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A N P×(N−1) L A Custom-made Guide Rails A= L − { P  ×( N − 1) } 2 A=      L−{P×(N−2)} 2 A= 1 0 9 0 − { 5 0 ×( 2 2− 1  )} =20 2 The end dimension The end dimension = 20 mm and the number of mounting holes = 22 are found. Calculation example (GR20-1090) Select the special-dimension guide rail 1100 mm (P = 50, N = 22) from above if the necessary guide rail dimension is 1090 mm. (Unit: mm) 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 850 900 950 1000 1050 1100 1150 1200 1250 1300 1350 1400 1450 1500 1550 1600 1650 1700 1750 1800 1850 1900 1950 2000 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 2334455666778899 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17 17 18 19 19 2334455666778899 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17 17 18 19 19 47.5 20 45 17.5 42.5 15 40 12.5 37.5 62.5 35 60 32.5 57.5 30 55 27.5 52.5 25 50 22.5 47.5 20 45 17.5 42.5 15 40 12.5 37.5 10 35 60 32.5 30 55 L A N GR20 GR28 GR38 A. N. N.. . P=50 P=80 P=105 47.5 20 45 17.5 42.5 15 40 12.5 37.5 62.5 35 60 32.5 57.5 30 55 27.5 52.5 25 50 22.5 47.5 20 45 17.5 42.5 15 40 12.5 37.5 10 35 60 32.5 30 55 GR48 A.. . N.. . P=105 23456789 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 35 20 45 30 15 40 25 10 35 20 45 30 15 40 25 10 35 20 45 30 15 40 25 10 35 20 45 30 15 40 25 10 35 20 45 30 15 40 233455677889 10 10 11 12 12 13 13 14 15 15 16 17 17 18 18 19 20 20 21 22 22 23 23 24 25 25 A.. . Expression if A is less than 10 mm (e.g.) When the widit is 20mm and the length is 450mm. GR20-450 ●Select the number of mounting holes of the longer rail shown above if the required length is shorter than the listed L. For dimensions not shown above, select the special-dimension guide rail that accommodates the necessary dimension in the above table and find the value of A (end dimension) from its P (mounting pitch) and N (number of mounting holes) using the following expression. The dimensions of both ends must be the same. ● Product Identification GR W i d t h - Parts No. Length Specify by 278 Selection Guide Product Information Plastic Bearing Multi-layer Bearing Metallic Bearing Air Bearings Technical Slide Shifter Information Corporate Profi le