Brass Shoulder Screw Copper CNC Cap Head

We turn brass shoulder screws with a plain cap face, a toleranced shoulder and a machine thread, quoting them from M1 to M14. Alloy, head face finish, shoulder tolerance and thread come from your drawing, and the first article is both the fit and the appearance reference.

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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 a Brass Shoulder Screw Is

A brass shoulder screw is a turned fastener in brass with a plain cap head, a toleranced shoulder and a machine thread, quoted here from M1 to M14 with Number 634. There is no drive recess in the head: the cap face is plain, and the part is meant to be set by hand or with a collet while the shoulder does the locating.

Brass body. A copper-zinc alloy, free-cutting, non-magnetic and conductive, used where appearance and machinability matter as much as strength.

Plain cap head. A flat-faced cylindrical head with no recess, so the top is a clean surface rather than a drive.

Shoulder. A turned plain section that runs in a bore and carries the radial load.

Plain finish. No coating; the brass is the surface and it is left as turned.

A brass shoulder screw of this form sits where a machined-looking fixing and a locating journal are wanted together: an instrument face, a fitting, a display panel, or a joint where the screw is part of an electrical path and must not be magnetic.

A Head Without a Drive

A brass shoulder screw with a plain cap head is a part where the head is not the drive. There is no slot, cross or socket to take a bit, so the screw is fitted by turning it by hand on the head, by gripping it in a soft collet, or by using the thread itself with a nut on the far side. That changes what the part is for: it is a locating or decorative fastener, not a high-torque joint.

The plain face is the reason the part exists in visible work. A cap head that has been turned and polished in brass reads as a machined detail; a recess in the same head would read as a fastener. Where the screw is on show — instruments, fittings, display hardware — a plain cap face is often the specification rather than a compromise.

The material does the rest. Brass machines freely, so the shoulder can be turned true and finished smooth without the tool marks that a tougher alloy leaves; it is non-magnetic, which matters beside instruments; and it conducts, which matters where the screw is part of an electrical path.

Brass also changes with time. Left plain it darkens to a warmer tone and eventually shows a brown patina, which in decorative work is often wanted and in instrument work is often not. Where the colour has to stay, a lacquer is specified; where the part is functional and hidden, plain brass is left to age.

The shoulder is the functional half of the part. It is turned in the same setup as the head and the thread register, so the shoulder runs true; on a brass part that is easy to achieve and easy to spoil, because the material cuts so freely that a dull tool leaves a smeared surface instead of a clean one.

Sizes, Head and Shoulder

The recorded range is M1 to M14, with the small sizes used on instruments and the medium ones on fittings and hardware. Custom lengths up to 2,000 mm are subject to DFM review after drawing submission. For a brass shoulder screw the quotation carries the head diameter and height, shoulder diameter and tolerance, shoulder length, thread and the alloy.

The alloy matters on a brass shoulder screw more than on steel parts. Free-cutting brass machines cleanly and holds a sharp edge; a harder or gummier brass leaves a torn shoulder and a dull face, and no amount of polishing after the fact restores the geometry.

Where the part is used near salt water, the alloy choice has to be made deliberately. Some brasses dezincify in chlorides and lose their strength from the inside; the stainless or bronze alternative is the safer specification, even though it costs the brass colour.

Clean Face, True Shoulder, Warm Metal

Three features define the part: the plain cap face, the turned shoulder and the brass body. The first is why it is chosen, the second is what it locates, and the third decides both the look and how easily the first two are made.

The clean face is the whole point of the part in visible work, and it is also its limitation: with no drive, the joint cannot be tightened hard, so the design has to place the load on the shoulder and the fit rather than on the preload.

The brass makes the making easy and the using delicate. It cuts and turns beautifully, and it marks if a tool slips; the head that is supposed to look machined is the first thing to show a scratch.

Plain Brass and Its Options

The recorded finish is plain, with no coating. On a brass shoulder screw that keeps the material as the surface: the colour is the alloy, the face is as turned, and there is no deposit to round the edge of the cap or to change the shoulder diameter.

Finish Options for Brass Shoulder Screws

Lacquer is the usual answer where the part is visible and the customer wants the colour to hold. It slows the change for a year or two and wears at the edges rather than flaking across the face, which on a plain cap head is acceptable; on a recessed head it would not be.

Plating is the wrong answer for the shoulder unless the drawing allows for it. A nickel or chrome deposit on a toleranced shoulder changes the fit, and the part that was a pivot becomes a press fit.

Where These Screws Are Used

Three assemblies where a brass shoulder screw is the fixing:

Why Shi Shi Tong for Brass Shoulder Screws

Four reasons that matter on a plain-faced brass part, each tied to what the drawing has to prove:

How These Parts Are Manufactured

Shi Shi Tong turns brass shoulder screws from brass bar in one setup that cuts the cap face, the head, the shoulder and the thread register, then rolls or cuts the machine thread and finishes the face. The first part of every run is measured on head diameter, face flatness, shoulder diameter and length before the batch continues.

The cap face is where a brass part is won or lost. A sharp tool leaves a clean, bright face; a dull one smears the metal and leaves a grey band across the top, and because there is no recess to draw the eye, the smeared face is the whole visible product.

Inspection: Face, Shoulder and Thread

What decides whether brass shoulder screws pass is the face, the head, the shoulder and the thread. The inspection agreement covers those, and the criteria come from the drawing.

Face and shoulder on the projector	Thread gauged per batch
Hardness checked on the bar	Salt-spray testing of the finish

The face is checked for flatness and for tool marks under low magnification, the head for diameter and height, and the shoulder for diameter and roundness. The thread is gauged per batch, and the colour is compared with the approved sample under the same light.

The first article is also fitted by hand into the bore it serves, since a brass part with no drive is set by hand and a tight shoulder is felt immediately.

Certificates and Material Documentation

Every shipment of brass shoulder screws is traceable to the bar it was made from. The alloy and temper 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 alloy. The documents carry the drawing revision and the batch number, so a repeat order is made from the same alloy and the same face finish that were approved.

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 brass shoulder screw the first article is the appearance standard as well as the fit, because the plain face is the product. Buyers visit during the process to review samples and to see how the parts are turned.

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

Long Thin Screws: Drawing and Manufacturing Requirements What to put on the drawing for long, thin parts: datum, shank, thread position and handling. Read the guide

How Long Does It Take to Customize Extra-Long Screws? Where the time goes in a custom long-screw order, from drawing review to first article. Read the guide

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Brass Shoulder Screw FAQ

Order Brass Shoulder Screws

How a brass shoulder screw project runs from drawing to repeat delivery:

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.