API 20E Bolting - Speciality Fasteners

API 20E boltings are applied to critical Surface and Subsea equipments used in Oil and Gas industry. API-20E specifications implies stringent quality requirements though the complete manufacturing process which infuses reliability and safety into these fasteners. These Alloy and Carbon Steel fasteners are designed to contain huge pressure and to bear the exposure to harsh unforgiving environment. These are categorised into 9 types (Bolting Type A to Bolting Type I). To certify a bolting to the API 20E specifications, qualifications and re-qualifications of the manufacturing process for these bolting is to be performed.

Three Bolting Specification Levels: API 20E BSL1, API 20E BSL2, API 20E BSL3

Three bolting specification levels have been defined in API 20E specification. Each bolting specification (BSL1, BSL2, BSL3) is unique due to the extent of quality controls that the bolting manufacturer has to establish. These controls start right from stage of raw material purchase and goes upto the final inspection of the product. Based on the pressure and temperature requirements of the equipment to which these fasteners are being applied to, the level of bolting specification is selected.

API 20E Licence #20E-0096

MyCerts @ API

NUBOTECK and the 3 BSLs of API 20E

NUBOTECK has the capability to fulfull all the requirements of all three bolting specification levels, and so have aquired the licence to apply API monogram to these products for all three BSLs. This licence was initially attained in the year 2021. The scope of licence is now expanded to include the products made through hot-working (forging).

Scope of API-20E licence is driven by the method used to manufacture. This comprises majorly of making:

The Body i.e. the geometory
The Threads

NUBOTECK boltings are manufactured under the below approved scope of this licence

Product Type	Body	Threading
Studs	Machined	Machined or Rolled
Nuts	Hot Worked i.e. Forged	Machined
Nuts	Machined	Machined
Bolts/ Screws	Hot Worked i.e. Forged	Machined or Rolled
Bolts/ Screws	Machined	Machined or Rolled

At a very broad level below controls have been established here.

Quality Management System - API Q1
Steel Making Process - Melting, Casting, Hotwork Ratio
Material Properties - Cleanliness, Chemistry, Inclusion, Banding
Heat Treatment - Temperature Cycles, Equipment Calibration
Mechanical Properties - Hardness, Tensile, Yield, Elongation, Impact
Product Manufacuring - Hot Forming, Machining, Rolling, Tapping
Non-Destructive Examination - Volumetric, Surface
Dimensional Properties - Unified National Threads - ASME B1.1; Metric Threads - ASME B1.13M
Coating/ Plating - Hydrogen embrittlement prevention

API 20E Bolting Grades

Boltings made at NUBOTECK comes with reliability and complete peace of mind. Huge emphasis is laid on the traceability of the material at each step. We provide all the test results on our test certificate as per EN 10204 3.1. Generally produced grades of API-20E are given here. The raw material used to manufacture these is procured from the sources meeting the qualificaton requirements of API 20E and API Q1

Grades for External Threaded Botings: Studs/ Bolts/ Screws

ASTM A193 Grade B7, B7M
ASTM A320 Grade L7, L7M, L43

Grades for Internal Threaded Botings: Nuts

ASTM A194 Grade 2H, 2HM, 7, 7M, 43

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