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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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