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:CD pattern ultra low profile head screws with umbrella thread
Materials:Stainless steel
Surface treatment:Plain
Head Type:ultra thin head with CD pattern
Drive type:None (no slot; per drawing)
Thread feature:Barbed retention rings (reverse-barb / umbrella profile); per drawing
Thread:Barbed retention rings (umbrella profile), no thread
Forming:Multi-station cold heading with formed barbs
Number:1669
We manufacture stainless press-in fasteners with an ultra low CD-pattern head and umbrella barbed retention rings, so they press into a panel and hold without a thread or a driver, in M2 to M6 equivalents. Head and CD face, barb diameter and angle, and the hole fit are made to 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.
An ultra low profile head screw is a fastener whose head is thin enough to sit almost flush with the surface it closes, so nothing catches on it. This one is a press-in type: the head has no slot and the shank carries barbed retention rings instead of a machine thread, so it is pushed into a hole and held by the barbs rather than turned.
Head as a finished surface. The head is a thin flange with a CD pattern — a fine circular texture cut into the face — so it reads as part of the product rather than as a fastener. The flange spreads the load and stops the part sinking into a soft panel.
Barbs instead of thread. The retention rings are angled backwards, like an umbrella. They deflect as the part is pressed in and bite when it is pulled, so the fastener holds without a thread, a nut or a driver. The barb angle, diameter and spacing set the pull-out force.
No drive, no rework. With no slot and no thread, the part is installed once and not adjusted. That suits covers and trims that are fitted at assembly and rarely removed, and it demands that the hole and the barb profile are matched on the drawing.
Together these decide whether the part works: it sits flush, it grips the hole without turning, and the face looks like part of the product.
On an ultra low profile head screw the CD pattern on the face is a set of fine concentric rings, cut or formed after the head is made. It catches light in a controlled way, hides small handling marks and gives a visible part a finished look; the ring spacing and depth are part of the drawing, not a free choice at the machine.
The barbed rings on the shank are the retention feature. Each ring has a lead-in angle that lets it enter the hole and a sharper back angle that resists withdrawal, so the fastener presses in easily and holds hard. The ring diameter is slightly larger than the hole; too much interference and the panel splits, too little and the part pulls out.
The flange under the head sits against the panel face. Its diameter and the head thickness are checked together with the barb rings, because a thin flange that is too small will dish when the part is pressed home.
These press-in fasteners are quoted from M2 to M6 equivalents and in short lengths, with the head, barbs and hole fit measured on a projector and with a test panel. Where a longer version is required, custom lengths up to 2,000 mm are subject to DFM review after drawing submission.
| Item | How it is defined | What we control |
|---|---|---|
| Head diameter and thickness | The thin flange with the CD face | Checked on the projector on the first article |
| CD pattern | Ring spacing and depth on the face | Checked against the accepted sample |
| Barb diameter | Interference with the hole | Checked with a test panel and on the projector |
| Barb angle | Insertion versus pull-out | Checked on the profile; pull-out tested on the first article |
| Shank and length | Body below the flange | Measured from the flange face |
Each size is quoted against the panel it goes into. The hole diameter, the panel thickness and the barb profile are reviewed together, because a fastener that is right for one panel is wrong for another even at the same nominal size.
Head thickness and the barb start are measured from the flange face, and the barbs are checked for diameter and angle on the first article before the batch continues.
On an ultra low profile head screw the umbrella profile is what holds the part. Each ring has a gentle front face and a sharp back face: the front face lets the fastener enter, the back face digs into the hole wall when the part is pulled. Changing either angle changes both the insertion force and the pull-out force.
Hole fit is the other half of the joint. The hole has to be sized for the barb diameter and the panel material; a hard plastic needs less interference than a soft one, and a thin panel needs a shorter barb section so the ring does not sit past the far face.
| Parameter | Why it matters on a press-in part | What we control |
|---|---|---|
| Barb diameter | Interference with the hole | Checked with a test panel and on the projector |
| Barb angle | Insertion force against pull-out | Profile checked; pull-out tested on the first article |
| Barb length | It has to sit inside the panel thickness | Set from the panel on the drawing |
| Head thickness | A thin flange must not dish | Checked on the first article |
The part is supplied in plain stainless, passivated. The CD face is a decorative surface, so the finish has to leave the texture visible and even; a thick coating would round the rings and flatten the look, and a burr at the barb edge would change the insertion force.
| Finish | How it protects | Effect on CD face and barbs | Typical use |
|---|---|---|---|
| Passivated stainless | Free iron removed, passive film restored | No dimensional change | Stainless covers and trims |
| Electropolished | Surface levelled, chromium enriched | CD rings softened; sample compared | Visible parts with a bright face |
| Black oxide (carbon steel) | Conversion coating, minimal thickness | No measurable build-up | Indoor parts where black is required |
| Zinc plated (carbon steel) | Sacrificial zinc layer | Build-up on barbs; fit re-checked | Carbon steel equivalents |
| Dacromet flake (steel) | Zinc-aluminium flake layer | Thin film; barbs checked over coating | Outdoor carbon steel parts |
Salt-spray exposure is agreed per project and written on the drawing. On this part the finish is checked with a test panel as well as by eye, because a coating that changes the barb diameter by a few microns changes how the part presses in.
