BA-FPS Barnard Firing Pin Spring - Non Original

Comp 1.60mm FL123 OD10 TC41.5

Southern Springs manufacture helical compression springs in a whole variety of sizes specific to the application they are to be used in. Compression springs apply force by shorting or compressing.
The first key point to consider is if it sits in a hole the outside diameter is the important measurement, or if a rod goes through the internal bore the inside diameter becomes the more important measurement. Length and strength required is the next thing to consider. Strength is determined by a combination of wire type & gauge, spring diameter and number of coils. Finally the type of ends needed for the job.