Collar

- AISI 4145H alloy steel

- Froged or Rolled

- Length: 10-42 feet

- OD: from 3-1/8" to 11"

-  Whole length heat treatment

- Brinell hardness 285-341

- Every single collar tested (100% higher than API rate)

- API SPEC 7-1

- Cold forming of the thread

- Non-magnetic collar (material YDWC 20-14) available

BLUCKEE | 2020