Hard pins are technically known as wire thread inserts or helical inserts.
These are precision-formed coils of extremely hard, diamond-shaped stainless-steel wire.
Although they look like springs, they functionas a threaded insert.
Primary Purpose: Their main use is to repair damaged or stripped screw threads. If the threads in a hole (especially in some metals like aluminum) get worn out or stripped, you can drill a slightly larger hole, tap new threads, and then screw one of these inserts in. The insert’s internal threads will then match the original screw size, creating a new, much stronger set of threads than the original.

These components serve as gripping or support pads with the following features:
Key Characteristics:
Knurled surface: Provides a non-slip grip on glass, aluminium frames, or other module surfaces
 Rectangular rubber pads: Offer shock absorption, an-scratch, and vibration resistance
 Typically mounted on:
o Vacuum heads
o Linear actuators
o Clamping jaws
o Conveyors or end-of-arm tools (EOATs)

Knurling is a manufacturing process that creates a textured, open diamond-shaped, or linear pattern on a surface to improve grip. The phrase “without knurling” explicitly states that these pads have a
smooth surface, reinforcing what’s visible in the image.