head
    • Sharp drill point
    • Type 17 self drilling
    • Finishes:
        • Climacoat – external
        • Stainless steel 302 – external
        • Stainless steel 316 – external
    • Application:

    • Approximately 6 screws per lineal metre of decking. 50mm screws for hardwood joists and 65mm screws for treated pine joists.
    • For fixing deckings into hardwood and treated pine joists. To avoid splitting, pre drill and pre countersink decking first.
  • Step 6. Timber screws for fixing to timber

    • Countersunk head
    • Finishes:
        • Zinc plated – internal
        • Brass plated – internal
        • Florentine bronze – internal
        • Galvanised - external
        • Stainless steel 302 – external

    Application: fixing into soft woods, hinges, brackets, metal fittings, plywood and particleboard.

  • Step 7. Multi use screws

    • Has various heads that include button head, panhead, and bugle head.
    • Finishes:
        • Gold passivated – internal
        • Galvanised – external

    Application: suitable for fixing thin metal sheet to timber or steel. EG: Fixing sheet metal, garden shed signs and hardware fitting.

  • Step 8. Plasterboard screws

    • Bugle head design, prevents face paper tearing during drilling
    • Needle point
    • Finishes:
        • Zinc gold – internal
    • Application:

    • Fixing to timber or thin steel.
    • 25mm long for walls and 30mm long for ceilings.

    EG: Fixing plasterboard walls, ceilings and partitions.

  • Step 9. Roofing screws

    • Easy to drill on a steep sloping roof or near the edge of sheeting
    • Eliminates crest sliding
    • Includes seal
    • Finishes:
        • Galvanised – external

    Application: fixing various metal roofing profiles such as corrugated and ribbed to timber and metal battens.

  • Step 10. Roofing screws

    • Pre drills expansion hole required for polycarbonate roofing
    • Hex head drive
    • Includes EDPM washer
    • Finishes:
        • Galvanised – external

    Application: fixing polycarbonate roofing to timber and metal battens.

  • Step 11. Metal screws

    • Head styles include hex, wafer, countersunk, self-embedding and button
    • Available with or without wings
    • Finishes:
        • Zinc gold – internal
        • Galvanised – external
    • Application:

    • Fixing to metal for a flush finish
    • Fixing hinges, brackets, timber trim, assembling gates and furniture. Use winged screws when fixing thick, soft building materials.
  • Step 12. Sheet metal screws

    • Pan head design provides an exposed, low profile finish.
    • AB point
    • Recommended to install using a screw driver
    • Finishes:
        • Zinc plate – internal
        • Stainless steel 302 – external
    • Application:

    • Fixing to timber or thin metal (up to 0.8mm thick) for an exposed head finish.
    • Suitable for fixing electrical fittings (ie: mounting blocks, light switches & alarms), sheet metal, garden shed construction, signs, plastics or metal fittings.
  • Step 13. Choose the right driver bit

    Slotted Phillips Head Phillips Head Hex Drive Head Square Drive Head Hexagon Head

    Slotted Phillips Head

    Phillips Head

    Hex Drive – Internal

    Square Drive – Internal

    Hexagon Head

    Suitable for both a phillips head and standard slotted screwdriver or bit Phillips head screwdrivers and phillips head driver bits Allow high speed fastening, normally 5mm internal hex bit High speed fastening with cordless drill, normally a No2 square drive 8g – 1/4” Hex socket 10/12g – 5/16” Hex socket 14g – 3/8” Hex socket
  • Step 14. Choose the right screw finish

    Zinc Plate or Gold Passivated (Interior):

    • 3-5 microns of thin zinc protective coating primarily for all interior (inside use) and protected undercover (external use)
    • Not for use with treated pine

     


     

    Galvanised and Climaseal (Exterior):

    Galvanised Class 3 - (C3 or Galvanised): 25 microns of tin/zinc galvanising for general outdoor and exterior use
    Climaseal 3 - (Class 3 Galvanised): Includes a Climaseal (protective) coating for outdoor and exterior use
    Climaseal 4 - (Class 4 Galvanised): Includes multiple Climaseal (protective) coatings for heavy and severe corrosive areas

     


     

    Climacoat and Tufcote (Exterior):

    • Specifically designed for use with treated pine timbers to stop the chemicals in the treated pine from attacking the zinc coating of the fastener.

     


     

    Colorbond ® (Exterior):

    • A durable coating on the heads of fasteners and cyclone plates. Provides optimum colour matching to coloured roofing or cladding.
    • UV resistant, won’t crack or split

     


     

    Stainless Steel 302/304 Grade (Exterior):

    • For exterior, mild marine, urban and rural environments

     


     

    Stainless Steel 316 Grade (Exterior):

    • For extreme marine environments within 200m of saltwater coastlines or underwater environments

     


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Please make sure you use all equipment appropriately and safely when following the advice in these D.I.Y. videos. You need to be familiar with how to use equipment safely and follow the instructions which came with the equipment. If you are unsure, you may feel it is safest to consult an expert, such as the manufacturer or an expert Bunnings team member.

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