Knurled Thumb Nuts 4 Pack M4 x D13mm x H13mm 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.