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:Extra-long M5 five-lobe cap head screw
Materials:Stainless steel
Surface treatment:Plain
Head Type:Cap head
Drive type:Five-lobe (matching driver required)
Thread:Partial (half) machine thread
Forming:Split-die cold heading (one-piece)
Number:1824
We manufacture extra-long M5 five-lobe cap head screws in stainless steel, with a cylindrical cap head, a five-lobe recess that needs the matching driver, and a partial machine thread, from M1.4 to M12 and up to 2,000 mm, formed one-piece by split-die cold heading and passivated. Head diameter, recess size, thread start and material grade are made to your drawing.
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.
An extra-long five-lobe cap head screw is a long machine screw with a cylindrical head and a five-lobe star recess that needs the matching driver. The head is small enough to sit inside a counterbore or next to a wall, the plain shank runs through the assembly, and the thread engages only at the far end.
Five lobes, one driver. The recess has five rounded lobes rather than six. It takes torque well, but it is not a shape a technician can turn with a hex key or a Phillips driver from a general kit. On equipment that should not be opened without the right tool, that is the point.
Cap head on a long shank. The cylindrical head keeps a tall driving face and a flat bearing face, so the socket depth can be cut without leaving a thin head wall. On a long screw the head also has to carry the part through the panel before the thread bites, which is why the head diameter and the shank are dimensioned together.
Partial thread and plain shank. The unthreaded span passes through panels, spacers and brackets; the thread engages at the far end. That keeps the thread out of the sliding joint and lets the screw travel through a long stack without cutting into the panel bore.
Together these decide what an M5 cap head screw does on site: it closes a panel that should not be opened with a pocket tool, it carries through a long stack without binding, and it can be re-driven during service with the same driver.
On an M5 cap head screw the cap head and the five-lobe recess are made in one die, so the recess stays on the centre line of the shank. That matters more on a long screw than on a short one: any run-out between the recess and the shank shows up as the driver walking sideways as the screw is turned, and the head of a long screw is harder to correct once it starts to cock over.
The five-lobe shape has rounded lobes with a small core, so the driver engages on five flanks and stays centred under torque. The recess depth is set against the head height: too shallow and the driver cams out, too deep and the head loses section over the bearing face. The drawing pairs the two.
Because the driver is specific, the recess is checked with the matching bit rather than by eye. A five-lobe recess that looks correct can still be a few tenths too shallow, and the driver will feel it before it visibly fails.
M5 cap head screws are quoted from M1.4 to M12 and up to 2,000 mm, with length usually held to +0/-2 mm on the drawing. This page covers the M5 class as an extra-long part; custom lengths up to 2,000 mm are subject to DFM review after drawing submission.
| Item | How it is defined | What we control |
|---|---|---|
| Total length | From the top face of the cap head to the tip | Datum stated on the drawing; length measured on the shop plate |
| Head diameter and height | The cap head that carries the drive | Head diameter and height held to the panel counterbore |
| Five-lobe recess size | The star recess that takes the matching bit | Recess cut to the bit size and checked with it |
| Thread length and position | Where the thread starts and how far it runs | Thread start taken from the drawing, not a sample |
| Plain shank length | The unthreaded span through the stack | Shank diameter and length held to the parts it passes through |
Each diameter and length combination is checked against the drawing before a quotation is issued. A long M5 cap head screw and a short one in the same recess class take different routes through heading, and the check confirms that the route can hold the length and the recess at the same time.
On an M5 cap head screw, length is measured from the top face of the head, and the thread length is read as a position from the same datum. Head diameter, recess depth and thread start are gauged on the first article before a batch is released, because those three dimensions decide whether the driver engages and whether the thread reaches the tapped part.
For an extra-long M5 cap head screw the drawing fixes six things: thread size and pitch, thread length and position, plain shank length, total length and its datum, head and recess dimensions, and right- or left-hand direction. A seventh line matters on stainless parts: the grade and the surface condition the parts are supplied in.
| Parameter | Why it matters on a long screw | What we control |
|---|---|---|
| Thread start position | It sets where the plain shank ends and where the stack sits | Start dimension checked on the first article and per batch |
| Engaging length | Too short leaves the joint weak; too long runs the thread into the stack | Thread length and position taken from the drawing |
| Recess size and depth | The matching bit must seat fully without bottoming | Recess gauged with the matching five-lobe bit |
| Handedness | A left-hand thread on a right-hand assembly will not pull the joint closed | Direction marked on the part and on the packing |
A stainless M5 cap head screw is supplied with the metal as the finish, passivated after forming and thread rolling so the passive film is restored and free iron from tooling is removed. There is no plated layer filling the recess or building up the thread, so the matching bit still seats and the thread still gauges at the class on the drawing.
| Finish | How it protects | Effect on recess and thread | Typical use |
|---|---|---|---|
| Passivated stainless | Forming residue removed, passive film restored | No dimensional change; recess stays as formed | Stainless assemblies, indoor and damp service |
| Electropolished stainless | Surface levelled and enriched in chromium | Edges smoothed; recess checked after polishing | Laboratory, hygienic and instrument equipment |
| Passivated plus light oil | Passive film plus a temporary barrier for transit | No dimensional change; oil cleaned before use | Parts stored before assembly |
| Zinc electroplated (carbon steel) | Sacrificial zinc layer | Build-up in the recess; bit checked after plating | Carbon steel parts in dry indoor service |
| Dacromet flake (carbon steel) | Zinc-aluminium flake layer | Thin film; recess checked over the coating | Wet or outdoor carbon steel assemblies |
Plain stainless parts are checked for finish and cleanliness rather than salt spray; salt-spray exposure is agreed only where the drawing specifies a coating. The recess is cleaned after passivation and checked again with the matching bit, because a dry residue in a small star recess is enough to stop the bit seating.
