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:Flanged Button Head Cap Screws
Materials:Steel
Surface treatment:Nickel Plated
Head Type:Button Washer Head
Drive:Allen Socket
Thread:Machine Thread
Point:Blunt
Forming:Single Die Heading
Size:M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M14
Number:785
We make flanged button head cap screws in nickel plated steel, a low domed head with an integral flange that replaces the washer, a hexagon socket and a machine thread, quoted from M1 to M14. Flange diameter, head height, socket and thread come from your drawing, and the first article is fitted into 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.
Flanged button head cap screws are socket screws with a low domed head and a wide integral flange underneath it, so the bearing face replaces a separate washer. The flange spreads the clamp load, the button dome keeps the edges rounded, and the internal hexagon takes the drive. This family is made in steel with a nickel plate, quoted from M1 to M14 with Number 785 and filed against the ISO head form.
Button head. A low, fully domed head. It has no sharp edge, so nothing catches on it and nothing is cut by it.
Integral flange. A flat collar turned out at the base of the head. It is the washer, made as part of the screw.
Hexagon socket. An internal hexagon for a hex key, sized to the thread.
Machine thread. A rolled thread for a tapped hole or a nut, ending in a blunt chamfer.
In practice the flange is what makes the part a family: the dome shows the head, but the collar decides the bearing area the joint gets and whether the fixing can be closed on a thin panel without a washer.
A flanged button head cap screw exists to solve two small problems at once. The first is the loose washer: on a production line a separate washer is one more part to stock, feed and drop, and a flange that is part of the screw removes it. The second is the bearing area: a plain button head is small for its thread, and the flange gives a wide face without a separate component.
The load path is straightforward until the flange meets a surface it cannot sit on. A flange is a flat annulus with a radius where it turns into the head, and if the hole is punched with a burr, or sits on a cast boss that is not square, the flange makes contact on one side and the screw tilts as it is tightened. A plain head with a washer tolerates that better, because the washer can conform; the flange cannot.
The second consequence is that the flange hides the joint. Once the head is down, the contact ring under the flange is invisible, so a joint that has lost preload looks exactly like one that has not. On a plain head there is a visible gap between the head and the panel that a fitter can read; on a flanged head there is a shadow. That is the trade for the neat appearance: the assembly is cleaner and less informative.
The flange also traps moisture. Water sits in the annular recess between the flange edge and the panel, and it stays there, because the joint is closed and the recess has no drainage. Under the flange the coating is the only protection, which is why the finish matters more on a flanged head than on a plain one, and why a stainless version is often chosen for outdoor work.
The button head is the other half of the form. It is low, which keeps the fixing out of the way, and it is domed, which removes the edge that would otherwise cut a hand or catch a cable. The cost is socket depth: a low head has less material for the hexagon, so the socket is shallower than on a cap head of the same thread, and the torque the joint can take is limited by the drive rather than by the thread.
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 a flanged button head cap screw the quotation carries head diameter, flange diameter, head height and socket size, because the flange is the feature that replaced the washer.
| Item | How it is defined | What we control |
|---|---|---|
| Head | Domed button head | Head diameter and height |
| Flange | Integral flat collar | Flange diameter, thickness, face flatness |
| Socket | Internal hexagon | Socket across flats 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 is measured from under the flange, because the flange is the bearing face. That detail matters when a customer switches from a plain button head with a washer to a flanged one: the washer added its thickness to the stack, the flange adds almost none, and the same length may now be a fraction long or short in a blind hole.
Flange diameter is the number that decides whether the joint works on soft material. A wide flange on a thin plastic or aluminium panel spreads the load over more area and stops the panel dimpling; a narrow one looks neater and puts the same load back on a smaller ring.
Three features define this part: the flange, the low button dome and the hexagon socket. The first spreads the load and removes a component, the second keeps the fixing out of the way, and the third is the drive that the low head has to accommodate.
| Feature | What it gives | What it costs |
|---|---|---|
| Integral flange | Washer without a second part | Needs a flat, square seat |
| Wide bearing face | Load spread on soft panels | Traps water under the flange |
| Low button dome | Nothing to catch, no sharp edge | Less material for the socket |
| Hexagon socket | Common tool, good torque | Shallow socket in a low head |
| Nickel plate | Bright, thin, decorative | Barrier only; rusts at a scratch |
The flange is the reason to choose the part, so it should be the reason to check the drawing. A flange specified only by head diameter, with no flange diameter or thickness, lets the maker decide how much bearing area the joint gets — and on a soft panel that is a decision that should not be left open.
The shallow socket is the practical limit on assembly. A low head cannot carry a deep hexagon, so the key engages less, and an operator who needs more torque will feel the socket give before the joint is tight. Where the joint needs real preload, a cap head of the same thread does the job with a deeper socket and a taller head.
