All Connection Heads come with 1/2" NPT sensor connections.
All RdF connection heads with gasket meet NEMA 4 for dust and moisture resistance. RdF's proprietary heads with threaded-insert molded terminal blocks, “A”, “B”, “G” and “H”, are the world's smallest full performance aluminum heads. All terminal boards accomodate at least 4 terminations with 6 or 8 optional as tabulated below.

	P/N 51590–1   P/N 51590–2		STANDARD CAST ALUMINUM HEAD  4 two–screw straps.   Optional: up to 8 top–screw thread–in posts		1/2 NPT Conduit		Style A - 125°C  Style B - 260°C
	P/N 41333–1   P/N 41333–2		EXPLOSION PROOF CAST ALUMINUM HEAD  4 two–screw straps.   Optional: up to 8 top–screw thread–in posts		1/2 NPT Conduit		Style G - 125°C  Style H - 260°C
	P/N 51840–1		CAST IRON HEAD  4 two–screw straps; Optional: 6 of same		3/4 NPT Conduit		Style C - 260°C
	P/N 52298–1		LARGE CAST ALUMINUM HEAD  4 two–screw straps; Optional: 6 of same		3/4 NPT Conduit		Style E - 260°C
	P/N 54681		HINGED CAST ALUMINUM HEAD  4 two–screw straps		3/4 NPT Conduit		Style J - 125°C
	P/N 55261		DIN B CAST ALUMINUM HEAD  6 two–screw posts		1/2 NPT Conduit		Style K - 100°C

NOTE: OTHER HEAD MATERIALS AVAILABLE (Polypropylene, Stainless Steel). CONSULT FACTORY

	Adjustable Compression Fitting    Part    Number Process Mounting Thread Material Sensor Sheath Diameter   51841-1 1/8 NPT Stainless Steel 0.126   51841-2 1/4 NPT Stainless Steel 0.125   51841-3 1/4 NPT Stainless Steel 0.25   51841-4 1/2 NPT Stainless Steel 0.25