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:Torx Machine Screws Stainless
Materials:Stainless Steel
Surface treatment:Plain + Nylok Patch
Head Type:Pan head
Drive:Torx Recess
Thread:Machine Thread
Point:Blunt
Forming:Nylon Patch Applied After Passivation
Size:M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M14
Number:306
We make Torx machine screws stainless in passivated stainless steel, a pan head with a six-lobe recess and a nylon patch on the thread, quoting them from M1 to M14. Recess, patch position and joint torque are agreed up front, and the first article is driven and re-driven in your joint.
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.
Torx machine screws stainless are pan head machine screws with a six-lobe star recess and a nylon patch on the thread, made in passivated stainless. The star drive gives a controlled torque, the nylon patch gives a controlled prevailing torque, and the stainless body makes the joint survive where a plated screw would not. This family is quoted from M1 to M14 with Number 306.
Torx recess. Six lobes with near-parallel flanks, so the bit stays seated and the torque can be set rather than guessed.
Nylon patch. A patch of nylon applied to the thread and dried. It deforms as the screw is driven and generates prevailing torque without glue or cure time.
Pan head. A low dome with a wide flat bearing face, standard for machine screws.
Plain stainless. Passivated and uncoated, so the recess and the thread are as made.
In use Torx machine screws stainless are chosen where a plain stainless joint would either gall shut or work loose, and the assembly needs the same result every time.
Stainless has a locking behaviour of its own: it galls. Two stainless surfaces under pressure can cold-weld, and the result is a joint that either will not loosen or will not open at all. That is not a locking feature, it is an accident, and it happens unpredictably from one assembly to the next. The nylon patch on these screws exists to replace that accident with a number.
On Torx machine screws stainless the patch works by interference, not chemistry. A nylon patch is applied to a band of the thread and dried, so the screw arrives with a slightly raised, slightly textured section. When it is driven into a nut or a tapped hole, the nylon is compressed into the clearance and pushes back, giving a prevailing torque that is set by the patch — the same on the first screw and the thousandth.
That is what makes Torx machine screws stainless usable on a torque-controlled line. The star recess lets the driver hold a set torque without slipping, and the patch lets the joint behave the same each time, so the two features are matched: one controls what goes in, the other controls what stays. Neither is worth much without the other on this part.
The nylon also has advantages over an adhesive patch in a stainless joint. It needs no cure, has no shelf life to track, and can be re-used a few times before the prevailing torque falls away. On a joint that is opened for service, that is the difference between a screw that still holds and one that has to be replaced after the first visit.
The patch position is the detail that decides whether any of it works. Nylon has to sit on the part of the thread that engages the nut; a patch below the engaged length does nothing, and one that runs up to the head adds drag where the joint should be free. It is specified as a length and a position, not as a general instruction to add a patch.
The recorded range is M1 to M14, covering M1, M2, M3, M4, M5, M6, M7, M8, M9, M10 and M14. Custom lengths up to 2,000 mm are subject to DFM review after drawing submission. For Torx machine screws stainless the quotation carries head diameter and height, recess size and depth, the thread, and the patch type, its length and its position on the thread.
| Item | How it is defined | What we control |
|---|---|---|
| Head | Pan head, flat face | Head diameter and height |
| Recess | Torx, six-lobe star | Recess size and depth |
| Thread | Machine thread | Pitch and length, gauged per batch |
| Patch | Nylon patch on the thread | Patch length, position and thickness |
| End | Blunt, chamfered | Chamfer cut, not deburred |
| Finish | Passivated stainless | Surface condition and film |
Patch length and position are worth fixing on the drawing even when the thread is standard. The joint needs prevailing torque over the engaged turns, and those turns are defined by the nut, not by the screw. A patch that runs from the point upward for the right length is what the assembly is designed around; a patch in a different place changes the feel of the joint and the torque it takes.
Head and recess size follow the thread, and on a small size the recess is worth confirming. A recess one size small on an M2 head is harder to drive and more easily damaged, and on a stainless screw there is no plate to hide the damage.
