G5/G9 Melamine Tubes - .750" Wall

G5 G9 Melamine TubesG5-G9 Tubes

G5/G9 Glass Reinforced Melamine - natural (grayish brown) 
This grade is composed of a continuous glass woven cloth base impregnated with a melamine resin binder. Melamines are the hardest of all laminates, exhibiting good dimensional stability and arc resistance. It is also caustic resistant.

NEMA G-5 MIL-I-24768/8 GMG , IEC 60893-3 Type 3 MF GC 201

NEMA G-9 MIL-I-24768/1 GME, IEC 60893-3 Type 3 MF GC 201

G5-G9 Tubes Technical Data Sheet

G5-G9 Tubes Chemical Resistance Chart

NEMA grades G5 and G9 Glass-Cloth Reinforced Melamine -- natural color is typically a grayish brown. These grades are composed of a continuous glass woven cloth base impregnated with a melamine resin binder. (Melamine resins, once cured, are the hardest, most rigid and abrasion resistant of the standard resins employed in the production of industrial laminates. However, prolonged exposure to high temperature can adversely affect its mechanical and electrical strength properties. Arc resistance, however, may remain unaffected despite excessive thermal exposure.) Melamines are the hardest of laminates, exhibiting good dimensional stability and arc resistance. It's also caustic resistant. A key difference between NEMA Grades G5 and G9 are that G9 is more resistant to the elements of the environment. Thus, G9 can be safely substituted where G5 is called for. (G5 certifies to Mil-I-24768/8 GMG; G9 certifies to Mil-I-24768/1 GME.)

G5/G9 Tube Wall Thickness Options

.031" .062" .093" .125"
.187" .250" .375" .500"
.750" 1.00" G5/G9 Sheets G5/G9 Rods

 

Tubes are made in random lengths between 30" - 36".
Our pricing and minimums are based on the 36".

Tubes can also be made in 42" to 48" random lengths for the same pricing.
Measured lengths of 36"±1" and 48"±1" are also available via manual quote.

