Mae clampiau pibellau JE J1 wedi'u grwpio yn ôl eu nodweddion dylunio a swyddogaethol sylfaenol:
Grŵp # 1 (Mathau “A,” “AHH,” “B,” “D,” “C,” “F,” “FEO,” “FE,” “HD,” “I,” “M,” “ MX, ”“ TB, ”“ SSC, ”a“ G ”
Grŵp # 2 (Mathau “E,” “CTB,” neu “CTW”)
Grŵp # 3 (Mathau o “SLA,” “SLF,” “SLTF,” “SLHD,” “T,” “SLTB,” “SSPC,” a “SLFEO”
Grŵp # 4, (Mathau “J,” “OES,” “TE,” “SEC”)
Grŵp # 5 (Math “LP”)
Grŵp # 6 (Math “H”)
