What is ASTM B127 Plate Sheet Strip Size and Tolerance?
ASTM B127 standard is a specification that pertains to dimensions and permissible variations in the thickness of nickel-copper alloy plates. This specification outlines the accepted tolerances for the thickness of plates made from UNS N04400, UNS N04405, UNS N05500, and UNS N05502 alloys.
According to ASTM B127, the thickness of these 2.4360 Monel 400 plates can vary between 0.1875 inches to 4.000 inches, with the permissible range of variation depending on the thickness group specified. For plates with thicknesses between 0.1875 and 1.000 inches, the permissible variation is 0.015 inches. For plates between 1.000 and 2.000 inches thick, the permitted variation is 0.030 inches, and for plates between 2.000 and 4.000 inches thick, the allowed variation may be up to 0.060 inches.
It is important to note that these permissible variations apply to both the plus and minus sides of the specified thickness, meaning that a plate may exceed the maximum thickness limit on one side as long as the opposite side falls within the accepted range.
ASTM B127 Monel 400 Plate Permissible Variations Chart
NOTE 1-All plates shall be ordered to thickness and not to weight per square foot. No plates shall vary more than 0.01 in. (0.25 mm) under the thickness ordered, and the overweight of each lotA in each shipment shall not exceed the amount given in the table. Spot grinding is permitted to remove surface imperfections, such spots not to exceed 0.01 in. (0.25 mm) under the specified thickness.
| Specified Thickness,in. (mm) |
Permissible Excess in Average Weight,B,C per Square Foot of Plates for Widths Given in Inches(millimetres) Expressed in Percentage of Nominal Weights |
|||||||||
| Under 48(1220) |
48 to 60 (1220 to 1520) excl |
60 to 72 (1520 to 1830) excl |
72 to 84 (1830 to 2130), excl |
84 to 96 (2130 to 2440), excl |
96 to 108 (2440 to 2740) excl |
108 to 120 (2740 to 3050), excl |
120 to 132 (3050 to 3350), excl |
132 to 144 (3350 to 3660), excl |
144 to 160 (3660 to 4070), incl |
|
| 3/16 to 5/18 (4.8 to 7.9),excl | 9.0 | 10.5 | 12.0 | 13.5 | 15.0 | 16.5 | 18.0 | ... | ... | ... |
| 5/16 to 3/8 (7.9 to 9.5),excl | 7.5 | 9.0 | 10.5 | 12.0 | 13.5 | 15.0 | 16.5 | 18.0 | ... | ... |
| 3/8 to 7/16 (9.5 to 11.1),excl | 7.0 | 7.5 | 9.0 | 10.5 | 12.0 | 13.5 | 15.0 | 16.5 | 18.0 | 19.5 |
| 7/16 to 1/2 (11.1 to 12.7),excl | 6.0 | 7.0 | 7.5 | 9.0 | 10.5 | 12.0 | 13.5 | 15.0 | 16.5 | 18.0 |
| 1/2 to 5/8 (12.7 to 15.9),excl | 5.0 | 6.0 | 7.0 | 7.5 | 9.0 | 10.5 | 12.0 | 13.5 | 15.0 | 16.5 |
| 5/8 to 3/4 (15.9 to 19.0),excl | 4.5 | 5.5 | 6.0 | 7.0 | 7.5 | 9.0 | 10.5 | 12.0 | 13.5 | 15.0 |
| 3/4 to 1(19.0 to 25.4),excl | 4.0 | 4.5 | 5.5 | 6.0 | 7.0 | 7.5 | 9.0 | 10.5 | 12.0 | 13.5 |
| 1 to 2(25.4 to 50.8),incl | 4.0 | 4.0 | 4.5 | 5.5 | 6.0 | 7.0 | 7.5 | 9.0 | 10.5 | 12.0 |
A The term "lot" applied to this table means all of the plates of each group width and each group thickness.
B The permissible overweight for lots of circular and sketch plates shall be 25 % greater than the amounts given in this table.
C The weight of individual plates shall not exceed the nominal weight by more than 11⁄4 times the amount given in the table and Footnote B.
