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:Small Long Screws Low Profile Head Phillips
Materials:Steel
Surface treatment:Nickel Plated
Head Type:Low Profile Head
Drive:Phillips (cross)
Thread:Machine thread, half thread
Point:Blunt
Forming:Single Die Heading
Size:M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M14
Number:203
We make small long screws in nickel plated carbon steel with a low profile Phillips head, a long plain shank and a half thread, quoting them from M1 to M14. Overall length, thread length, shank diameter, head and recess come from your drawing, and the first article is assembled through your stack.
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.
Small long screws are thin machine screws with a long shank and a small thread, used where a joint spans more distance than the thread needs. This one has a low profile Phillips head, a half thread and a nickel plated carbon steel body, quoted from M1 to M14 with Number 203.
Low profile head. A head of reduced height with a Phillips recess, made to sit in a shallow pocket without standing proud.
Half thread. The thread runs only along the last section, leaving a plain shank for most of the length.
Long shank. A thin body that passes through the parts being joined and sets the distance between them.
Nickel plated steel. A thin bright deposit over carbon steel, decorative and mildly protective indoors.
Small long screws are specified where the thread has no business running through the whole joint: a stack of plates, a spacer, a recessed cover. The shank does the spanning and the thread does the clamping, and the head stays out of the way at the top.
A half thread is a decision about where the screw does work. The plain shank passes through the clearance holes of the parts being clamped; the thread engages only the last section, in the tapped hole or nut at the far end. The joint is then pulled together by that thread while everything behind it slides on a smooth shank.
That matters on small long screws because the shank protects the bores. If the thread ran the whole length, every turn would cut into each part it passes through, and a stack of thin plates would be threaded instead of clamped. With a half thread, the shank is a sliding fit and the parts stay free until the thread pulls them up.
The length of the plain section is the joint’s clamp distance. It has to match the stack of parts — from the underside of the head to the start of the tapped hole — and both ends of that number are dimensioned: the thread length from the tip and the plain length from the head. A screw that is half threaded but with the wrong division either threads into the stack or does not reach the nut.
The low profile head completes the fit. It sits in a shallow pocket, often in the top plate of the stack, so the head is only a little above the surface and the recess is shallow as a result. The drive is therefore the limit on torque rather than the thread, which on a long thin screw is already the weaker element.
Long and thin also changes how the screw behaves when it is driven. The shank takes up part of the turning effort as twist, and the longer the screw the more noticeable that is; on a small screw with a shallow recess the answer is a steady driver and a clearance hole that is actually clear, not a larger driver.
The recorded range is M1 to M14, with lengths made to the drawing. Custom lengths up to 2,000 mm are subject to DFM review after drawing submission. For small long screws the quotation carries overall length, thread length, plain shank diameter, head diameter and height, recess and coating.
| Item | How it is defined | What we control |
|---|---|---|
| Head | Low profile, Phillips | Head diameter, height and recess depth |
| Shank | Plain section through the stack | Diameter, length and surface finish |
| Thread | Half thread at the tip | Thread length and pitch, gauged |
| End | Blunt, chamfered | Chamfer and thread start |
| Material | Carbon steel | Grade and heat number on the certificate |
| Finish | Nickel plated | Coating thickness and recess fit |
| Shank condition | Must pass the stack without binding | Diameter and handling checked |
Thread length is quoted from the tip, and plain length is what remains. Two screws with the same overall length and different thread lengths are different parts, and the drawing should give both rather than leave one to subtraction.
Shank diameter has to be a sliding fit in the clearance holes. On a long screw the shank passes several parts, and a shank that is a few hundredths over will bind before the thread has engaged anything.
Three features define the part: the long plain shank, the half thread and the low head. The first spans the joint, the second does the clamping at the far end, and the third keeps the fixing out of the way.
| Feature | What it gives | What it costs |
|---|---|---|
| Long plain shank | Clamps without threading the stack | Shank must be a sliding fit |
| Half thread | Thread only where it works | Thread length must be specified |
| Low profile head | Fits a shallow pocket | Shallow recess, limited torque |
| Nickel plating | Bright finish indoors | Build in the recess |
| Carbon steel body | Strength and cost | Needs the coating for corrosion |
The smooth shank is the practical advantage. In a stack of thin plates, a fully threaded screw would cut its own thread into each plate and the joint would no longer come apart cleanly; a half thread keeps every plate as a clearance fit and the clamping where it belongs.
The cost is that the plain length is a dimension the customer must get right. It is quoted against the stack, and a screw that was ordered by overall length alone may still be the wrong part.
