In this article, I have covered the spectacle Blind Dimensions. A spectacle blind is used in piping for positive isolation of the section of a line or equipment during maintenance and shutdown.

ASME B16.48 standard that covers Line Blanks.  This standard covers the dimensions for Spectacle Blind, Spades, and Spacers with pressure class 150, 300, 600, 900, 1500, and 2500 as listed in ASME B16.5.

Spectacle Blind Dimensions

spectacle blind dimensions

Class 150 Spectacle blind Dimensions

Size in InchSize in MMInternal Dia.Outer Dia.Center to CenterThick.Web WidthWeb Thick.Hole DiaSpec. Blind Weight in KgPaddle Blank Weight in kgPaddle Spacer Blank Weight in kg
1/215164560338215.8750.070.030.03
3/420215470338215.8750.10.050.04
125276480338215.8750.140.070.06
1 1/4324273906.438415.8750.350.210.14
1 1/24048831006.438415.8750.460.270.18
250611021206.451419.050.680.410.26
2 1/265731071406.451419.050.70.460.24
380891331506.464419.051.10.710.39
3 1/2901021591759.764519.052.441.540.9
41001141721909.764519.052.811.81.01
51301411942159.776522.2253.372.291.08
615016821924012.776722.2255.393.821.57
820021927630012.7761022.2258.326.072.25
1025027333736015.71021225.415.0411.193.84
1230032440643019.11021525.426.9519.777.18
1435035644847519.11081528.57532.9424.078.87
1640040651154022.41081728.57550.2736.7313.54
1845045754658025.41142031.7561.7947.5514.23
2050050860363528.41212231.7583.6764.8518.82
2460061071475031.81402434.925129.3101.827.49

Class 300 Spectacle blind Flange Dimensions

Size in InchSize in MMInternal Dia.Outer Dia.Center to CenterThick.Web WidthWeb Thick.Hole DiaSpec. Blind Weight in KgPaddle Blank Weight in kgPaddle Spacer Blank Weight in kg
1/2151651656.438415.8750.190.10.09
3/4202164806.438419.050.310.160.14
1252770906.438419.050.360.190.16
1 1/43242791006.438419.050.430.250.17
1 1/24048921156.438422.2250.580.340.24
250611081259.751519.051.190.710.48
2 1/265731271509.751522.2251.640.980.65
380891461709.764522.2252.111.290.81
3 1/29010216218512.764722.2253.352.091.26
410011417820012.764722.2254.012.521.49
513014121323515.776822.2256.984.472.51
615016824827015.776822.2259.346.063.28
820021930533022.4761725.419.4213.086.33
1025027335938525.41022028.57529.2220.558.66
1230032441945028.41022231.7543.931.3112.58
1435035648351531.81082431.7567.8646.5821.27
1640040653657038.11082934.92598.0468.7429.3
1845045759463041.11143134.925128.2391.0637.16
2050050865168544.51213434.925164.75118.4346.31
2460061077281050.81403941.275261.55190.1371.42
Piping Courses

Class 600 Spectacle blind Flange Dimensions

Size in InchSize in MMInternal Dia.Outer Dia.Center to CenterThick.Web WidthWeb Thick.Hole DiaSpec. Blind Weight in KgPaddle Blank Weight in kgPaddle Spacer Blank Weight in kg
1/2151651656.438415.8750.190.10.09
3/4202164806.438419.050.310.160.14
1252770906.457419.050.360.190.16
1 1/43237791009.757519.050.670.380.29
1 1/24043921159.767522.2250.910.510.4
250551081259.757519.051.230.710.52
2 1/2656712715012.767722.2252.211.280.92
3808314617012.767722.2252.851.71.15
3 1/2909615918515.776825.44.072.491.58
410010819121515.776825.46.043.592.44
513013523826519.1861028.57511.46.794.6
615016226429022.4861228.57515.919.86.11
820021231835028.4952231.7528.0518.0310.01
1025026539743035.11052734.9255434.7419.26
1230031545449041.11053134.92580.7853.227.58
1435034648952544.51143438.1100.1966.8233.36
1640039756260550.81243941.275151.24100.7650.48
1845044861065553.81334144.45183.62125.7157.9
2050049767972563.51334844.45269.2183.8585.35
2460059778784073.21525550.8405.6284.72120.88

