Drywall Screw Bugle Phillips Head Coarse Thread
Coarse thread bugle head drywall screw for plasterboard onto timber studs.
Coarse thread is the timber answer. A deeper, wider thread pitch cuts into softwood and grips it, where a fine thread would simply carve a smooth channel and pull out under the weight of the board.
Everything else about the screw is the same as its fine thread sibling: the bugle head that sinks below the paper without tearing it, the Phillips recess, the C1022 wire with heat treatment. The one variable that has to be right is the thread, and it is set by what the stud is made of.
Why buyers choose it
- Coarse pitch bites and holds in softwood studs and battens
- Bugle head profile draws below the board face cleanly
- Same size ladder as the fine thread version for mixed-substrate jobs
- Grey phosphate as standard with the full finish range available
Send the stud material, the total board thickness and the finish and the size will be confirmed against the closest standard before quoting. Samples of this item are free of charge.
Specification
| Standard | DIN, ANSI and others |
|---|---|
| Size | 3.5~4.8mm, 6#~10# |
| Length | 10-180mm (3/8”- 7”) |
| Material | C1022+ heat treatment |
| Head Type | Bugle head, pan framing head, CSK head with ribs(type 17) |
| Drive Type | Phillips, square, torx and others |
| Screw Type | BSD, CSD |
| Finish | zinc plated(clear/blue/yellow)+wax, black/grey phosphate, nickel, Ruspert |
Specification as published by Haiyan Ehons Industrial Co., Ltd.. Diameters and lengths outside the ranges shown are quoted as non-standard items.
Technical detail
| Standard | DIN and ANSI references. |
|---|---|
| Size | 3.5 to 4.8 mm, #6 to #10. |
| Length | 10 to 180 mm (3/8 in to 7 in). |
| Material | C1022 with heat treatment. |
| Finish | Grey phosphate; zinc plated with wax, black phosphate, nickel and Ruspert also available. |
Problems this screw solves
Fine thread pulls out of timber
A fine pitch does not grip wood fibre. Coarse thread is not an upgrade, it is the correct part for the substrate.
Mixed substrates on one job
Timber studs at the perimeter and steel elsewhere is common. Stocking both thread forms from one supplier keeps the finish consistent.
Over-driving in soft timber
Coarse thread cuts quickly, so the head can bury itself. A nose cone sets the depth.
Where it is used
- Plasterboard onto timber stud partitions
- Board onto timber battens and counter-battens
- Ceiling board onto timber joists and firrings
- Renovation work in older buildings framed in timber
Who buys it
Drywall and carpentry contractors working in timber-framed buildings, and merchants who need to stock both thread forms side by side.
Quality control priorities
Thread crest sharpness is the check specific to the coarse thread form: a rolled crest that is flattened loses the bite the coarse pitch exists to deliver. Crest form is inspected on samples from each rolling run alongside pitch and major diameter.
Customisation
Length is the main variable for timber work, since the screw has to reach past the board into a useful depth of stud. Non-standard lengths and mixed-length pallets are both normal order patterns.
How it compares
Against the fine thread versions
Coarse for timber, fine for steel. That is the whole distinction and it is not negotiable.
Against a hi-lo thread screw
Hi-Lo is aimed at thin steel and at board itself; it is not the timber answer.
Against a wood screw
A wood screw is designed for structural timber joints. This is a board fixing screw that happens to go into timber.
Installation notes
Confirm the stud is timber
If in doubt, drive one screw and check. A fine thread in timber will spin immediately.
Set the nose depth
Coarse thread pulls in fast; without a depth stop the head goes through the paper.
Length reaches the stud
Allow a useful embedment past the board thickness rather than the minimum.
Keep phosphate screws dry
As with all phosphated fixings, damp storage produces surface rust before the screws are used.
Frequently asked questions
When do I use coarse thread?
What sizes are available?
What finish is standard?
What is the material?
Can I order mixed lengths in one shipment?
Do you supply free samples?
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View specificationQuote drywall screw bugle phillips head coarse thread
Minimum order 500 kg for this item.