The recorded finish is nickel on steel. On a flanged head the coating is doing work in a place nobody sees: the annular recess under the flange holds water against the panel, so the plate on the underside of the flange is the only barrier there. Nickel is a barrier coating, so a thin or missing patch under the flange becomes the first rust point on the part.
| Option | How it protects | Effect on head and socket | Typical use |
|---|---|---|---|
| Nickel plated | Barrier deposit, bright | Thin; socket as plated | Visible indoor assemblies |
| White zinc | Sacrificial zinc | A few microns; fit re-checked | Indoor panels and brackets |
| Black zinc | Sacrificial zinc, dark | A few microns; fit re-checked | Dark equipment and trim |
| Black oxide | Conversion film, oiled | No measurable build | Internal machine parts |
| Stainless, plain | Passive chromium oxide film | None; socket as cut | Outdoor and damp joints |
Where the joint is exposed, the stainless version of the same head is the answer, and the flange behaves identically. The choice is made on the panel and the weather rather than on the head form, but it is worth making at the drawing stage, because changing the material later also changes the torque the socket will take.
Three assemblies where flanged button head cap screws are the fixing:
| Where it sits | The screw fixes a panel or a bracket where a washer would be a nuisance in the station and the bearing face has to spread load on thin material. |
| When it goes wrong | A burr or a panel that is not square tilts the flange, and the joint loses preload without looking loose. |
| Why it happens | The panel is thin, the fixing is repeated, and the seat is not always flat. |
| What we control | Flange diameter and face flatness checked, first article fitted to the panel. |
| Where it sits | The screw fixes a guard or a cover where every projecting edge is a snag point and the head has to be smooth to the touch. |
| When it goes wrong | A cap head edge catches a sleeve or a cable, and a rounded head with a flange is the alternative that still takes a key. |
| Why it happens | The surface is touched and passed by hand, and the head is exposed. |
| What we control | Dome form checked, socket driven with the production key. |
| Where it sits | The screw fixes a lid or a module where the material creeps under load and the bearing area has to be generous. |
| When it goes wrong | A small head dimples the plastic and the joint relaxes, and a flange that digs into the material cuts it. |
| Why it happens | The material is soft, the load is a bearing load, and the joint is visible. |
| What we control | Flange diameter and face condition checked, first article trialled in the housing. |
Four reasons that matter on a flanged socket screw, each tied to what the drawing has to prove:
|
Flange diameter and seat reviewed
The flange diameter, the panel and the seat are reviewed together, because a flange that is too narrow dimples the panel and one that cannot sit flat tilts the screw. Basis: Flange diameter and seat agreed in writing. |
Head, flange, socket and thread in one route
The button head, the flange and the hexagon are formed in the heading stroke, the thread is rolled and the parts are nickel plated in the same route. Basis: One route from wire to plated screw. |
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Face checked flat, socket driven
The flange face is checked for flatness and the socket driven with the production key, because a socket that measures to the drawing can still refuse a worn key. Basis: First article driven with the production key. |
First article fixes the setting
The first article fixes the wire heat, the socket punch and the plating; repeat orders are compared against that record. Basis: First article signed off before the batch is released. |
Shi Shi Tong forms these flanged button head cap screws from steel wire on single-die headers that form the button head, the flange and the hexagon in one stroke, rolls the machine thread to a blunt chamfered end and sends the parts to nickel plating. The first part of every run is measured on the head and flange, driven with the production key and entered into a thread gauge before the batch continues.
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The flange is formed in the same stroke as the head, and it is where the die shows its age first. A worn punch leaves a flange that is slightly conical rather than flat, and a conical flange bears on its outer edge — the joint looks tight, rocks under load, and cannot be diagnosed from the top because the contact ring is hidden.
What decides whether flanged button head cap screws pass is the flange, the head, the socket and the thread. The inspection agreement covers those, and the criteria come from the drawing.
Flange and head on the projector |
Thread gauged per batch |
Hardness checked on the wire |
Salt-spray testing of the plate |
The flange face is checked for flatness and for diameter on the projector, and the transition radius between the flange and the dome is checked visually at magnification, because a sharp transition is where a flanged head cracks. The socket is checked across flats and for depth and then driven with the production key.
The thread is gauged per batch, the head height is measured, and the plating is checked for thickness and adhesion with a focus on the underside of the flange. A part that passes every dimensional check and has a thin patch under the flange will still be the first one to rust in service.
Every shipment of flanged button 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 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 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 flanged screw the first article is fitted into the customer’s panel, because the seat is the function. Buyers visit during the process to review samples and to see how the heads and flanges 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 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 |
It replaces a washer. The integral collar gives a wide bearing face without a second part to stock or drop, and it spreads load on thin or soft panels.
Less well than a separate washer. A flange is flat and rigid, so a burr or an out-of-square boss tilts the screw instead of being absorbed.
The head is low. There is less material for the hexagon, so the key engages less and the torque the drive can take is lower than on a cap head of the same thread.
From under the flange, because the flange is the bearing face. Moving from a plain head plus washer to a flanged head changes the stack height.
Only in stainless, or with a coating that survives the recess. Water collects under the flange and stays there, so the underside of the flange is the first rust point.
Thread size and length, head diameter and height, flange diameter and thickness, socket size and depth, the grade and the finish.
How a flanged button head cap screw project runs from drawing to repeat delivery:
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1
Send the drawing and the panel it seats on
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→ |
2
Flange diameter, socket and thread agreed
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→ |
3
First article fitted into 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 flange diameter and thickness, the socket size and the finish.
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Thread size
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Length
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Head diameter
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Flange diameter
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Socket 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
