Stainless Steel Button Head Socket Cap Screw

We make stainless steel button head socket cap screws with a low domed head and a hexagon socket, quoting them from M1 to M10 with lengths made to the drawing. The finish is agreed with the dimensions, and the first article is measured and compared in its finished state.

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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.

What Stainless Steel Button Head Socket Cap Screws Are

A stainless steel button head socket cap screw is a machine screw with a low domed head and an internal hexagon, made in stainless and left plain. The part recorded here is quoted from M1 to M10 with lengths made to the drawing.

Button head. A dome with a rounded rim and a flat annulus underneath, low enough to sit close to the panel.

Hexagon socket. An internal hexagon driven with a key, held in the height the low dome allows.

Stainless body. No coating, so the head can be finished after forming without stripping a layer first.

Machine thread. A uniform thread for a tapped hole or a nut, with the length measured over the head.

They are used on visible panels, instruments, enclosures and equipment where the fixing is meant to look finished rather than industrial, and where the head must stay low without disappearing into the surface.

The One Head That Gets Polished

Of all the socket head forms, the button head is the one that is regularly polished. A cap head can be turned and a counterbore hides it; a countersunk head is flush and largely out of sight; a button head sits on the surface, faces the viewer, and has a continuous spherical surface that takes a polish evenly across the whole head.

That has a consequence that shows up in the drawing. Polishing removes metal, and it removes it from the highest points first: the dome, the rim and the edges of the socket. A part that measured correctly before polishing can be a little lower in head height, a little smaller in diameter, and a little softer at the socket edges afterwards, and none of those changes is a defect in the finishing sense.

So on a button head socket cap screw the dimensions have to be understood as post-finish values. Where a button head is specified as polished or vibratory finished, the head height and socket depth are measured after the finish, because that is the state the customer receives and the state the key meets. A supplier that measures before finishing and ships after it has measured a different part.

On a button head socket cap screw the socket is the feature most affected. Polishing rounds the edge of each flat, and a rounded edge means the key engages over a slightly shorter wall. On a low dome where the socket is already shallow, that reduction is worth knowing about, and it is why the drive is proved with the production key after finishing rather than before.

What stainless adds is that the finish can be the whole appearance. There is no plating to chip or to dull, and no colour to match: a polished stainless head either matches the panel or it does not, and the judgement is made on the surface, not on a colour sample.

Sizes, Head and Socket

The recorded range is M1 to M10, with lengths made to the drawing. Custom lengths up to 2,000 mm are subject to the drawing submission and DFM review. The quotation for a stainless steel button head socket cap screw carries the head diameter and height, the socket size and depth, the surface finish, the thread pitch and the overall length.

The finish line belongs in the table because it changes the other four. A drawing that lists dimensions and then notes a polish in a corner has stated two specifications that interact and left the relationship to the supplier.

Socket depth is measured from the floor to the top of the dome, after finishing. On a button head the top of the dome is the highest point of the part, so that datum is easy to agree and easy to reproduce on a projector.

Length is measured over the head as well, and on a polished part the number is the post-finish value. A tenth of a millimetre matters on a low head sitting in a counterbore-free pocket.

What a Stainless Button Head Gives and Costs

Four properties decide stainless steel button head socket cap screws, and each one carries a cost:

The value of a button head socket cap screw is a fixing that reads as hardware rather than as a fastener. On a visible panel that is the whole point: the head is part of the design, and the material can be finished to match the rest of the product.

The cost is that the appearance and the dimensions are coupled. Anything done to improve the surface removes material, and the removal has to be accounted for in the numbers the customer is measuring against.

Finishing Options and Their Effect

The recorded finish is plain, and the options below are the ones that actually appear on button head drawings. Each has a different effect on the head, and the effect is the reason the finish belongs in the specification rather than in a note.

Surface Options for Stainless Steel Button Head Screws

The two polishing options differ in how much they remove, not in whether they remove. Vibratory finishing takes a little from every surface at once and is even across a batch; hand polishing takes more from the dome and the rim and is only as even as the operator. Both are legitimate, and both change what the key meets.