Packing protects the head and the thread. Long M5 cap head screws are packed in layers with the heads supported, so the shank cannot take a set under its own weight, and the recess is kept away from the carton wall. Batch and material information go on the label.
Three assembly conditions where an extra-long M5 cap head screw has to hold a stack and resist casual access, and what it has to do instead:
Self-service kiosks and vending equipment
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Vending equipment – panels that resist casual access |
Electrical and control cabinets
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Control cabinets – service panels held with a specific driver |
Battery module and energy storage racks
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Energy storage – module frames clamped through a long stack |
Four reasons that matter specifically on an extra-long M5 cap head screw, each tied to what the drawing has to prove:
|
Engineering review before tooling
Head diameter, recess depth and thread start are settled before a die is cut, so the first sample is measured against the drawing instead of against a guess. Basis: Drawing or sample reviewed before tooling is released. |
One piece, formed in a split die
A long five-lobe cap head screw is headed in one piece on a split-die header. A welded shank is never the default, so no joint can hide under the passivation. Basis: One-piece split-die heading route, no welded shank. |
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Recess checked with the matching bit
The five-lobe recess is checked with the matching bit, so the driver that works on the bench is the driver the customer uses in service. Basis: Recess gauged with the matching five-lobe bit. |
First article to repeat production
The first article fixes the drawing revision, material heat, die set and tooling for the recess; repeat orders are compared against that record. Basis: First article signed off before the batch is released. |
These M5 cap head screws are formed, not assembled. Stainless wire goes through the heading aisle; on a split-die header the die opens along the shank so the head and the first part of the shank come from the same billet, the five-lobe recess is formed with the head, and the thread is rolled after forming. The operator checks the first parts against the drawing before the run is released.
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Between runs the die insert is changed to the drawing head form and recess size; the first parts go to the gauges before the run continues, and the setting is recorded. Long parts are packed in layers so the shank is supported over its length rather than hanging from the head.
What decides whether an M5 cap head screw passes is not its appearance: it is the head sitting in the counterbore, the recess taking the matching bit, and the thread matching the tapped part. The inspection agreement covers those, and the criteria are the ones written on the drawing rather than a generic standard.
Thread gauging against GO/NO-GO gauges |
Head and recess profile on the optical projector |
Hardness testing of the base material |
Salt-spray testing where a coating is specified |
Each batch is recorded against the drawing revision: head and recess from the first article, the recess checked with the matching bit, thread gauging per batch, and the material heat on the certificate. If a gauge or the recess check fails, the parts back to the last good setting are held and re-checked before anything ships.
If the material needs an outside report, the drawing calls for it, the paperwork travels with the shipment and the batch number on the label matches the inspection record.
Every M5 cap head screw shipment is traceable to the material it was made from. The grade, heat number and standard 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 material. The documents carry the drawing revision and the batch number, so the paperwork can be matched to the parts.
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. Buyers visit during the process to review samples and to see the forming, threading and finishing steps their parts will go through.
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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 header, the thread rolling and the finishing 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 |
It is a machine screw with a cylindrical cap head and a five-lobe star recess that needs the matching driver. The recess takes torque on five flanks, and the shape is not turned with a hex key or a Phillips driver from a general kit.
Five lobes resist casual access while still taking production torque. The driver is specific to the screw, so panels are opened by people who carry the right tool rather than with whatever is in a pocket.
Five-lobe cap head screws are quoted from M1.4 to M12 and up to 2,000 mm, with length usually held to +0/-2 mm. Custom lengths up to 2,000 mm are subject to DFM review after drawing submission.
This part is specified with a partial machine thread: the plain shank passes through the stack and the thread engages only at the far end. Thread length and start position come from the drawing.
With the matching five-lobe bit after finishing: the bit must seat to the recess depth without bottoming, and the recess is formed concentric with the shank so the driver does not cock over under torque.
Thread size and pitch, thread length and position, plain shank, total length and datum, head diameter and height, five-lobe recess size, material grade, surface condition, and quantity.
How an M5 cap head screw project runs from drawing to repeat delivery:
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1
Send the drawing or sample
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→ |
2
DFM review and quotation
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→ |
3
First article approval
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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 an M5 cap head screw quotation, send the drawing with thread size and position, plain shank and total length with its datum, head diameter and height, recess size, material grade and surface condition. Head, recess and thread start are confirmed with you before production.
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Thread size, pitch and length
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Plain shank and total length
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Head diameter and height
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Five-lobe recess size
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Material grade
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Surface condition and quantity
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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
