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Address：Building 9, First Industrial Zone, Tantou Industrial City, Songgang Street, Baoan District, Shenzhen 518105, Guangdong, China
Type:Torx washer head self tapping screw
Materials:Carbon Steel
Surface treatment:Dacromet (zinc-aluminium flake coating)
Head Type:Pan Washer Head (integral flange)
Drive type:Six-lobe Torx recess (star)
Thread:Coarse single-lead self-tapping thread with sharp gimlet point
Process:Single-die heading, thread rolling, dip-spin Dacromet
Size:M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M14
Number:535
We manufacture torx washer head screws in carbon steel with an integral flange, a six-lobe Torx recess, a coarse self-tapping thread, a gimlet point and a Dacromet coating, quoted from M1 to M14. Flange diameter, recess, thread and coating are taken from your drawing.
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ISO 9001:2015 · Manufacturing since 1998 · 8,678+ customers · 89 countries and regions
Made to order – there is no stock catalogue. Each part is produced to your drawing, and production starts after drawing review and first-article approval.
A torx washer head screw is a self-tapping screw with an integral flange under the head and a six-lobe Torx recess on top. The recorded item on this page is a carbon steel screw with a Dacromet coating, a coarse self-tapping thread and a sharp gimlet point, quoted from M1 to M14 with Number 535.
Washer head. The flange is formed with the head, so the bearing area is wider than a plain pan head and there is no separate washer to drop. On thin or soft material that is what stops the head pulling in.
Torx recess. Six lobes give a large contact area, so the bit stays seated and the recess takes more torque than a cross of the same size. On a self-tapping screw that matters because the driving torque climbs quickly as the thread bites.
Gimlet point. Sharp and on centre, so the screw starts its own hole in timber, board or moulded plastic and begins cutting immediately.
Dacromet coating. A zinc-aluminium flake layer, cured rather than electroplated. It protects outdoors, it does not introduce hydrogen into the steel, and it is thin enough to leave the thread form intact.
Together these decide the joint: the flange spreads the load, the Torx takes the drive, the gimlet point starts the hole, and the Dacromet keeps the screw from rusting in wet service. That is why a torx washer head screw is specified by head, recess, point and coating together.
The body of this torx washer head screw is carbon steel wire, with the grade and heat number kept with the batch record. The property class is fixed on the drawing, because it decides the driving torque the head can take and whether the coated part needs a bake.
The head and the flange are upset in one operation on a single-die header. Forming them together is what keeps the flange concentric with the thread; a pressed-on washer would sit off centre and the head would load one side of the panel.
The Torx recess is formed in the same stroke. Its depth is matched to the head height so the six lobes engage the bit fully without breaking into the bearing face, and the recess is checked with the matching bit rather than a gauge alone.
The thread is rolled as a coarse single-lead self-tapping form, and the gimlet point is formed on centre. The thread start and the point together are the working end of the part: they decide how the screw enters and how much material it displaces.
The Dacromet is applied by dip-spin after the thread is rolled, then cured. The flake layer covers the flange face, the recess and the thread, and because it is applied after forming the thread form underneath is untouched.
Torx washer head screws of this type are quoted from M1 to M14; the recorded configuration covers that range in carbon steel with a Dacromet finish, an integral flange and a coarse self-tapping thread. Custom lengths up to 2,000 mm are subject to DFM review after drawing submission.
| Item | How it is defined | What we control |
|---|---|---|
| Head and flange diameter | The bearing area on the panel | Checked on the projector on the first article |
| Torx recess size | Which Torx bit the head takes | Checked with the matching bit |
| Thread form and pitch | The grip in the material | Gauged per batch |
| Point form | Gimlet point, on centre | Checked on the first article |
| Length | From under the head to the point | Measured on the shop plate |
| Coating | Dacromet film thickness | Checked on the sample and on the parts |
Each size is quoted against the material it enters. The flange diameter, the thread pitch and the thickness of the sheet, board or boss are reviewed together, because a thread that suits softwood strips a plastic boss and a flange that suits a board crushes a thin panel.
Length is measured from under the head to the point, and the flange diameter is measured across the bearing face. Both are stated on the drawing, because the flange is what decides whether the head covers the hole without a washer.
