On this page 6 sections
What ASME B18.2.1 covers
Standard at a glance
- Standard
- ASME B18.2.1 / B18.2.2
- Issued by
- ASME
- Product form
- Bolts
- Grades on site
- 2
The dimensional standards for inch-series bolts (B18.2.1) and nuts (B18.2.2): head and nut sizes, thread lengths and tolerances. Material and strength come from the ASTM specification, such as A193 or A194.
Key requirements
- Head and nut dimensions across flats and corners
- Thread length and tolerance
- Heavy hex dimensions for structural and pressure joints
- Used with ASTM material specifications
Summary for procurement guidance. Refer to the current edition of the standard for full requirements.
Grades supplied to ASME B18.2.1
Ordering to ASME B18.2.1
- State "ASME B18.2.1" and the edition if your project requires it
- Grade / designation and product dimensions
- Supplementary requirements (tests, heat treatment, certification)
- Certificate type: EN 10204 3.1 or 3.2
Frequently asked questions
What does ASME B18.2.1 cover?
The dimensional standards for inch-series bolts (B18.2.1) and nuts (B18.2.2): head and nut sizes, thread lengths and tolerances. Material and strength come from the ASTM specification, such as A193 or A194.
Which grades are covered by ASME B18.2.1?
Do you supply material certified to ASME B18.2.1?
Yes. Material is supplied to ASME B18.2.1 with EN 10204 3.1 certificates (3.2 on request), where the mill certifies to it.