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+86 13143444311
Email：sst@szsst88.com
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Address：Building 9, First Industrial Zone, Tantou Industrial City, Songgang Street, Baoan District, Shenzhen 518105, Guangdong, China
Type:Small Brass Screws Round Head
Materials:Brass
Surface treatment:Plain
Head Type:Round head
Drive:Cross recess (Phillips)
Thread:Machine thread
Point:Plain, chamfered
Forming:Single Die Heading
Size:M1 M2 M3 M4 M5 M6 M7 M8 M9 M10
We make small brass screws with a round head and a cross recess, plain finish, quoting them from M1 to M10 with lengths made to the drawing. The recess depth is agreed with your driver, and the first article is compared with your sample on tone and on drive.
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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.
Small brass screws with a round head are machine screws cut in brass with a domed head and a cross recess, used in miniature and decorative assemblies. The part recorded here is plain brass, quoted from M1 to M10 with the small sizes in the same range and lengths made to the drawing.
Round head. A domed head that stands on the surface, wide enough to spread the clamp and low enough to look like a detail.
Cross recess. Four tapered arms driven by a matching bit, cut into a head that is only a few tenths deep at the smallest sizes.
Brass body. Free-cutting, non-magnetic, conductive, and soft enough that the recess is the first thing that deforms.
Plain finish. The alloy is the surface, so the tone of the batch is part of the specification.
They are used on instruments, lamps and light fittings, small electrical terminals, decorative boxes and shopfitting details, and in any small assembly where brass is the intended look rather than a compromise.
The cross recess is designed around four thin arms. In steel those arms hold their shape through many assemblies; in brass they do not, because brass is soft and the arms are the thinnest feature on the part. The first driver is usually fine; the second or third, with a slightly worn bit, is where the arms take a permanent set.
That changes what the drawing has to specify. On a steel part the recess is made to the standard and the torque is set by the thread. On a brass part the recess depth and arm width are chosen so the bit can bear on as much wall as the head allows, and the torque is set low enough that the recess is not the thing being tested. A drawing that copies a steel recess onto brass has copied the shape and lost the margin.
The round head helps and hurts at the same time. It gives the recess more material to work with than a countersunk head, because the dome sits on top of the bearing face rather than cutting into it; but a round head also stands proud, so anything that passes over the fixing will touch it, and a marked recess is then visible from the side as well as from above.
The size adds the last constraint. At M2 and below the whole head is a small dome with a shallow recess, and the difference between a part that drives twice and a part that drives once is a few hundredths of a millimetre of arm wall. That is why small brass screws are checked with the customer’s driver rather than against a nominal size.
Brass has one advantage that steel cannot match at this scale: it can be polished, aged or lacquered later without stripping a coating first. Where the assembly is visible, that flexibility is worth more than the strength the part gives up.
The recorded range is M1 to M10, with the small sizes quoted in the same envelope and lengths made to the drawing. Custom lengths up to 2,000 mm are subject to the drawing submission and DFM review. The quotation for small brass screws round head carries the head diameter and height, the recess size and depth, the thread pitch and the overall length.
| Item | How it is defined | What we control |
|---|---|---|
| Head | Round head, on the surface | Diameter, height and dome radius |
| Recess | Cross, PH size per diameter | Arm depth, arm width and floor |
| Thread | Machine thread in brass | Pitch, length and start position |
| Length | Overall, head included | Length tolerance and thread start |
| Finish | Plain brass | Tone and surface condition |
| Batch | Colour and recess condition | Retained sample per batch |
Recess depth is the dimension that matters most and it is the one that is hardest to see. It is bounded by the head height, and on a round head of M2 size that height is small; a recess that is nominally correct and cut a little shallow will take a bit only part way, and the bit then bears on the top of the arms.
Head diameter is chosen against the surface. A round head on a small panel spreads the clamp and covers a slightly oversize hole; on a narrow frame it is the part that decides how much material is left around the hole.
Tone is a dimension for plain brass. Two batches that are correct in every measurement can look different side by side, and on a visible assembly the customer will notice the colour before the tolerance.
Four properties decide small brass screws round head, and each one carries a cost:
| Property | What it gives | What it costs |
|---|---|---|
| Brass body | Non-magnetic, conductive, decorative | Soft; recess deforms early |
| Round head | Wide bearing face, more recess height | Stands proud of the surface |
| Cross recess | Four drive positions, self-centring | Thin arms in a soft metal |
| Plain finish | Can be polished, aged or lacquered | Tone varies between batches |
The value is a fixing that belongs to the product. It matches the metal of a lamp or an instrument, it does not attract a magnet, and it can be finished after assembly to match the rest of the piece.
The cost is that it is not a structural fastener. The recess is the limit on torque, the thread is the limit on load, and both are lower than a steel part of the same size would give.
The recorded finish is plain, so the alloy is the surface. That is a deliberate choice on a decorative part: the screws can be polished with the rest of the assembly, aged to match an antique finish, or lacquered after the joint is closed.
| Option | What it does | Effect on head and recess | Typical use |
|---|---|---|---|
| Plain, as supplied | The alloy itself | Recess as cut; no build | Instruments and fittings |
| Polished | Mechanical smoothing | Recess edges rounded slightly | Visible bright heads |
| Aged or darkened | Chemical colouring | Colour even inside the recess | Restoration and period work |
| Lacquered | Clear film | Film can bridge the recess | Furniture and shopfitting |
| Nickel or black plated | Barrier or colour layer | Build in recess; re-gauged | Where a different look is wanted |
A lacquer is the finish that needs most care on a small head, because a heavy film bridges the recess and the driver then cuts through it. On a part this size that shows as a ragged ring around the cross, which reads as damage rather than as a finish.
