🔩 M2.5 Adjustable Knurled Thumb Shoulder Screws – 6061 Aluminium Knob + 304 Stainless Steel, 10 Anodised Colours (3–40mm Thread Lengths)
You’re building a custom PC, adjusting a camera tripod, or assembling a precision machine bracket – and you need a thumbscrew that not only looks great but also acts as a pivot or spacer. These M2.5 shoulder thumb screws combine a wide, knurled aluminium head (8mm diameter) with a 304 stainless steel threaded stud that includes a precision shoulder section. The shoulder acts as a bearing surface or a stop, making these ideal for quick‑release mechanisms, adjustable brackets, and moving parts. Available in 10 anodised colours – from burgundy red to emerald, sky blue to dark purple. Thread lengths from 3mm to 40mm. Fully threaded shoulder portion with a smooth 5mm diameter shank. Perfect for computer case modding, camera rigs, machine racks, RC models, and any application where a tool‑less, colourful, and precise fastener is required.
✨ Key Features – M2.5 Anodised Aluminium Shoulder Thumb Screws
- 🎨 10 vibrant anodised colours – Burgundy red, rosy red, golden yellow, jewel blue, sky blue, black, silver, emerald, dark purple, brownish orange. Match your build or add a personal accent.
- 🔘 Large 8mm knurled head – Wide diamond knurling provides excellent fingertip grip – no tools needed.
- ⚙️ Shoulder design (5mm diameter x 4mm height) – The precision shoulder acts as a bearing surface, spacer, or pivot point for moving assemblies.
- 🛡️ 304 stainless steel threaded stud – Corrosion‑resistant, strong, and fully threaded (M2.5 x 0.45mm pitch) with a smooth shoulder transition.
- ⚖️ Lightweight 6061 aluminium head – Anodised finish resists scratches and corrosion, while keeping overall weight low.
- 📏 Thread lengths 3–40mm (under head, including shoulder) – The threaded portion plus the shoulder gives you precise spacing options. Select from dropdown.
- 🛠️ Versatile applications – PC computer case modding, camera tripod quick‑release plates, machine rack brackets, RC model hinges, and DIY projects requiring tool‑less adjustment.
📏 Specifications – M2.5 Shoulder Thumb Screws (Aluminium + 304 Stainless)
| Thread Size (M) |
Thread Pitch (mm) |
Head Diameter (mm) |
Head Height (mm) |
Shoulder Diameter (mm) |
Shoulder Height (mm) |
Thread Length Range (mm) * |
Head Material / Finish |
Thread Material |
Available Colours (10) |
| M2.5 |
0.45 |
8 |
4 |
5 |
4 |
3, 4, 5, 6, 8, 10, 12, 15, 18, 20, 25, 30, 35, 40 |
6061 aluminium / anodised |
304 stainless steel (A2) |
Burgundy red, rosy red, golden yellow, jewel blue, sky blue, black, silver, emerald, dark purple, brownish orange |
* Thread length measured from underside of head to tip, including the 4mm shoulder. Fully threaded metric coarse (M2.5 x 0.45). Select colour and length from dropdown.
🎯 Where & How to Use Shoulder Thumb Screws
| Application |
Typical Use |
Colour Match Suggestion |
| PC case modding |
Side panel thumbscrews, radiator brackets, drive bay fasteners |
Jewel blue, black, silver, red |
| Camera rigs / tripods |
Quick‑release plate locks, bracket clamps, extension arms |
Black, silver, red, sky blue |
| Machine racks & brackets |
Adjustable stops, pivot points, tool‑less clamps |
Silver, black, dark purple |
| RC models & toys |
Hinge pins, body mounts, quick‑release battery covers |
Golden yellow, emerald, orange, sky blue |
❓ Frequently Asked Questions – Shoulder Thumb Screws
1. How do I measure the length of a shoulder thumb screw?
The length includes both the threaded portion and the smooth shoulder from the underside of the head to the tip. For example, an “M2.5 x 10mm” screw has a total stud length of 10mm (shoulder + thread). The head is NOT included. The shoulder is 4mm high, so a 10mm screw has a 6mm threaded section plus the 4mm shoulder.
2. What is the purpose of the shoulder on these thumb screws?
The smooth 5mm diameter shoulder acts as a bearing surface, a pivot, or a spacer. It allows the screw to pass freely through a hole while the threaded part engages a nut or tapped hole. This is perfect for hinges, adjustable brackets, and quick‑release mechanisms where a precise fit is needed.
3. Are the threaded studs fully threaded? How long is the threaded portion?
The threaded portion runs from the end of the shoulder to the tip. The total stud length minus the 4mm shoulder equals the thread length. For example, a 10mm screw has 6mm of thread; a 20mm screw has 16mm of thread. The shoulder is always 4mm and 5mm diameter.
4. Will the anodised aluminium head scratch or fade?
Anodising is a durable electrochemical finish that bonds to the aluminium. It resists scratches and fading far better than paint. Normal handling will not remove the colour.
5. Can I use these screws outdoors? Will the stainless steel rust?
304 stainless steel (A2) offers good corrosion resistance for indoor and light outdoor use. The anodised aluminium head is also corrosion‑resistant. For continuous saltwater or harsh chemical environments, consider 316 stainless. For PC cases, cameras, and workshop equipment, these are perfectly fine.
6. Do I need a nut or washer? What size nut fits?
If your equipment has a pre‑tapped M2.5 hole, no nut is needed. For plain holes, use a standard M2.5 metric nut (0.45mm pitch). The shoulder diameter (5mm) is larger than the thread, so it will not pass through a 2.5mm hole – it acts as a stop.
