🔧 Product Overview: 3/8-16 UNC High‑Type Knurled Thumb Screws – Aluminum Hand Grip + Stainless Steel Thread (6–45mm)
For heavy‑duty hand‑tightening applications requiring a large, comfortable grip and corrosion‑resistant threads, these 3/8-16 UNC high‑type knurled thumb screws are an excellent choice. The anodized aluminum head (20mm diameter, 11mm height) features a stepped shoulder (14mm diameter, 9mm length) and a diamond knurled surface for a secure, non‑slip grip – no tools needed. The stainless steel threaded rod is fully threaded with standard UNC coarse pitch (16 TPI), available in thread lengths from 6mm to 45mm (measured under the shoulder). Perfect for machine tools, camera tripod mounts, bracket shooting, and industrial assembly. Choose from 10 anodized colors: Black, Silver, Green, Royal Blue, Sky Blue, Dark Red, Orange, Rose Red, Golden, and Purple.
✨ Why These High‑Type Stepped Knurled Thumb Screws Are a Workshop Essential
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Dual‑material construction – Anodized aluminum head (lightweight, colorful, corrosion‑resistant) + stainless steel threaded rod (strong, rust‑proof, durable).
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High‑type stepped design – Tall head with a distinct shoulder provides excellent grip and a natural finger stop for easy hand tightening.
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Knurled surface for tool‑less operation – Diamond knurl pattern offers a secure, non‑slip grip – no wrenches or screwdrivers required.
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3/8-16 UNC thread – fully threaded – Standard coarse imperial thread (16 threads per inch). Threads run the entire length for maximum grip and nut compatibility.
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Wide thread length range: 6mm to 45mm – Available in 6,8,10,12,15,18,20,22,25,30,35,40,45mm lengths. Choose exactly what your application needs.
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10 vibrant anodized colors – Black, Silver, Green, Royal Blue, Sky Blue, Dark Red, Orange, Rose Red, Golden, Purple. Match your equipment or add a custom accent.
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Versatile applications – Assembly / machine tools, camera tripod mounts, bracket shooting, industrial machinery, jigs and fixtures, and DIY projects.
📏 Technical Specifications – 3/8-16 UNC High‑Type Knurled Thumb Screws
| Product Type |
High‑Type Knurled Thumb Screws (Stepped Shoulder) |
| Thread Size |
3/8-16 UNC (16 threads per inch, coarse) |
| Thread Type |
Fully threaded |
| Thread Length Range (under shoulder) |
6, 8, 10, 12, 15, 18, 20, 22, 25, 30, 35, 40, 45mm |
| Head Material |
Aluminum alloy (anodized) |
| Thread Material |
Stainless steel |
| Head Diameter |
20mm |
Head Height |
11mm
|
| Shoulder Diameter |
14mm |
| Shoulder Length |
9mm |
| Length Measurement |
Under shoulder – from underside of shoulder to tip (head not included) |
| Available Colors (10) |
Black, Silver, Green, Royal Blue, Sky Blue, Dark Red, Orange, Rose Red, Golden, Purple |
❓ FAQs – 3/8-16 UNC High‑Type Thumb Screws
🔸 What is the advantage of the stepped high‑type head design?
The tall, stepped head provides a larger gripping surface and a natural finger stop, giving you better leverage and control when hand tightening. The shoulder also helps prevent over‑tightening by providing a visual and tactile reference point.
🔸 How do I choose the correct thread length for my application?
Thread length is measured from the underside of the shoulder to the tip. For standard camera tripod mounts (typically 1/4-20 or 3/8-16), a 6‑12mm length is sufficient. For thicker machine panels or when using a nut, choose a length 5‑10mm longer than the total material thickness. Measure your assembly and add 2‑3mm for proper engagement.
🔸 Are these screws fully threaded? What is the thread pitch?
Yes – fully threaded from under the shoulder to the tip. 3/8-16 UNC means 16 threads per inch (coarse thread).
🔸 Will the anodized color fade or wear off?
Anodizing is an electrochemical process that bonds the color to the aluminum surface. It is durable and will not peel like paint. Under normal hand use, the color will remain vibrant for years. Heavy abrasion may wear the finish, but typical thumb screw applications are gentle.
🔸 Can I use these screws with nuts, or are they for tapped holes only?
These are standard machine screws – they work with matching 3/8-16 UNC nuts or in pre‑tapped holes. For through‑hole applications, use a nut on the back side. The knurled head is for hand grip only – do not use tools on the knurling.
🔸 What are the typical applications for 3/8-16 thumb screws?
Common uses include camera tripod mounts (many pro tripods use 3/8-16 threads), machine tool fixtures, jigs, industrial equipment access panels, photography brackets, and heavy‑duty DIY projects where a large hand grip is needed.