G5/G9 Melamine Tubes - .750" Wall Thickness
Part # OD (in.) ID (in.) Minimum Price Per Foot Order Online
KM-20072 2.000 .500 3 Feet $363.98 Add to Order
KM-20053 2.062 .562 3 Feet $380.78 Add to Order
KM-20079 2.125 .625 6 Feet $248.50 Add to Order
KM-20078 2.188 .687 6 Feet $258.98 Add to Order
KM-20077 2.250 .750 6 Feet $269.48 Add to Order
KM-20076 2.312 .812 6 Feet $279.97 Add to Order
KM-20075 2.375 .875 6 Feet $290.48 Add to Order
KM-20074 2.437 .937 6 Feet $300.95 Add to Order
KM-20073 2.500 1.000 6 Feet $311.45 Add to Order
KM-20062 2.562 1.062 6 Feet $321.85 Add to Order
KM-20071 2.625 1.125 6 Feet $332.43 Add to Order
KM-20081 2.688 1.187 3 Feet $342.85 Add to Order
KM-20069 2.750 1.250 3 Feet $353.43 Add to Order
KM-20068 2.812 1.312 3 Feet $363.83 Add to Order
KM-20067 2.875 1.375 3 Feet $374.40 Add to Order
KM-20066 2.937 1.437 3 Feet $384.83 Add to Order
KM-20065 3.000 1.500 3 Feet $395.40 Add to Order
KM-20064 3.062 1.562 3 Feet $405.80 Add to Order
KM-20034 3.125 1.625 3 Feet $416.38 Add to Order
KM-20080 3.188 1.687 3 Feet $426.80 Add to Order
KM-20051 3.250 1.750 3 Feet $437.38 Add to Order
KM-20022 3.312 1.812 3 Feet $447.78 Add to Order
KM-20021 3.375 1.875 3 Feet $458.35 Add to Order
KM-20020 3.437 1.937 3 Feet $468.75 Add to Order
KM-20019 3.500 2.000 3 Feet $479.33 Add to Order
KM-20018 3.562 2.062 3 Feet $489.75 Add to Order
KM-20017 3.625 2.125 3 Feet $500.33 Add to Order
KM-20016 3.687 2.187 3 Feet $510.72 Add to Order
KM-20005 3.750 2.250 3 Feet $521.30 Add to Order
KM-20014 3.812 2.312 3 Feet $531.73 Add to Order
KM-19146 3.875 2.375 3 Feet $542.30 Add to Order
KM-20023 3.937 2.437 3 Feet $552.70 Add to Order
KM-20012 4.000 2.500 3 Feet $563.28 Add to Order
KM-20011 4.062 2.562 3 Feet $573.70 Add to Order
KM-20010 4.125 2.625 3 Feet $584.28 Add to Order
KM-20009 4.187 2.687 3 Feet $594.68 Add to Order
KM-20008 4.250 2.750 3 Feet $605.25 Add to Order
KM-20007 4.312 2.812 3 Feet $615.65 Add to Order
KM-20032 4.375 2.875 3 Feet $626.23 Add to Order
KM-20013 4.437 2.937 3 Feet $636.65 Add to Order
KM-20015 4.500 3.000 3 Feet $647.22 Add to Order
KM-20041 4.562 3.062 3 Feet $657.63 Add to Order
KM-20040 4.625 3.125 3 Feet $668.20 Add to Order
KM-20039 4.687 3.187 3 Feet $678.63 Add to Order
KM-20038 4.750 3.250 3 Feet $689.20 Add to Order
KM-20037 4.812 3.312 3 Feet $699.60 Add to Order
KM-20036 4.875 3.375 3 Feet $710.18 Add to Order
KM-20035 4.937 3.437 3 Feet $720.58 Add to Order
KM-20024 5.000 3.500 3 Feet $731.18 Add to Order
KM-20033 5.062 3.562 3 Feet $741.58 Add to Order
KM-20042 5.125 3.625 3 Feet $752.15 Add to Order
KM-20031 5.187 3.687 3 Feet $762.55 Add to Order
KM-20030 5.250 3.750 3 Feet $773.13 Add to Order
KM-20029 5.312 3.812 3 Feet $783.55 Add to Order
KM-20028 5.375 3.875 3 Feet $794.13 Add to Order
KM-20027 5.437 3.937 3 Feet $804.53 Add to Order
KM-1733 5.500 4.000 3 Feet $815.10 Add to Order
KM-19920 5.562 4.062 3 Feet $825.53 Add to Order
KM-20060 5.625 4.125 3 Feet $836.10 Add to Order
KM-19946 5.688 4.187 3 Feet $846.50 Add to Order
KM-19832 5.750 4.250 3 Feet $857.07 Add to Order