Three features define this part: the star recess, the nylon patch and the stainless body. The first controls insertion, the second controls retention, and the third is why the joint can live in a damp place without a coating.
| Feature | What it gives | What it costs |
|---|---|---|
| Torx recess | Set torque without cam-out | Exact bit required |
| Nylon patch | Repeatable prevailing torque | Limited re-use; patch position matters |
| Pan head | Load spread on thin panels | Stands proud of the surface |
| Stainless body | No coating to chip or wear | Galls if driven dry and hard |
| Passivated finish | Clean, weld-free surface | Not a lubricant |
For Torx machine screws stainless the combination is what a designer wants on equipment assembled in volume and serviced occasionally: a joint that goes together at a known torque, stays together under vibration, and can still be opened with the right bit. Each of the three features contributes to one of those, and none of them alone would be enough.
The limit is the re-use. Nylon deforms each time it is compressed, so the prevailing torque falls with every cycle. A joint that is opened every week is not the application; a joint that is set once and opened once a year is. Where the joint has to be cycled, a different locking method — or a plain screw with a controlled torque — is the better answer.
The recorded finish is passivation, with the nylon patch applied afterwards. The order is fixed by the process: the parts are cut, rolled and passivated, and only then is the patch applied, because a patch that went through the passivation line would be removed or degraded. Passivation leaves the thread as rolled and gives the alloy its corrosion resistance without adding thickness.
| Option | How it locks | Effect on thread and recess | Typical use |
|---|---|---|---|
| Stainless, nylon patch | Nylon interference, re-usable a few times | Thread as made; patch on the band | Vibrating stainless joints |
| Stainless, adhesive patch | Cured adhesive in the gap | One-shot; shelf life tracked | Sealed, once-only joints |
| Stainless, plain | Friction and galling only | Unpredictable prevailing torque | Static joints, low torque |
| Steel, nylon patch | Nylon interference | Plate under the patch | Indoor vibrating joints |
| Steel, zinc + serrated head | Mechanical key at the head | Marks the panel | Hard panels, hidden joints |
On Torx machine screws stainless, the nylon patch is the answer for a joint that is both corrosive and vibrating. Where the joint is corrosive but static, a plain stainless screw is enough; where it vibrates but stays dry, a plated steel screw with the same patch is cheaper. The material and the locking method are separate decisions that happen to be made together here.
One thing the patch does not do is lubricate. A stainless thread with a nylon patch can still gall if it is driven dry and hard, and galling under a patch will feel like a very high prevailing torque rather than a smooth drag. Where the joint is dry and tight, a small amount of lubricant on the thread before the patch is applied is the practical answer.
Three assemblies where Torx machine screws stainless are the fixing:
| Where it sits | The screw fixes a bracket or a plate on machinery that runs continuously and is washed or exposed, where a plain screw would work loose. |
| When it goes wrong | A plain stainless joint either galls shut or loosens, and neither outcome is repeatable. |
| Why it happens | The joint vibrates, it is stainless, and it is set once. |
| What we control | Patch position checked, first article driven and re-driven at the joint torque. |
| Where it sits | The screw closes a cover or holds a guard where the surface is cleaned daily and the fastener has to stay put between services. |
| When it goes wrong | A plated screw rusts at the recess, and an adhesive patch cannot be relied on in a wet assembly. |
| Why it happens | The joint is wet, it vibrates, and it is serviced on a schedule. |
| What we control | Grade confirmed, patch coverage inspected, first article driven wet. |
| Where it sits | The screw fixes a mount where the torque has to be set precisely and the joint must not drift after adjustment. |
| When it goes wrong | A cam-out changes the torque, and an uncontrolled thread friction makes the setting irreproducible. |
| Why it happens | The torque is set, the joint is fine, and the part is stainless. |
| What we control | Recess driven with the exact bit, prevailing torque measured on the first article. |
Four reasons that matter on a locking stainless screw, each tied to what the drawing has to prove:
|
Patch position and torque agreed
The patch length, its position and the joint torque are confirmed together, because nylon that does not sit on the engaged thread contributes nothing to the lock. Basis: Patch position and torque agreed. |
Passivate first, patch last
The screw is formed and passivated, and the nylon patch is applied afterwards and dried, so the patch is not degraded by the finishing line. Basis: One route with the patch as the last step. |
|
Prevailing torque measured
The first article is driven, removed and re-driven while the prevailing torque is measured, because that number is the whole reason for the part. Basis: Prevailing torque recorded on first and second assembly. |
First article fixes the setting
The first article fixes the wire, the recess punch, the passivation and the patch; repeat orders are compared against that record. Basis: First article signed off before the batch is released. |
Shi Shi Tong forms these Torx machine screws stainless from stainless wire on single-die headers that form the pan head and the six-lobe recess in one stroke, rolls the machine thread, passivates the parts and applies the nylon patch in the specified band before packing. The first part of every run is measured on the head and recess, driven to check the prevailing torque and entered into a thread gauge before the batch continues.
