🔧 Product Overview: UNC #6-32 Knurled Thumb Screws – Flat Head with Steps, Hand Tighten Bolt (4–40mm)
For tool‑less fastening in PC cases, electronics, and DIY projects, these #6-32 UNC knurled thumb screws offer a comfortable, secure grip. The flat cylindrical head features a stepped design and mesh knurling for excellent finger traction – no screwdriver needed. The head is made from anodized aluminum (12mm diameter, 6mm thick) for lightweight, corrosion‑resistant performance, while the threaded rod is crafted from 304 stainless steel for strength and rust resistance. Fully threaded with standard #6-32 UNC coarse pitch, available in thread lengths from 4mm to 40mm (measured under the head). Choose from 10 anodized colors: Red, Pink, Gold, Jewel Blue, Sky Blue, Black, Silver, Emerald Green, Purple, and Brown. Perfect for computer cases, electric toys, motorcycles, fishing gear, and furniture.
✨ Why These Dual‑Material Knurled Thumb Screws Stand Out
-
Dual‑material construction – Anodized aluminum head (lightweight, colorful, corrosion‑resistant) + 304 stainless steel threaded rod (strong, rust‑proof, durable).
-
Flat stepped head with mesh knurling – The stepped design provides a natural finger stop, and the knurled surface offers a secure, non‑slip grip for hand tightening.
-
10 vibrant anodized colors – Choose from Red, Pink, Gold, Jewel Blue, Sky Blue, Black, Silver, Emerald Green, Purple, or Brown to match your build.
-
UNC #6-32 thread – fully threaded – Standard coarse imperial thread (32 threads per inch). Threads run the entire length for maximum grip and nut compatibility.
-
Wide thread length range: 4mm to 40mm – Select the length that fits your panel thickness or assembly depth. Length measured under the head.
-
Tool‑less operation – No screwdriver or wrench needed. Perfect for frequent access panels and modifications.
-
Lightweight & anti‑strong magnetic – Aluminum head is non‑magnetic and lightweight, safe for sensitive electronics.
-
Wide applications – Computer cases, electric toys, motorcycles, locomotives, fishing gear, furniture, and general DIY.
📏 Technical Specifications – UNC #6-32 Knurled Thumb Screws
| Product Type |
Knurled Thumb Screws (Flat Stepped Head, Hand Tighten) |
| Thread Size |
#6-32 UNC (32 threads per inch, coarse) |
| Thread Type |
Fully threaded |
| Thread Length Range (under head) |
4mm – 40mm (select from options) |
| Length Measurement |
Under head – from underside of head to tip (head not included) |
| Head Material |
Aluminum alloy (anodized) |
| Thread Material |
304 Stainless Steel |
| Head Diameter |
12mm |
| Head Thickness |
6mm |
| Head Style |
Flat cylindrical head with mesh knurling and stepped profile |
| Drive Style |
Hand grip (toolless) |
| Available Colors (10) |
Red, Pink, Gold, Jewel Blue, Sky Blue, Black, Silver, Emerald Green, Purple, Brown |
| Tolerance |
±0.1mm |
❓ FAQs – #6-32 Knurled Thumb Screws
🔸 Will these screws fit my PC case or computer components?
Many PC cases, power supplies, and expansion cards use #6-32 UNC threads for side panels and mounting brackets. Check your existing screws – if they are #6-32, these thumb screws will fit perfectly. The 12mm head diameter provides a comfortable grip while still fitting most case designs.
🔸 How is thread length measured? Which length should I choose?
Thread length is measured from the underside of the flat head to the tip. For standard PC side panels (1‑2mm thick), 4‑6mm is sufficient. For thicker panels (3‑5mm) or when using a nut, choose 8‑12mm. For deeper assemblies, select longer lengths up to 40mm. Measure your material thickness and add 2‑3mm for proper engagement.
🔸 Are these screws fully threaded? What is the thread pitch?
Yes – fully threaded from under the head to the tip. #6-32 UNC means 32 threads per inch (coarse thread).
🔸 Will the anodized color wear off? Is the aluminum head soft?
Anodizing is durable and will not peel like paint. However, aluminum has lower hardness than steel, so avoid using tools on the knurled head – hand tighten only. The anodized finish resists corrosion and maintains its color under normal use.
🔸 Can I use these screws with nuts, or are they for tapped holes only?
These are standard machine screws – they work with matching #6-32 UNC nuts or in pre‑tapped holes. For through‑hole applications, use a nut on the back side. The stainless steel thread ensures good compatibility with steel nuts.
🔸 Are these screws magnetic? Will they affect sensitive electronics?
The aluminum head is non‑magnetic. The 304 stainless steel thread may be slightly magnetic due to cold working, but overall magnetic interference is very low – safe for most electronics and computer components.