KM-19831 5.812 4.312 3 Feet $867.48 Add to Order
KM-19830 5.875 4.375 3 Feet $878.08 Add to Order
KM-19829 5.938 4.438 3 Feet $888.47 Add to Order
KM-1738 6.000 4.500 3 Feet $899.05 Add to Order
KM-19827 6.063 4.562 3 Feet $909.45 Add to Order
KM-19826 6.125 4.625 3 Feet $920.03 Add to Order
KM-19815 6.187 4.687 3 Feet $930.45 Add to Order
KM-19824 6.250 4.750 3 Feet $941.03 Add to Order
KM-19833 6.312 4.812 3 Feet $951.43 Add to Order
KM-19822 6.375 4.875 3 Feet $1,078.05 Add to Order
KM-19821 6.437 4.937 3 Feet $1,089.73 Add to Order
KM-1743 6.500 5.000 3 Feet $1,101.58 Add to Order
KM-19819 6.562 5.062 3 Feet $1,113.25 Add to Order
KM-19818 6.625 5.125 3 Feet $1,125.10 Add to Order
KM-19817 6.688 5.187 3 Feet $1,136.75 Add to Order
KM-19842 6.750 5.250 3 Feet $1,148.60 Add to Order
KM-19823 6.812 5.313 3 Feet $1,160.28 Add to Order
KM-19825 6.875 5.375 3 Feet $1,172.13 Add to Order
KM-19851 6.938 5.437 3 Feet $1,183.80 Add to Order
KM-1749 7.000 5.500 3 Feet $1,195.65 Add to Order
KM-19849 7.062 5.562 3 Feet $1,207.30 Add to Order
KM-19848 7.125 5.625 3 Feet $1,219.15 Add to Order
KM-19847 7.187 5.687 3 Feet $1,230.83 Add to Order
KM-19846 7.250 5.750 3 Feet $1,242.68 Add to Order
KM-19845 7.312 5.812 3 Feet $1,254.35 Add to Order
KM-19834 7.375 5.875 3 Feet $1,266.20 Add to Order
KM-19843 7.437 5.937 3 Feet $1,277.85 Add to Order
KM-1755 7.500 6.000 3 Feet $1,289.70 Add to Order
KM-19841 7.562 6.062 3 Feet $1,258.70 Add to Order
KM-19840 7.625 6.125 3 Feet $1,270.33 Add to Order
KM-19839 7.688 6.187 3 Feet $1,281.80 Add to Order
KM-19838 7.750 6.250 3 Feet $1,293.43 Add to Order
KM-19837 7.812 6.312 3 Feet $1,304.90 Add to Order
KM-19836 7.875 6.375 3 Feet $1,316.53 Add to Order
KM-19835 7.938 6.437 3 Feet $1,327.98 Add to Order
KM-19806 8.000 6.500 3 Feet $1,339.63 Add to Order
KM-19778 8.062 6.562 3 Feet $1,351.07 Add to Order
KM-19816 8.125 6.625 3 Feet $1,362.73 Add to Order
KM-19793 8.188 6.687 3 Feet $1,374.18 Add to Order
KM-19792 8.250 6.750 3 Feet $1,385.83 Add to Order
KM-19791 8.312 6.812 3 Feet $1,397.27 Add to Order
KM-19790 8.375 6.875 3 Feet $1,408.93 Add to Order
KM-19789 8.437 6.938 3 Feet $1,420.38 Add to Order
KM-19788 8.500 7.000 3 Feet $1,432.02 Add to Order
KM-19777 8.562 7.062 3 Feet $1,443.48 Add to Order
KM-19786 8.625 7.125 3 Feet $1,455.10 Add to Order
KM-19795 8.688 7.187 3 Feet $1,466.58 Add to Order
KM-19784 8.750 7.250 3 Feet $1,478.20 Add to Order
KM-19783 8.812 7.312 3 Feet $1,489.68 Add to Order
KM-19782 8.875 7.375 3 Feet $1,501.30 Add to Order
KM-19781 8.938 7.437 3 Feet $1,512.78 Add to Order
KM-19780 9.000 7.500 3 Feet $1,524.40 Add to Order
KM-19779 9.062 7.562 3 Feet $1,535.85 Add to Order
KM-19804 9.125 7.625 3 Feet $1,547.50 Add to Order
KM-19785 9.188 7.687 3 Feet $1,558.95 Add to Order
KM-19787 9.250 7.750 3 Feet $1,570.60 Add to Order
KM-19813 9.312 7.812 3 Feet $1,582.05 Add to Order
KM-19812 9.375 7.875 3 Feet $1,593.70 Add to Order
KM-19811 9.437 7.937 3 Feet $1,605.15 Add to Order
KM-19810 9.500 8.000 3 Feet $1,616.80 Add to Order
KM-19808 9.625 8.125 3 Feet $1,639.90 Add to Order
KM-19807 9.688 8.187 3 Feet $1,651.35 Add to Order