|
|
On Torx machine screws stainless the patch station is the part of the route that has nothing to do with metal and everything to do with consistency. Thickness, coverage and drying all have to be held, and a batch packed before the nylon is dry arrives as a block. The station is set up per batch, and the first article is checked for coverage and for prevailing torque before the run continues.
What decides whether Torx machine screws stainless pass is the patch, the recess, the thread and the alloy. The inspection agreement covers those, and the criteria come from the drawing.
Head and recess on the projector |
Thread gauged per batch |
Hardness checked on the wire |
Salt-spray testing of the grade |
On Torx machine screws stainless the patch is checked for position, length and coverage before and after drying, and the prevailing torque is measured on the first and second assembly of the first article. The recess is checked for size and depth and driven with the production bit, and the thread is gauged per batch.
The alloy is confirmed on the certificate, and a salt-spray sample is run where the customer’s environment asks for it. On a patch-locked screw the interesting failure is not the thread but the patch: a patch that is too thin locks nothing, and one that is too thick makes the joint feel cross-threaded.
Every shipment of Torx machine screws stainless is traceable to the wire it was made from, to the passivation batch and to the date the patch was applied. The grade and heat number are recorded on the material certificate supplied with the parts, and the patch date is kept with the inspection file.
ISO 9001:2015 |
RoHS test report |
Registered trademark |
Patent: security screw and driver |
With each batch we supply the material certificate, the inspection record including the prevailing torque result, and the patch date. The documents carry the drawing revision and the batch number, so a repeat order is made to the same patch position that was approved.
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 locking part the first article is driven and re-driven in the customer’s joint, because the prevailing torque is the function. Buyers visit during the process to review samples and to see how the parts are finished.
|
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 patch station 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 |
Because nylon needs no cure, has no shelf life and can be re-used a few times. That suits a joint that is assembled once and serviced occasionally.
A few cycles before the prevailing torque falls away. It is not designed for a joint that is opened weekly.
On the part of the thread that engages the nut. A patch below the engaged length locks nothing, and one that runs to the head adds drag.
No. It controls prevailing torque, but a stainless thread driven dry and hard can still gall; a little lubricant before the patch helps.
Because the torque has to be set. A star drive stays seated, so the joint can be driven to a defined torque and the patch can be relied on to behave.
Thread size and length, head diameter and height, Torx recess size, the patch type, length and position, and the grade.
How a Torx machine screw stainless project runs from drawing to repeat delivery:
|
1
Send the drawing and the joint it locks
|
→ |
2
Recess, patch position and torque agreed
|
→ |
3
First article driven and re-driven in your joint
|
→ |
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 thread size and length, the head diameter and height, the Torx recess size, and the patch type and position you need.
|
Thread size
|
Length
|
Head diameter
|
|
Torx size
|
Patch length
|
Patch position
|
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
