API 20E BSL -1/2/3

We reliably provide bolts of a variety of grades, forms, and standards, adhering to API 20E BSL - 1/2/3.

Description of Material

The following Bolting Material grades are covered by standard API 20E BSL – 1/2/3:

ASTM A193 Grades B7/B7M
ASTM A194 Grades 2H/2HM, 7/7M
ASTM A320 Grades L7/L7M, L43
ASTM A540 Grade B23

All products shall meet the requirements of the referenced ASTM specification, and the modifications specified by the API 20E standard and the relevant bolting specification level.

API 20E BSL -1/2/3: Forms

  LoneStar Manufacture 
Stud Bolts
Hexagon Headed Bolting
Socket Headed Bolting
Double Ended and Waisted Studs
Associated OEM Parts

API 20E BSL -1/2/3: Sizes and Threads 

  LoneStar Manufacture 
Metric Coarse
Metric Fine
Imperial UNRC+
Imperial 8UNR
Imperial UNF
Metric sizes available Up to M100
Imperial sizes available Up to 4.00″

API 20E BSL -1/2/3: Requirements as per BSL

BSL – 1 Threads shall be UNRC/UNR
Furnace calibration to API 6A Annex M
Reduction Ratio 4:1 min
BSL – 2 Parts stress relieved after thread rolling
Furnace loading and Quench media to API 6HT, and will include furnace load diagrams
Phosphorus and Sulphur content 0.025% max Boron 0.0005%
All testing by RM. Supplier shall be performed by us.
BSL – 3 As per BSL-2
Min. One thermocouple to be attached during heat treatment
Continuous and Induction heat treatment is prohibited
Reduction ration 10:1 min
Phosphorus and Sulphur content 0.015% max
All testing by RM. Supplier shall be performed by us.
Testing samples shall be carried out as per standard and relevant BSL


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