🔩 Product Overview: PM1.2–M5 Torx Pan Head Machine Screws – Carbon / Stainless Steel (Plum Round Head Bolts)
For precision fastening where cam‑out and stripping are not an option, these Torx pan head machine screws deliver superior torque transfer and a secure, slip‑free drive. The six‑lobe star recess (Torx) provides full contact engagement, allowing you to tighten with confidence even in small sizes. Available in micro diameters from PM1.2 (M1.2) up to M5, with lengths from 2.5mm to 16mm (measured under the head). Choose from carbon steel (with various platings) or 304 stainless steel for natural corrosion resistance. The low‑profile pan head (plum round head) distributes clamping force evenly and gives a clean finish. Ideal for automotive, electronics, medical devices, furniture, and general industrial assembly.
✨ Why These Torx Pan Head Micro Screws Are a Precision Essential
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Torx (star) drive – Six‑lobe internal recess provides full contact engagement, eliminates cam‑out, and allows higher torque without stripping – even in micro sizes.
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Choice of materials – carbon steel or 304 stainless steel – Carbon steel with plating offers strength and corrosion resistance. 304 stainless provides natural rust protection for harsh environments.
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Plum round head (pan head) – Low‑profile rounded head with a flat bearing surface. Provides even clamping force and a clean, professional finish.
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Micro to small metric range: PM1.2 (M1.2), PM1.4, PM1.6, up to M5 – Covers the smallest diameters for watches, electronics, medical instruments, and precision assemblies.
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Lengths from 2.5mm to 16mm (under head) – Extremely short screws for thin panels, longer ones for through‑hole applications. Choose exactly what your project needs.
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Fully threaded, coarse metric pitch – Standard threads run the entire shank length for maximum grip.
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Multiple finish options – Nickel‑plated, black zinc, white zinc, blue white zinc, 304 stainless natural, 304 stainless black, plus anti‑loosening rubber coated versions.
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Wide application range – Automotive manufacturing, machinery, electronic equipment (computer chassis, appliance housings), construction (steel structures, curtain walls), medical devices, toys, furniture, eyebolt screws, and positioning pins.
📏 Technical Specifications – Torx Pan Head Screws (PM1.2–M5)
| Specification |
PM1.2 (M1.2) |
PM1.4 (M1.4) |
PM1.6 (M1.6) |
M2 |
M2.5 |
M3 |
M4 |
M5 |
| Thread Diameter (d) |
1.2mm |
1.4mm |
1.6mm |
2mm |
2.5mm |
3mm |
4mm |
5mm |
| Thread Pitch (p) |
0.25mm |
0.3mm |
0.35mm |
0.4mm |
0.45mm |
0.5mm |
0.7mm |
0.8mm |
| Head Diameter (dk) range |
2.5–3.0mm |
3.0–3.5mm |
3.5–4.0mm |
4.0–4.5mm |
4.5–5.5mm |
5.5–7.0mm |
7.0–8.5mm |
8.5–10mm |
| Head Thickness (k) range |
0.6–0.8mm |
0.7–1.0mm |
0.8–1.2mm |
1.0–1.5mm |
1.2–1.8mm |
1.5–2.2mm |
2.0–2.8mm |
2.8–3.4mm |
| Length Range (under head) |
2.5mm – 16mm (select from options) |
| Torx Bit Size (approx.) |
T3 |
T4 |
T5 |
T6 |
T8 |
T10 |
T20 |
T25 |
🎨 Available Finishes (Select from Options)
| Finish |
Material Base |
Description |
| Nickel‑Plated |
Carbon Steel |
Bright silver, good corrosion resistance |
| Black Zinc |
Carbon Steel |
Dark matte finish – blends with black equipment |
| White Zinc |
Carbon Steel |
Bright silver with slight bluish tint |
| Blue White Zinc |
Carbon Steel |
Bright blue‑silver, high corrosion resistance |
| 304 Stainless Natural |
304 Stainless |
Unplated, silver, excellent rust resistance |
| 304 Stainless + Black |
304 Stainless |
Black coated stainless – extra style and protection |
| Nickel + Anti‑Loosening Rubber |
Carbon Steel Pre‑applied patch for vibration resistance |
| Black Zinc + Anti‑Loosening Rubber |
Carbon Stee Dark finish with vibration‑resistant patch |
❓ FAQs – Torx Pan Head Micro Screws
🔸 What are the advantages of Torx drive over Phillips or hex?
Torx (star) drive has vertical sidewalls that prevent cam‑out – the driver does not push out of the recess under torque. This allows higher tightening forces without stripping, reduces fastener damage, and makes them ideal for power tool assembly. For micro sizes like M1.2–M2, Torx is especially reliable compared to Phillips.
🔸 Are these screws fully threaded? How is length measured?
Yes – they are fully threaded from just under the head to the tip. Length is measured from the underside of the head (the flat bearing surface) to the tip, not including the pan head. For example, an M3 x 10mm screw has a 10mm threaded shank.
🔸 Which finish should I choose for my application?
Nickel‑plated, white zinc, and blue white zinc offer bright silver finishes for general use. Black zinc is best for dark assemblies. 304 stainless natural provides superior corrosion resistance for medical, marine, or outdoor applications. Anti‑loosening rubber coated versions are ideal for high‑vibration environments.
🔸 What Torx bit size do I need for PM1.2 through M5?
PM1.2 uses T3, PM1.4 uses T4, PM1.6 uses T5, M2 uses T6, M2.5 uses T8, M3 uses T10, M4 uses T20, M5 uses T25. A good quality precision Torx bit set (T3–T25) is recommended.
🔸 Can I use these screws with nuts, or are they self‑tapping?
These are standard machine screws – they require a matching metric nut (M1.2–M5) or a pre‑tapped hole. They are not self‑tapping. For best results, pair with steel or stainless nuts of the same thread size.
🔸 What is the anti‑loosening rubber coating?
The anti‑loosening rubber (pre‑applied patch) is a coating on the threads that adds friction, preventing the screw from vibrating loose. It is ideal for applications with movement or vibration, such as automotive, machinery, or electronics with cooling fans.
