Tel：
+86 13143444311
Email：sst@szsst88.com
Fax：+0086-755-27322278
Address：Building 9, First Industrial Zone, Tantou Industrial City, Songgang Street, Baoan District, Shenzhen 518105, Guangdong, China
Type:Stainless Steel Torx Head Screws
Materials:SUS
Surface treatment:Plain
Head Type: Cap Washer Head
Drive:Torx six-lobe recess (T-size matched to the thread)
Thread:Coarse single-lead self-tapping thread, rolled, full to the flange
Point:Sharp tapered point; no drill point, no flat end
Forming:Single-die heading with flange and socket, thread rolling, cleaning and passivation, sorting
Size:M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M14
Number:591
We manufacture stainless steel torx head screws with an integral washer head, a six-lobe star recess, a coarse self-tapping thread and a sharp point, in plain passivated stainless. Flange diameter and thickness, star size, point and length are taken from your drawing.
Watch the factory video·Email sst@szsst88.com
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.
Stainless steel torx head screws are self-tapping screws with a six-lobe star drive and an integral washer head, in a stainless alloy that survives weather and wash-down. The recorded item on this page is SUS with a plain passivated finish, a coarse self-tapping thread and a sharp point, quoted from M1 to M14 with Number 591.
Cap washer head. A low head with a wide integral flange whose flat underside is the bearing face. The flange spreads the load on a thin panel, and because it is formed with the head it cannot be forgotten or dropped.
Star drive. Six lobes with straight walls, driven with a matching star bit. The bit seats on six faces without a wedge angle, so it holds through the whole cut — which on a self-tapping screw is when the torque is highest.
Self-tapping thread. A coarse single-lead thread rolled from under the flange to the point. It cuts or forms its own thread in a prepared hole, so the joint needs no nut and no tapped hole.
Sharp point. A tapered point that starts in the hole and leads the thread in. It suits timber, board and plastics; in sheet metal the hole is drilled or punched first.
Stainless, plain. The alloy provides the protection, so there is no coating to blunt the thread crests or fill the star recess — and on a self-tapping screw the crest is the cutting edge.
The head, the integral flange and the star recess are formed in one heading stroke. That matters on this part: a flange formed separately could shift, and a recess formed after the flange could sit off centre, which on a wide head shows as the bit tipping the screw as it drives.
The flange is thin and wide. Thin lets it follow the panel and spread the load; wide puts the bearing area out where a thin sheet needs it. The trade is stiffness — a thin flange can dish under heavy torque — so the joint torque is set from the first article rather than from the thread size.
The thread is rolled from under the flange to the point, with a sharp crest, because that crest is what cuts or forms the hole wall. Rolling work-hardens the stainless flank, which on this alloy is what keeps the crest from folding over on the first turn.
The point is formed after rolling, so it has a clean taper. A blunt point skates across a coated panel instead of entering, and the mark it leaves is on the customer’s product rather than on the screw.
The parts are cleaned and passivated, and the recorded finish is plain. Passivation removes the embedded iron from the thread roots and the flange edge — the two places a stainless part starts to corrode first — without changing the geometry the drive depends on.
The family is quoted from M1 to M14, with M1, M2, M3, M4, M5, M6, M7, M8, M9, M10 and M14 in the recorded range. Custom lengths up to 2,000 mm are subject to DFM review after drawing submission; stainless steel torx head screws of this form are normally short, because the thread works in a panel rather than through a stack.
| Item | How it is defined | What we control |
|---|---|---|
| Thread | Coarse single-lead self-tapping, full length | Gauged per batch |
| Flange diameter | Wide, integral with the head | Measured on the first article |
| Flange thickness | Thin enough to follow the panel | Checked on the section |
| Recess | Torx six-lobe, sized to the thread | Checked with the production bit |
| Point | Sharp tapered point | Checked on the first article |
| Length | From under the flange to the point | Measured on the shop plate |
Length is measured from under the flange, because that is the face that bears on the panel. That is not the same as measuring from the face of the dome: the flange thickness is the difference, and on a shallow counterbore it decides whether the screw bottoms before the flange seats.
The flange diameter decides both the bearing area and the clearance. A wider flange covers an oversized hole and spreads load further; it also needs room around the head and leaves a wider footprint on a visible face. It is quoted with the head diameter rather than left to the standard.
A washer head and a star drive are a deliberate pairing: the head is chosen for bearing area, the drive for holding through the cut.
| Feature | What it gives | What it costs |
|---|---|---|
| Star recess | Drive holds through the cut, no cam-out | Needs the matching star bit |
| Integral flange | Bearing area without a loose washer | Cannot be changed after the batch |
| Self-tapping thread | Holds without a nut or tapped hole | Needs the right pilot hole |
| Sharp point | Clean start in wood, board and plastics | Not for sheet without a drilled hole |
| Plain stainless | No coating to blunt the crests | Galls against stainless |
The drive is the reason to choose this head with a star rather than a cross. A self-tapping screw spends its whole travel cutting, and the torque peaks exactly when the thread is working hardest — which is when a cross recess cams out and rounds the head. A star bit pushes down the axis and stays seated.
The flange is the reason to choose the washer head at all. On thin sheet a plain head bears on a narrow ring and the sheet dishes around the fixing; the flange spreads the same load over a wider face. On a stainless panel that difference is visible, because a dished panel catches the light.
Stainless brings its usual trade. There is no coating to fail and the part survives wash-down, but two clean stainless threads can gall, and on a stainless steel torx head screw the recess in a soft head will round before the thread fails. A bit that fits, and a dry film where the joint is stainless to stainless, are the practical answers.
