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 pan head machine screw with CD pattern
Materials:Stainless Steel
Surface treatment:Plain, passivated
Head Type:Pan head with turned CD face
Size:M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M14
Drive:Phillips cross recess
Thread:Machine thread, right hand
Forming:Cold heading; head face turned with CD pattern, thread rolled, then passivated
Number:272
We manufacture stainless steel pan head machine screws with a CD pattern turned into the head face, a Phillips recess and a machine thread, quoted from M1 to M14, plain and passivated. Head height after turning, pattern depth, recess and thread 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 stainless steel pan head machine screw is a machine screw with a low domed head, a flat bearing face and a stainless body. The recorded item on this page carries a CD pattern turned into the head face — a fine circular finish used on visible assemblies — with a Phillips recess and a machine thread, quoted from M1 to M14.
Pan head. A low dome with a flat bearing face underneath, wider than it is tall. It spreads the clamp load on a thin panel and leaves a smooth profile that does not catch on the next component.
CD pattern. Fine concentric turning marks cut into the top face of the head. It is a decorative finish: under light it reads as a bright circular sheen rather than a plain domed surface, and it is common on equipment where the fastener is deliberately visible.
Stainless body. The alloy carries the corrosion resistance, so there is no coating to fill the fine pattern or to chip at the head edge. That matters here more than on a plain head, because the pattern is the feature.
Machine thread. The thread engages a tapped hole, a nut or an insert, so the joint is designed around the mating thread rather than the screw forming its own.
Together these decide the part: the pan head gives a clean bearing face, the CD pattern gives the visible face its finish, the stainless body keeps the pattern crisp, and the machine thread holds the clamp. That is why a stainless steel pan head machine screw of this type is specified by head, pattern, recess and thread together.
The body of this stainless steel pan head machine screw is stainless wire, with the grade and heat number kept with the batch record. 304 is the default for indoor work and 316 where chlorides are present, and the grade is what the customer is left with once the decorative question is settled.
The pan head is formed in the heading die with its dome and bearing face. On this part the head is then the reference for the CD pattern: the pattern is turned concentric with the recess, so the two features line up when the screw is in place.
The CD pattern is produced by turning the head face. That is a second operation after heading, and it is why the pattern depth and the head height have to be specified together — the pattern removes material from the top of the dome, and a head that has been turned too deep leaves a thin wall around the recess.
The Phillips recess is formed in the heading operation and re-checked after the pattern is turned, because the turning operation is centred on it and any eccentricity shows as an uneven ring around the cross.
The parts are passivated after the pattern is turned. Passivation removes free iron left by the turning and restores the film, and it adds nothing to the pattern, so the fine circular marks stay as cut.
Stainless steel pan head machine screws of this type are quoted from M1 to M14; the recorded configuration covers that range in stainless with a CD pattern and a Phillips recess. Custom lengths up to 2,000 mm are subject to DFM review after drawing submission, because the head, the pattern and the thread are all set before the tooling is made.
| Item | How it is defined | What we control |
|---|---|---|
| Head diameter and height | The pan dome that bears on the panel | Checked on the projector on the first article |
| CD pattern | Depth and pitch of the turned face | Checked against the approved sample |
| Pattern centring | The ring running concentric with the recess | Checked on the projector |
| Phillips recess | Bit engagement after turning | Checked with the matching bit |
| Thread size and pitch | The fit in the tapped hole | Gauged per batch |
| Length | From under the head to the tip | Measured on the shop plate |
Each size is quoted against the surface it sits on. The head diameter, the counterbore or clearance and the pattern depth are reviewed together, because the pattern is only visible if the head stands clear of the panel rather than sitting in a deep pocket.
Length is measured from under the head, and the head height is stated after the pattern is turned. That distinction matters: a drawing that gives the head height of the blank, without allowing for the material the pattern removes, describes a part that no longer exists after the second operation.
