Drywall Screw Hi-Lo Thread Black Phosphate
Black phosphate hi-lo thread drywall screw for board onto thin steel framing.
Black phosphate is the traditional drywall finish, and it is not chosen for looks. The phosphate layer gives the driver bit more friction than a plated head does, which is why a fixer running several thousand screws a day notices the difference by mid-afternoon.
The hi-lo thread on this screw alternates a tall and a short thread, so it holds in thin steel stud and in board without needing the coarse thread that only works in timber. Together the two make this the standard high-volume partition screw.
Why buyers choose it
- Phosphate finish gives the bit grip and reduces cam-out on long runs
- Hi-Lo thread holds in light-gauge steel and in board alike
- 3.5 to 4.8 mm and #6 to #10 diameters, 10 to 180 mm lengths
- C1022 with heat treatment for consistent drive strength
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 | Black phosphate; zinc plated with wax, grey phosphate, nickel and Ruspert also available on this line. |
Problems this screw solves
Plated heads let the bit slip
Phosphate is rougher. On a repetitive run that is the difference between a full day and a day punctuated by cam-outs.
Coarse threads spin in steel stud
Hi-Lo gives the tall thread something to bite while the low thread carries the core.
Screws cost more than they need to
This is the plain-finish, high-volume member of the family. Where corrosion protection is not specified, there is no reason to pay for a coated screw.
Where it is used
- High-volume partition board fixing onto steel studs
- Ceiling board onto furring channel
- Dry interior work where a coated finish is not specified
- Concealed fixings beneath skim and tape finishes
Who buys it
Drywall subcontractors and board merchants buying the standard partition screw in container volume.
Quality control priorities
Recess depth is the check that matters most on a high-volume phosphate screw: a shallow Phillips recess will cam out regardless of how good the finish is. Depth is gauged through each run, with case hardness confirmed after heat treatment.
Customisation
Head style can be bugle, pan framing or ribbed countersunk, and the drive Phillips, square or Torx. For merchant packs, count-pack boxes are available instead of bulk cartons.
How it compares
Against the Magni coated hi-lo screw
Same thread, different protection. Use Magni where corrosion protection is specified; use black phosphate where it is not.
Against a fine thread drywall screw
Fine thread is the older answer for steel stud. Hi-Lo holds better in thin gauge.
Against a coarse thread drywall screw
Coarse thread belongs in timber studs and will spin in steel.
Installation notes
Use a depth-setting nose
A drywall gun nose cone sets head depth consistently and stops the head breaking the paper.
Do not specify phosphate for damp areas
Phosphate is a light protective layer, not a corrosion system. Wet rooms need a coated screw.
Keep cartons dry on site
Phosphated screws will surface rust in a wet carton. Store them off the slab.
Match the bit to the recess
PH2 in most sizes; confirm against a sample for the smaller diameters.
Frequently asked questions
Why is the screw black?
Is phosphate suitable for bathrooms and kitchens?
What thread form is hi-lo?
What sizes do you produce?
What is the material?
What is the minimum order?
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Minimum order 500 kg for this item.