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Cooling hole
NSBH
Cooling the hole drilling - Hardened steels drilling

⌀3 - ⌀12
WHSR
Cooling SR hole (Drilling) - SR machining to suppress cracking

⌀3 - ⌀12
PT threads
EDT-PT
For PT threads - threading hardened steels (high quality surface)

PT1/16 - PT1
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