This spring plunger is in stainless steel. Body in stainless steel X8CrNiS18.9 = 1.4305 (AISI 303), bead in stainless steel X46Cr13 = 1.4034 (AISI 420), polished. Spring in spring stainless steel X10CrNi18.8 = 1.4310 (AISI 302).
During our manufacturing process, spring resistance is controlled by electronic and optical measurement devices.

Spring plunger, regular force
| Spring force | |||||||||
| initial | final | ||||||||
| D | D1 | L | H | N | F1(approx. N) | F2(approx. N) | Reference | |
Pack |
| M3 | 1,5 | 7 | 0,5 | 0,4 | 1,5 | 3 | 8370i | 0,2 | 10 pcs |
| M4 | 2,5 | 9 | 0,8 | 0,6 | 4 | 10 | 8371i | 0,6 | 25 pcs |
| M5 | 3 | 12 | 0,9 | 0,8 | 6 | 11 | 8372i | 0,9 | 25 pcs |
| M6 | 3,5 | 14 | 1 | 1 | 9 | 13 | 8373i | 1,5 | 25 pcs |
| M8 | 5 | 16 | 1,5 | 1,2 | 15 | 30 | 8374i | 3,5 | 10 pcs |
| M10 | 6 | 19 | 2 | 1,6 | 20 | 35 | 8375i | 7,0 | 10 pcs |
| M12 | 8 | 22 | 2,5 | 2 | 30 | 55 | 8376i | 10,0 | 10 pcs |
| M16 | 10 | 24 | 3,5 | 2,5 | 65 | 125 | 8377i | 24,0 | 10 pcs |
| M20 | 12 | 30 | 4,5 | 2,5 | 80 | 160 | 8378i | 44,3 | 5 pcs |