Plastic Round 12 Knurled Thumb Screws – Black, M3 M4 M5 M6, Zinc‑Plated Steel (Hand Knob Bolts) - HomeDIYer
Plastic Round 12 Knurled Thumb Screws – Black, M3 M4 M5 M6, Zinc‑Plated Steel (Hand Knob Bolts) - HomeDIYer
Plastic Round 12 Knurled Thumb Screws – Black, M3 M4 M5 M6, Zinc‑Plated Steel (Hand Knob Bolts) - HomeDIYer
Plastic Round 12 Knurled Thumb Screws – Black, M3 M4 M5 M6, Zinc‑Plated Steel (Hand Knob Bolts) - HomeDIYer
Plastic Round 12 Knurled Thumb Screws – Black, M3 M4 M5 M6, Zinc‑Plated Steel (Hand Knob Bolts) - HomeDIYer
Plastic Round 12 Knurled Thumb Screws – Black, M3 M4 M5 M6, Zinc‑Plated Steel (Hand Knob Bolts) - HomeDIYer
Plastic Round 12 Knurled Thumb Screws – Black, M3 M4 M5 M6, Zinc‑Plated Steel (Hand Knob Bolts) - HomeDIYer
Plastic Round 12 Knurled Thumb Screws – Black, M3 M4 M5 M6, Zinc‑Plated Steel (Hand Knob Bolts) - HomeDIYer
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Plastic Round 12 Knurled Thumb Screws – Black, M3 M4 M5 M6, Zinc‑Plated Steel (Hand Knob Bolts) - HomeDIYerPlastic Round 12 Knurled Thumb Screws – Black, M3 M4 M5 M6, Zinc‑Plated Steel (Hand Knob Bolts) - HomeDIYerPlastic Round 12 Knurled Thumb Screws – Black, M3 M4 M5 M6, Zinc‑Plated Steel (Hand Knob Bolts) - HomeDIYerPlastic Round 12 Knurled Thumb Screws – Black, M3 M4 M5 M6, Zinc‑Plated Steel (Hand Knob Bolts) - HomeDIYerPlastic Round 12 Knurled Thumb Screws – Black, M3 M4 M5 M6, Zinc‑Plated Steel (Hand Knob Bolts) - HomeDIYerPlastic Round 12 Knurled Thumb Screws – Black, M3 M4 M5 M6, Zinc‑Plated Steel (Hand Knob Bolts) - HomeDIYerPlastic Round 12 Knurled Thumb Screws – Black, M3 M4 M5 M6, Zinc‑Plated Steel (Hand Knob Bolts) - HomeDIYerPlastic Round 12 Knurled Thumb Screws – Black, M3 M4 M5 M6, Zinc‑Plated Steel (Hand Knob Bolts) - HomeDIYer

Plastic Round 12# Knurled Thumb Screws – Black, M3 M4 M5 M6, Zinc‑Plated Steel (Hand Knob Bolts)

HomeDIYer
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By HomeDIYer®

Price:
$5.96 USD
Stock:
In stock (500 units), ready to be shipped

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Description

🔘 Plastic Round Knurled Thumb Screws – 12# Head, Black, M3 M4 M5 M6, Zinc‑Plated Steel Thread

You need a thumb screw that’s comfortable to grip, easy to turn by hand, and affordable. These black plastic knurled thumb screws feature a large 12# round head (12.1mm diameter) with a fine diamond knurled surface – no tools required. The threaded stud is made from zinc‑plated iron (carbon steel) for good strength and moderate corrosion resistance. Available in M3, M4, M5, and M6 metric thread sizes, with a range of thread lengths to choose from (select from dropdown). Perfect for household hardware, furniture, home appliances, toys, fitness equipment, electrical enclosures, and DIY projects where quick, tool‑less access is a plus.

✨ Key Features – Black Plastic Knurled Thumb Screws

  • 🔘 Large 12# round knurled head (12.1mm) – Provides excellent fingertip grip for hand tightening – no tools needed.
  • ⚫ Black plastic head – Non‑conductive, lightweight, and comfortable in cold or hot environments. Resists scratches and corrosion.
  • 🛡️ Zinc‑plated steel threaded stud – Offers moderate corrosion resistance for indoor and light outdoor use. Strong and durable.
  • 📏 Metric sizes M3, M4, M5, M6 – Covers small to medium applications in furniture, electronics, and machinery.
  • 📐 Fully threaded stud, length under head – Thread runs the entire length under the head for maximum grip in tapped holes or with nuts.
  • 🏭 Widely used – Household hardware, furniture, home appliances, toys, building decoration, fitness equipment, electrical/electronic products, communication equipment, automotive and ship manufacturing, containers, and more.

📏 Specifications – Black Plastic Knurled Thumb Screws

Thread Size (M) Thread Pitch (mm) Head Type Head Diameter Head Thickness Head Material Stud Material / Finish
M3 0.5 Round knurled (12#) 12.1 mm 5.69 mm Black plastic (ABS or similar) Zinc‑plated carbon steel
M4 0.7
M5 0.8
M6 1.0

* Thread length (stud length) measured from underside of head to tip. Fully threaded. Select exact thread diameter and length from dropdown. Custom lengths available – contact us for 12#‑48# screw sizes in stock.

🛠️ Common Applications for Plastic Thumb Screws

Area Typical Use
Household hardware & furniture Tool‑less drawer stops, shelf brackets, cabinet handles
Home appliances Access panels on washing machines, dryers, small kitchen appliances
Toys & fitness equipment Adjustable parts, battery covers, assembly knobs
Electrical & electronic products Enclosure covers, terminal covers, prototyping
Automotive & ship manufacturing Interior trim panels, inspection hatches

❓ Frequently Asked Questions – Plastic Knurled Thumb Screws

1. How do I measure the length of a thumb screw?

For these thumb screws, the length is measured from the underside of the plastic head to the tip of the threaded metal stud. The head itself is NOT included. For example, an “M5 x 15mm” screw has a 15mm long threaded shaft under the head. Select your required stud length from the dropdown.

2. Are the plastic heads removable? Can I replace them?

The plastic head is permanently fixed (molded or pressed) onto the metal stud. They are not designed to be removed. If you need a different head style or colour, please contact us for custom options.

3. Will the zinc‑plated stud rust? Can I use these outdoors?

Zinc plating provides moderate corrosion resistance – suitable for indoor use and occasional light outdoor exposure. For continuous outdoor or marine environments, consider stainless steel thumb screws (available in our store).

4. Do I need a nut or washer with these screws?

If you have a pre‑tapped hole (e.g., a threaded insert in plastic or metal), no nut is needed. If you are fastening through a plain hole, use a standard metric nut of the same thread size. Washers are optional for load distribution.

5. What sizes do you have in stock?

We stock 12#‑48# size thumb screws (head diameters). For specific thread sizes and lengths, please contact customer service. Custom orders are welcome.

6. Is the head truly non‑conductive? Can I use these on electrical equipment?

Yes – the black plastic head is electrically insulating. However, the metal stud is conductive. For complete insulation, use a plastic washer or ensure the stud does not contact live circuits. They are safe for low‑voltage enclosure covers.

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