Dimensions of spectacle blinds according to ASME B16.48

Dimensions of spectacle blinds according to  B16.48 for installation between B16.5 flanges.
Material SymbolCMnPSSiNiCrMoCuNVCo
ASTM A1050.350.60-1.050.0350.040.10-0.350.40.30.120.4_0.08_
ASTM A350 LF20.30.60-1.350.0350.040.15-0.300.40.30.120.4_0.080.02
ASTM A182 F3040.0820.0450.0318.0-11.018.0-20.0_____
ASTM A182 F304L0.0320.0450.0318.0-13.018.0-20.0_____
ASTM A182 F3160.0820.0450.03110.0-14.016.0-18.02.00-3.00____
ASTM A182 F316L0.0320.0450.03110.0-15.016.0-18.02.00-3.00____
ASTM A182 F3210.0820.0450.0319.0-12.017.0-19.0_____
EN 10025 S235JR0.21.40.0450.045_____0.01__
20Mn0.17-0.230.70-1.000.0350.0350.17-0.370.30.250.25
200.17-0.230.60-1.000.030.020.17-0.370.250.250.25
16Mn0.13-0.191.20-1.600.030.020.20-0.600.30.30.25
Material SymbolTensile Strength, min, MPaYield point, min, MpaElongation, min, %Reduction of area, min, %Hardness, max, HBMin. ImpactTest Temperature, °C
ASTM A1054852502230187
ASTM A350 LF2485-655250223020-46
ASTM A182 F3045152053050
ASTM A182 F304L4851703050
ASTM A182 F3165152053050
ASTM A182 F316L4851703050
ASTM A182 F3215152053050
20Mn4502752450197
204102452555156

Raised Face Joint Blanks

Raised Face Joint Blanks
Raised Face Joint Blanks
  • ASME B16.48 says: The gasket seating surface finish and dimensions for raised face line blanks shall be in accordance with ASME B16.5. A raised face may be specified at the option of the purchaser.
  • A Raised Face would add machining time and complexity so the price would be higher. Call this the Bugatti or Rolls Royce of the line blind world.
  • Personally, I have seen that version once or twice somewhere. The version without Raised Face is the default and is used everywhere.

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