ASME B18.2.1 HEX BOLT — 1-3/8: width across flats 50.65–52.37 mm, head height 20.57–23.88 mm, pitch 6 TPI. Dimensional tolerances per ASME B18.
BOLTS
| Width Across Flats (F) | 50.65–52.37 mm |
| Head Height (H) | 20.57–23.88 mm |
| Pitch | 6 TPI |
| Tensile Strength | — |
| Material | — |
| Surface | — |
Dimensional tolerances per ASME B18.2.1-2012 (hex bolts) (inch series; values converted from inches).
No grade data available
Contact engineering team for verified B2 data reference.
ASME B18.2.1 Hexagon Head Bolt per ASME B18.2.1 specification, available in Grade 5 grade with Plain finish. Engineered for industrial OEM applications requiring 827.0 MPa tensile strength and reliable long-term fastening performance.
50.65–52.37 mm (nominal with the tolerance range shown above)
20.57–23.88 mm (nominal with the tolerance range shown above)
6 TPI
Material: —, surface: —, tensile strength: —.
ASME B18.