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ANGLE GAGE BLOCK HEADER PAGE
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PREVIOUS
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Angle Gage Block & True Square Tolerances:
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Max. Deviation from Nominal Angle
Material
Flatness of Gaging Surface
Flatness & Parallelism of Sides
Surface Finish (Gaging Surfaces Only)
Squareness of Sides to Gaging Surfaces
Estimated Uncertainty of Measurement (k=2)
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±1.0 seconds
croblox®
6 µin. (0.15 µm)
8 µin. (0.20 µm)
0.4 µin.AA
(0.01 µm AA)
6 seconds
0.6 Seconds
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±2.0 seconds
Steel
8 µin. (0.15 µm)
8 µin. (0.20 µm)
0.6 µin.AA
(0.015 µm AA)
8 seconds
1.0 Seconds
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Note: Angle gage blocks are made to Webber Gage specifications. There is not currently a U.S. or international standard
for Angle Gage Blocks and True Squares.
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NOTE: THE ALTITUDES OF ANGLE GAGE BLOCKS ARE NOT FINISHED. (See Below.) For 15°, 30°, and 45° angle
blocks, the altitude may be finished as a special order at additional cost.
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| Notice of recent changes in angle block calibration (pdf document) |
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Physical Dimensions:
Angle Blocks
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NOTE: THE ALTITUDES OF ANGLE GAGE BLOCKS ARE NOT FINISHED. For 15°, 30°, and 45° angle blocks,
the altitude may be finished as a special order at additional cost.
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Reference Grade |
Calibration Grade |
| Length of Base |
2 inches |
2 inches |
| Width of Base |
1 inch |
1 inch |
| Thickness, 15°, 30°, 45° |
1/4 inch |
1/4 inch |
| Thickness, All others |
3/8 inch |
3/8 inch |
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Knife Edges and Parallels
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| Working Grade Only |
Knife Edge |
Parallel |
| Length |
6 inches |
6 inches |
| Width of Base |
5/8 inch |
5/8 inch |
| Thickness |
3/4 inch |
1/2 inch |
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True Squares
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Reference Grade
TS 21.R
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Calibration Grade
TS 21.C
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Working Grade
TS 44.W
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Working Grade
TS 66.W
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| Length of Base |
2 inches |
2 inches |
4 inches |
6 inches |
| Width of Base |
1 inch |
1 inch |
5/8 inch |
5/8 inch |
| Center Holes |
1/2 inch |
1/2 inch |
2 inch |
2 inch |
| Auxiliary Holes |
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8 Holes 21/64" Dia.
on 3" BCD
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8 Holes 21/64" Dia. on 3" BCD |
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PREVIOUS
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ANGLE GAGE BLOCK HEADER PAGE
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AG2
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©2018, Webber Gage Division, The L. S. Starrett Co, Westlake, Ohio , 44145
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