KM-19796 9.750 8.250 3 Feet $1,662.98 Add to Order
KM-19805 9.812 8.312 3 Feet $1,674.45 Add to Order
KM-19814 9.875 8.375 3 Feet $1,686.07 Add to Order
KM-19803 9.937 8.437 3 Feet $1,697.55 Add to Order
KM-19802 10.00 8.500 3 Feet $1,709.18 Add to Order
KM-19801 10.062 8.562 3 Feet $1,720.63 Add to Order
KM-19800 10.125 8.625 3 Feet $1,732.27 Add to Order
KM-19799 10.187 8.687 3 Feet $1,743.73 Add to Order
KM-19798 10.250 8.750 3 Feet $1,755.38 Add to Order
KM-19870 10.313 8.812 3 Feet $1,766.83 Add to Order
KM-19794 10.375 8.875 3 Feet $1,778.48 Add to Order
KM-19844 10.437 8.937 3 Feet $1,789.93 Add to Order
KM-19908 10.500 9.000 3 Feet $1,801.58 Add to Order
KM-19147 10.563 9.062 3 Feet $1,813.03 Add to Order
KM-19907 10.625 9.125 3 Feet $1,824.68 Add to Order
KM-19906 10.688 9.187 3 Feet $1,836.13 Add to Order
KM-19905 10.750 9.250 3 Feet $1,847.75 Add to Order
KM-19904 10.813 9.312 3 Feet $1,859.23 Add to Order
KM-19903 10.875 9.375 3 Feet $1,870.85 Add to Order
KM-19902 10.937 9.437 3 Feet $1,882.32 Add to Order
KM-19891 11.000 9.500 3 Feet $1,893.95 Add to Order
KM-19900 11.062 9.562 3 Feet $1,905.40 Add to Order
KM-19909 11.125 9.625 3 Feet $1,917.05 Add to Order
KM-19898 11.188 9.687 3 Feet $1,928.50 Add to Order
KM-19897 11.250 9.750 3 Feet $1,940.15 Add to Order
KM-19896 11.313 9.813 3 Feet $1,951.60 Add to Order
KM-19895 11.375 9.875 3 Feet $1,963.25 Add to Order
KM-19894 11.437 9.937 3 Feet $1,974.70 Add to Order
KM-19893 11.500 10.000 3 Feet $1,986.35 Add to Order
KM-19918 11.562 10.062 3 Feet $1,997.80 Add to Order
KM-19899 11.625 10.125 3 Feet $2,009.45 Add to Order
KM-19901 11.687 10.187 3 Feet $2,020.90 Add to Order
KM-19927 11.750 10.250 3 Feet $2,032.55 Add to Order
KM-19926 11.812 10.312 3 Feet $2,044.00 Add to Order
KM-19925 11.875 10.375 3 Feet $2,055.63 Add to Order
KM-19924 11.937 10.437 3 Feet $2,067.10 Add to Order
KM-19923 12.000 10.500 3 Feet $2,078.73 Add to Order
KM-19922 12.062 10.562 3 Feet $2,090.20 Add to Order
KM-19921 12.125 10.625 3 Feet $2,101.83 Add to Order
KM-19910 12.187 10.687 3 Feet $2,113.27 Add to Order
KM-19919 12.250 10.750 3 Feet $2,124.93 Add to Order
KM-19928 12.313 10.812 3 Feet $2,136.38 Add to Order
KM-19917 12.375 10.875 3 Feet $2,148.03 Add to Order
KM-19916 12.437 10.937 3 Feet $2,159.48 Add to Order
KM-19915 12.500 11.000 3 Feet $2,171.13 Add to Order
KM-19914 12.562 11.062 3 Feet $2,182.58 Add to Order
KM-19913 12.625 11.125 3 Feet $2,194.23 Add to Order
KM-19912 12.687 11.187 3 Feet $2,205.68 Add to Order
KM-19911 12.750 11.250 3 Feet $2,217.33 Add to Order
KM-19882 12.812 11.312 3 Feet $2,228.78 Add to Order
KM-19854 12.875 11.375 3 Feet $2,240.40 Add to Order
KM-19892 12.937 11.437 3 Feet $2,251.88 Add to Order
KM-19869 13.000 11.500 3 Feet $2,263.50 Add to Order
KM-19868 13.062 11.562 3 Feet $2,274.98 Add to Order
KM-19867 13.125 11.625 3 Feet $2,286.60 Add to Order
KM-19866 13.187 11.687 3 Feet $2,298.05 Add to Order
KM-19865 13.250 11.750 3 Feet $2,309.70 Add to Order
KM-19864 13.312 11.812 3 Feet $2,321.15 Add to Order
KM-19853 13.375 11.875 3 Feet $2,332.80 Add to Order
