Keszoox
304 A2-70 Stainless Steel Torx Six-Lobe Pin Security Self-Tapping Screw M2.9–M4.8 | Tamper-Resistant | Pan Head
304 A2-70 Stainless Steel Torx Six-Lobe Pin Security Self-Tapping Screw M2.9–M4.8 | Tamper-Resistant | Pan Head
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304 A2-70 Stainless Steel Torx Six-Lobe Pin Security Self-Tapping Screw — M2.9–M4.8 | Tamper-Resistant
Tamper-resistant Torx six-lobe (T*) pin security self-tapping screws in 304 A2-70 stainless steel — combining the corrosion resistance of marine-grade stainless steel with the tamper-resistance of the pin-in-Torx drive system. The centre pin in the Torx socket prevents standard Torx drivers from engaging, requiring a specialist pin-in-Torx (T* or TR) bit for installation and removal. This makes these screws ideal for outdoor equipment, public installations, and any application where unauthorised access or vandalism is a concern. The self-tapping thread cuts into wood, plastic, and thin sheet metal without pre-tapping. Available in M2.9, M3.5, M3.9, M4.2, and M4.8 diameters with lengths from 8mm to 60mm.
Specifications
| Material | 304 Stainless Steel (A2-70) |
| Drive Style | Torx Six-Lobe with Centre Pin (T* / TR — tamper-resistant) |
| Head Style | Pan (round) head |
| Screw Type | Self-tapping (thread-forming) |
| Size Range | M2.9 / M3.5 / M3.9 / M4.2 / M4.8 |
| Length Range | 8mm – 60mm |
| Pack Quantity | Under 50PCS |
| Origin | Mainland China |
304 A2-70 Stainless Steel — Corrosion Resistance
| Material | Corrosion Resistance | Suitable Environment |
|---|---|---|
| Carbon steel (zinc plated) | Low — zinc coating sacrificial | Indoor, dry environments only |
| Carbon steel (black oxide) | Very low — cosmetic only | Indoor, dry environments only |
| 304 SS A2-70 (this product) | High — passive oxide layer | Outdoor, marine, food, chemical |
| 316 SS A4-70 | Very high — molybdenum addition | Marine, chloride, acid environments |
Torx Pin Security Drive — Tamper Resistance
The six-lobe Torx drive provides higher torque transfer than Phillips or slotted drives, reducing cam-out and driver damage. The addition of a centre pin in the socket:
- Prevents standard Torx drivers from engaging — the pin blocks the standard Torx bit
- Requires a pin-in-Torx (T* or TR) bit — a specialist bit with a hole in the centre to accommodate the pin
- Deters casual tampering — standard tool kits do not include pin-in-Torx bits
- Does not prevent authorised access — pin-in-Torx bits are readily available to maintenance personnel
Key Features
- ✅ 304 A2-70 stainless steel — excellent corrosion resistance for outdoor, marine, and food-contact applications
- ✅ Pin-in-Torx tamper-resistant drive — prevents removal with standard tools, deters vandalism and unauthorised access
- ✅ Self-tapping thread — cuts its own thread in wood, plastic, and thin sheet metal
- ✅ Pan head — low-profile domed head for surface-mount applications
- ✅ M2.9–M4.8 range — covers light electronics through medium-duty outdoor fastening
- ✅ 8–60mm lengths — wide range for different material thicknesses
Common Applications
- Outdoor electrical enclosure and junction box fastening
- Public signage and display fastening
- Playground and outdoor furniture assembly
- Marine and boat deck hardware
- Security camera and CCTV enclosure fastening
- Vending machine and kiosk panel fastening
- EV charging station enclosure fastening
- Food processing equipment fastening (stainless steel required)
Required Driver Bit
These screws require a pin-in-Torx (T* or TR) security bit for installation and removal. Common sizes for M2.9–M4.8 screws are T10*, T15*, T20*, and T25*. Standard Torx bits (without the centre hole) will not engage these screws.
Frequently Asked Questions
Q: Can I remove these screws with a standard Torx driver?
A: No. The centre pin prevents standard Torx drivers from seating in the socket. You need a pin-in-Torx (T* or TR) security bit with a centre hole to accommodate the pin.
Q: Are these suitable for saltwater marine environments?
A: 304 stainless steel provides good corrosion resistance in marine environments but can pit in prolonged saltwater exposure. For continuous saltwater immersion, use 316 stainless steel (A4-70) instead.
Package Contents
- Pack of 304 A2-70 Stainless Steel Torx Pin Security Self-Tapping Screws (size and length as selected)
