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Why choose
AP Energy

AP Energy Products is manufacturing and exporting firm that offers a wide range of API 20E Bolting, which has proven results as a filler wire in many applications. API 20E Bolt has, by virtue of its contents of tungsten, chromium, molybdenum, and controlled iron. API 20E standard specifies requirements for the qualification, production and documentation of Alloy and Carbon Steel Bolting for Use in the Petroleum and Natural Gas Industries. The API 20E specification establishes three bolting specification levels (BSL-1, BSL-2 and BSL-3). These BSLs define ascending levels of technical, quality and qualification requirements. Increasing levels of severity reflect increased consequence of bolting failure. To ensure material traceability, the raw material is procured only from steel mills. We manufacture to below bolting grades. Huge emphasis is laid on the traceability of the material using heat-numbers, heat lots and production lots. Qualification to a higher BSL shall qualify to a lower BSL. The following paragraphs describe the conditions which, when met, allow the bolting to meet the appropriate bolting type and BSL classification level.

API 20E Bolt Specification

API 20E Bolting Specifications
ASTM 193 API 20E
API 20E Bolting size1.625 - 8 UNR - 2A
Typical Steel Grades4140, 4142, 4145, 4140H, 4142H, 4145H
Melting RouteContinuous, Ingot
CertificationDual Certified As per ASTM & ASME Codes

API 20E Bolting Material

Stud Grade
Nut GradeSteel Grade
ASTM A193 B7ASTM A194 2H4140
ASTM A193 B7MASTM A194 2HM4140
ASTM A320 L7ASTM A194 74140
ASTM A320 L7MASTM A194 7M4140

API 20E Bolting Types

  • Machined studs;
  • Machined bolts, screws, and nuts;
  • Cold formed bolts, screws, and nuts with cut or cold formed threads (BSL-1 only);
  • Hot formed bolts and screws <1.5 in. (38.1 mm) nominal diameter;
  • Hot formed bolts and screws 1.5 in. (38.1 mm) nominal diameter;
  • Roll threaded studs, bolts, and screws <1.5 in. (38.1 mm) diameter;
  • Roll threaded studs, bolts, and screws 1.5 in. (38.1 mm) diameter;
  • Hot formed nuts <1.5 in. (38.1 mm) nominal diameter;
  • Hot formed nuts 1.5 in. (38.1 mm) nominal diameter.

API 20E Bolting Heat Treatment Requirements

BSL1 Requirements
Manufacturing processes shall be performed so as to avoid the introduction of stress risers that can occur from sharp angles and tool marks. Threads may be cut or rolled. Unified National Threads shall be "R" (UNR controlled radius root) series. Furnace calibration shall be in accordance with API 6A, Annex M, SAE AMS 2750 or SAE AMS-H-6875. For induction or direct resistance heat treatment, calibration shall be in accordance with the manufacture’s written procedure.
BSL2 RequirementsASTM A320 Grade L43 and ASTM A540, Grade B23 shall be double tempered. When threads are rolled, parts shall subsequently be stress relieved at a temperature within 50oF (28oC) of, but not exceeding the final tempering temperature.
BSL3 RequirementsAustenitizing temperatures shall not exceed 1700F (925C). Tempering temperatures for ASTM A193, Grade B7, ASTM A320, Grade L7, and Grade L43, and ASTM A540 Grade B23 shall not exceed 1300oF (700oC).

API 20E Bolting Marking Requirements

Material Designation
Marking
ASTM A193 GRADE B7TB B7
ASTM A193 GRADE B7MTB B7M
ASTM A320 GRADE L7TB L7
ASTM A320 GRADE L7MTB L7M
ASTM A320 GRADE L43TB L43
ASTM A194 GRADE 2HTB 2H
ASTM A194 GRADE 4TB 4L
ASTM A194 GRADE 7TB 7L
ASTM A194 GRADE 2HMTB 2HM
ASTM A194 GRADE 7MTB 7M
ASTM A540 GRADE B22TB B22
ASTM A540 GRADE B23TB B23
  • Notes: Additionally Bolting shall be marked with unique heat lot identification and the following:
  • “API 20E2” for BSL-2,
  • “API 20E3” for BSL-3.