KM-19862 13.437 11.937 3 Feet $2,344.25 Add to Order
KM-19871 13.500 12.000 3 Feet $2,355.90 Add to Order
KM-19860 13.562 12.062 3 Feet $2,367.35 Add to Order
KM-19859 13.625 12.125 3 Feet $2,379.00 Add to Order
KM-19858 13.687 12.187 3 Feet $2,390.45 Add to Order
KM-19857 13.750 12.250 3 Feet $2,402.10 Add to Order
KM-19856 13.812 12.312 3 Feet $2,413.55 Add to Order
KM-19855 13.875 12.375 3 Feet $2,425.18 Add to Order
KM-19880 13.937 12.437 3 Feet $2,436.65 Add to Order
KM-19861 14.000 12.500 3 Feet $2,448.27 Add to Order
KM-19863 14.062 12.562 3 Feet $2,459.75 Add to Order
KM-19889 14.125 12.625 3 Feet $2,471.38 Add to Order
KM-19888 14.187 12.687 3 Feet $2,482.85 Add to Order
KM-19887 14.250 12.750 3 Feet $2,494.48 Add to Order
KM-19886 14.312 12.813 3 Feet $2,505.93 Add to Order
KM-19885 14.375 12.875 3 Feet $2,517.58 Add to Order
KM-19884 14.437 12.937 3 Feet $2,529.03 Add to Order
KM-19883 14.500 13.000 3 Feet $2,540.68 Add to Order
KM-19872 14.562 13.062 3 Feet $2,552.13 Add to Order
KM-19881 14.625 13.125 3 Feet $2,563.78 Add to Order
KM-19890 14.687 13.187 3 Feet $2,575.23 Add to Order
KM-19879 14.750 13.250 3 Feet $2,586.88 Add to Order
KM-19878 14.812 13.312 3 Feet $2,598.33 Add to Order
KM-19877 14.875 13.375 3 Feet $2,609.98 Add to Order
KM-19876 14.937 13.437 3 Feet $2,621.42 Add to Order
KM-19875 15.000 13.500 3 Feet $2,633.05 Add to Order
KM-19874 15.062 13.562 3 Feet $2,644.52 Add to Order
KM-19873 15.125 13.625 3 Feet $2,656.15 Add to Order
KM-19375 15.187 13.687 3 Feet $2,667.63 Add to Order
KM-18919 15.250 13.750 3 Feet $2,679.25 Add to Order
KM-19528 15.312 13.812 3 Feet $2,690.70 Add to Order
KM-19070 15.375 13.875 3 Feet $2,702.35 Add to Order
KM-19069 15.437 13.937 3 Feet $2,713.80 Add to Order
KM-19068 15.500 14.000 3 Feet $2,725.45 Add to Order
KM-19067 15.562 14.062 3 Feet $2,736.90 Add to Order
KM-19066 15.625 14.125 3 Feet $2,748.55 Add to Order
KM-19065 15.687 14.187 3 Feet $2,760.00 Add to Order
KM-19054 15.750 14.250 3 Feet $2,771.65 Add to Order
KM-19063 15.812 14.312 3 Feet $2,783.10 Add to Order
KM-19072 15.875 14.375 3 Feet $2,794.75 Add to Order
KM-19061 15.937 14.437 3 Feet $2,806.20 Add to Order
KM-19060 16.000 14.500 3 Feet $2,817.83 Add to Order
KM-19059 16.062 14.562 3 Feet $2,829.30 Add to Order
KM-19058 16.125 14.625 3 Feet $2,840.92 Add to Order
KM-19057 16.187 14.687 3 Feet $2,852.40 Add to Order
KM-19056 16.250 14.750 3 Feet $2,864.02 Add to Order
KM-19081 16.312 14.812 3 Feet $2,875.48 Add to Order
KM-19062 16.375 14.875 3 Feet $2,887.13 Add to Order
KM-19064 16.437 14.937 3 Feet $2,898.58 Add to Order
KM-19090 16.500 15.000 3 Feet $2,910.23 Add to Order
KM-19089 16.562 15.062 3 Feet $2,921.68 Add to Order
KM-19088 16.625 15.125 3 Feet $2,933.33 Add to Order
KM-19087 16.687 15.187 3 Feet $2,944.78 Add to Order
KM-19086 16.750 15.250 3 Feet $2,956.42 Add to Order
KM-19085 16.812 15.312 3 Feet $2,967.88 Add to Order
KM-19084 16.875 15.375 3 Feet $2,979.52 Add to Order
KM-19073 16.937 15.437 3 Feet $2,990.98 Add to Order
KM-19082 17.000 15.500 3 Feet $3,002.63 Add to Order
KM-19091 17.062 15.562 3 Feet $3,014.08 Add to Order
