5pcs Knurled Plastic Adjustment Knobs M3–M8 with Brass Nut Insert
5pcs Knurled Plastic Adjustment Knobs M3–M8 with Brass Nut Insert
Details
5-Pack Knurled Hand-Tightening Knobs with Embedded Brass Nut
Upgrade your DIY builds, machinery, and equipment with these premium knurled plastic adjustment knobs. Available in M3, M4, M5, M6, and M8 thread sizes, each knob features an embedded brass nut insert — available in both blind hole and through-hole configurations — for a secure, rattle-free fit. The textured knurled surface gives you confident tool-free hand-tightening every time.
Made in Mainland China. CE certified.
Key Features
- 5-piece set — one knob per size: M3, M4, M5, M6, and M8
- Embedded brass nut insert — provides strong, corrosion-resistant threading
- Blind hole & through-hole types — versatile for many applications
- Knurled grip surface — easy hand-tightening without tools
- Durable plastic body (Bakelite/Thermoplastic) — lightweight yet sturdy
- CE Certified — meets quality and safety standards
Size Guide
| Thread Size | Knob Diameter |
|---|---|
| M3 | 15 mm |
| M4 | 15 mm |
| M5 | 15 mm / 22 mm |
| M6 | 18 mm / 22 mm |
| M8 | 25 mm / 30 mm |
| M10 | 30 mm / 40 mm |
| M12 | 50 mm |
Common Applications
- 3D printers, CNC machines, and laser cutters
- Electronic enclosures and control panels
- Woodworking jigs, fixtures, and clamps
- DIY robotics and automation projects
- Furniture assembly and equipment adjustment
Related Products
Looking for more hardware and fastening solutions? Check out these items from our store:
- 10PCS Stainless Steel Self-Tapping Screws M2.2–M4.8 Phillips
- 10pcs 2-Pin Spring Wire Connectors – Quick Splice Lock Terminals
- 10pcs Durable Gold Blade Nut Metal Universal Trimmer Accessories
Learn more: OSHA guidance on hand and power tools
Frequently Asked Questions
Q: What is the difference between blind hole and through-hole knurled knobs?
A: A blind hole knob has a threaded insert that does not pass all the way through — ideal for mounting onto a bolt or stud with a fixed length. A through-hole knob has an open channel running the full length of the insert, allowing a longer bolt or threaded rod to pass completely through, giving you more flexibility in installation depth.
Q: Are these knobs suitable for outdoor or high-moisture environments?
A: The plastic body is resistant to everyday moisture, and the embedded brass nut provides good corrosion resistance compared to standard steel inserts. For long-term outdoor or high-humidity applications, we recommend applying a light protective coating to the brass nut area for added durability.
Q: What thread pitch do these M3–M8 adjustment knobs use?
A: These knurled knobs follow standard metric coarse thread pitches — M3 (0.5 mm), M4 (0.7 mm), M5 (0.8 mm), M6 (1.0 mm), and M8 (1.25 mm) — compatible with the vast majority of metric fasteners and hardware used in DIY, electronics, and machining projects.
Q: Can I customize the size or color of these knobs?
A: Yes — according to the product specifications, customization is available. Please contact our store with your requirements for thread size, diameter, hole type, or color and we will be happy to assist.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.
Materials + Care
We prioritize quality in selecting the materials for our items, choosing premium fabrics and finishings that ensure durability, comfort, and timeless appeal.
Shipping + Returns
We strive to process and ship all orders in a timely manner, working diligently to ensure that your items are on their way to you as soon as possible.