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PREVIOUS
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GAGE BLOCK HEADER PAGE
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B89.1.9-2002 Size Tolerances----Webber Grades
Tolerances are in microinches or (micrometers).
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Webber
Grade -->
B89 Grade
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Webber
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Grade
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Webber
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Grade
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Available
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Grade
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Available
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Grade
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.....
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AS2
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Size
Tolerance
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Variation
in
Length
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Flatness
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Size
Tolerance
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Variation
in
Length
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Flatness
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Size
Tolerance
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Variation
in
Length
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Flatness
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Size
Tolerance
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Variation
in
Length
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Flatness
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Thru .050 in.
(0.5mm)
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+4 / -4
(+.10 / -.10)
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2
(.05)
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2
(.05)
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+6 / -6
(+.14 / -14)
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4
(.10)
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4
(.10)
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+12 / -12
(+.30 / -.30)
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6
(.16)
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6
(.15)
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+24 / -24
(+.60 / -.60)
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12
(.30)
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10
(.25)
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Thru .400 in.
(10.0mm)
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+3 / -3
(+.07 / -.07)
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2
(.05)
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2
(.05)
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+5 / -5
(+.12 / -.12)
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4
(.10)
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4
(.10)
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+8 / -8
(+.20 / -.20)
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6
(.16)
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6
(.15)
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+18 / -18
(+.45 / -.45)
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12
(.30)
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10
(.25)
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Thru 1.000 in.
(25.0mm)
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+3 / -3
(+.07 / -.07)
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2
(.05)
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2
(.05)
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+6 / -6
(+.14 / -14)
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4
(.10)
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4
(.10)
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+12 / -12
(+.30 / -.30)
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6
(.16)
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6
(.15)
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+24 / -24
(+.60 / -.60)
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12
(.30)
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10
(.25)
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Thru 2.000 in.
(50.0mm)
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+4 / -4
(+.10 / -.10)
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2
(.06)
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2
(.05)
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+8 / -8
(+.20 / -.20)
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4
(.10)
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4
(.10)
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+16 / -16
(+.40 / -.40)
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6
(.18)
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6
(.15)
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+32 / -32
(+.80 / -.80)
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12
(.30)
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10
(.25)
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Thru 3.000 in.
(75.0mm)
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+5 / -5
(+.12 / -.12)
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3
(.06)
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Rect 2 (.05)
Sqr 3 (.07)
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+10 / -10
(+.25 / -.25)
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4
(.12)
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4
(.10)
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+20 / -20
(+.50 / -.50)
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6
(.18)
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6
(.15)
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+40 / -40
(+1.0 / -1.0)
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14
(.35)
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10
(.25)
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Thru 4.000 in.
(100.0mm)
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+6 / -6
(+.15 / -15)
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3
(.07)
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Rect 2 (.05)
Sqr 3 (.07)
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+12 / -12
(+.30 / -.30)
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5
(.12)
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4
(.10)
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+24 / -24
(+.60 / -.60)
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8
(.20)
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6
(.15)
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+48 / -48
(+1.2 / -1.2)
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14
(.35)
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10
(.25)
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Thru 5.000 in.
(125.0mm)
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+8 / -8
(+.20 / -.20)
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3
(.08)
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Rect 2 (.05)
Sqr 3 (.07)
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+16 / -16
(+.40 / -.40)
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5
(.14)
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4
(.10)
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+32 / -32
(+.80 / -.80)
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8
(.20)
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6
(.15)
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+64 / -64
(+1.6 / -1.6)
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16
(.40)
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10
(.25)
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Thru 6.000 in.
(150.0mm)
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+8 / -8
(+.20 / -.20)
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3
(.08)
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Rect 2 (.05)
Sqr 3 (.07)
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+16 / -16
(+.40 / -.40)
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5
(.14)
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4
(.10)
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+32 / -32
(+.80 / -.80)
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8
(.20)
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6
(.15)
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+64 / -64
(+1.6 / -1.6)
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16
(.40)
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10
(.25)
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Thru 7.000 in.
