Within the framework of the laser integration line (LIL) and the laser megajoule, we describe the design, optical characterization, mounting, alignment, and operation on the LIL of large 420 mm x 470 mm transmission gratings. Two types of grating were manufactured. The first, operating at a wavelength of 1.053 microm, was used for deviation purposes. The second, operating at a wavelength of 0.351 microm, was used for both deviation and focusing purposes. We demonstrate that these large transmission gratings are suitable for nanosecond-regime operation on high-power laser facilities.

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