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B89.1.9-2002 Size Tolerances----Webber Grades Tolerances are in microinches or (micrometers).
Webber Grade --> B89 Grade |
Order . . B89 |
Webber . . Grade |
Grade AA . . 00 |
Order . . B89 |
Webber . . Grade |
Grade A1 . . 0 |
Not
. . B89 |
. . Grade |
....
. . AS1 |
Not
. . B89 |
. . Grade |
....
. . AS2 |
|
. |
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)
|
+4 / -4 (+.10 / -.10) |
2 (.05) |
2 (.05) |
+6 / -6 (+.15 / -15) |
4 (.10) |
4 (.10) |
+12 / -12 (+.30 / -.30) |
6 (.16) |
6 (.15) |
+24 / -24 (+.60 / -.60) |
12 (.30) |
10 (.25) |
|
Thru .400 in. (10.0mm) |
+3 / -3 (+.07 / -.07) |
2 (.05) |
2 (.05) |
+5 / -5 (+.12 / -.12) |
4 (.10) |
4 (.10) |
+8 / -8 (+.20 / -.20) |
6 (.16) |
6 (.15) |
+18 / -18 (+.45 / -.45) |
12 (.30) |
10 (.25) |
|
Thru 1.000 in. (25.0mm) |
+3 / -3 (+.07 / -.07) |
2 (.05) |
2 (.05) |
+6 / -6 (+.15 / -15) |
4 (.10) |
4 (.10) |
+12 / -12 (+.30 / -.30) |
6 (.16) |
6 (.15) |
+24 / -24 (+.60 / -.60) |
12 (.30) |
10 (.25) |
|
Thru 2.000 in. (50.0mm) |
+4 / -4 (+.10 / -.10) |
2 (.06) |
2 (.05) |
+8 / -8 (+.20 / -.20) |
4 (.10) |
4 (.10) |
+16 / -16 (+.40 / -.40) |
6 (.18) |
6 (.15) |
+32 / -32 (+.80 / -.80) |
12 (.30) |
10 (.25) |
|
Thru 3.000 in. (75.0mm) |
+5 / -5 (+.12 / -.12) |
3 (.06) |
Rect 2 (.05) Sqr 3 (.07) |
+10 / -10 (+.25 / -.25) |
4 (.12) |
4 (.10) |
+20 / -20 (+.50 / -.50) |
6 (.18) |
6 (.15) |
+40 / -40 (+1.0 / -1.0) |
14 (.35) |
10 (.25) |
|
Thru 4.000 in. (100.0mm) |
+6 / -6 (+.15 / -15) |
3 (.07) |
Rect 2 (.05) Sqr 3 (.07) |
+12 / -12 (+.30 / -.30) |
5 (.12) |
4 (.10) |
+24 / -24 (+.60 / -.60) |
8 (.20) |
6 (.15) |
+48 / -48 (+1.2 / -1.2) |
14 (.35) |
10 (.25) |
|
Thru 5.000 in. (125.0mm) |
+8 / -8 (+.20 / -.20)) |
3 (.08) |
Rect 2 (.05) Sqr 3 (.07) |
+16 / -16 (+.40 / -.40) |
5 (.14) |
4 (.10) |
+32 / -32 (+.80 / -.80) |
8 (.20) |
6 (.15) |
+64 / -64 (+1.6 / -1.6) |
16 (.40) |
10 (.25) |
|
Thru 6.000 in. (150.0mm) |
+8 / -8 (+.20 / -.20) |
3 (.08) |
Rect 2 (.05) Sqr 3 (.07) |
+16 / -16 (+.40 / -.40) |
5 (.14) |
4 (.10) |
+32 / -32 (+.80 / -.80) |
8 (.20) |
6 (.15) |
+64 / -64 (+1.6 / -1.6) |
16 (.40) |
10 (.25) |
|
Thru 7.000 in. (175.0mm) |
+10 / -10 (+.25 / -.25) |
4 (.09) |
4 (.10) |
+20 / -20 (+.50 / -.50) |
6 (.16) |
6 (.15) |
+40 / -40 (+1.0 / -1.0) |
10 (.25) |
7 (.18) |
+80 / -80 (+2.0 / -2.0) |
16 (.40) |
10 (.25) |
|
Thru 8.000 in. (200.0mm) |
+10 / -10 (+.25 / -.25) |
4 (.09) |
4 (.10) |
+20 / -20 (+.50 / -.50) |
6 (.16) |
6 (.15) |
+40 / -40 (+1.0 / -1.0) |
10 (.25) |
7 (.18) |
+80 / -80 (+2.0 / -2.0) |
16 (.40) |
10 (.25) |
|
Thru 10.000 in. (250.0mm) |
+12 / -12 (+.30 / -.30) |
4 (.10) |
4 (.10) |
+24 / -24 (+.60 / -.60) |
6 (.16) |
6 (.15) |
+48 / -48 (+1.2 / -1.2) |
10 (.25) |
7 (.18) |
+104 / -104 (+2.4 / -2.4) |
18 (.45) |
10 (.25) |
|
Thru 12.000 in. (300.0mm) |
+14 / -14 (+.35 / -.35) |
4 (.10) |
4 (.10) |
+28 / -28 (+.70 / -.70) |
7 (.18) |
6 (.15) |
+56 / -56 (+1.4 / -1.4) |
10 (.25) |
7 (.18) |
+112 / -112 (+2.6 / -2.6) |
20 (.50) |
10 (.25) |
|
Thru 16.000 in. (400.0mm) |
+18 / -18 (+.45 / -.45) |
5 (.12) |
4 (.10) |
+36 / -36 (+.90 / -.90) |
8 (.20) |
6 (.15) |
+72 / -72 (+1.8 / -1.8) |
12 (.30) |
7 (.18) |
+144 / -144 (+3.6 / -3.6) |
20 (.50) |
10 (.25) |
|
Thru 20.000 in. (500.0mm) |
+20 / -20 (+.50 / -.50) |
6 (.14) |
4 (.10) |
+44 / -44 (+1.1 / -1.1) |
10 (.25) |
6 (.15) |
+88 / -88 (+2.2 / -2.2) |
14 (.35) |
7 (.18) |
+176 / -176 (+4.4 / -4.4) |
24 (.60) |
10 (.25) |
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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B89 Grade
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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.
To display tolerances for the old GGG-G-15C specification, click here.
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