Knurled Thumb Nuts, 5 Pack M4 x D13mm x H9mm Carbon Steel Blind Hole Nuts

Descriptions:
1. Material: The knurled thumb nut is made of carbon steel, with a nickel-plated surface finish, high hardness, wear-resistant, not easy to deform, rust-proof and corrosion-resistant.
2. Advantages: The head has a knurled design to increase friction, and it is easy to install and remove by hand without any tools. The thread is deep, the tooth pitch is uniform, and the fastening force is good.
3. Application: These blind hole knurled thumb nuts are widely used in the machinery industry, furniture fastening, 3D printing parts, etc. Great for items that need quick adjustments. Use them to replace old ones, or just store them for your next install.