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:Metric Torx Socket Head Cap Screws
Materials:Carbon Steel
Surface treatment:Black Nickel Plated
Head Type:Cap Head
Drive:Torx six-lobe socket, punched in the head face
Thread:Metric machine thread, rolled 60 degrees, full to the head bearing face
Point:Blunt end with a small chamfer; no taper, no drill point
Forming:Single-die heading with socket punch, thread rolling, black nickel plating, sorting
Size:M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M14
Number:563
We manufacture metric torx socket head cap screws with a six-lobe star socket, a full metric machine thread and a cap head, in carbon steel with a black nickel finish. Head, socket size and depth, thread 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.
Metric torx socket head cap screws are cap head machine screws with a six-lobe star socket, sized to the metric thread system and finished in black nickel. The recorded item is carbon steel with a dark nickel plate, a full metric machine thread and a blunt end, quoted from M1 to M14 with Number 563.
Metric sizing. Diameter and pitch in millimetres — M3 × 0.5, M4 × 0.7, M5 × 0.8 — for a tapped hole or a nut. The pitch is part of the size and does not interchange with a fine pitch of the same diameter.
Cap head. A short cylinder with a flat top and a full flat bearing face, sized to sit in a counterbore. The head carries the clamp load over its whole width, and the flat top is where the socket is punched.
Star socket. Six curved lobes for a matching star bit. The drive has no sharp internal corners, so it takes more torque before it deforms than a hexagon of the same size and does not cam out the way a cross does.
Black nickel. A dark, hard plated finish. It is darker than bright nickel and glossier than black oxide, and it holds up better to handling than either — which is why it appears on visible equipment rather than on hidden joints.
Machine thread. A rolled thread for a tapped hole, with a blunt end. This is a machine screw, not a self-tapping one: the thread it engages already exists.
The cap head and the star socket are formed in one heading stroke, so the socket stays concentric with the shank. On a cap head that concentricity is what keeps the bit driving along the axis rather than tipping the head against the counterbore wall.
The socket depth is set against the head height. A socket that is too shallow bottoms out on the bit and rounds the lobes; one that is too deep cuts into the material that carries the head load. On a small cap head the wall between the socket and the outside is thin, and both numbers are checked together.
The thread is rolled from under the head to the end. Rolling work-hardens the flank and gives it a surface that gauges consistently, and it is what makes a metric torx socket head cap screw hold its thread in a joint that is opened more than once.
The end is blunt with a small chamfer, because there is nothing to start — the hole is tapped. The chamfer is what lets the first thread enter without catching on the lead-in.
Black nickel is applied last, over the head, the socket and the thread. It is a harder deposit than zinc and a darker one than bright nickel, and it adds a few microns, so the thread is gauged after plating and the socket is checked with the production bit in the same condition.
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; metric torx socket head cap screws run from instrument sizes to machine sizes, and the socket is what makes the small end usable.
| Item | How it is defined | What we control |
|---|---|---|
| Thread | Metric machine thread, rolled | Gauged per batch after plating |
| Head | Cap head, flat top, chamfered edge | Diameter and height on the projector |
| Socket | Torx six-lobe, sized to the thread | Checked with the production bit |
| Socket depth | Set against the head height | Checked on the section |
| End | Blunt with a small chamfer | Checked on the first article |
| Length | From under the head to the end | Measured on the shop plate |
The head height decides the counterbore, and on this part it also decides how much texture the black nickel has to cover. A tall head gives the plating a broad flat face and a clean edge; a short head leaves the chamfer doing most of the work, and that is where a dark finish shows unevenness first.
The socket size is what the assembly depends on. A star bit one size small will still enter and will round the lobes under load; one size large will not engage at all. The size is quoted with the thread and checked on the first article with the production bit.
Black nickel is a finish choice rather than a mechanical one, but on a socket head it has a mechanical consequence: the deposit sits inside the socket as well as on the head, and that is where it can do harm.
| Feature | What it gives | What it costs |
|---|---|---|
| Black nickel | Dark, hard, holds up to handling | A few microns; socket and thread re-checked |
| Cap head | Full flat bearing face, sits in a counterbore | Taller than a pan or countersunk head |
| Star socket | High torque without cam-out | Needs the matching star bit |
| Metric thread | Standard worldwide | Fine and coarse pitches do not interchange |
| Blunt end | Stops at the thread end | Cannot start in an unthreaded hole |
The finish is what separates this part from a plain stainless socket head. Black nickel is harder than zinc and darker than bright nickel, and it reads as a deliberate dark fixing rather than as a bright one that has been painted. On equipment where the socket heads are visible in a row, that tone is the reason for the specification.
The socket is the part that has to be watched. Nickel throws into a recess unevenly, and a socket that is a few microns tight after plating will not take the bit to full depth — and a star bit that sits high will mark the head before it drives anything. That is why the first article is driven with the production bit after plating rather than before.