The Torx recess and the flange solve two different problems on the same part. The flange spreads the clamp load; the six-lobe recess keeps the bit in the head while the thread is cutting. Together they let a small screw drive into a material that resists, without the head deforming first.
| Feature | What it does | What goes wrong without it | What we control |
|---|---|---|---|
| Flange | Bearing area without a separate washer | A plain head pulls into soft material | Flange diameter checked on the first article |
| Torx recess | Holds the bit while torque climbs | A cross recess cams out and deforms | Recess checked with the matching bit |
| Gimlet point | Starts its own hole on centre | The screw wanders and the hole misplaces | Point checked on the first article |
| Dacromet | Outdoor protection without hydrogen | Plating embrittles and cracks at the point | Film checked on the sample |
Dacromet is the right finish for a self-tapping screw because it is applied as a flake layer rather than an electroplate. The coating moves with the steel as the thread cuts, instead of cracking away at the point, and the process does not generate the hydrogen that would embrittle a hardened screw.
The gimlet point suits timber, board and moulded plastic. In sheet metal the point and thread form are different, and the drawing should say so: a gimlet point in thin steel wanders, whereas a drill point cuts. The two are not interchangeable.
Coating thickness is the last check. A heavy Dacromet film fills the Torx recess and tightens the thread in a cored hole, so the film is specified and measured rather than left to the coating line.
This torx washer head screw is supplied with a Dacromet silver-grey finish. The coating is a zinc-aluminium flake layer cured onto the steel, so it protects sacrificially like zinc while staying thin enough that the recess and the thread keep their fit.
| Finish | How it protects | Effect on thread and recess | Typical use |
|---|---|---|---|
| Dacromet | Zinc-aluminium flake layer, cured | Thin film; thread and recess re-checked | Outdoor and wet service |
| Zinc plated | Sacrificial zinc layer | A few microns; gauged after | Indoor assemblies |
| Zinc nickel | Electroplated alloy layer | Thicker; thread re-checked | Wet industrial service |
| Black oxide | Conversion layer plus oil | No build-up | Indoor dark parts |
| Stainless (equivalent part) | Alloy provides protection | No coating | Wash-down and marine work |
Salt-spray exposure is agreed per project and written on the drawing. On a self-tapping screw the finish is judged at the point and the thread crests, because those are the surfaces that scrape, cut and wear as the screw enters.
Packing protects the points and the flange faces. The parts are bagged in counted quantities, labelled with the batch, the material heat and the bit size, and packed so the points cannot knock against each other and blunt.
Three assemblies where a flange head and a bit that will not slip are both needed:
| Where it sits | The screw fixes a coated panel or a trim board to a frame, with the flange bearing on the face and the gimlet point starting in the timber or composite behind. |
| When it goes wrong | A plain head pulls into the board, and a plated screw rusts at the point where the coating is scraped off by the cut. |
| Why it happens | The joint is outdoors, the material is soft, and the screws are driven by hand or with a driver. |
| What we control | Flange diameter and point checked, and the Dacromet film measured on the sample. |
| Where it sits | The screw joins duct sections, flanges and access panels where the sheet is thin and the driver reaches in at an angle. |
| When it goes wrong | A cross recess cams out at the angle and deforms, and a head that dishes the duct leaves a leak path. |
| Why it happens | The sheet is thin, the work is overhead, and the joint has to stay tight. |
| What we control | Torx recess checked with the bit, and the flange diameter matched to the gauge. |
| Where it sits | The screw closes a panel onto a moulded boss or a light frame where the flange spreads the load and the head is visible. |
| When it goes wrong | A head that crushes the boss lets the panel move, and a recess that strips cannot be re-driven on a line. |
| Why it happens | The parts are small, the joint is assembled at speed, and the finish is inspected. |
| What we control | Recess and flange checked, and the thread matched to the boss on the drawing. |
Four reasons that matter on a flange-headed self-tapping screw, each tied to what the drawing has to prove:
|
Flange, thread and material reviewed together
The flange diameter, the thread pitch and the material the screw enters are reviewed before the die is cut, so a screw that would crush a boss or strip is raised first. Basis: Flange, thread and material reviewed before tooling. |
Head, flange and point in one route
The head and the integral flange are formed together and the point is formed on centre, so the flange stays concentric with the thread. Basis: One route from wire to coated screw. |
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Recess and point checked on the part
The recess is driven with the matching bit and the point and flange are measured, on the first article. Basis: First article checked with the bit. |
First article to repeat production
The first article fixes the drawing revision, wire heat, die set and coating batch; repeat orders are compared against that record. Basis: First article signed off before the batch is released. |
Shi Shi Tong forms these torx washer head screws on a single-die header: the pan head and the integral flange are upset together and the Torx recess is formed in the same stroke, then the coarse self-tapping thread is rolled and the gimlet point formed. The parts are dip-spun with Dacromet and cured. The first part of every run is measured on the flange, driven with the bit and gauged on the thread before the batch continues.
