Not only did Hemingray differentiate between their different insulator styles by using style numbers, but several Hemingray styles were also grouped into series as well:

High Voltage Series
CD 280 No.1 High Voltage CD 281 No.1 High Voltage CD 291 No.1 High Voltage CD 281 No.2 High Voltage CD 291 No.3 High Voltage CD 295 No.4 High Voltage CD 281 No.71 High Voltage CD 295 No.72 High Voltage CD 280 No.100 H.V.

Provo Series
CD 249 No.0 Provo Type CD 283 No.1 Provo Type CD 282 No.2 Provo Type CD 303.5 No.4 Provo Type

Cable Series
CD 251 No.1 Cable/ No. 61 Cable CD 252 No.2 Cable/ No. 62 Cable CD 254 No.3 Cable/ No. 63 Cable

D Series
CD 168 D-510 CD 230 D-512 CD 230.1 D-512 CD 232 D-513 CD 238 D-514 CD 238.1 D-514 CD 299.7 D-514 CD 1052 D-518 CD 1053 D-519 CD 137 D-990

E Series
CD 100.6 E1 CD 128 E1 CD 122.4 E2 CD 233 E3

TS Series
CD 129 TS CD 142 TS-2 CD 142.4 TS-3

51X Series
CD 233.2 No. 511 CD 230 No. 512 CD 232.2 No. 513 CD 238 No. 514 CD 301.5 No. 515 CD 1052 No. 518 CD 1050 No. 519

6XX Series
CD 219 No. 660 CD 218 No. 660 CD 216 No. 661 CD 220 No. 670 CD 221 No. 680

Kimble 8X0 Series
CD 231 No. 820 CD 231.2 No. 820 CD 239 No. 830 CD 239.2 No. 850-1