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:Tiny Screws CD Pattern Stainless Steel
Materials:Stainless Steel
Surface treatment:Plain
Head Type:Csk Head
Drive:Phillips (cross)
Thread:Machine thread
Point:Blunt
Forming:Single Die Heading
Size:M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M14
Number:608
We make CD pattern screws in passivated A2 stainless, a countersunk head with concentric turned rings and a Phillips recess, quoting them from M1 to M14. Head, cone angle, ring pitch, recess and finish come from your drawing and an approved appearance sample.
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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.
CD pattern screws are small stainless countersunk screws whose flat top face is turned with concentric rings, driven with a Phillips bit and quoted here from M1 to M14 with Number 608. The rings are a decorative finish cut into the head, and on a countersunk screw that face is the part that stays visible once the screw is seated.
CD pattern. Concentric rings turned into the top face, finer than a machine finish and coarse enough to read as a pattern at arm’s length.
Countersunk head. A 90-degree cone underneath, so the screw finishes flush in a matching seat.
Phillips recess. A cross cut through the centre of the turned face, driven with a PH000 to PH0 bit.
Passivated stainless. A2 grade, uncoated, so the turned rings and the recess are as cut.
CD pattern screws are bought when the fixing is part of the design: the head is visible, the surface around it is finished, and an ordinary countersunk screw would look like a repair rather than a detail. The rings are the difference between a fastener and a feature.
A countersunk screw sits down into its seat until the cone bottoms. What is left at the surface is a disc of head face, and on standard countersunk screws that disc is plain. CD pattern screws are the same part with that disc turned into rings, which changes what the customer sees but not how the screw holds.
The rings have to be concentric with the recess, and that is the difficult part. The recess is cut into the face after it is turned, or the face is turned around a recess that is already there; either way the centre of the rings and the centre of the cross must be the same point. A few hundredths of eccentricity on a 2.4 mm head reads as a screw that is off-centre even when the seat and the hole are perfect.
The seat is the other half of the geometry and it is untouched by the pattern. The 90-degree cone has to remain clean and uninterrupted, because it is what carries the clamp load and what centres the screw; turning the top face must stop at the edge and not roll over onto the cone, and a decorative step that creeps onto the seat shows up as a screw that rocks.
The recess then has to be cut without raising a burr. A cross cut into a turned face leaves a feather at the edge of each arm, and on a mirror-like face that feather catches the light; it also stops the bit from seating fully, so the screw is driven on the burr rather than in the recess. Deburring the cross without polishing the rings away is the finishing step that decides whether the part looks right.
Finally the face is what gets handled. CD pattern screws show fingerprints more than a plain satin finish, and they show a scratch as a break in a ring rather than as a scuff. Packing them so that heads do not touch each other is part of delivering a decorative part.
The recorded range is M1 to M14, with M1, M2 and M3 covering the small electronics work where these screws are used. Custom lengths up to 2,000 mm are subject to DFM review after drawing submission. For CD pattern screws the quotation carries the head diameter, the ring pitch and depth, the recess size and the cone angle, because the face is the specification.
| Item | How it is defined | What we control |
|---|---|---|
| Head | Countersunk, 90-degree cone | Head diameter and cone angle |
| Face | Concentric turned rings | Ring pitch, depth and concentricity |
| Recess | Phillips cross | Recess size, depth and burr |
| Thread | Machine thread | Pitch and length, gauged per batch |
| End | Blunt, chamfered | Chamfer cut, not deburred |
| Material | A2 stainless | Grade and heat number on the certificate |
| Finish | Passivated, plain | Surface condition after turning |
Ring pitch on CD pattern screws is a cosmetic number and belongs on the drawing only where a sample has been approved. A fine pitch reads as a smooth bright face and shows a fingerprint; a coarse pitch reads as a machined detail and hides small marks.
Head diameter and cone angle are functional and should be quoted with the countersink in the part. A CD face on a head that does not match the hole is a decorative screw that stands proud.
Three features define the part: the turned face, the countersunk seat and the stainless body. The first is what it is bought for, the second is what makes the face visible, and the third means the pattern is bare metal that cannot be touched up.
| Feature | What it gives | What it costs |
|---|---|---|
| CD face | A finished look on a fixing | Eccentricity and burr both show |
| Countersunk head | Sits flush, face is the surface | Needs a matching seat |
| Phillips through the face | Standard drive | Burr at the cross edges |
| Passivated stainless | No coating to chip off the rings | Pattern cannot be repaired |
| Small size | Disappears into the product | Rings measured in hundredths |
The finished look is the whole point. On a device where the screws are visible beside a machined bezel, a plain countersunk head reads as an ordinary fastener and a CD face reads as part of the design, at a small fraction of the cost of a machined trim part.
The fragility is the price. Once the face is turned, nothing else can be done to it: no plating, no touch-up, no polishing after the recess is cut, because every later operation puts a mark across the rings.