KM-19080 17.125 15.625 3 Feet $3,025.70 Add to Order
KM-19079 17.187 15.687 3 Feet $3,037.17 Add to Order
KM-19078 17.250 15.750 3 Feet $3,048.80 Add to Order
KM-19077 17.312 15.812 3 Feet $3,060.27 Add to Order
KM-19076 17.375 15.875 3 Feet $3,071.90 Add to Order
KM-19075 17.437 15.937 3 Feet $3,083.35 Add to Order
KM-19074 17.500 16.000 3 Feet $3,095.00 Add to Order
KM-19045 17.562 16.062 3 Feet $3,106.45 Add to Order
KM-19017 17.625 16.125 3 Feet $3,118.10 Add to Order
KM-19055 17.687 16.187 3 Feet $3,129.55 Add to Order
KM-19032 17.750 16.250 3 Feet $3,141.20 Add to Order
KM-19031 17.812 16.312 3 Feet $3,152.65 Add to Order
KM-19030 17.875 16.375 3 Feet $3,164.30 Add to Order
KM-19029 17.937 16.437 3 Feet $3,175.75 Add to Order
KM-19028 18.000 16.500 3 Feet $3,187.40 Add to Order
KM-19027 18.062 16.562 3 Feet $3,198.85 Add to Order
KM-19016 18.125 16.625 3 Feet $3,210.48 Add to Order
KM-19025 18.187 16.687 3 Feet $3,221.95 Add to Order
KM-19034 18.250 16.750 3 Feet $3,233.58 Add to Order
KM-19023 18.312 16.812 3 Feet $3,245.05 Add to Order
KM-19022 18.375 16.875 3 Feet $3,256.68 Add to Order
KM-19021 18.437 16.937 3 Feet $3,268.13 Add to Order
KM-19020 18.500 17.000 3 Feet $3,279.78 Add to Order
KM-19019 18.562 17.062 3 Feet $3,291.23 Add to Order
KM-19018 18.625 17.125 3 Feet $3,302.88 Add to Order
KM-19043 18.687 17.187 3 Feet $3,314.33 Add to Order
KM-19024 18.750 17.250 3 Feet $3,325.98 Add to Order
KM-19026 18.812 17.312 3 Feet $3,337.43 Add to Order
KM-19052 18.875 17.375 3 Feet $3,349.08 Add to Order
KM-19051 18.937 17.437 3 Feet $3,360.53 Add to Order
KM-19050 19.000 17.500 3 Feet $3,372.17 Add to Order
KM-19049 19.062 17.562 3 Feet $3,383.63 Add to Order
KM-19048 19.125 17.625 3 Feet $3,395.25 Add to Order
KM-19047 19.187 17.687 3 Feet $3,406.73 Add to Order
KM-19046 19.250 17.750 3 Feet $3,418.35 Add to Order
KM-19035 19.312 17.812 3 Feet $3,429.83 Add to Order
KM-19044 19.375 17.875 3 Feet $3,441.45 Add to Order
KM-19053 19.437 17.937 3 Feet $3,452.93 Add to Order
KM-19042 19.500 18.000 3 Feet $3,464.55 Add to Order
KM-19041 19.562 18.062 3 Feet $3,476.00 Add to Order
KM-19040 19.625 18.125 3 Feet $3,487.65 Add to Order
KM-19039 19.687 18.187 3 Feet $3,499.10 Add to Order
KM-19038 19.750 18.250 3 Feet $3,510.75 Add to Order
KM-19037 19.812 18.312 3 Feet $3,522.20 Add to Order
KM-19109 19.875 18.375 3 Feet $3,533.85 Add to Order
KM-19033 19.937 18.437 3 Feet $3,545.30 Add to Order
KM-19083 20.000 18.500 3 Feet $3,556.95 Add to Order
Rev. 08-22, 04-22, 02-22, 11-21
 
Phenolic Tube Tolerances
↓ Inside Diameter ↓
Outside Diameter Turned OD
Tolerance
Steel
Mandrel
Built-up
Mandrel
0.125"  to  0.749" ±.005" ±.003" -
0.750"  to  1.999" ±.005" ±.004" -
2.000"  to  4.000" ±.008" ±.006" -
4.001"  -  12.000" ±.025" ** ±.010" -
12.001" - 18.000" ±.030" ** ±.030" ±.060"
18.001" - 24.000" ±.035" ** ±.040" ±.075"
24.001" - 48.000" ±.040" ** ±.060" ±.090"

** Tubes over 8.000" OD are supplied as wound, which
are always fractions of an inch larger than stated OD.

** Tubes turned to the following OD tolerance
can be quoted on request.