The recorded finish is nickel plating over carbon steel. Nickel gives a bright, fairly hard deposit that suits visible small parts and stands up to handling, and on a thin shank it is thin enough that the sliding fit through the clearance holes is not affected in practice. The recess is the place where the deposit matters most.
| Option | How it protects | Effect on shank and recess | Typical use |
|---|---|---|---|
| Nickel plated | Barrier deposit, bright | Thin build; recess re-checked | Visible small assemblies |
| Zinc plated | Sacrificial zinc | Thin build; recess re-checked | Indoor general work |
| Black oxide | Conversion film, oiled | No measurable build | Internal mechanisms |
| Dacromet | Inorganic zinc-aluminium layer | Build allowed at the thread | Wet and outdoor assemblies |
| Stainless alternative | Passive film, no build | Shank and recess as made | Wet and food service |
Where the screw passes through several parts, a coating on the plain shank is a sliding surface and will wear at the entry to each hole. Nickel wears slowly and stays bright; zinc wears through sooner and leaves a dull ring.
Where the joint is damp, the material should change rather than the coating. A long thin carbon steel screw rusts at the shank first because that is the surface with the least protection and the most rubbing.
Three assemblies where small long screws are the fixing:
| Where it sits | The screw clamps a stack of plates through clearance holes where the thread only engages a nut or a tapped end plate. |
| When it goes wrong | A fully threaded screw cuts into every plate, and the stack no longer comes apart cleanly. |
| Why it happens | The joint is a stack, the plates are thin, and the clamp is at the far end. |
| What we control | Plain length quoted against the stack; shank diameter checked for the fit. |
| Where it sits | The screw sits in a shallow pocket in a cover, with a low head so the surface stays level. |
| When it goes wrong | A standard head stands proud, and a deeper pocket would weaken the cover. |
| Why it happens | The pocket is shallow, the cover is thin, and the head is visible. |
| What we control | Head height and recess depth checked; first article fitted in the pocket. |
| Where it sits | The screw passes through a spacer or a sleeve and threads into a component at a distance. |
| When it goes wrong | A shank that binds in the spacer, or a thread that starts too early and grips the spacer. |
| Why it happens | The joint spans a gap, the parts are small, and the alignment is by the shank. |
| What we control | Thread start position checked; first article assembled in the mechanism. |
Four reasons that matter on a long thin part, each tied to what the drawing has to prove:
|
Thread length and plain length agreed
The thread length from the tip and the plain length from the head are both quoted, because on small long screws the division is the joint. Basis: Both lengths quoted separately. |
Headed, threaded, plated in one route
The low head and recess are formed, the half thread is rolled and the parts are plated and re-gauged within one route. Basis: One route from wire to plated screw. |
|
Shank checked for the hole
The plain shank is checked for diameter along its length, because a long shank that binds at one point stops the joint. Basis: Shank checked along its length. |
First article assembled in the stack
The first article is assembled through the customer stack, because the plain length only proves itself in the parts. Basis: First article assembled in the stack. |
Shi Shi Tong forms small long screws on single-die headers that form the low profile head and cut the Phillips recess in one stroke, then draws the long shank, rolls the half thread at the tip and nickel plates the parts. The first part of every run is measured on head height, recess depth, overall length, thread length and shank diameter before the batch continues.
|
|
On a small long screw the shank is the hard part. A thin blank bends easily while the thread is rolled and while the parts are handled, and a bend in the middle of a long shank means the screw will not pass the stack even though both ends are in tolerance; the shank is supported through the route and the parts are packed so that the length is not loaded in transit.
What decides whether small long screws pass is the shank, the thread start, the head and the recess. The inspection agreement covers those, and the criteria come from the drawing.
Head and thread start on the projector |
Thread gauged per batch |
Hardness checked on the wire |
Coating proved by salt spray |
The shank is checked for diameter and for how it runs along its length, the thread start position is measured from the tip, and the head and recess are checked for height, diameter and depth. The thread is gauged, and the coating checked for thickness in the recess.
The first article is assembled through the customer stack. A screw that measures correctly and will not pass three plates is still a part that fails, and a bench measurement cannot show it.
Every shipment of small long 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 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 coating. The documents carry the drawing revision and the batch number, so a repeat order keeps the same thread length and shank diameter.
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 small long screws the first article is assembled through the customer stack, because the plain length is what the joint feels. Buyers visit during the process to review samples.
|
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 |
The plain shank passes through the clearance holes and the thread only engages at the far end, so the parts are clamped rather than threaded.
Thread length from the tip and plain length from the head, quoted separately. Overall length alone does not define the part.
It sits in a shallow pocket in the top part, so the surface stays level. The recess is shallow as a result and the torque is set to it.
It can bind in one of the clearance holes if it is a few hundredths over, or if the part has picked up a bend in handling.
Yes, that is what it is for. The shank is a sliding fit through the stack and the thread engages the end plate or nut.
Overall length, thread length, shank diameter, head diameter and height, recess depth, the grade and the coating.
How a small long screw project runs from drawing to repeat delivery:
|
1
Send the drawing and the stack it passes
|
→ |
2
Thread length, shank and head agreed
|
→ |
3
First article assembled through your stack
|
→ |
4
Batch production and repeat orders
|
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 overall length, thread length, shank diameter, head diameter and height, recess depth, the grade and the coating.
|
Overall length
|
Thread length
|
Shank diameter
|
|
Head height
|
Recess depth
|
Coating
|
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