The recorded finish is passivation on bare A2 stainless with the CD face cut before passivation. That order matters: the turning is the last geometric operation on the face, passivation only cleans and grows the oxide, and no coating is applied that could fill the rings or round the edge of the cross.
| Option | How it protects | Effect on the CD face | Typical use |
|---|---|---|---|
| A2 stainless, passivated | Passive chromium oxide film | Rings as cut, bright | Electronics and instruments |
| A4 stainless, passivated | Passive film with molybdenum | Rings as cut, bright | Marine and medical devices |
| Black PVD on stainless | Hard thin film | Rings preserved; colour to sample | Black and dark housings |
| Brass, plain | No protection needed indoors | Softer rings, warm tone | Decorative and audio |
Where the part has to be dark, PVD is the finish that keeps the rings: it is thin enough to follow the turning rather than fill it, and hard enough not to wear off the face in handling. Plating is the wrong answer, because the deposit fills the shallow grooves that make the pattern.
On a bare stainless face the colour is the alloy, so a batch that is passivated twice looks slightly different from one that is passivated once. Where several visible screws sit together, they are supplied from one batch and one passivation run.
Three assemblies where CD pattern screws are the fixing:
| Where it sits | The screw closes a housing or mounts a faceplate where the fixing is visible and reads as part of the surface. |
| When it goes wrong | An eccentric ring pattern or a burr at the cross makes the screw look wrong beside a machined bezel. |
| Why it happens | The part is visible, it is small, and it is inspected by eye. |
| What we control | Concentricity and burr checked under magnification on the first article. |
| Where it sits | The screw fixes a lens ring or a panel where countersunk screws are specified for a flush finish. |
| When it goes wrong | The decorative face is the only stainless surface, and a fingerprint or a scratch shows immediately. |
| Why it happens | The joint is flush, the face is handled, and appearance is specified. |
| What we control | Head and ring pitch matched to the approved sample; packing separates heads. |
| Where it sits | The screw closes a case back or a small housing where a machined-looking screw head is part of the product. |
| When it goes wrong | The pattern cannot be reworked, so a marked part has to be scrapped rather than polished. |
| Why it happens | The joint is visible, it is small, and the finish is the specification. |
| What we control | First article as the appearance standard; handling and packing controlled. |
Four reasons that matter on a decorative countersunk screw, each tied to what the drawing has to prove:
|
Ring pitch agreed on a sample
The ring pitch, depth and head diameter are fixed against a physical sample, because the pattern reads differently on a screen and on a 2 mm head. Basis: Pattern fixed on a physical sample. |
Turned, recessed, passivated in one route
The head is formed, the face is turned, the cross is cut and the parts are deburred and passivated in one route. Basis: One route from wire to finished face. |
|
Concentricity and burr checked
The first article is checked for concentricity between the rings and the cross, and for burr at the arm edges, under magnification. Basis: Concentricity and burr checked. |
Appearance sample kept
An approved appearance sample is kept with the drawing, so a repeat order is compared with the part the customer accepted. Basis: Appearance sample held per order. |
Shi Shi Tong forms CD pattern screws from A2 stainless wire on single-die headers that form the countersunk head, turns the top face with concentric rings, cuts the Phillips recess through the centre, rolls the machine thread and passivates the parts. The first part of every run is checked on the projector for head diameter and cone angle, and under magnification for ring concentricity and burr.
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Turning a face of a couple of millimetres is where the whole part is decided. The tool has to hold its edge across thousands of parts, because a worn edge leaves a ring that is deeper at one side than the other; the screw still measures to size, and the face no longer looks machined.
What decides whether CD pattern screws pass is the face, the recess, the cone and the thread. The inspection agreement covers those, and the criteria come from the drawing and from the approved appearance sample.
Cone and face on the projector |
Thread gauged per batch |
Hardness checked on the wire |
Salt-spray testing of the grade |
For CD pattern screws the cone is checked for angle and contact, the head for diameter, and the face for ring pitch, depth and concentricity with the recess. The recess is checked for depth and burr, the thread is gauged per batch, and the appearance is compared with the sample under the same light.
The first article is also seated in the customer’s countersink and viewed straight on, because concentricity that looks acceptable on a projector can read as off-centre when the screw is in the product and lit from above.
Every shipment of CD pattern screws is traceable to the wire it was made from and to the passivation 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 grade or the passivation. The documents carry the drawing revision and the batch number, and the approved appearance sample is kept with them.
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 decorative screw the first article is also the appearance standard. Buyers visit during the process to review samples and to see how the faces are turned.
|
8,678+
customers served
|
87%
of orders from repeat customers
|
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 turning station 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 |
It is decorative. The rings turn a plain countersunk head into a finished detail where the screw is visible.
No. The face is not loaded; the cone underneath carries the clamp load and sets the position.
On a 2 mm head a few hundredths between the rings and the cross reads as an off-centre screw, even when the seat is perfect.
No. Once the rings are turned and the recess is cut, any later polish crosses the rings. A marked part is scrapped.
Plating fills the shallow grooves. Where colour is needed, a thin PVD film keeps the pattern.
Head diameter and height, cone angle, ring pitch and depth, recess size, the grade and the approved appearance sample.
How a decorative screw project runs from drawing to repeat delivery:
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1
Send the drawing and a sample of the finish
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→ |
2
Ring pitch, head and recess agreed
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→ |
3
First article approved for appearance
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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 approved first article is both the dimensional and the appearance reference for repeat orders.
For a quotation, send the drawing with the head diameter and height, cone angle, ring pitch and depth, recess size, the grade and the finish sample.
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Head diameter
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Cone angle
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Ring pitch
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Ring depth
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Recess 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
