Mitsubishi Electric QD77MS User Manual page 981

(2) External dimension drawing
(a) Serial absolute synchronous encoder (Q171ENC-W8)
85(3.35)
45
42(1.65)
4- 5.5(0.22)
Appendix - 35
58.5(2.30)
29(1.14) 30(1.18)
7(0.28)
2(0.08)
14(0.55)
A
A'
37.5(1.48)
Appendices
[Unit: mm (inch)]
8.72
(0.34)
Cross-section
diagram AA'