ASME B16.48
Line blanks — spectacle blinds, spacers and paddle blanks
Covers line blanks — spectacle blinds, paddle blanks and spacers — used to isolate piping, sized to fit between B16.5 and B16.47 flanges.
- Dimensional standards
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What to know before ordering to ASME B16.48
The points that decide whether material to ASME B16.48 is accepted at inspection.
- Thickness depends on pressure class and size.
- Spectacle blinds combine a blank and a spacer in one piece.
- Material is usually cut from plate or forged to the flange specification.
How ASME B16.48 fits into an order
A purchase order line is only complete when it names the material standard, the dimensional standard and the inspection document. Miss one and the mill, the inspector and the buyer can each read the order differently.
Related standards
ASME B16.48 — questions buyers ask
What does ASME B16.48 cover?
Covers line blanks — spectacle blinds, paddle blanks and spacers — used to isolate piping, sized to fit between B16.5 and B16.47 flanges.
Does ASME B16.48 specify the material?
No. ASME B16.48 sets dimensions; the material comes from a separate specification such as ASTM A182, A105 or B564 for flanges, or A403 and B366 for fittings. A complete order names both.
Do you supply certificates to this standard?
Yes. Material is supplied with mill test certificates to EN 10204 3.1 showing the standard, grade and heat number; 3.2 with third-party inspection on request.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026