🔘 M2–M6 Brass Knurled Thumb Screws – Nickel Plated Hand Grip Knob Bolts for Tool‑Less Fastening
You’re working on a vintage radio, a marine instrument, or a piece of decorative hardware – and you want a thumbscrew that feels warm to the touch, won’t rust, and looks elegant. These knurled thumb screws are machined from solid brass with a bright nickel plating. The diamond knurled head gives you a secure, non‑slip grip for hand tightening – no tools required. Available in metric sizes M2, M3, M4, M5, and M6, with a range of thread lengths (select from dropdown). Fully threaded for maximum holding power. Perfect for electrical terminals, camera brackets, musical instruments, and any application where a classic, corrosion‑resistant hand knob is needed.
✨ Key Features – Brass Nickel Plated Knurled Thumb Screws
- 🔘 Knurled round head – Fine diamond knurling provides excellent fingertip grip – easy to turn by hand, no tools required.
- 🛡️ Solid brass with nickel plating – Corrosion‑resistant, non‑magnetic, and electrically conductive. The nickel plating adds a bright, tarnish‑resistant finish.
- ⚙️ Fully threaded metric sizes M2, M3, M4, M5, M6 – Covers miniature electronics up to light machinery and marine hardware.
- 📏 Thread length measured under head – Select your required stud length from the dropdown (typical range 4–40mm). Fully threaded for maximum grip.
- 🎨 Classic brass appearance under nickel – The nickel plating gives a silver finish that resists tarnishing, while the brass core provides strength.
- 🔧 Widely used – Electronics terminals, camera rigs, instrument adjustment screws, marine equipment, and decorative hardware.
📏 Specifications – Brass Knurled Thumb Screws (Nickel Plated)
| Thread Diameter (M) |
Thread Pitch (mm) |
Head Style |
Head Diameter (approx.) |
Head Height (approx.) |
Material / Finish |
Thread Length (mm, under head) * |
| 📐 Length measured from underside of head to tip. Fully threaded. Select exact size and length from dropdown. |
| M2 |
0.4 |
Round knurled |
~5‑6 mm |
~3‑4 mm |
Brass / Nickel plated |
4, 5, 6, 8, 10, 12, 16, 20, 25, 30, 35, 40
(exact availability varies) |
| M3 |
0.5 |
~6‑8 mm |
~4‑5 mm |
| M4 |
0.7 |
~8‑10 mm |
~5‑6 mm |
| M5 |
0.8 |
~10‑12 mm |
~6‑7 mm |
| M6 |
1.0 |
~12‑14 mm |
~7‑8 mm |
* Thread lengths are typical – exact availability may vary. Please allow minor dimensional tolerances. Contact us for custom lengths or finishes.
📋 Why Choose Brass Thumb Screws?
| Property |
Benefit |
| Corrosion resistance |
Brass resists rust and tarnish, especially with nickel plating. Ideal for marine, humid, or outdoor applications. |
| Non‑magnetic & conductive |
Safe for sensitive electronics and ideal for grounding or electrical connections. |
| Attractive finish |
Nickel plated brass has a bright, silver appearance that matches many devices and won’t tarnish like raw brass. |
| Tool‑less operation |
Knurled head allows hand tightening – no screwdrivers or wrenches needed. Perfect for frequent adjustments. |
❓ Frequently Asked Questions – Brass Knurled Thumb Screws
1. How do I measure the length of a thumb screw?
The length is measured from the underside of the head (where the knurling meets the shaft) to the tip of the threaded stud. The head itself is NOT included. For example, an “M4 x 10mm” screw has a 10mm long threaded shaft under the head. All our lengths follow this standard.
2. Are these screws fully threaded? What about longer lengths?
Yes – all M2 to M6 brass thumb screws are fully threaded from under the head to the tip, giving you maximum grip in tapped holes or when using a nut.
3. Will the nickel plating wear off? Can I use these outdoors?
Nickel plating is durable and provides good corrosion resistance for indoor and light outdoor use. The underlying brass is also corrosion‑resistant. For continuous saltwater exposure, we recommend stainless steel, but for most applications, brass with nickel plating is excellent.
4. Do I need a nut or washer with these thumb screws?
If your equipment has a pre‑tapped metric hole (e.g., M4 threaded insert), no nut is needed. For plain holes, use a standard brass or steel metric nut of the same thread size. A flat washer is optional for load distribution.
5. Are brass thumb screws strong enough for structural use?
Brass has lower tensile strength than steel. These thumb screws are designed for light to medium duty fastening – electronics enclosures, camera accessories, instrument adjustments. For heavy load‑bearing, use steel thumb screws.
6. Can I get other lengths or custom finishes?
Yes – we offer custom lengths and can also supply unplated brass (self‑colour) on request. Please contact us with your requirements.
