JB type conductor diameter variation parallel groove clamp is generally suitable for non-sustainable tension connection with middle & small section aluminum stranded wire or ACSR or steel stranded wire on overhead lightening conductor; on the other hand, it is also applicable for jumping line connection of non straight pole & tower. Based on different materials, parallel groove clamps are made up of iron, aluminum, copper and so on.

Type		Applicable Conductor Diameter (mm)		Dimension (mm)			Bolt Quantity
		Main Line	Branch Line	R1	R2	L
	JB-10	35~50	16~25	5.5	4.0	80	2-M12*45
	JB-20	70~95	16~25	7.5	4.0	108	3-M12*50
	JB-21	70~95	35~50	7.5	5.5
	JB-30	120~150	16~25	9.0	4.0	140	3-M16*60
	JB-31	120~150	35~50	9.0	5.5
	JB-32	120~150	70~95	9.0	7.5
	JB-40	185~240	16~25	11.0	4.0	144	3-M16*65
	JB-41	185~240	35~50	11.0	5.5
	JB-42	185~240	70~95	11.0	7.5
	JB-43	185~240	185~240	11.0	9.0
The body and keeper are made of aluminum alloy, other parts are made of hot dip galvanized steel.