OEM screws for hotends and extruders

I would love to purchase extra screws, to keep on hand.
What are the specs / sizes of the hotend screws, screws to mount the extruders, and the extruder assembly screws?

hotend & extruder spring tension: : M3-14
others are M3 but can only precise the length tomorrow.

I would ask Bambu to sell it and add it to shopping cart.

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