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+86 13143444311
Email：sst@szsst88.com
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Address：Building 9, First Industrial Zone, Tantou Industrial City, Songgang Street, Baoan District, Shenzhen 518105, Guangdong, China
Type:Stainless Steel Thread Cutting Screw, Pan Head Phillips, Full Thread (Non-Standard)
Materials:Stainless Steel; grade and condition per drawing
Surface treatment:Plain, cleaned (no applied coating, no plating, no oil film)
Head Type:Pan Head (low dome, flat bearing ring, no flange)
Drive:Phillips cross recess (four tapered wings, pointed centre)
Thread:Coarse single-lead thread, rolled, full length under the head
Point:Blunt end with one axial cutting slot; the thread is cut, not displaced
Size:M1 M2 M3 M4 M5 M6 M7 M8 M9 M10 M14
Forming:Single-die heading (head and slot in one blow), thread rolling, cleaning, slot deburring, sorting
Number:737
We manufacture stainless steel thread cutting screws with a pan head Phillips drive, a coarse thread full length under the head and a single axial cutting slot at a blunt end. Slot form, thread, length, pilot hole and stainless grade are taken from 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.
Stainless steel thread cutting screws are screws that cut their own thread in a prepared hole, made in a stainless alloy so the fixing itself survives the environment. The recorded item on this page is a pan head Phillips screw with a coarse thread running the full length under the head and a blunt end with a single axial cutting slot, in plain stainless with no coating, quoted from M1 to M14 with Number 737.
One axial slot. A single slot runs along the point and opens onto the blunt end. As the screw turns, the slot’s edge cuts a thread in the hole wall instead of displacing the material, and the slot also gives the chip a path out.
Full thread under the head. There is no plain shank, so the whole length below the head carries thread and engages. On a cutting screw that matters: the thread is the cutting tool as well as the fastener.
Pan head, Phillips. A low dome on a flat bearing ring with a cross recess. It takes a standard bit, centres itself, and gives way before the head splits.
Stainless, uncoated. No plating, no passivation specified and no oil film: the alloy does the protecting, and the thread that is cut is the thread that ships. That keeps the cutting edge as formed, which is what stainless steel thread cutting screws need.
Together these decide the joint: the slot cuts, the thread holds, the pan head bears, and the stainless body lets the fixing sit in wash-down or coastal equipment without a plated layer to fail.
The head and the cutting slot are formed in one heading blow, and the thread is rolled afterwards. Rolling the thread over a slot that is already in place lets the roll lose its line at the slot edges, which is why the slot is deburred after rolling rather than before.
The slot itself is axial and single. A single slot is the simplest cutting form: one edge does the cutting, and the open side lets the chip escape along the screw rather than packing into the hole. Where a second or third notch is used, it is for a faster cut in thicker material, and the extra edges make the point weaker.
The thread runs the full length under the head, so there is no plain section to guide the screw. Guidance comes from the blunt end, which is flat and does not drill: the screw finds the pilot hole and cuts from the first turn, and it will not start a hole of its own.
Cleaning comes after the slot is deburred. The recorded part carries no coating and no oil film, which on stainless steel thread cutting screws is deliberate: a coating on the cutting edge blunts it, and an oil film on a part that will be handled in a clean room or a food area is unwelcome.
The alloy and its condition are on the drawing. A stainless screw that cuts into stainless sheet work-hardens both parts at the cut, so the grade and the temper are chosen together with the material being joined rather than on their own.
The family is quoted from M1 to M14, with M1, M2, M3, M4, M5, M6, M7, M8, M9, M10 and M14 in the recorded range. Custom lengths up to 2,000 mm are subject to DFM review after drawing submission; stainless steel thread cutting screws are usually short, because they cut into sheet or a thin section rather than clamping a deep stack.
| Item | How it is defined | What we control |
|---|---|---|
| Thread | Coarse single-lead thread, rolled, full length | Gauged per batch |
| Slot | One axial slot, opening onto the blunt end | Width, depth and edge condition checked |
| Tip | Blunt, no drill point | Checked on the projector |
| Pilot hole | Set by the thread and the sheet | Confirmed against a sample of the customer’s material |
| Head | Pan head with a Phillips recess | Diameter and height checked |
| Length | From under the head to the flat end | Measured on the shop plate |
| Alloy | Grade and condition per drawing | Confirmed on the material certificate |
The pilot hole is the number the customer owns, and on stainless it is less forgiving than on mild steel. Too small and the screw work-hardens the wall as it cuts, so the thread binds; too large and the cut thread has too little material around it to hold. The hole size belongs on the drawing with the material it is drilled in.
