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:Male Female Screw Fasteners
Materials:Carbon Steel
Surface treatment:Eco Friendly Black Zinc Plated
Head Type:Truss head, matched pair
Drive:Slotted male head
Thread:Internal thread in the barrel, external on the stud
Point:Plain, chamfered
Forming:Headed; barrel drilled and tapped; pair plated together
Size:M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M12
We make male female screw fasteners as a matched pair of truss-head stud and barrel, in carbon steel with an eco black zinc finish. At micro sizes the coating is a working dimension rather than a colour, so both threads are gauged after plating and both halves are plated in the same lot.
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.
Male female screw fasteners are two-piece posts: a male stud with a head and a female barrel with a matching internal thread, drawn together through the work. This part is carbon steel with truss heads, a slotted male head and an eco black zinc finish, quoted from M1 upward with the lengths made to the drawing.
Two pieces. A male and a female, so the joint can be closed from both faces of the work.
Truss heads. Wide, shallow domes that sit close to the surface and spread the load.
Slotted male head. A single slot, so the male can be held or turned while the female is set.
Black zinc. A thin, uniform dark finish, applied to both halves of the pair.
They are used in micro and small assemblies: albums, folders, tags, display boards, leather goods and enclosures, where the two faces are seen and the pair has to look like one fitting.
On an M6 screw a few microns of zinc is decoration. On an M1 thread it is a working dimension: the pitch is a quarter of a millimetre and the thread depth is smaller than that, so a coating of three or four microns takes up a noticeable share of the clearance between the male and female threads. A film that is at the top of the tolerance can make the pair stiff or tight; a film that is uneven along the thread makes it stiff in one place and free in another.
The solution is not a thinner coating alone; it is a thread cut to suit the finished part. The male and the female threads are gauged after plating, and the blank is allowed for the film, so the delivered pair runs onto its full engagement by hand. On this size the allowance is set per material and per coating rather than taken from a table.
The two halves are also plated together for a reason. Male and female from different lots can differ by a micron or two in film thickness, and at micro sizes that is enough to make a pair that was free in the sample stiff in the batch. Matching the halves by lot is a process rule, not a preference.
Alignment is the second micro-size issue. The two truss heads have to sit concentric with one another, or the pair reads as a rivet fitted crooked. That alignment comes from the female barrel being straight and square, and from the male thread running true, rather than from anything the assembler can adjust.
Engagement is short by design on a micro post. There are only a few threads in the barrel, so the part is tightened until the heads meet the work and no further; a hand-tightened pair on a correct engagement feels solid, while the same pair overtightened will strip in the barrel and never come apart again.
The truss head is what makes the joint look deliberate. Its wide, shallow dome covers the hole, gives enough bearing area on thin or soft material, and leaves a clean line when the two heads are aligned — which on a visible album or folder is most of what the customer is buying.
Male female screw fasteners are quoted by the thread size and pitch, the barrel diameter and length, the stud length, the head diameter and height, and the finish. Custom lengths up to 2,000 mm, subject to DFM review after drawing submission. The quotation carries the material, both halves, the heads and the plating.
| Item | How it is defined | What we control |
|---|---|---|
| Barrel | Diameter and internal thread | Thread depth and fit |
| Stud | Diameter and thread length | Thread length and run |
| Heads | Truss, matched pair | Diameter, height and concentricity |
| Grip | Material thickness the pair holds | Set by the two lengths |
| Slot | Single slot in the male head | Width and depth |
| Finish | Eco black zinc | Thickness and lot matching |
The thread is written with its pitch, since at M1 and M2 the pitch is a large fraction of the diameter and two parts of the same nominal size can be incompatible.
The two lengths are given separately. The barrel sets how much material it can pass through, and the stud sets how far it can reach into the barrel; together they define the grip, and neither is a substitute for the other.
The coating is written as a thickness range rather than as a colour, because at this size the thickness is what decides whether the pair runs freely.
Four properties decide this part, and each carries a cost:
| Property | What it gives | What it costs |
|---|---|---|
| Two-piece post | A joint closed from both faces | Two parts to match and to stock |
| Truss heads | Wide bearing area at low height | Heads must be aligned to look right |
| Micro thread | A tiny, discreet fixing | Coating becomes a dimensional factor |
| Black zinc | Uniform dark finish on both halves | Thickness and lot matching matter |
The value is a small two-sided fitting that closes a visible joint without a nut or a washer, in a finish that reads as one part rather than two.
The cost is that every tolerance is compressed, which is why male female screw fasteners of this size are quoted with the thread, the coating and the heads as one specification rather than three. The thread, the coating and the alignment all have less room than on a larger post, and the pair is only good when all three agree.
The recorded finish is eco black zinc, applied to both halves. On this size the film is part of the fit: it adds to the male thread and subtracts from the female clearance, so the thickness is specified as a range and the threads are gauged after plating.
| Option | How it protects | Effect on a micro thread | Typical use |
|---|---|---|---|
| Eco black zinc | Sacrificial zinc plus dye | Thin film; thread gauged after plating | Albums and folders |
| Black oxide | Conversion layer | Nearest to zero build | Dry indoor parts |
| Nickel | Hard barrier layer | Builds; engagement re-checked | Visible hardware |
| Plain | None | No build; rusts in damp | Trial and process samples |
| Stainless body | No coating needed | No build; stronger thread | Marine and outdoor goods |
Black zinc is chosen here because a black pair reads as a single fitting on a dark cover, and because a thin film can be allowed for in the thread at this size if the blank is set for it.