Where a plated finish is used, the recess is gauged after plating. A film inside a small cross changes which bit seats, and on brass the arms have no margin to absorb that change.
Three settings where brass and a small round head belong together:
| Where it sits | The screw holds a shade ring, a terminal cover or a decorative plate where brass is the intended finish. |
| When it goes wrong | A plated steel screw is substituted and the tone reads as steel rather than brass. |
| Why it happens | The fitting is visible, the joint is small, and the head is part of the design. |
| What we control | Tone matched to the sample; recess proved with the fitting’s driver. |
| Where it sits | The screw closes a small assembly where the fixing must not attract a magnet and must conduct if it touches a terminal. |
| When it goes wrong | The thread strips in a brass insert, or the recess rounds at the first assembly. |
| Why it happens | The assembly is small, the joint is serviced, and the material is brass throughout. |
| What we control | Recess depth and thread checked; first article assembled at the specified torque. |
| Where it sits | The screw closes a hinge or a plate where the head is seen at close range and the finish has to match. |
| When it goes wrong | Two batches of screws differ in tone and the difference shows across a face. |
| Why it happens | The piece is visible, the fixings are numerous, and the assembly is inspected. |
| What we control | Retained colour sample per batch; first article fitted on the finished piece. |
Four reasons that matter on a soft small head, each tied to something the first article has to prove:
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Recess depth agreed with the driver
The recess size and depth are agreed against the driver the customer uses, because in brass a recess that is a fraction shallow will be marked on the second assembly. Basis: Recess matched to your driver. |
Headed, recessed, threaded, left plain
The round head and cross are formed and cut in one sequence, the thread rolled on the brass, and the parts left plain so they can be finished after assembly. Basis: One route, no coating to strip. |
|
Depth and arm width measured
Recess depth and arm width are measured on the projector and the recess proved with the production bit, because on brass the arms are where the margin is smallest. Basis: Depth and arms measured. |
Same tone across batches
A retained sample per batch carries the colour, so a repeat order of small brass screws round head matches the assembly rather than only the drawing. Basis: Colour held across orders. |
These screws are headed on single-die machines that form the round head in one stroke, cut with the cross recess, thread rolled on the brass and left plain. The first part of every run is measured on head diameter and height, recess size, depth and arm width, thread and length.
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Cutting a cross recess into brass is easier than into steel and less forgiving of a worn tool. Brass shears cleanly, so the arms come out sharp, but a punch that has dulled a little displaces metal instead of cutting it and leaves the arms slightly rounded and the floor slightly high. That combination looks correct and takes the bit only part of the way in.
Thread rolling follows, at a lower force than on steel. Over-rolling work-hardens the crest and makes it brittle, which shows as a chipped thread after the first assembly rather than as a dimensional error.
Because the parts are left plain, handling is part of the process. Brass tarnishes where it is touched, so the screws are kept dry, handled with gloves at final inspection, and packed so that they do not rub the recess edges bright against each other.
What decides whether small brass screws round head pass is the recess, the head, the thread and the tone. The inspection agreement covers those, and the criteria come from the drawing.
Recess depth and arms on the projector |
Thread and start checked |
Hardness against the brass spec |
Humidity exposure on the plain surface |
Recess depth, arm width and head height are measured together on the projector, because on a small round head the three are one geometry. The thread is gauged after rolling and the length is measured over the head.
The functional check is a drive with the customer’s driver at the agreed torque, removed and driven again, with the recess inspected under magnification after each cycle. That twice-driven check is what separates a brass part that will survive an adjustment from one that will not.
Tone is checked against the retained sample under the same light. It is not a measurement, and it is the check the customer will make first.
Every batch is traceable to the brass rod it was made from. The alloy and heat number appear 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 shipment we supply the material certificate, the inspection record for the dimensions on the drawing including recess depth, and the RoHS report for the alloy. The documents carry the drawing revision and the batch number, so a repeat order of small brass screws round head matches the original assembly.
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 plain brass the first article is compared with the customer sample side by side, because tone is judged before tolerance. Buyers visit during the process to review samples.
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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 headers and the recess 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 |
Brass is soft and the cross arms are the thinnest feature. A worn bit bears on the top of the arms and they take a permanent set.
Not through ageing in ordinary use. It strips sooner than steel at the same size from the start, which is why the torque is set low.
They are close. A round head is more domed and usually smaller in diameter; pan head is the wider, flatter profile. Both sit on the surface.
Indoors it darkens slowly rather than corroding. Outdoors in salt air it tarnishes quickly, and a different alloy or finish is the better answer.
Yes, and that is often the point of a plain finish. A heavy coat can bridge the recess, so the lacquer is applied before the final drive.
Head diameter and height, recess size and depth, thread pitch and overall length, plus the driver used.
How a small brass screw project runs from drawing to repeat delivery:
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1
Send the drawing and the driver
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2
Recess depth and head size agreed
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→ |
3
First article compared with your sample
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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, recess size and depth, thread pitch and overall length.
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Head diameter
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Head height
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Recess size
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Recess depth
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Thread pitch
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Length
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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