The CD pattern is a finish, not a function. It changes how the head face reflects light: the fine concentric rings scatter a plain dome into a bright circular sheen, which is why it appears on audio equipment, appliance trim and instrument panels where the fastener is part of the look.
| Feature | What it does on this part | What goes wrong | What we control |
|---|---|---|---|
| CD pattern | Decorative concentric finish on the head face | A pattern cut too deep thins the head | Depth and pitch checked against the approved sample |
| Pattern centring | Rings concentric with the recess | Off-centre rings look like a defect | Checked on the projector |
| Head height | Clearance and dome profile | Turning removes height; the fit changes | Measured after the pattern is cut |
| Plain passivated finish | Keeps the pattern crisp | A coating would fill the fine marks | No coating applied; surface checked |
The pattern is also a handling risk. A turned face shows every mark, and a scratch cannot be polished out locally without breaking the concentric rings. That is why the parts are packed with the heads separated, and why the first article is compared against the sample under the same light the customer will use.
The recess has to survive the second operation. Because the turning is centred on the cross, an eccentric setup shows up as a ring that runs off one side of the head, and the recess itself can pick up a burr at the edge that stops the bit seating. Both are checked on the same first article, not on two different parts.
The bearing face is left flat. The pattern is on the top face only, so the head still seats on the panel as a pan head should; a pattern that ran over the edge would sit the head on its rim and defeat the bearing face.
This stainless steel pan head machine screw is supplied plain and passivated, with no coating. On a CD-patterned head that is not a cost choice: a plated or painted film would fill the fine turning marks, and the pattern that the customer is paying for would disappear under it.
| Finish | How it protects | Effect on the CD pattern | Typical use |
|---|---|---|---|
| Plain, passivated stainless | Passive film forms in air | Pattern stays as cut | Visible patterned heads indoors |
| Electropolished | Surface levelled, chromium enriched | Pattern softened; sample re-approved | Bright visible heads |
| Bead blasted | Uniform matte surface | Pattern removed | Where a matte face is wanted instead |
| Black oxide (stainless) | Chemical conversion, thin film | Pattern visible but darkened | Dark visible panels |
| Zinc plated (steel equivalent) | Sacrificial layer | Coating fills the fine marks | Steel screws without a pattern |
Salt-spray exposure is agreed per project and written on the drawing; plain stainless is tested in the condition it ships in. On a visible patterned part the finish question and the appearance question are the same question, which is why the sample is approved on the finished part rather than on a bare blank.
Packing is part of the finish on a CD-patterned screw. The parts are bagged in counted quantities, labelled with the batch, the material heat and the pattern batch, and packed so the heads are separated — a scuffed ring cannot be touched up without re-cutting the whole face.
Three assemblies where the head is meant to be seen:
| Where it sits | The screw fixes a panel, a grille or a chassis cover where the head sits on a brushed or anodised face and is part of the product look. |
| When it goes wrong | A plain head looks unfinished next to a machined panel, and a coated one chips at the recess and shows a bright ring. |
| Why it happens | The face is visible, the finish is specified, and the units are inspected for appearance. |
| What we control | Pattern depth checked against the approved sample, and the head face checked under the customer’s light. |
| Where it sits | The screw holds a trim strip or a control plate where the fastener is deliberately exposed on a stainless or coated face. |
| When it goes wrong | A scratched pattern cannot be polished out, and a head that sits too high breaks the visual line of the panel. |
| Why it happens | The part is cleaned regularly, the face is visible, and the assembly is inspected. |
| What we control | Pattern centring and head height checked, and the packing verified so the heads do not rub. |
| Where it sits | The screw closes an instrument case where the head sits in a shallow recess that is part of the mechanical design. |
| When it goes wrong | Turning off-centre leaves a ring that runs off the head and reads as a reject, and a burr at the recess edge stops the driver seating. |
| Why it happens | The panel is machined, the heads are visible, and the case is opened for calibration. |
| What we control | Pattern centring and recess condition checked on the same first article. |
Four reasons that matter on a visible patterned head, each tied to what the drawing has to prove:
|
Pattern and head height reviewed together
The pattern depth and the head height are reviewed before the second operation, so a head that would be thinned by the turning is raised first. Basis: Pattern depth and head height reviewed before machining. |
Headed, turned and passivated in one route
The head is formed, the CD pattern is turned concentric with the recess, and the part is passivated, all under one sequence of control. Basis: One route from wire to patterned head. |
|
Pattern, recess and thread checked on the part
The pattern is compared with the approved sample, the recess driven with the bit and the thread gauged, on the first article. Basis: First article checked against the approved sample. |
First article to repeat production
The first article fixes the drawing revision, heat number, die set, turning setting and thread roll; repeat orders are compared against that record. Basis: First article signed off before the batch is released. |
Shi Shi Tong forms these stainless steel pan head machine screws on a heading machine that upsets the pan head and the Phillips recess in one operation, then turns the CD pattern into the head face, rolls the machine thread and passivates the parts. The first part of every run is checked on the pattern, the recess and the thread, and compared with the approved sample, before the batch continues.