The slot depth is the shop’s side of the same problem. A slot that is too shallow does not reach the thread crest and cuts nothing; one that is too deep weakens the point. Both are checked on the magnified first article, and the first article is then driven in the customer’s material.
Cutting a thread in stainless is a different proposition from cutting one in mild steel, and the difference is worth stating plainly before a specification is fixed.
| Feature | What it gives | What it costs |
|---|---|---|
| Cutting slot | A formed thread with a chip taken out | Chips must clear; not for sealed cavities |
| Stainless body | No coating to fail; survives wash-down | Work-hardens; less forgiving of a wrong hole |
| Single axial slot | Simple, strong point | Slower cut than a multi-notch point |
| Full thread | Engagement over the whole length | No plain shank to guide against a bore |
| Uncoated finish | Cutting edge stays sharp; no oil film | No extra corrosion barrier beyond the alloy |
Stainless work-hardens at the cut. The first turn cuts cleanly, but if the screw binds or is turned back and forth, the wall gets harder and the next attempt is worse. That is why the pilot hole and the driving torque matter more here than on a plated steel equivalent, and why the first article is driven once, at the specified torque, rather than being tested repeatedly.
Galling is the other stainless-specific risk. A stainless screw cutting into stainless sheet can seize at the thread, and the joint then comes apart as a damaged hole and a torn thread. Where the joint is stainless to stainless, the drawing should say so, and a lubricant or a different alloy pairing is chosen rather than left to assembly.
The single slot is a deliberate simplification. It cuts slower than a multi-notch point, but it leaves a stronger point and a bigger chip channel, and on thin stainless sheet the cut is short enough that speed is not the limit. Where the material is thicker, a multi-notch version is the better part, and it is quoted as a different screw.
The recorded finish is plain, cleaned stainless with no plating, no passivation specified and no oil film. For a cutting screw that is a functional choice: anything added to the surface sits on the cutting edge and changes how it cuts.
| Option | What it does | Effect on slot and thread | Typical use |
|---|---|---|---|
| Plain, cleaned | No film; alloy protects | Cutting edge as formed | Food, cleanroom and general work |
| Passivated | Removes free iron from the surface | No dimensional change | Wet and hygienic service |
| Satin bead blast | Even matte face on the head | Softens the slot edges slightly | Visible panels |
| Dry film | Reduces galling against stainless | Film checked in the slot and recess | Stainless-to-stainless joints |
| Coated (steel variant) | Colour or extra protection | Edge blunted; re-checked by driving | Dry indoor work |
Passivation is worth having where the parts will sit wet, and it is not the same as plating: it removes embedded iron and leaves the dimensions alone, so the cutting edge is unaffected. That makes it the one treatment that can be added to a cutting screw without a re-validation of the drive.
A dry film is the exception where the material is the problem rather than the finish. On stainless steel thread cutting screws used in stainless sheet, a thin film on the thread reduces galling and lets the joint come apart again; the film is then checked in the slot and in the recess so that it has not filled either.
