API 20F BSL -2/3

A leading manufacturer of high integrity bolts and fasteners, including those covered by standard API 20F BSL -2/3.

Description of Material

The following Bolting Material grades are covered by standard API 20F BSL -2/3:

API 6ACRA 718 (120 ksi)
ASTM A453/A453M 660D

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

API 20F BSL -2/3: Forms

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

API 20F BSL -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 20F BSL -2/3: Requirements as per BSL

BSL – 2 Threads shall be UNRC/UNR
Furnace calibration to API 6A Annex M
Reduction Ratio 4:1 min
Thermocouple to be attached during heat treatment
Furnace loading and Quench media to API 6HT, and will include furnace load diagrams
BSL – 3 As per BSL-2
Product analysis in accordance with ASTM A453 Grade 660 Class D, API 6ACRA or UNS R30035 to be performed.
All testing by raw material supplier shall be performed by us.
Testing samples shall be carried out as per standard and relevant BSL


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