Where the pair is used on leather or on a product that lives outdoors, stainless is the better body: a black zinc film on an M1.6 thread is thin enough to wear off at the slot and the first thread, and the part then rusts at the one place that is handled.
Three products where a two-sided micro fitting earns its place:
| Where it sits | The pair binds covers and leaves that have to be added to after delivery. |
| When it goes wrong | The pair loosens, or the two heads sit off-centre. |
| Why it happens | The grip is wrong for the thickness, and the two halves came from different lots. |
| What we control | Grip matched to the book; both halves plated in one lot and assembled by hand. |
| Where it sits | The fitting holds a tag to a product where both faces are seen. |
| When it goes wrong | The tag rotates on the post, or the heads stand off the surface. |
| Why it happens | The barrel is longer than the tag is thick, so the heads never meet the material. |
| What we control | Barrel and stud lengths set from the tag thickness; sample assembled. |
| Where it sits | The pair joins two leather panels with no access behind. |
| When it goes wrong | The leather tears at the hole, or the heads mark the grain. |
| Why it happens | The bearing area is small for the leather, and the post is short for the panel. |
| What we control | Head diameter and grip agreed with the leather; sample pulled and inspected. |
Four points that decide whether a micro pair runs freely and seats square:
|
Thread and coating written together
The drawing gives the thread pitch and the coating range, because at micro sizes the film is part of the fit. Basis: Coating treated as a dimension. |
Both halves in one lot
Male and female are plated together, so the pair that runs in the sample runs in the batch. Basis: Halves matched by lot. |
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Assembled by hand
The first article is assembled by hand through the customer material and checked for free running and alignment. Basis: Free running proved. |
Same grip, same heads
Barrel and stud lengths and head geometry are recorded with the drawing revision, so a repeat pair matches. Basis: Same fit across lots. |
A micro male female pair is judged by feel: it should run freely, stop when the heads meet the material, and sit straight. These four points are what makes that feel the same in the second lot as in the first.
The male and the female are made as separate parts: the stud is headed and threaded with a slot cut into its truss head, the barrel is headed and drilled and its internal thread cut, and both are zinc plated and dyed black in the same lot. The first piece of every run is measured on head, barrel, thread and length, and assembled by hand.
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The internal thread in the barrel is the harder of the two on a micro size. The bore is small, the tap is fine and fragile, and the depth of thread available is only a few turns, so the barrel is drilled and tapped in one setup and checked with the stud that will be shipped with it.
The slot in the male head is cut before plating and checked with the blade afterwards. On a head this small the slot is a significant part of the face, and a slot that is cut too deep or off-centre shows immediately on a finished album.
Plating is set with the thread in mind rather than with the colour. The film has to be thick enough to protect the steel and thin enough that the pair still runs; both halves are plated in the same charge so they carry the same film.
What decides whether a batch of male female screw fasteners passes is the thread that runs, the coating that does not close it and the alignment of the two heads. The inspection agreement covers all three.
Heads and barrel on the projector |
Threads gauged after plating |
Material checked |
Salt-spray testing of the coating |
The threads are gauged on the plated parts, male and female as a pair. A pair that passes separately can still bind when they are run together if the two films differ, so the assembly test is the one that counts.
The heads are measured for diameter and height and checked for concentricity when the pair is assembled. On a truss head the dome is the visible face, and a pair that is half a millimetre off-centre is obvious on a black cover.
The slot is measured for width and depth and tested with the blade, and the coating thickness is recorded on both halves. At this size those two numbers together decide whether the finished pair can be driven and undone by hand.
Every batch of male female screw fasteners is traceable to the wire and to the plating lot, with the male and female recorded as a matched pair. The material certificate states the grade, the heat number and the mechanical properties, and the plating record carries the coating thickness for both halves.
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 both halves and the pairing, and the plating record. The records carry the batch number, so a repeat order can be compared with the first on the two numbers that decide the feel: thread gauging after plating and coating thickness.
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 micro pair the first article is assembled by hand through the customer material, because the feel and the alignment are what the customer judges. 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 heading cells 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 |
The coating adds to the male thread and reduces the female clearance. At micro sizes the film is part of the fit.
The barrel or the thread is not square, or the pair was assembled from parts of two different lots.
Until the heads meet the material. The barrel has only a few threads, so overtightening strips it.
They can, but at this size they should be kept as a matched pair, because the coating is part of the fit.
At the slot and the first thread, where it is handled. Stainless is the answer for a part that is opened often.
Thread and pitch, barrel and stud lengths, head diameter and height, the slot, the grip and the coating range.
How a male female screw fastener project runs from drawing to repeat delivery:
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1
Send the drawing and the material stack
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→ |
2
Thread, grip and heads agreed
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→ |
3
First article assembled by hand
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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 used for the first article is what repeat orders are checked against.
For a quotation, send the drawing with the thread and pitch, barrel and stud lengths, head diameter and height, the slot and the coating range.
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Thread
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Barrel
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Stud
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Heads
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Grip
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Coating
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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
