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+86 13143444311
Email：sst@szsst88.com
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Address：Building 9, First Industrial Zone, Tantou Industrial City, Songgang Street, Baoan District, Shenzhen 518105, Guangdong, China
Type:Flat Head Torx Machine Screws
Materials:Steel
Surface treatment:Nickel Plated
Head Type:Flat Head
Drive:Torx Recess
Thread:Machine Thread
Point:Blunt
Forming:Single Die Heading
Size:M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M14
Number:202
We make flat head Torx machine screws in nickel plated steel, a countersunk head with a six-lobe recess and a machine thread, quoting them from M1 to M14 to the ISO form. Cone angle, head, recess and finish come from your drawing, and the first article is fitted and driven in your own panel.
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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.
Flat head Torx machine screws are countersunk machine screws driven through a six-lobe star recess, supplied here in nickel plated steel. The cone seats in a countersink so the head finishes flush; the star recess takes the drive without climbing out. The family is quoted from M1 to M14 with Number 202, to the ISO proportions for a countersunk machine screw.
Flat head. A 90-degree cone under a flat top face, sitting inside the panel rather than on it.
Torx recess. Six lobes with near-parallel flanks, carrying the bit on the walls of the recess.
Machine thread. A rolled thread for a tapped hole or a nut, ending in a blunt chamfer.
Nickel plated. A thin bright barrier deposit, chosen for appearance and adequate indoors.
In use flat head Torx machine screws with this finish are chosen for a visible panel that is opened occasionally, where a flush face and a bright finish matter more than weather resistance.
A countersunk head is the worst place on a screw for a decorative coating. The cone is in permanent contact with the panel and is scraped as the head seats; the top face is what everyone sees; and the recess is where a driver works. Nickel is a thin barrier deposit, so a slip of the bit takes the plate off and leaves a bright patch exactly where the eye goes. That is why the drive matters as much as the finish on this part.
A Torx recess protects the plating better than a cross. A Phillips bit is designed to cam out, and every cam-out drags across the recess and the face around it; a star bit stays engaged on the lobe walls, so the drive happens without the scraping. On a flush nickel head that difference is the difference between a fixing that still looks new after service and one with a bright scratch across it.
The cone under the head is the other wear point, and no drive can protect it. When the head seats, the cone presses against the countersink and the plate wears through at the contact line; that is where red rust starts on a nickel plated countersunk screw, and it starts on the underside where nobody sees it until the panel comes off.
The flush line is the reason to accept those risks. A countersunk head closes the hole and leaves nothing above the surface, which on a visible panel is the difference between a finished product and one with a row of bright domes on it. Nickel is chosen because it reads as a bright silver fixing; where the panel is painted, the same geometry in a plated zinc version is cheaper and slightly more forgiving.
Stainless is the answer where the joint is exposed. The countersunk geometry does not change; what changes is that the cone and the recess are the alloy itself, so there is no plate to wear through and no bright patch after a scratch.
The recorded range is M1 to M14, covering M1, M2, M3, M4, M5, M6, M7, M8, M9, M10 and M14. Custom lengths up to 2,000 mm are subject to DFM review after drawing submission. For flat head Torx machine screws the quotation carries head diameter and height, cone angle, recess size and depth, the thread and the finish, because the cone sets the seat and the recess sets the drive.
| Item | How it is defined | What we control |
|---|---|---|
| Head | Countersunk, 90-degree cone | Head diameter, height and cone angle |
| Recess | Torx, six-lobe star | Recess size and depth |
| Thread | Machine thread | Pitch and length, gauged per batch |
| End | Blunt, chamfered | Chamfer cut, not deburred |
| Finish | Nickel plated | Deposit thickness and adhesion |
| Length | Overall, head included | Measured on the shop plate |
Recess size should be on the drawing, because the two drives that are common on this head — Torx and Phillips — do not take the same bit and do not protect the finish equally. On a visible nickel head the star is worth specifying even if the customer’s line currently uses cross drivers, because the cost of a scratch on a flush face is higher than the cost of a bit.
Head diameter and cone angle should be quoted with the countersink rather than alone. A head at the small end of its range in a countersink at the large end leaves a visible ring, and on a nickel plated part that ring is the first thing anyone notices about the joint.
Three features define this part: the countersunk cone, the star recess and the nickel plate. The first buries the head, the second protects the finish while driving it, and the third is the appearance the part was bought for.
| Feature | What it gives | What it costs |
|---|---|---|
| Countersunk cone | Flush line, self-centring | Needs a matching countersink |
| Torx recess | Drive without scraping the face | Exact bit required |
| Nickel plate | Bright silver appearance | Fails at a scratch or a worn cone |
| Machine thread | Repeatable clamp in a tapped hole | Needs a nut or a tapped insert |
| Blunt end | Clean entry into a tapped hole | Will not cut its own thread |
The combination is aimed at a visible joint that is serviced more than once. A flush head, a drive that does not scar it, and a finish that reads as hardware: each of the three fails on its own if the other two are wrong, and together they are why this part exists in nickel rather than in plain zinc.
The limit is the finish itself. Nickel is a barrier coating: where it is broken there is no sacrificial metal to protect the steel beside it, and rust starts at the break. On a joint that will be outdoors the stainless version is the honest choice, whatever the appearance on the sample bench.
