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NOTE:  A 10% Surcharge will apply to block
conforming to the GGG specification.
GGG-G-15C Tolerances:
Tolerances in microinches or (micrometers).
Webber
Grade -->
.
GGG Grade
Not
.
.
GGG
Available 
.
.
Grade
.......
.
.
0.5
Order
.
.
GGG
Webber 
.
.
Grade
Grade AA
.
.
1
Order 
.
.
GGG
Webber 
.
.
Grade
Grade A1
.
.
2
Not
.
.
GGG
Available 
.
.
Grade
....
.
.
3
.
Size
Tolerance
Variation
in
Length
Flatness
Size
Tolerance
Variation
in
Length
Flatness
Size
Tolerance
Variation
in
Length
Flatness
Size
 Tolerance
Variation
 in
Length
Flatness
Thru .050 in.
    (0.5mm)
+1.0 / -1.0
(+.03 / -.03)
1.0
(.03)
1.0
(.03)
+2 / -2
(+.05 / -.05)
2
(.05)
2
(.05)
+4 / -2
(+.10 / -05)
4
(.10)
4
(.10)
+8 / -4
(+.20 / -.10)
5
(.12)
5
(.12)
Thru .400 in.
   (10.0mm)
+1.0 / -1.0
(+.03 / -.03)
1.0
(.03)
1.0
(.03)
+2 / -2
(+.05 / -.05)
2
(.05)
2
(.05)
+4 / -2
(+.10 / -05)
4
(.10)
4
(.10)
+8 / -4
(+.20 / -.10)
5
(.12)
5
(.12)
Thru 1.000 in.
   (25.0mm)
+1.0 / -1.0
(+.04 / -.04)
1.0
(.03)
1.0
(.03)
+2 / -2
(+.08 / -.08)
2
(.05)
2
(.05)
+4 / -2
(+.15 / -08)
4
(.10)
4
(.10)
+8 / -4
(+.30 / -.15)
5
(.12)
5
(.12)
Thru 2.000 in.
   (50.0mm)
+2.0 / -2.0
(+.05 / -.05)
1.0
(.03)
1.0
(.03)
+4 / -4
(+.10 / -.10)
2
(.05)
2
(.05)
+8 / -4
(+.20 / -.10)
4
(.10)
4
(.10)
+16 / -8
(+.40 / -.20)
5
(.12)
5
(.12)
Thru 3.000 in.
   (75.0mm)
+3.0 / -3.0
(+.08 / -.08)
1.0
(.03)
1.0
(.03)
+5 / -5
(+.13 / -.13)
3
(.07)
3
(.07)
+10 / -5
(+.25 / -.12)
4
(.10)
4
(.10)
+20 / -10
(+.45 / -.22)
5
(.12)
5
(.12)
Thru 4.000 in.
   (100.0mm)
+4.0 / -4.0
(+.10 / -.10)
1.0
(.03)
1.0
(.03)
+6 / -6
(+.15 / -15)
3
(.07)
3
(.07)
+12 / -6
(+.30 / -.15)
4
(.10)
4
(.10)
+24 / -12
(+.60 / -.30)
5
(.12)
5
(.12)
Thru 5.000 in.
   (125.0mm)
.
.
.
+7 / -7
(+.18 / -.18)
3
(.07)
3
(.07)
+14 / -7
(+.35 / -.18)
4
(.10)
4
(.10)
+28 / -14
(+.70 / -.35)
5
(.12)
5
(.12)
Thru 6.000 in.
   (150.0mm)
.
.
.
+8 / -8
(+.20 / -.20)
3
(.07)
3
(.07)
+16 / -8
(+.40 / -.20)
4
(.10)
4
(.10)
+32 / -16
(+.80 / -.40)
5
(.12)
5
(.12)
Thru 7.000 in.
   (175.0mm)
.
.
.
+9 / -9
(+.23 / -.23)
3
(.07)
3
(.07)
+18 / -9
(+.45 / -.22)
4
(.10)
4
(.10)
+36 / -18
(+.90 / -.45)
5
(.12)
5
(.12)
Thru 8.000 in.
   (200.0mm)
.
.
.
+10 / -10
(+.25 / -.25)
3
(.07)
3
(.07)
+20 / -10
(+.50 / -.25)
4
(.10)
4
(.10)
+40 / -20
(+1.0 / -.50)
5
(.12)
5
(.12)
Thru 10.000 in.
   (250.0mm)
.
.
.
+12 / -12
(+.30 / -.30)
4
(.10)
4
(.10)
+24 / -12
(+.60 / -.30)
5
(.12)
5
(.12)
+48 / -24
(+1.2 / -.60)
6
(.15)
6
(.15)
Thru 12.000 in.
   (300.0mm)
.
.
.
+14 / -14
(+.35 / -.35)
4
(.10)
4
(.10)
+28 / -14
(+.70 / -.35)
5
(.12)
5
(.12)
+56 / -28
(+1.4 / -.70)
6
(.15)
6
(.15)
Thru 16.000 in.
   (400.0mm)
.
.
.
+18 / -18
(+.45 / -.45)
4
(.10)
4
(.10)
+36 / -18
(+.90 / -.45)
5
(.12)
5
(.12)
+72 / -36
(+1.8 / -.90)
6
(.15)
6
(.15)
Thru 20.000 in.
   (500.0mm)
.
.
.
+20 / -20
(+.50 / -.50)
4
(.10)
4
(.10)
+40 / -20
(+1.0 / -.50)
5
(.12)
5
(.12)
+80 / -40
(+2.0 / -1.0)
6
(.15)
6
(.15)

				
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GB41
©2008, Webber Gage Division, The L. S. Starrett Co, Cleveland, Ohio , 44145
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