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The turning step is where this part differs from a plain pan head screw, so the setting is checked on the first part rather than adjusted during the run: the pattern has to be concentric, the depth has to leave the head at its drawing height, and the recess has to stay clean at its edge. Between runs the insert and the turning setting are changed together, because they define the same feature.
What decides whether a stainless steel pan head machine screw passes is the head diameter and height after turning, the CD pattern depth and centring, the recess condition, the thread class and the surface. The inspection agreement covers those, and the criteria come from the drawing and the approved sample.
Head and pattern on the projector |
Thread gauged per batch |
Hardness testing where the drawing requires it |
Salt-spray testing of the passivated part |
Each batch is recorded against the drawing revision: pattern, head height and recess from the first article, the thread gauged per batch, and the grade confirmed on the certificate. If the pattern or the recess check fails, the parts back to the last good setting are held and re-checked.
Where a third-party report is required for the material, it is written into the drawing, the report ships with the parts and the label carries the same batch number as the inspection record.
Every shipment of stainless steel pan head machine screws is traceable to the wire it was made from. The grade, heat number and standard 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 patterned head the first article is approved for appearance as well as dimension, under the light the customer will see it in, so the pattern is signed off before the batch runs. Buyers visit during the process to review samples and to see how the heads are turned.
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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 heading and turning cells 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 machine screw with a low domed head, a flat bearing face and a stainless body. This one adds a CD pattern turned into the head face and a Phillips recess, quoted from M1 to M14.
It is a fine circular turning finish on the top face of the head. Under light it reads as a bright concentric sheen, and it is used where the fastener is deliberately visible on an appliance, audio or instrument panel.
No. It is a cosmetic finish. What it does change is the tolerance: the turning removes material from the head, so the head height is measured after the pattern is cut.
Because a coating would fill the fine turning marks and the pattern would disappear. The part is supplied plain and passivated, which keeps the marks as cut and still gives stainless corrosion resistance.
Not locally. Polishing one area breaks the concentric rings, so a scuffed pattern head is a reject. That is why the parts are packed with the heads separated.
Head diameter and height after turning, CD pattern depth and pitch, pattern centring, recess size and depth, thread size and pitch, length and datum, material and grade, and finish.
How a stainless steel pan head machine screw project runs from drawing to repeat delivery:
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1
Send the drawing or sample
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→ |
2
Head, pattern and recess review
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→ |
3
First article 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 drawing revision from the first article is what repeat orders are checked against.
For a quotation, send the drawing with the head diameter and height, CD pattern depth and pitch, recess size and depth, thread size and pitch, length and its datum, material and grade, and finish.
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Head diameter and height
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CD pattern depth
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Recess size and depth
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Thread size and pitch
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Length and datum
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Material and 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
