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:Fully Threaded Socket Head Cap Screws
Materials:Steel
Surface treatment:Nickel Plated
Head Type:Cap Head
Drive:Hexagon socket (Allen)
Thread:Machine thread, full thread
Point:Blunt
Forming:Single Die Heading
Size:M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M14
Number:455
We make fully threaded socket head cap screws in nickel plated carbon steel, with a cylindrical head, a hexagon socket and a thread that runs to the head, quoting them from M1 to M14. Head, socket depth, length, thread and finish come from your drawing, and the first article is assembled at your rated torque.
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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.
These fully threaded socket head cap screws have a cylindrical head with a hexagon socket and a machine thread running the whole length, in nickel plated carbon steel, quoted from M1 to M14 with Number 455.
Full thread. The thread runs from the tip to the underside of the head, with no plain shank.
Socket cap head. A cylinder with a flat bearing face and an internal hexagon, seated in a counterbore.
Nickel plating. A bright barrier deposit over carbon steel, for visible indoor work.
Blunt end. A chamfered end that starts cleanly in a tapped hole or a nut.
Fully threaded socket head cap screws are the form chosen where the engagement has to be maximised: a thin tapped plate, a nut on the far side, or a joint whose depth is set by the assembly rather than by the screw. There is no plain shank, so no length is wasted, and every turn the joint offers is a turn that carries load.
A fully threaded socket head cap screw uses every millimetre of its length. There is no plain shank, so the thread runs up to the underside of the head, and wherever the screw passes through material it is engaged. That is the right form for a joint where the screw goes into a tapped plate, takes a nut, or has to hold at a depth that is set by the assembly rather than by the screw.
The alternative is a half thread, which keeps a plain shank for the parts to slide on. That is the right form when a stack of parts must not be threaded. The choice between them is a choice about the joint, and it is worth making before the length is fixed: a full thread in a joint that needs a plain shank will cut into every plate it passes, and a half thread in a joint that needs full engagement reaches the end of its thread before it is tight.
On fully threaded socket head cap screws the cap head is what makes the full thread usable. It sits in a counterbore with its flat underside on a machined face, and the socket gives the torque without cam-out, so the screw can be tightened to what the full thread can carry. On a thin plate under a counterbore that rings the whole head is what stops the edge of the hole from being pulled up.
Nickel is the finish over all of it. It is a barrier deposit rather than a sacrificial one, so it holds a bright even colour and it is thin enough to leave the thread usable; on a head that is often visible, that evenness is the point of choosing it over zinc.
The one thing full thread costs is the counterbore edge. The thread runs right under the head, so it meets the counterbore face at a sharp corner, and a socket that is over-torqued on a thin plate can pull that corner down. The usual answers are a thicker plate, a washer under the head, or a half-threaded screw with a plain shank at the seat.
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 fully threaded socket head cap screws the quotation carries head diameter and height, socket size and depth, overall length, thread and finish.
| Item | How it is defined | What we control |
|---|---|---|
| Head | Socket cap head | Head diameter, height and face flatness |
| Socket | Internal hexagon | Across flats, depth and corners |
| Thread | Full thread to the head | Pitch, length and gauging |
| End | Blunt, chamfered | Chamfer and thread start |
| Material | Carbon steel | Grade and heat number on the certificate |
| Finish | Nickel plated | Thickness and socket fit |
| Seat | Counterbore in the part | Depth and face flatness |
Head height and socket depth are quoted together. A cap head can be made to the standard and still differ in socket depth between suppliers, and the torque the screw will take follows the shallower one.
The counterbore depth belongs with the drawing too. A cap head that bottoms on a rough pocket holds the head off the face, and the screw then sits on its shank instead of on its bearing face.
Three features define the part: the full thread, the socket drive and the flat bearing face. The first uses the whole length, the second delivers the torque, and the third spreads the clamp.
| Feature | What it gives | What it costs |
|---|---|---|
| Full thread | Maximum engagement in a thin joint | Threads any clearance hole it passes |
| Socket drive | High torque without cam-out | Needs the exact key size |
| Flat bearing face | Full ring of contact in a counterbore | Counterbore must be flat and deep enough |
| Nickel plating | Bright barrier finish indoors | A scratch becomes a rust point |
| Blunt end | Starts cleanly in a tapped hole | Needs a chamfered hole |
The full engagement is the reason fully threaded socket head cap screws exist. In a thin plate with a nut behind it, or in a tapped plate where the screw can only reach a few turns in, the difference between full and half thread is the difference between holding and stripping.
The cost shows up in any joint that has to slide. A thread carried through a clearance hole cuts into it, so a stack that is meant to come apart cleanly needs a half thread instead.