(175.0mm)
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+10 / -10
(+.25 / -.25)
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4
(.09)
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4
(.10)
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+20 / -20
(+.50 / -.50)
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6
(.16)
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6
(.15)
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+40 / -40
(+1.0 / -1.0)
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10
(.25)
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7
(.18)
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+80 / -80
(+2.0 / -2.0)
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16
(.40)
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10
(.25)
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Thru 8.000 in.
(200.0mm)
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+10 / -10
(+.25 / -.25)
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4
(.09)
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4
(.10)
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+20 / -20
(+.50 / -.50)
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6
(.16)
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6
(.15)
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+40 / -40
(+1.0 / -1.0)
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10
(.25)
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7
(.18)
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+80 / -80
(+2.0 / -2.0)
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16
(.40)
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10
(.25)
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Thru 10.000 in.
(250.0mm)
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+12 / -12
(+.30 / -.30)
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4
(.10)
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4
(.10)
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+24 / -24
(+.60 / -.60)
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6
(.16)
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6
(.15)
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+48 / -48
(+1.2 / -1.2)
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10
(.25)
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7
(.18)
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+104 / -104
(+2.4 / -2.4)
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18
(.45)
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10
(.25)
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Thru 12.000 in.
(300.0mm)
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+14 / -14
(+.35 / -.35)
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4
(.10)
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4
(.10)
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+28 / -28
(+.70 / -.70)
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7
(.18)
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6
(.15)
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+56 / -56
(+1.4 / -1.4)
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10
(.25)
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7
(.18)
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+112 / -112
(+2.6 / -2.6)
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20
(.50)
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10
(.25)
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Thru 16.000 in.
(400.0mm)
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+18 / -18
(+.45 / -.45)
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5
(.12)
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4
(.10)
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+36 / -36
(+.90 / -.90)
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8
(.20)
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6
(.15)
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+72 / -72
(+1.8 / -1.8)
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12
(.30)
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7
(.18)
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+144 / -144
(+3.6 / -3.6)
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20
(.50)
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10
(.25)
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Thru 20.000 in.
(500.0mm)
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+20 / -20
(+.50 / -.50)
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6
(.14)
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4
(.10)
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+44 / -44
(+1.1 / -1.1)
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10
(.25)
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6
(.15)
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+88 / -88
(+2.2 / -2.2)
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14
(.35)
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7
(.18)
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+176 / -176
(+4.4 / -4.4)
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24
(.60)
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10
(.25)
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The B89.1.9 standard became effective in July, 2002. On January 6, 2003, Webber began to sell gage blocks to the new
B89.1.9-2002 standard. The Federal standard, GGG-G-15C, has been withdrawn.
Webber Gage will continue to sell individual blocks and sets to the obsolete GGG standard.
However a 10% surcharge will apply to the order and the purchase orders must specify compliance to GGG-G-15C.
Orders submitted to Webber that state only a catalog number will be filled using the new B89.1.9 tolerances.
Suggested replacements for the old GGG-G-15C grades are as follows:
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GGG-G-15C Grade
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Webber Grade
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B89 Grade |
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Grade 1
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AA
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00
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Grade 2
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A1
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0
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Grade 3
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---
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AS1
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---
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---
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AS2
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The B89.1.9 standard also contains a special grade of block, Grade K. This grade of block is meant to be used as reference masters in
calibrations where compensations to the deviations of the masters are applied. The geometry of the blocks (flatness and parallelism) are
tightly controlled to minimize measuring errors. The size tolerances are the same as B89.1.9 Grade AS1, but the tolerances for flatness
and variation in length (parallelism) are similar to Grade 00.
Webber Gage does not specifically manufacture Grade K blocks. If Grade K blocks are required, please order Webber Grade AA blocks
and specify compliance to Grade K on the purchase order.
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To Display Tolerances for the old GGG-G-15C specification, Click Here.
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PREVIOUS
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GAGE BLOCK HEADER PAGE
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GB40
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©2018, Webber Gage Division, The L. S. Starrett Co, Westlake, Ohio , 44145
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