The recorded finish is nickel over carbon steel. On a countersunk head the deposit does two jobs that pull against each other: it gives the visible face its colour, and it sits between the cone and the countersink, where it will be worn by the act of seating. Neither is a problem on the first assembly; both show on a joint that is opened repeatedly.
| Option | How it protects | Effect on cone and recess | Typical use |
|---|---|---|---|
| Nickel plated | Barrier deposit, bright | Thin; bright scratch if worn | Visible indoor panels |
| White zinc | Sacrificial zinc, trivalent | Zinc protects beside a scrape | Indoor painted panels |
| Black zinc | Sacrificial zinc, dark | Thin; marks dark panels less | Dark equipment |
| Black oxide | Conversion film, oiled | No measurable build | Internal mechanisms |
| Stainless, plain | Passive chromium oxide film | Cone as cut | Outdoor and washdown |
The choice between nickel and zinc on a flush head is a choice about what a scratch means. On nickel, a scratch is a bright line on a finished face; on zinc, a scratch is protected by the surrounding zinc and stays grey. Where the face is seen, nickel wins on appearance; where the joint will be knocked about, zinc is the more forgiving finish.
Where the joint is exposed, neither is sufficient and the stainless version is the right part. The cone of a countersunk screw holds water against the panel, so the finish there has to survive being wet rather than being handled.
Three assemblies where flat head Torx machine screws are the fixing:
| Where it sits | The screw closes a panel where the head must be flush, the face is bright metal and the joint is opened for service. |
| When it goes wrong | A cam-out leaves a bright scratch on a flush face, and a worn cone starts rust under the panel. |
| Why it happens | The fixing is visible, it is serviced, and the panel is thin. |
| What we control | Cone and recess checked after plating, first article reviewed on the panel. |
| Where it sits | The screw fixes a cover where the fixing has to disappear and the finish is part of the appearance. |
| When it goes wrong | An over-driven head dents the panel and a plated cone wears through at the seat. |
| Why it happens | The face is flat, the cover is opened occasionally, and the part is indoors. |
| What we control | Plating adhesion checked, recess driven with the production bit. |
| Where it sits | The screw holds a plate where the head is on show and the surface is handled or cleaned. |
| When it goes wrong | Fingerprints and scratches on a bright face are the visible complaint. |
| Why it happens | The face is bright, it is cleaned, and the fixing is low. |
| What we control | Finish inspected under the agreed lighting, first article reviewed in place. |
Four reasons that matter on a visible flush fixing, each tied to what the drawing has to prove:
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Cone and recess agreed
The cone angle, head diameter and recess size are confirmed together, because the seat determines the flush line and the recess determines whether the finish survives the drive. Basis: Cone and recess agreed. |
Head, recess and plating in one route
The countersunk head and the star recess are formed in the heading stroke, the thread is rolled and the parts are nickel plated in the same route. Basis: One route with plating last. |
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Checked on the plated part
The first article is measured and driven after plating, because the deposit narrows the recess and lifts the cone by a few microns. Basis: First article checked after plating. |
First article fixes the setting
The first article fixes the wire, the cone die and the plating bath; repeat orders are compared against that record. Basis: First article signed off before the batch is released. |
Shi Shi Tong forms these flat head Torx machine screws from carbon steel wire on single-die headers that cut the countersunk head and the six-lobe recess in one stroke, rolls the machine thread to a blunt chamfered end and plates the parts in nickel. The first part of every run is measured on the head and cone, driven with the production bit and entered into a thread gauge before the batch continues.
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The cone die is the tool that decides how the part looks in the panel, and it wears at the rim. A worn die leaves a face that seats on the edge of the countersink instead of across the cone, so the head sits a fraction high and the seam catches light. On a nickel plated screw that seam is visible, which is why the cone is checked on the first article rather than left to the general head tolerance.
What decides whether flat head Torx machine screws pass is the cone, the recess, the thread and the plate. The inspection agreement covers those, and the criteria come from the drawing.
Cone and head on the projector |
Thread gauged per batch |
Hardness checked on the wire |
Salt-spray testing of the plate |
The cone is checked for angle and depth, the head for diameter and height, and the recess for size, depth and lobe condition; then the first article is driven with the production bit on the plated part. The thread is gauged per batch and the plate is checked for thickness and adhesion on the face, in the recess and on the cone.
A salt-spray sample is run where the environment asks for it. On a nickel plated countersunk screw the result is read at the cone, because that is where the coating is thinnest and where the joint holds water against it.
Every shipment of flat head Torx machine screws is traceable to the wire it was made from and to the plating batch. The grade and heat number are recorded on the material certificate supplied with the parts, and the plating record is kept with the inspection file.
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 plating. The documents carry the drawing revision and the batch number, so a repeat order is made to the same cone geometry and finish that were approved.
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 flush fixing the first article is fitted into the customer’s countersink and driven with their bit, because the seat and the finish are the function. 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 headers and the plating 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 |
Because a flush face shows every scratch. A star bit does not cam out, so the plating on the recess and the face survives the drive.
At the cone, yes. The cone is pressed against the panel when the head seats, and the plate wears at that contact line — the first place rust appears.
Over the whole screw, head included, because the head sits inside the panel.
No. It is a barrier coating, so a scratch or a worn cone starts rusting with nothing to protect it. Use stainless for exposed joints.
The cone and the countersink are not the same geometry, or the plating has lifted the cone. Both are visible faults rather than dimension errors.
Thread size and length, head diameter and height, cone angle, Torx recess size and depth, the finish, and the torque the joint will use.
How a flat head Torx machine screw project runs from drawing to repeat delivery:
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1
Send the drawing and the countersink it seats in
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→ |
2
Cone, recess and thread agreed
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→ |
3
First article fitted and driven in your panel
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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 length, the head diameter and height, the cone angle, the Torx recess size, the finish and the joint torque.
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Thread size
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Overall length
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Head diameter
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Cone angle
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Torx size
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Finish
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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
