M4-0.70 x 40 mm Socket Head Cap Screw Partially Threaded Stainless Steel 316, 2500 pcs/Pack Nuts while the nylon insert grips

while the nylon insert grips the threads of the bolt

They come in various sizes and are commonly used in automotive and construction applications for enhanced stability and support

High-quality Slotted Low-Profile Precision Shoulder Screw

Split lock washers are designed with a split or gap that creates tension when compressed

M4-0.70 x 40 mm Socket Head Cap Screw Partially Threaded Stainless Steel 316, 2500 pcs/Pack Nuts while the nylon insert gripsHigh quality Socket Head Cap Screw, perfect for various applications. Thread Size: M4 0. 70 Length: 40 mm Grade: 316 Material: Stainless Steel Thread Type: Partially Drive Style: Socket System Of Measurement: Metric