Packing protects the CD face. Parts are packed so the faces do not rub against each other, and the label carries the batch and the material heat.
Three assemblies where a press-in fastener with a thin decorative head replaces a screw, and what the part has to do instead:
| Where it sits | The part closes a thin cover or holds a trim plate where the face is visible and no driver access exists. |
| When it goes wrong | A head that stands proud catches on a case, and a barb that is too tight cracks the boss. |
| Why it happens | The panel is thin, the face is visible, and the part is installed once at assembly. |
| What we control | Head thickness and CD face checked, and the barb diameter matched to the hole on a test panel. |
| Where it sits | The part fastens a panel or a badge where the head has to sit flush with the sheet. |
| When it goes wrong | A loose part rattles out of a panel, and a heavy-handed press dents the sheet around the flange. |
| Why it happens | The sheet is thin, the part is pressed from one side, and the joint is not re-opened. |
| What we control | Flange diameter and barb profile checked, and the pull-out tested on the first article. |
| Where it sits | The part holds a trim clip or a small cover where the face is seen and the space behind is shallow. |
| When it goes wrong | A part that pulls out leaves a trim loose, and a barb that is too long bottoms in the panel. |
| Why it happens | The trim is thin, the temperature varies, and the part is pressed by hand or with a tool. |
| What we control | Barb length set to the panel, and the head checked for flush seating on the first article. |
Four reasons that matter on a press-in fastener with a CD face, each tied to what the drawing has to prove:
|
Hole and barbs reviewed first
The hole diameter, panel thickness and barb profile are reviewed together before tooling, so a part that would split the panel or pull out is raised first. Basis: Hole, panel and barb profile reviewed before tooling. |
Head, CD face and barbs in one route
The head, the CD face and the barb rings are produced in one forming route, so the rings stay concentric with the flange and the face. Basis: One route for head, face and barbs. |
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Barbs and face checked on the part
The barb diameter and angle are checked on the projector and the pull-out on a test panel, and the CD face compared with the sample. Basis: Barbs, pull-out and face checked on the first article. |
First article to repeat production
The first article fixes the drawing revision, material heat, die set and CD tool; repeat orders are compared against that record. Basis: First article signed off before the batch is released. |
Shi Shi Tong forms these parts on a multi-station header: the thin flange and the barbed rings are formed in the die, the CD pattern is applied to the face, and the parts are deburred and passivated. The first part of every run is checked on the projector and pressed into a test panel before the batch continues.
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Between runs the die insert is changed to the drawing head and barb dimensions; the first parts go to the gauges and to a test panel before the run continues, and the setting is recorded. Parts are packed face up so the CD pattern is not marked.
What decides whether an ultra low profile head screw passes is not how it looks in a tray: it is the head thickness and flange, the CD face against the sample, the barb diameter and angle, and the pull-out in a test panel. The inspection agreement covers those, and the criteria come from the drawing.
Dimensional gauging on the first article |
Head, CD face and barb profile on the projector |
Hardness testing where the drawing requires it |
Corrosion testing of the agreed finish |
Each batch is recorded against the drawing revision: head and barbs from the first article, the CD face compared with the sample, and the pull-out recorded from the test panel. If a gauge or the pull-out check fails, the parts back to the last good setting are held and re-checked.
Any outside test the drawing calls for is commissioned with the batch, and the report is filed under the same number as the inspection record.
Every shipment 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 or the finish. 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 and panel review, first-article approval, then batches checked against that sample. Press-in parts are approved together with a test panel of the customer’s material, so the barb fit and the panel are signed off as a pair. Buyers visit during the process to review samples and to see how the heads and barbs are formed.
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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 header and the finishing 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 a fastener with a thin decorative head and barbed retention rings instead of a thread. It is pressed into a hole and held by the barbs, so it needs no driver and sits almost flush.
Each ring has a lead-in face that lets the part enter and a sharper back face that bites into the hole wall when it is pulled. The diameter and angle set both the insertion force and the pull-out.
It is a set of fine concentric rings on the head face, cut or formed to catch light and give the part a finished look. Ring spacing and depth are specified on the drawing.
These fasteners are quoted in M2 to M6 equivalents and short lengths. Where a longer version is required, custom lengths up to 2,000 mm are subject to DFM review after drawing submission.
It is designed to be installed once. Removing it enlarges the hole, so the drawing or the panel design fixes whether the part can be replaced.
Head diameter and thickness, CD pattern, barb diameter and angle, barb length, shank length, material, finish and the hole diameter and panel thickness it presses into.
How a press-in fastener project runs from drawing to repeat delivery:
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1
Send the drawing or sample
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→ |
2
Hole and barb review
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→ |
3
First article and test 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 head diameter and thickness, CD pattern, barb diameter and angle, barb length, shank length, material, finish, and the hole diameter and panel thickness the part presses into.
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Head diameter and thickness
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CD pattern
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Barb diameter and angle
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Barb and shank length
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Material and finish
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Hole and panel thickness
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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