Class 900 Spectacle blind Flange Dimensions

Size in InchSize in MMInternal Dia.Outer Dia.Center to CenterThick.Web WidthWeb Thick.Hole DiaSpec. Blind Weight in KgPaddle Blank Weight in kgPaddle Spacer Blank Weight in kg
1/2151660806.438422.2250.270.140.13
3/4202167906.441422.2250.340.180.16
12527761006.457425.40.430.230.2
1 1/43237861109.757525.40.810.450.36
1 1/24043951259.767528.5750.980.540.43
2505514016512.757725.42.881.561.32
2 1/2656716219012.767728.5753.822.091.73
3808316519015.767825.44.682.682
410010820323519.1761031.758.484.943.54
513013524428022.4861234.92514.188.375.81
615016228632025.4861331.7521.913.048.86
820021235639535.1952738.145.9627.9318.02
1025026543247041.11053138.178.2148.1630.04
1230031549553547.81053638.1117.3173.5543.76
1435034651856053.81144141.275140.8690.6550.2
1640039757261560.51244644.45188.73124.3164.42
1845044863568566.51335050.8252.97168.3984.57
2050049769675073.21335553.975331.81222.68109.13
2460059783590088.91526766.675579.52389.25190.27

Class 1500 Spectacle blind Flange Dimensions

Size in InchSize in MMInternal Dia.Outer Dia.Center to CenterThick.Web WidthWeb Thick.Hole DiaSpec. Blind Weight in KgPaddle Blank Weight in kgPaddle Spacer Blank Weight in kg
1/2151661806.438422.2250.280.140.13
3/4202167909.741522.2250.520.270.24
12527761009.764525.40.650.350.3
1 1/43235861109.764525.40.820.450.37
1 1/240419512512.770728.5751.30.710.58
2505314016512.770725.42.91.561.33
2 1/2656316219015.776828.5754.782.582.19
3807817220519.1761031.756.363.542.81
410010220624022.4891234.92510.475.964.5
513012825129028.4891541.27519.5511.238.31
615015427932035.1891838.129.0817.1511.93
820020334939541.11023144.4552.2331.4320.8
1025025543248050.81143950.898.3359.5338.79
1230030351857060.51144653.975169.01101.9467.06
1435033357563566.51275060.325229.84138.0791.76
1640038163870576.21335866.675320.1194.78125.32
1845042970277585.91466573.025432.4265.84166.56
2050047875283095.31527279.375540.14338.44201.7
24600575899990111.31788492.075898.71564.9333.8

Class 2500 Spectacle blind Flange Dimensions

Size in InchSize in MMInternal Dia.Outer Dia.Center to CenterThick.Web WidthWeb Thick.Hole DiaSpec. Blind Weight in KgPaddle Blank Weight in kgPaddle Spacer Blank Weight in kg
1/2151667909.738522.2250.530.270.25
3/4202173959.741522.2250.620.320.29
12527831109.764525.40.790.410.37
1 1/4323510213012.764728.5751.560.820.73
1 1/2404111414515.770831.752.391.281.11
2505314317015.770828.5753.752.011.73
2 1/2656316519519.1761031.756.053.262.78
3807819423022.4761234.9259.735.294.43
410010223227528.4892241.27517.349.597.74
513012827632535.1892747.62529.9716.7913.17
615015431437041.1893153.97544.7725.4419.32
820019838444053.81024153.97586.3949.8236.57
1025024847354066.51145066.675161.1893.4367.74
1230028954662079.21146073.025255.01148.27106.73

Disclaimer –  Please check with ASME B16.5 Before using.

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