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:Aluminum socket head screw
Materials:Aluminum
Surface treatment:Hard anodized purple
Head Type:Low head
Drive type:Hex socket (Allen)
Thread:Machine thread
Forming:Single-die cold heading
Number:1699
We manufacture small allen screws in aluminum with a low head, a hex socket and a machine thread, from M1.6 to M6, cold headed and hard anodized in purple or another agreed colour. Head height, socket size, thread class and anodized colour are made to your drawing.
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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.
A small allen screw is a compact socket head screw driven with an Allen key instead of a screwdriver. The one on this page is made in aluminum with a low head, a hex socket and a machine thread, and hard anodized in purple, so it is chosen where the joint is small, the head has to stay low, and the finish is part of the look.
Low head. A small allen screw is often picked because a standard socket head cap screw is too tall for the space. The low head keeps the profile down, but it also limits how deep the socket can go, so the head height and the socket depth are designed together.
Hex socket. The socket is a hexagon formed into the head and driven with an Allen key. Key size, socket depth and socket width across flats are what the tool engages, and on a small screw the difference between a 1.5 mm and a 2 mm key is the difference between a clean drive and a rounded socket.
Aluminum and hard anodizing. Aluminum gives a light part that takes a hard anodic layer, and the layer is part of the metal rather than a coating on it. That is what allows a small allen screw to carry a purple, black or clear finish through handling while the thread and the socket still have to gauge after the process.
Together these decide whether the part works: the head stays low, the key engages the socket, and the thread and the anodized colour hold to the drawing.
On this small allen screw the body is aluminum, formed on a single-die header and hard anodized after the thread is rolled. The alloy comes from the drawing, and the wire or bar lot stays traceable to the material certificate.
The low head is formed in the die together with the socket. Because the head is shallow, the socket punch has less material to work in, and the depth of the hex is set by what the head can carry without the corners breaking through the top face.
The thread is a machine thread, rolled before anodizing. Hard anodizing builds a layer on every surface, so the thread and the socket are checked after the bath, in the condition the customer assembles.
The purple finish is a hard anodized layer, dyed and sealed. It is a wear layer as well as a colour layer: the oxide is harder than the aluminum under it, which is why a small allen screw that is assembled and re-assembled keeps its colour at the socket edges longer than a painted part would.
Small allen screws of this type are quoted from M1.6 to M6 and in lengths up to 60 mm, with the head height and the socket measured on the projector and the thread gauged. Where a long version is required, custom lengths up to 2,000 mm are subject to DFM review after drawing submission.
| Item | How it is defined | What we control |
|---|---|---|
| Head diameter and height | The low head that must clear the assembly | Checked on the projector on the first article |
| Hex socket size | The Allen key that drives the screw | Checked with the key and on the projector |
| Socket depth | Engagement depth in a shallow head | Checked on the projector after anodizing |
| Thread size and length | Machine thread to the drawing | Gauged per batch after anodizing |
| Anodized dimensions | Thread and socket read in the finished condition | Gauged and key-checked after the bath |
| Total length | From the top of the head to the tip | Datum stated on the drawing; measured on the shop plate |
Each size is quoted against the joint it closes. A small allen screw that is right for one cover can be too tall for the next, so the head height and the clearance are reviewed with the drawing rather than picked from a table.
Head height is measured from the bearing face, and the total length from the top of the head. The batch is checked on the features the process can drift on: socket depth, head height and thread class, all read after anodizing.
The hex socket is the drive of a small allen screw, and on a low head it is the feature with the least room. The socket has to be deep enough for the key to engage without rocking, and shallow enough that the head does not open through the top face when the screw is driven to torque.
Key fit is checked with the key that will be used on the line. A socket that is a few hundredths wide lets the key rock, and the corners round first at the bottom, where the key has the least engagement. That damage is not visible until the screw is removed and re-driven.
Hard anodizing makes the socket smaller by the thickness of the layer on its walls. On a small allen screw that build-up matters: the socket is gauged and key-checked after the bath, and where the drawing requires a free fit the socket is masked before anodizing.
| Socket item | Why it matters on a low head | What we control |
|---|---|---|
| Across flats | It is the key size | Checked with the key and on the projector |
| Socket depth | Engagement and head strength | Checked on the projector after anodizing |
| Socket form | Hexagon corners that take the torque | Formed with the punch and checked on the sample |
| Anodized socket | The layer changes the fit | Key-checked after the bath; masked where specified |
This small allen screw is hard anodized in purple. Hard anodizing grows a thicker, harder oxide than decorative anodizing, and the dye goes into that layer before it is sealed, so the colour is part of the surface rather than a film on top of it.
| Finish | How it protects | Effect on socket and thread | Typical use |
|---|---|---|---|
| Hard anodized purple | Thick oxide layer, dyed and sealed | Socket and thread build; checked after | Colour-coded and visible small screws |
| Hard anodized black | Thick oxide layer, black dye | Same build-up; checked after | Black instrument hardware |
| Clear anodized | Oxide layer, no dye | Same build-up; key-checked after | Parts that keep the metal look |
| Decorative anodized | Thinner dyed oxide layer | Smaller build-up; colour checked to sample | Indoor visible parts |
| Zinc plated (steel equivalent) | Sacrificial zinc layer | Build-up on thread; gauged after | Steel parts where colour is not required |
Colour is matched to an accepted sample under agreed light. Anodized batches shift with alloy, bath and dye lot, so a purple small allen screw from one run can sit a shade away from the next, and the sample and the acceptance range are fixed before production.
