This spring plunger has a black body in thermoplastic, with a stainless steel bead, and a spring in spring steel class D.
During our manufacturing process, spring resistance is controlled by electronic and optical measurement devices.
Product also available in stainless steel.

Spring plunger thermoplastic
| Spring force | ||||||||||
| intial | final | |||||||||
| D+0,1 | D1 | D2 | L | L1 | H | F1(approx. N) | F2(approx. N) | Reference | Pack | |
| 4 | 3 | 4,6 | 5 | 1 | 0,7 | 3 | 7 | 8537 | 0,3 | 50 pcs |
| 5 | 4 | 5,6 | 6 | 1 | 1 | 4 | 7 | 8538 | 0,6 | 50 pcs |
| 6 | 5 | 6,5 | 7 | 1 | 1,5 | 6 | 12 | 8539 | 1,0 | 50 pcs |
| 8 | 6,5 | 8,5 | 9 | 1 | 1,8 | 6 | 12 | 8540 | 2,0 | 50 pcs |