The recorded finish is nickel plating over carbon steel. It is a barrier deposit: bright, hard, and even across a cylindrical head, which is why it suits visible machine work. The trade is that a scratch is a rust point, because there is no surrounding coating to protect the damage.
| Option | How it protects | Effect on socket and thread | Typical use |
|---|---|---|---|
| Nickel plated | Barrier deposit, bright | Socket narrowed; re-checked | Visible machine assemblies |
| Zinc plated | Sacrificial zinc | Thin build; socket re-checked | General indoor work |
| Black oxide | Conversion film, oiled | No measurable build | Internal mechanisms |
| Black zinc plated | Sacrificial zinc, dark | Thin build; wear visible | Dark housings |
| Stainless alternative | Passive film, no build | Socket and thread as made | Wet and food service |
Where the joint is wet, stainless is the specification and the socket is the reason: a rusted socket cannot be re-entered with a key, and a cap head offers nothing else to grip.
Where the joint is visible and dry, nickel is the best of the inexpensive finishes; where it is hidden, zinc or black oxide cost less and protect just as well indoors.
Three assemblies where fully threaded socket head cap screws are the fixing:
| Where it sits | The screw goes into a tapped plate behind a thin cover, where only a few turns of engagement are available and every one counts. |
| When it goes wrong | A half thread leaves too few turns in the plate, and the joint strips at the rated torque. |
| Why it happens | The plate is thin, the thread is tapped, and the engagement is short. |
| What we control | Thread length and socket checked; first article tightened to torque. |
| Where it sits | The screw passes a thin panel and takes a nut on the far side, where the nut can be run to any position along the thread. |
| When it goes wrong | A plain shank stops the nut short of the panel. |
| Why it happens | The joint is thin, the nut is loose, and the clamp is set at assembly. |
| What we control | Thread gauged to the nut; first article assembled. |
| Where it sits | The screw clamps a fixture into a counterbore where the clamp has to be firm and the head flush with the fixture face. |
| When it goes wrong | The counterbore is too shallow, and the head stands proud and bears on its edge. |
| Why it happens | The joint is machined, it is clamped hard, and the head is recessed. |
| What we control | Counterbore depth and head height checked; first article fitted. |
Four reasons that matter on a fully threaded socket screw, each tied to what the drawing has to prove:
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Thread and socket agreed
Thread length, socket depth, head height and finish are agreed as a set, because on fully threaded socket head cap screws the engagement and the drive are the joint. Basis: Thread and socket agreed. |
Headed, fully threaded, plated in one route
The cap head and hexagon are formed in one strike, the full thread rolled to the head and the parts nickel plated within one route. Basis: One route from wire to plated screw. |
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Thread and socket checked
The thread is gauged to the head and the socket checked for depth, because either being short shows up as a joint that will not hold. Basis: Thread and socket checked. |
First article in the joint
The first article is assembled in the customer joint at the rated torque, because the engagement is only proved there. Basis: First article assembled in the joint. |
Shi Shi Tong forms these screws on single-die headers that form the cylinder and cut the hexagon, rolls the thread all the way to the underside of the head and nickel plates the finished parts. The first part of every run is measured on head diameter and height, socket depth, overall length and thread before the batch continues.
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Rolling a thread right up to the head is the step that decides the part. The roll has to finish cleanly under the fillet without marking the bearing face, and a roll that runs a little short leaves a plain band exactly where the design counted on engagement.
What decides whether these screws pass is the thread length, the socket, the head and the finish. The inspection agreement covers those, and the criteria come from the drawing.
Head and thread on the projector |
Thread gauged per batch |
Hardness checked on the wire |
Coating proved by salt spray |
The thread is checked for length to the head, the socket for across flats and depth, and the head for diameter, height and face flatness. The coating is checked for thickness inside the socket, and the thread is gauged after plating.
The first article is assembled in the customer joint and tightened to the rated torque. A screw that engages fewer turns than the drawing expects is a joint that will strip, and only the assembly shows how many it actually gets.
Every shipment of these 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 and socket.
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 fully threaded socket screw the first article is assembled in the customer joint at the rated torque, because the engagement is what the joint depends on. 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 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 |
It engages along the whole length, which is what a thin tapped plate or a nut on the far side needs; a half thread wastes length on a plain shank.
Yes, if one is used. A joint that has to slide needs a half thread instead.
It takes high torque without cam-out and seats in a counterbore, which is what a fully tightened joint needs.
It narrows it slightly, so the socket is checked after plating.
Enough depth for the head and a flat face; a rough pocket holds the head off its seat.
Head diameter and height, socket size and depth, overall length, thread, the grade and the finish.
How a fully threaded socket screw project runs from drawing to repeat delivery:
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1
Send the drawing and the joint it clamps
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→ |
2
Thread, socket and head agreed
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→ |
3
First article assembled at rated torque
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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, socket size and depth, overall length, thread, the grade and the finish.
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Head diameter
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Head height
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Socket size
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Overall length
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Thread
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Finish
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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