The recorded finish is plain stainless, cleaned and passivated. On a self-tapping screw that is the practical choice: any coating on the thread crests blunts the cutting edge, and any coating in the star recess makes the bit sit high.
| Option | What it does | Effect on recess and thread | Typical use |
|---|---|---|---|
| Cleaned and passivated | Removes free iron after forming | No dimensional change | General and wet service |
| Satin bead blast | Even matte face on the flange | Edges softened slightly | Visible panels |
| Bright passivated | Cleaner, brighter surface | No dimensional change | Instruments and appliances |
| Electropolished | Levels micro peaks | Crests rounded a little; bite checked | Hygienic and chemical service |
| Dry film | Reduces galling in stainless joints | Film checked in the recess | Joints opened occasionally |
Passivation is the one treatment that can be added without touching the bite. It removes the embedded iron from the thread roots and the flange edge and leaves the geometry alone, so the first article does not have to be re-driven — which matters on a screw whose whole function is to cut.
A dry film is the exception, and it is worth specifying where the joint is stainless to stainless. It reduces galling, but a little of it reaches the recess, so the first article is checked with the bit after the film rather than before.
Three assemblies where a stainless tapping screw with a wide head does the job:
| Where it sits | The screw fixes a panel or a guard to a stainless frame where the flange spreads load on thin sheet and the joint is washed down between runs. |
| When it goes wrong | A plated screw rusts at the recess in a wash area, and a narrow head dishes the sheet and traps residue. |
| Why it happens | The equipment is stainless, it is cleaned daily, and the fixing is visible. |
| What we control | Grade and passivation recorded, recess driven with the production bit after passivation. |
| Where it sits | The screw closes a cover or fixes a bracket where salt air reaches the joint and the head sits on a thin skin. |
| When it goes wrong | A zinc plated screw corrodes from the first scratch, and a cross recess cams out during the cut and marks the finish. |
| Why it happens | The enclosure is exposed, it is serviced, and the face is seen. |
| What we control | Recess and flange checked, thread gauged per batch, first article driven in the sheet. |
| Where it sits | The screw fixes a cover, a bracket or a trim where the head has to spread load and the drive is automated. |
| When it goes wrong | A screw that needs many turns slows the line, and a head without a flange dishes a thin panel. |
| Why it happens | The panel is thin, the drive is by machine, and the fixing repeats. |
| What we control | Flange diameter and flatness checked, recess driven with the production bit. |
Four reasons that matter on a star-drive washer head, each tied to what the drawing has to prove:
|
Flange and recess reviewed together
The flange diameter and thickness, the star size and the point form are reviewed as one set against the panel, so a head that will not spread load is raised first. Basis: Flange and recess reviewed as one set. |
Head, flange and thread in one route
The head, the integral flange and the star recess are formed in one stroke, and the coarse thread is rolled to a sharp point. Basis: One route from wire to passivated screw. |
|
Recess and flange checked on the part
The recess is driven with the production bit, and the flange is checked for flatness and diameter on the first article. Basis: First article driven with the production bit. |
First article to repeat production
The drawing revision, wire heat, die set and thread roll are set at the first article and kept as the reference for later batches. Basis: First article signed off before the batch is released. |
Shi Shi Tong forms these stainless steel torx head screws on a single-die header that upsets the head, the integral flange and the star recess in one stroke, then rolls the coarse thread over the full length and forms the point. The parts are cleaned and passivated. The first part of every run is measured on the flange, driven with the production bit and driven into a sample of the customer’s material, before the batch continues.
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Two tools decide this part: the flange die and the star punch. A worn flange die leaves a head that is slightly thicker at one side, and a flange that dishes unevenly when driven makes the head lean; a worn punch lets the bit rock, and a bit that rocks marks the head before it drives. Both are checked on the first article, not assumed from the die record.
What decides whether stainless steel torx head screws pass is the flange, the recess, the thread, the point and the surface. The inspection agreement covers those, and the criteria come from the drawing.
Flange and head on the projector |
Thread gauged per batch |
Hardness testing of the wire |
Salt-spray testing where the service requires it |
The flange is checked by driving the first article into a sample panel and reading the contact ring and the flatness afterwards. A flange that is flat on the bench and dished after driving has told you the joint torque is above what that flange thickness will take.
The recess is checked by driving, not by looking. On a small stainless head the damage starts as a polish mark on the lobe edges before the head strips, and that mark is what the inspection looks for — on a star recess it is also the first thing that shows on a visible fixing.
Every shipment of stainless steel torx head screws is traceable to the wire it was made from. The grade and heat number 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. 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 washer head the first article is driven into a sample of the customer’s sheet, because the flange and the recess only prove themselves against the material they meet. Buyers visit during the process to review samples and to see how the heads are formed.
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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 passivation 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 |
Self-tapping joints into sheet, board and plastics where the joint is washed or outdoors and the head has to spread load on a thin face.
A tapping screw’s torque peaks while the thread is cutting, and a cross recess cams out at that point. A star bit stays seated through the cut.
A low head with an integral flange. The flange underside is the bearing face, so it spreads load without a separate washer and cannot be left off.
They can, especially stainless into stainless sheet. A dry film on the thread or a different alloy pairing are the usual answers.
A sharp tapered point for timber, board and plastics. In sheet metal the hole is drilled or punched before the screw goes in.
Thread size and pitch, flange diameter and thickness, star size, point form, length and datum, grade and finish.
How a stainless steel torx head screw project runs from drawing to repeat delivery:
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1
Send the drawing and a sheet sample
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→ |
2
Flange and recess review
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→ |
3
First article driven in the sample
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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 thread size and pitch, flange diameter and thickness, star size, point form, length and datum, grade and finish.
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Thread and pitch
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Flange diameter
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Flange thickness
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Star size
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Point form
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Length and grade
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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