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Between runs the die insert is changed to the drawing flange and recess, and the thread rolls to the pitch; the first part goes to the projector, to the bit and to the gauges. Because the coating is a batch dip, the first coated part is driven before the run is packed, so a recess that has filled with film is caught early.
What decides whether a torx washer head screw passes is the head and flange diameter, the Torx recess, the thread form, the point and the coating. The inspection agreement covers those, and the criteria come from the drawing.
Flange and point on the projector |
Thread gauged per batch |
Hardness testing against the property class |
Salt-spray testing of the Dacromet finish |
Each batch is recorded against the drawing revision: flange, recess and point from the first article, the thread gauged per batch, and the coating batch carried on the label. If the bit check or the flange measurement fails, the parts back to the last good setting are held and re-checked.
Where a third-party certificate is needed for the material or the finish, it is written into the drawing and filed with the batch record.
Every shipment of torx washer head screws is traceable to the wire it was made from. The grade, heat number and property class are recorded on the material certificate supplied with the parts, and the inspection records follow the criteria agreed on the drawing.
ISO 9001:2015 |
RoHS test report |
Registered trademark |
Patent: security screw and driver |
With each batch we supply the material certificate, the inspection record for the criteria on the drawing and, where it is listed, the third-party report for the material or the finish. The documents carry the drawing revision and the batch number, so the paperwork can be matched to the parts.
More than 8,678 customers in 89 countries and regions have ordered from Shi Shi Tong; 87% of orders come from repeat customers and 56% through referrals. Most projects follow the same route: drawing review, first-article approval, then batches checked against that sample. On a self-tapping part the first article is driven into a sample of the customer’s material, so the point, the thread and the flange are signed off in the work they hold. Buyers visit during the process to review samples and to see how the parts are headed and coated.
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8,678+
customers served
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87%
of orders from repeat customers
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56%
of orders through referrals
|
89
countries and regions shipped to
|
Buyers and quality engineers visit for sample review, process discussion and supplier audits; the visit is arranged around production so the header and the coating line can be seen on the day the parts run.
Customer group visit – sample review |
Customer group visit – process discussion |
Customer group visit – factory tour |
Customer visit – project kick-off |
Danish customer – drawing review |
Industry exhibition – meeting customers |
It is a self-tapping screw with an integral flange under the head and a six-lobe Torx recess. This one is carbon steel with a Dacromet coating and a gimlet point, quoted from M1 to M14.
Because the six lobes spread the load, the bit stays seated while the thread cuts and the driving torque climbs. A cross recess of the same size cams out earlier and deforms at the corners.
It gives a wider bearing area without a separate washer, so the head does not pull into soft material and there is nothing to drop during assembly.
A zinc-aluminium flake coating, cured rather than electroplated. It protects outdoors and does not introduce hydrogen into the steel, and it moves with the metal as the thread cuts rather than cracking at the point.
Timber, board and moulded plastic. For sheet metal the point and thread form are different, so that is a separate drawing rather than a variant.
Flange and head diameter, Torx recess size, thread form and pitch, point form, length and datum, material and property class, coating, and the material the screw enters.
How a torx washer head screw project runs from drawing to repeat delivery:
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1
Send the drawing or sample
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→ |
2
Flange, recess and thread review
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→ |
3
First article in the material
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→ |
4
Batch production and repeat orders
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Each step is confirmed with you before the next one starts; the drawing revision from the first article is what repeat orders are checked against.
For a quotation, send the drawing with the flange and head diameter, Torx recess size, thread form and pitch, point form, length and its datum, material and property class, coating, and the material the screw enters.
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Flange and head diameter
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Torx recess size
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Thread form and pitch
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Point form
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Length and datum
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Material and coating
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Sending a drawing? The form below does not take attachments. Email the PDF, DXF or STEP file to sst@szsst88.com with the part name and quantity in the subject line – the drawing is reviewed and a quotation follows.
+86 13143444311
sst@szsst88.com