Packing protects the low heads and the socket edges. Screws are packed in layers so the heads do not rub, and the label carries the batch, the alloy and the colour reference.
Three assemblies where small allen screws are chosen for the low head and the key drive, and what the screw has to do instead:
| Where it sits | The screw closes a bracket or a cage where the head has to stay below the surface and the space for a driver is small. |
| When it goes wrong | A head that stands proud fouls a sliding plate, and a socket that is too shallow rounds under the key. |
| Why it happens | The parts are small, the stack is tight, and the screws are removed and re-fitted during set-up. |
| What we control | Head height and socket depth checked, and the key fit confirmed after anodizing. |
| Where it sits | The screw holds a frame or a mount where every gram counts and the parts are assembled by hand. |
| When it goes wrong | An aluminum screw that is over-torqued strips its thread, and a low head that is too thin cups under the key. |
| Why it happens | The frame is light, the screws are small, and the joint sees vibration in service. |
| What we control | Thread class and head height on the drawing, and the driving torque agreed with the joint. |
| Where it sits | The screw fixes a mount or a cover where the head must not enter the optical path and the colour marks the assembly. |
| When it goes wrong | A head that is not flat tilts the mount, and a colour that is off the sample reads as a wrong part on the bench. |
| Why it happens | The assembly is precise, the parts are colour-coded, and the screws are visible. |
| What we control | Head flatness and socket checked on the projector, and the colour compared with the sample per batch. |
Four reasons that matter on a small allen screw with a low head and a hard anodized finish, each tied to what the drawing has to prove:
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Head height and socket depth reviewed together
The low head, the socket depth and the key size are reviewed before the die is cut, so a head that cannot carry the socket is raised with you first. Basis: Drawing reviewed for head height and socket depth. |
Headed, threaded and anodized in one flow
The low head and the hex socket are formed in the die, the thread is rolled, and the parts go to hard anodizing as a batch with the colour reference, so socket and thread come from the same run. Basis: Heading and anodizing recorded per batch. |
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Socket key-checked after anodizing
The socket is checked with the Allen key and the head on the projector after the anodizing bath, so the part that passes is the part the key engages. Basis: Socket and head measured in the anodized condition. |
First article to repeat production
The first article fixes the drawing revision, alloy lot, die set and anodizing batch; repeat orders are compared against that record. Basis: First article and colour sample signed off before the batch. |
Shi Shi Tong forms these small allen screws on a single-die header: the low head and the hex socket are struck in the die, the thread is rolled on the same machine, and the parts go to hard anodizing as a batch. The first part of every run is measured on the head and checked with the Allen key before the batch continues.
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Between runs the die insert is changed to the drawing head and the socket punch to the key size; the first parts go to the projector and the key check before the run continues, and the setting is recorded. Anodized parts are checked again after the bath, so the record covers both the formed and the coloured condition.
What decides whether a small allen screw passes is not the colour alone: it is the head height and flatness, the socket width and depth, the thread class and the anodized layer. The inspection agreement covers those, and the criteria come from the drawing.
Thread gauging after anodizing |
Head height and socket on the projector |
Hardness testing of the aluminum alloy |
Salt-spray testing of the anodized finish |
Each batch is recorded against the drawing revision: head and socket from the first article, the key fit checked, the thread gauged after anodizing, and the colour compared with the sample under agreed light. If a gauge or the colour check fails, the parts back to the last good setting are held and re-checked.
Where a third-party report is required for the alloy or the anodized finish, it is listed on the drawing so the paperwork ships with the parts, and the batch number on the label matches the record used for inspection.
Every small allen screw shipment is traceable to the aluminum it was made from. The alloy, lot 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 alloy or the finish. 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. Colour-critical small allen screws are approved on a physical sample rather than a file, so the purple is signed off under the light the customer uses. Buyers visit during the process to review samples and to see how the heads and sockets are formed.
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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 header and the anodizing 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 compact socket head screw driven with an Allen key. This one has a low head, a hex socket and a machine thread, and is made in aluminum with a hard anodized purple finish.
The low head keeps the profile down where a standard cap screw would stand proud. It also limits the socket depth, so the head height and the socket are designed together, not picked separately.
Yes. Hard anodizing builds a layer on the socket walls and on the thread, so the socket is key-checked and the thread gauged after the bath, in the condition the customer assembles.
Small allen screws of this type are quoted from M1.6 to M6 and in lengths up to 60 mm. Where a long version is required, custom lengths up to 2,000 mm are subject to DFM review after drawing submission.
The colour is matched against an accepted sample under agreed light. Anodized batches shift with alloy, bath and dye lot, so the sample and the acceptance range are fixed before production.
Head diameter and height, hex socket size and depth, thread size and length, total length and datum, alloy, anodized colour and finish, driving torque and quantity.
How a small allen screw project runs from drawing to repeat delivery:
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1
Send the drawing or sample
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2
Head and DFM review
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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 a small allen screw quotation, send the drawing with the head diameter and height, hex socket size and depth, thread size and length, total length and datum, alloy, anodized colour and finish. Head and socket are confirmed with you before production.
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Head diameter and height
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Socket size and depth
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Thread size and length
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Total length and datum
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Alloy and anodized colour
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Quantity and torque
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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
