M1.6–M4 Six-Lobe Torx Pan Head Screw — GB2672 Grade 8.8 Black Carbon Steel

Six-lobe Torx (T-drive) pan head screws in the M1.6 to M4 size range, manufactured to GB2672 standard in grade 8.8 black carbon steel. The six-lobe drive geometry delivers significantly higher torque transfer than Phillips or slotted drives at the same screw size — eliminating cam-out, reducing driver wear, and enabling reliable fastening in tight spaces where a Phillips driver would slip and strip. The black oxide finish provides corrosion resistance and a clean, professional appearance in visible assemblies.

Why Six-Lobe (Torx) Over Phillips?

Property	Six-Lobe Torx	Phillips
Cam-out resistance	Excellent — zero cam-out by design	Poor — designed to cam-out
Torque transfer	Very high — 6 contact lobes	Moderate — 4 contact points
Driver wear	Minimal	High (especially at small sizes)
Tamper resistance	Moderate (requires Torx bit)	Low (universal driver)
Ideal for	Electronics, precision assemblies, high-torque applications	General woodworking, construction

Specifications

Standard	GB2672
Material	Grade 8.8 Carbon Steel
Surface Finish	Black oxide (black)
Drive Style	Six-Lobe (Torx / T-drive)
Head Style	Pan (round button) head
Thread Type	Metric machine thread
Quantity	10PCS per pack (5PCS for M4)

Size & Thread Pitch Reference

Size	Diameter	Thread Pitch	Available Lengths
M1.6	1.6mm	0.35mm	3 / 4 / 5 / 6 / 8 / 10 / 12mm
M2	2.0mm	0.40mm	3 / 4 / 5 / 6 / 8 / 10 / 12mm
M2.5	2.5mm	0.45mm	3 / 4 / 5 / 6 / 8 / 10 / 12mm
M4	4.0mm	0.70mm	3 / 4 / 5 / 6 / 12mm

Key Features

✅ Zero cam-out — six-lobe geometry keeps the driver engaged under high torque, preventing head stripping
✅ Grade 8.8 strength — high tensile strength for reliable clamping in metal and hard plastic assemblies
✅ Black oxide finish — corrosion resistance + clean black aesthetic for visible electronics builds
✅ GB2672 standard — consistent dimensional tolerances for reliable fit in tapped holes
✅ M1.6–M4 range — covers the most common sizes for electronics enclosures, PCB mounting, and precision assemblies
✅ Pan head profile — wide bearing surface distributes clamping load, ideal for thin panels and PCBs

Common Applications

Electronics enclosure and project box assembly
PCB mounting and standoff fastening
3D printer frame and component assembly
Laptop, tablet, and consumer electronics repair
Drone and RC vehicle frame assembly
Optical instrument and camera equipment fastening
Precision mechanical assembly requiring high torque without cam-out
Automotive interior trim and electronics bracket mounting

Torx Bit Size Reference

Screw Size	Torx Bit
M1.6	T5 or T6
M2	T6 or T7
M2.5	T8
M4	T20

Frequently Asked Questions

Q: Are these machine screws or self-tapping?
A: These are machine screws with metric thread. They require a pre-tapped hole or a threaded insert (e.g., brass heat-set nut) to fasten into. They are not self-tapping.

Q: What Torx bit do I need?
A: See the Torx Bit Size Reference table above. T6 covers M1.6–M2, T8 covers M2.5, and T20 covers M4.

Q: Can I use these in aluminium?
A: Yes. Grade 8.8 carbon steel screws are commonly used in aluminium tapped holes. Apply a small amount of anti-seize compound to prevent galvanic corrosion in long-term installations.