The Torx pin security screw is a tamper-resistant fastener that adds a center pin to a six-lobe internal drive, preventing engagement by an ordinary solid Torx-style bit. Installation and removal require a matching security bit with a center hole. “Torx Pin” describes the drive rather than one complete screw standard, so these fasteners are supplied with pan, button, countersunk, machine-thread, self-tapping, and self-drilling configurations. Typical buyers include OEMs, enclosure manufacturers, public-equipment suppliers, and maintenance teams that need reusable restricted-access fastening.
Product Overview and Key Features
The six-lobe recess and center pin increase resistance to casual removal while retaining a reversible drive for authorized service. The technically appropriate description is tamper resistant rather than universally tamper proof.
- Pin-in-six-lobe drive: blocks ordinary solid drivers and requires a matching hollow-center security bit.
- Reusable security: suitable for assemblies that must be opened again by authorized technicians.
- Multiple head styles: pan, button, countersunk, and other project-specific heads are common market configurations.
- Multiple thread systems: machine, self-tapping, and self-drilling forms are common market options.
- Tool control: access can be managed through the matching security driver.
Torx Pin Security Screw Specifications
Specification Overview
| Item | Specification / Market Configuration |
|---|---|
| Product family | Pin-in-hexalobular tamper-resistant security screw |
| Drive | Six-lobe recess with center pin; matching hollow-center security bit required |
| Drive reference | ISO 10664 defines the standard hexalobular internal drive geometry; the added security pin is not fully defined by ISO 10664 alone |
| Common head styles | Pan, button, countersunk / flat, raised countersunk, and custom heads |
| Common thread forms | Metric coarse machine thread, UNC machine thread, self-tapping, and self-drilling |
| Common metric sizes | M3, M4, M5, M6, M8, M10; smaller and larger market sizes also exist |
| Common materials | A2 stainless steel, A4 stainless steel, carbon or alloy steel |
| Common finishes | Natural/passivated stainless, zinc-plated steel, black finishes, or project-specified coatings |
Dimensions and Thread Details
Head dimensions depend on the selected head style, so one table cannot represent every Torx Pin screw. The table below is a verified market reference for a metric button-head machine-screw configuration. dk is head diameter and k is head height. Length examples are catalog combinations, not Flybear inventory.
| Thread | Pitch (mm) | dk (mm) | k (mm) | Security Tool | Example Lengths (mm) |
|---|---|---|---|---|---|
| M3 | 0.5 | 5.7 | 1.65 | TX10 | 8, 12, 16, 20, 25, 30 |
| M4 | 0.7 | 7.6 | 2.2 | TX20 | 8, 12, 16, 20, 25, 30 |
| M5 | 0.8 | 9.5 | 2.75 | TX25 | 8, 12, 16, 20, 25, 30 |
| M6 | 1.0 | 10.5 | 3.3 | TX30 | 8, 12, 16, 20, 25, 30 |
| M8 | 1.25 | 14.0 | 4.4 | TX40 | 12, 16, 20, 25, 30, 40 |
| M10 | 1.5 | 17.5 | 5.5 | TX45 | 12, 16, 20, 25, 30, 40 |
For pan or countersunk heads, use dimensions for that specific form rather than this button-head table. ISO 14583 covers ordinary hexalobular pan head screws from M2 to M10; the added security pin should be confirmed by supplier specification or drawing.
Common Materials, Grades and Surface Finishes
Material and Grade Options
A2 and A4 stainless steels are common where corrosion resistance is important. Carbon or alloy steel is also used where mechanical requirements or cost favor steel. Required strength or hardness must be stated separately because the security drive does not establish a property class.
Coating and Finish Options
Stainless versions commonly use a natural or passivated surface. Carbon-steel security screws are often zinc plated, while black or project-specific finishes may also be selected. Coating buildup inside the recess can affect driver engagement, so recess and pin fit should be checked after finishing. Confirm the material, finish, head, thread, and size combination during quotation.
Typical Applications and Selection Considerations
- Electrical cabinets, control panels, access covers, and communication equipment.
- Public fixtures, displays, kiosks, vending equipment, and transport interiors.
- Machinery guards, service panels, electronics housings, and OEM equipment.
- Assemblies where authorized maintenance is required but ordinary-tool removal should be discouraged.
Flybear’s security screw types guide compares pin-in-hexalobular and other security drives. For tooling, see the screw drive selection guide. Match head style, thread engagement, material, coating, installation torque, service frequency, and driver-bit control to the application.
Ordering and Quality Documentation
An RFQ should define the security drive, head style, thread and pitch, length, material, finish, quantity, mating component, and required bit size. Inspection may cover thread gauging, head dimensions, recess geometry, center-pin position, material verification, coating, and driver engagement. Flybear’s quality control and inspection page provides related inspection information; exact tests and documents should be agreed for the order.
Frequently Asked Questions
Is a Torx Pin screw the same as a standard Torx screw?
No. A standard six-lobe screw has an open center, while the security version adds a center pin that blocks a normal solid bit. A matching hollow-center security bit is required for installation and removal.
Is there one ISO standard for all Torx Pin security screws?
No single ISO product standard defines every head, thread, and center-pin security configuration. ISO 10664 covers the standard hexalobular internal driving feature, while product standards such as ISO 14583 define particular screw forms. The security pin and finished fastener should therefore be specified by the applicable drawing or supplier specification.
Which head style should I choose?
Pan and button heads suit general covers and panels where a projecting head is acceptable. Countersunk heads provide a flush surface when the mating part has the correct countersink. Select the head by clearance, bearing area, appearance, accessibility, and required resistance to external gripping.
Are stainless steel Torx Pin screws available?
A2 and A4 stainless steel are common market options for pin-in-six-lobe security screws. Material should be chosen for the operating environment and mechanical requirements rather than for security alone. For chloride-rich or more aggressive exposure, A4 may be considered where appropriate.
What information is needed for an RFQ?
Provide head style, security drive, thread, pitch, length, material, finish, quantity, application, and matching bit requirement. A drawing is recommended when recess geometry, center-pin dimensions, special head proportions, or inspection tolerances are customer controlled.
Request a Quote for Torx Pin Security Screws
Send Flybear Industrial your Torx Pin security screw head style, thread, length, material, finish, quantity, application, and security-tool requirements. Include a drawing when the center pin, recess, or head geometry is project controlled. Submit the details through the Flybear fastener RFQ page for technical review and quotation.