The recorded finish is black nickel plating on carbon steel, applied after the thread is rolled. It is a hard, dark deposit that protects the steel and takes handling without showing every mark, which is what a visible socket head needs.
| Finish | How it protects | Effect on socket and thread | Typical use |
|---|---|---|---|
| Black nickel | Hard dark deposit | A few microns; socket re-checked | Visible dark equipment |
| Black oxide | Thin conversion film, oiled | Almost no change | Dry indoor assemblies |
| Black zinc | Zinc with black passivation | A few microns; gauged after | Dark panels, damp service |
| Bright nickel | Hard bright deposit | A few microns; socket re-checked | Visible silver fixings |
| Plain stainless | Alloy provides protection | No coating | Wash-down and coastal work |
The comparison that matters is with black oxide. Oxide is a conversion film that darkens the steel itself, so a scratch exposes bare steel; black nickel is a deposit over the steel, so a scratch exposes nickel and the steel is still covered. For a socket head handled with a key, that difference is what decides how the head looks after a year.
Where the joint is outdoors, black nickel is still not the right answer. It is a decorative finish on steel, and a socket that has lost its plating in salt air corrodes from the inside. A stainless version or a Dacromet coating is what an outdoor joint actually needs.
Three assemblies where a dark socket head is both seen and tightened hard:
| Where it sits | The screw holds a panel, a module or a rack ear on a black chassis, where the socket heads are visible in a row. |
| When it goes wrong | A bright head shows through a vent and catches the light on camera, and a soft dark finish marks on the first assembly. |
| Why it happens | The chassis is black, the fixings repeat, and the equipment is handled. |
| What we control | Socket and head height checked, tone matched to the sample, thread gauged after plating. |
| Where it sits | The screw clamps a jaw or a plate to a hardened body, where the head sits in a counterbore and the joint is tightened hard. |
| When it goes wrong | A socket that is too shallow rounds under torque, and a finish that fills the socket makes the key sit high. |
| Why it happens | The joint is tightened hard, the head is recessed, and the fixing repeats in a pattern. |
| What we control | Socket depth and head height checked, first article driven at joint torque. |
| Where it sits | The screw fixes a bezel or a plate where the head has to read as part of a dark panel and the joint is adjusted during setup. |
| When it goes wrong | A bright head breaks the panel line, and a cross recess cams out and marks a finished face. |
| Why it happens | The face is dark, the fixing is in a row, and the setting matters. |
| What we control | Head diameter and tone checked, socket driven with the production bit. |
Four reasons that matter on a plated socket head, each tied to what the drawing has to prove:
|
Socket and finish reviewed together
The socket size, the socket depth and the plating thickness are reviewed as one set, so a socket that will not take the bit after plating is raised first. Basis: Socket and plating reviewed as one set. |
Head, socket and thread in one route
The cap head and the star socket are punched in one stroke, the metric thread is rolled, and the black nickel is applied after rolling. Basis: One route from wire to plated screw. |
|
Socket and thread checked after plating
The socket is driven with the production bit and the thread is gauged in the plated condition, because the deposit changes both. Basis: First article checked after plating. |
First article to repeat production
Drawing revision, wire heat, die set, thread roll and plating 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 metric torx socket head cap screws on a single-die header that upsets the cap head and punches the six-lobe socket in one stroke, then rolls the metric thread to a blunt chamfered end. The parts are black nickel plated and sorted. The first part of every run is measured on the head and the socket, driven with the production bit and gauged after plating, before the batch continues.
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The socket punch and the plating are the two things that have to agree. A punch that is slightly worn leaves lobes the bit can rock in, and a deposit that is slightly heavy fills them; either alone is manageable, and together they make a socket that fails on the first hard drive. Both are checked on the first part, and the punch is changed on that evidence.
What decides whether metric torx socket head cap screws pass is the socket, the head, the thread and the finish. The inspection agreement covers those, and the criteria come from the drawing.
Head and socket on the projector |
Thread gauged after plating |
Hardness testing against the property class |
Salt-spray testing of the black nickel plate |
The socket is checked by driving the first article at the joint torque with the production bit and reading the lobes afterwards. A polished line along one flank is the earliest sign of a socket that is too tight after plating, and on a dark head it is also the first thing a customer sees.
The tone is checked against a retained sample, because black nickel varies between tanks more than bright nickel does. A head that reads brown or blue against the sample is a reject even if every dimension is correct — the finish is the specification on this part.
Every shipment of metric torx socket head cap 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 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 plating. 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 dark plated head the first article is approved as a colour sample as well as a part, and every batch is then compared with it. 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 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 |
Machine joints where the socket heads are visible on a dark chassis or panel and the joint has to be tightened with a star bit: audio and video equipment, machine fixtures and instrument panels.
Black nickel is a deposit over the steel, so a scratch exposes nickel rather than bare steel. It is also harder and holds up better to handling with a key.
Yes. It sits inside the socket as well as on the head, so the socket is checked with the production bit after plating rather than only gauged on the thread.
No. It has a blunt end and a machine thread, so it goes into a tapped hole or a nut.
The size that matches the thread, quoted on the drawing. A bit one size small rounds the lobes and the damage is hidden inside the head.
Thread size and pitch, head diameter and height, socket size and depth, length and datum, material, finish and the tone sample if one is set.
How a metric torx socket head cap screw project runs from drawing to repeat delivery:
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1
Send the drawing and the tone sample
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→ |
2
Socket and plating review
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→ |
3
First article driven and matched
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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, head diameter and height, socket size and depth, length and datum, material, finish and the tone sample if one is set.
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Thread and pitch
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Head diameter and height
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Socket size and depth
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Length and datum
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Finish
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Tone sample
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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