Where the finish is important to the customer’s appearance, the practical answer is to agree a retained sample per finish and to measure the first article after it. That pairs a surface judgement with a dimensional one, which is the only way to keep the two from drifting apart over a repeat order.

Where Stainless Button Head Screws Are Used

Three settings where a visible, low, finishable head is the requirement:

Why Shi Shi Tong for Stainless Steel Button Head Socket Cap Screws

Four reasons that matter on a head whose finish and dimensions interact, each tied to something the drawing or the first article has to prove:

How Stainless Steel Button Head Socket Cap Screws Are Made

These screws are headed on single-die machines that form the dome in one stroke, broached with a hexagonal punch, thread rolled on the stainless shank, and then passivated or polished. The first part of every run is measured on head diameter and height, socket size and depth, thread and length, and the measurement is repeated after finishing where a finish is specified.

Forming the dome sets the geometry that finishing later acts on. The punch leaves a rim radius and a flat annulus under the dome, and a rim that is a little too tight will open visibly in the polish, while a rim that is too generous looks flat before it and worse after. The rim is checked on the first article as a form, not only as a size.

Broaching the hexagon follows, and on a low dome it is the operation with the least margin. The walls come out thin if the punch is deep, thick if it is shallow, and both pass a socket size check. After polishing, the edge of each flat is rounded, so the effective engagement is shorter than the measured depth suggests.

Finishing is the last step and the one that decides the appearance of the batch. Vibratory finishing gives an even tone across the run; hand polishing gives a brighter appearance and less consistency. Either way the batch is compared with the retained sample before packing, and the first article is measured again in its finished state.

Inspection: Head, Socket and Finish

What decides whether stainless steel button head socket cap screws pass is the head form, the socket, the thread and the finish, measured in the order they are made and checked in the state they ship.

Head and socket after finishing	Thread and start checked
Hardness against the stainless spec	Salt-spray testing of the finished head

Head diameter, height and socket depth are measured on the projector after the finish, with the datum at the top of the dome. On a polished part those measurements are the specification, and comparing them with pre-finish values is how a batch gets rejected for a finish that was within its own tolerance.

The socket is proved with the production key at the torque the joint calls for, and the edges of the flats are inspected under magnification. Polishing softens those edges, and a socket that seats before the finish can still mark after it.

A sample from every batch is fitted into the customer panel and compared with the retained finish sample under the same light. That is the check that pairs appearance with the dimensional record, and it is recorded with the batch.

Certificates and Material Documentation

Every batch is traceable to the heat of stainless it was made from. The grade and heat number appear on the material certificate supplied with the parts, and the inspection records carry the measured values in the finished state.

ISO 9001:2015	RoHS test report
Registered trademark	Patent: security screw and driver

With each shipment we supply the material certificate, the inspection record for the dimensions in the finished state including the socket depth, and the surface record with the retained sample reference. The documents carry the drawing revision and the batch number, so a repeat order of stainless steel button head socket cap screws matches in appearance and in measurement.

Customers and Projects

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 polished button head the first article is compared with the customer sample under a known light and measured in the finished state. Buyers visit during the process to review samples.

Buyers and quality engineers visit for sample review, process discussion and supplier audits; the visit is arranged around production so the headers, the broaching station and the finishing area 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

Related Products and Guides

Technical Guides

Hex Socket Screw Specification Table

Socket size and head height against diameter, across the socket family.

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Socket Screws: Types, Uses and Customization

How a socket head is specified, and what the key decides.

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Products

Hex Socket Button Head Screw The same head with a captive washer. Hex Socket Button Head Screw	SS Socket Head Cap Screws Stainless with a tall head and a long shank. SS Socket Head Cap Screws	Low Profile Socket Head Screws A cap head with less height in 304. Low Profile Socket Head Screws
Socket Head Cap Screw The standard tall cap head. Socket Head Cap Screw	Cross Recessed Pan Head Screws A cross recess in stainless for the same panels. Cross Recessed Pan Head Screws	Pan Head Socket Screw A socket drive in a rounded pan head. Pan Head Socket Screw

Stainless Steel Button Head Socket Cap Screw FAQ

Order Stainless Steel Button Head Socket Cap Screws

How a button head socket screw project runs from drawing to repeat delivery:

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.