🖧 M3.5 Aluminum Alloy Knurled Thumb Screws – Hand Grip Knob Bolts for PC Cases & DIY
If you’re tired of reaching for a screwdriver every time you open your computer case or adjust a model, these M3.5 knurled thumb screws are the answer. Made from lightweight aluminum alloy with an anodized finish, they feature a deeply knurled head that gives you a secure, non‑slip grip – just turn by hand. The M3.5 thread (0.6mm pitch) is a common size for many PC cases, server racks, and electronic enclosures. Available in thread lengths from 4.5mm up to 25mm, and in multiple anodized colors, they’re perfect for computer chassis, side panels, hard drive cages, aviation models, toy models, and even bicycle accessories. No tools, no hassle – just grab and turn.
✨ Why These M3.5 Knurled Thumb Screws Are a Smart Choice
Tool‑free hand operation – The knurled aluminum head gives you excellent fingertip grip. Tighten or loosen by hand in seconds – perfect for frequent access panels.
M3.5 metric thread (0.6mm pitch) – A standard size for many PC cases, rackmount gear, and electronics. Not as common as M3, but used in specific applications where a slightly larger thread is needed.
Thread lengths from 4.5mm to 25mm – Choose exactly what you need for thin side panels or thicker mounting blocks. Length is measured under the head (thread only).
Lightweight aluminum alloy with anodized finish – Anti‑static, corrosion‑resistant, and the anodized coating won’t fade or peel like paint.
Multi‑color options – Available in various anodized colors to match your build or color‑code different screws.
Wide range of uses – Computer hosts, chassis accessories, aviation models, toy models, bicycle accessories, and other DIY projects.
📏 Technical Specifications – M3.5 Knurled Thumb Screws
| Type |
Knurled Thumb Screws / Hand Grip Knob Bolts |
| Material |
Aluminum alloy (anodized) |
| Thread Size |
M3.5 (metric, 3.5mm diameter) |
| Thread Pitch |
0.6mm |
| Thread Length Range (under head) |
4.5mm to 25mm (specific lengths available: e.g., 4.5, 6, 8, 10, 12, 15, 20, 25mm – check dropdown or contact us) |
| Head Style |
Round knurled head for hand grip |
| Surface Treatment |
Anodic oxidation (anodized) – durable color finish |
| Available Colors |
Multi‑color – specific options vary (contact us for current stock) |
| System of Measurement |
Metric |
| Applications |
PC cases, server chassis, aviation models, toy models, bicycle accessories, electronic enclosures, DIY modding |
📐 Size format: M3.5 × thread length (e.g., M3.5×10 = 3.5mm diameter, 10mm long shaft under the head).
❔ Frequently Asked Questions
Will M3.5 screws fit my PC case?
M3.5 is less common than M3 or 6#32 in standard consumer PC cases, but it is used in some server chassis, industrial computers, and certain older or specialized cases. The best way to know is to remove one of your original screws and measure the diameter with calipers: if it reads about 3.5mm, then M3.5 is correct. You can also try threading it into a known M3.5 nut. If you’re unsure, contact us with a photo of your original screw.
What thread length should I choose?
Measure the thickness of the material you’re clamping (side panel, bracket, etc.). Add 2‑3mm to ensure the screw fully engages the threaded hole or nut. For example, a 2mm thick panel → choose 5mm or 6mm length. We offer lengths from 4.5mm to 25mm – if you need a specific size not listed, please contact us.
Are these screws fully aluminum? Will they strip easily?
Yes, the entire screw (head and thread) is aluminum alloy. Aluminum is lighter and softer than steel, so hand tightening only is recommended. For PC case panels and light electronics, they are perfectly strong. Do not use pliers or power tools – excessive torque can strip the threads. If you need high clamping force, choose stainless steel thumb screws instead.
Will the anodized color fade or wear off?
Anodizing is an electrochemical process that bonds the color into the aluminum surface – it’s much more durable than paint. Under normal hand use and indoor conditions, the color will not fade, peel, or scratch easily. However, heavy abrasion or contact with sharp metal edges could mark the finish.
Can I use these screws for other projects besides computers?
Absolutely. These M3.5 thumb screws are great for aviation models, RC toys, bicycle accessories (e.g., fender mounts, bottle cage bolts if the thread matches), camera rigs, musical instruments, and any DIY project that needs a medium‑sized metric hand screw.
Do you offer other lengths or colors not listed?
Yes, we carry a wide range of M3.5 thumb screw lengths (up to 30mm or more) and many anodized colors. If you don’t see your desired length or color in the dropdown, please contact our customer service – we can usually accommodate custom requests.