Three applications where the material has to survive as well as hold:
| Where it sits | The screw cuts its own thread into a stainless panel or bracket where the joint is washed down between runs and the fixing is seen. |
| When it goes wrong | A plated screw sheds its coating into a wash-down area, and a coated cutting edge does not cut cleanly in stainless sheet. |
| Why it happens | The equipment is stainless, it is cleaned daily, and the fixing has to stay bright. |
| What we control | Alloy grade and passivation agreed, slot and thread checked, and the first article driven in the customer’s sheet. |
| Where it sits | The screw fixes a bracket, a panel or a fitting to a stainless or aluminium structure where salt is present. |
| When it goes wrong | A zinc coated screw corrodes at the cut, and a stainless screw in contact with aluminium sets up a galvanic pair in the wet. |
| Why it happens | The joint is outdoors, it is wet, and it is meant to come apart again. |
| What we control | Grade confirmed, passivation recorded, and isolation between dissimilar metals agreed on the drawing. |
| Where it sits | The screw holds a panel, a guard or a fitting on equipment that sees chemicals and cleaning agents, where a coating would be attacked. |
| When it goes wrong | A plated part fails at a scratch, and a screw that binds in the hole work-hardens the sheet around it. |
| Why it happens | The environment is aggressive, the parts are small, and the finish has to be inert. |
| What we control | Alloy per the environment, no oil film, and the pilot hole verified on a sample. |
Four reasons that matter on a stainless cutting screw, each tied to what the drawing has to prove:
|
Alloy and pilot hole reviewed together
The alloy, the slot form and the pilot hole are reviewed against the sheet, so a screw that will bind and work-harden is raised before tooling. Basis: Alloy and pilot hole reviewed as one set. |
Head and slot in one blow
The pan head, the recess and the cutting slot are formed in one heading blow, the thread is rolled over the slot, and the slot is deburred afterwards. Basis: Head and slot formed in one blow. |
|
Slot and thread checked on the part
The slot is checked for depth and edge condition, the thread is gauged per batch, and the first article is driven in a sample of the sheet. Basis: First article driven in the sheet sample. |
First article to repeat production
The first article fixes the drawing revision, wire heat, die set, thread roll and slot form; repeat orders are compared against that record. Basis: First article signed off before the batch is released. |
Shi Shi Tong forms these stainless steel thread cutting screws on a single-die header that upsets the pan head, the Phillips recess and the axial cutting slot in one blow, then rolls the coarse thread over the full length under the head and deburrs the slot edges. The parts are cleaned and sorted. The first part of every run is measured on the head and the slot, and driven into a sample of the customer’s sheet, before the batch continues.
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The deburring after rolling is the step that decides whether the screw starts cleanly. Rolling pushes material into the slot edges, and a burr there will rub in the pilot hole instead of cutting, which in stainless work-hardens the wall and makes the joint harder to close with every turn. That is why the edge is dressed after rolling and checked under a light.
What decides whether stainless steel thread cutting screws pass is the slot, the tip, the thread, the head and the surface. The inspection agreement covers those, and the criteria come from the drawing.
Slot and tip on the projector |
Thread gauged per batch |
Hardness testing of the wire |
Salt-spray testing where the service requires it |
The slot is checked open and under magnification. A slot that is present but does not reach the crest cuts nothing, and the screw then behaves as a blunt self-tapping screw with no cutting action; that failure looks correct from the side and wrong from the end.
The drive test is done once per first article, in the customer’s sheet, at the specified torque. Repeating it on the same hole is not allowed in the record, because the second attempt is a different test: the first one work-hardened the wall. The result is recorded with the sheet sample and the hole size, so a repeat order is checked against the same conditions.
Every shipment of stainless steel thread cutting screws is traceable to the wire it was made from. 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 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. On a stainless cutting screw the first article is driven once in the customer’s sheet and the result recorded with the hole size, because the same test cannot be repeated on the same hole. Buyers visit during the process to review samples and to see how the slots are formed.
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8,678+
customers served
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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 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 |
A screw whose point carries a cutting slot or notch, so it cuts its own thread in a prepared pilot hole instead of displacing the material.
A single axial slot leaves a stronger point and a larger chip channel. Multiple notches cut faster in thicker material but weaken the point.
Stainless work-hardens at the cut and can gall against stainless sheet. The pilot hole and the driving torque are less forgiving than on mild steel.
No. The end is blunt, so it needs a drilled pilot hole. A screw that drills its own hole is a different part with a different point.
Plain, cleaned stainless with no coating and no oil film, so the cutting edge stays as formed. Passivation can be added where the parts sit wet.
Thread size and pitch, head diameter and height, slot form, length and datum, pilot hole, stainless grade and condition, and the sheet material being joined.
How a stainless steel thread cutting screw project runs from drawing to repeat delivery:
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1
Send the drawing and a sheet sample
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→ |
2
Slot and pilot hole review
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→ |
3
First article driven once in the sheet
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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 thread size and pitch, head diameter and height, slot form, length and datum, the pilot hole, the stainless grade and condition, and the sheet being joined.
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Thread and pitch
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Head and recess
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Slot form
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Length and datum
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Pilot hole
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Grade and sheet
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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
