GRACO 556666 – Fitting – 5/16″ Tube Nut & Sleeve

GRACO 556666 – Fitting – 5/16″ Tube Nut & Sleeve

Brass nut with captive ferrule designed for 5/16 tube connections in high-pressure lubrication systems. Features self-aligning design for easy installation and reliable sealing in pump-to-manifold and injector distribution applications.

Additional Specifications

Captive Ferrule: yes

Tube Size: 5/16 in. Tube

Specifications

Application	On-Road Vehicles
Compatible Material	Oil, Grease
Inside Diameter (in)	0.3125
Material	Brass
Size A (in)	5/16
Style	Compression
System of Measurement	Imperial
Type	Nut Fitting

Features

Self-aligning design for easy installation

Captive ferrule prevents loss during assembly

Brass construction for corrosion resistance

Designed for tube fitting connections

Applications

Lubrication system connections

Pump to manifold lines

Injector distribution systems

High-pressure tube fittings

Compatible Equipment

L12100 lubrication systems

Related Parts

556660 – Brass Nut, w/captive ferrule, 3/16 tube

556651 – Stainless Steel Nut, 1/8 tube

556654 – Stainless Steel Ferrule, 1/8 tube

557963 – Brass Inserts for 5/16 tubing (pack of 20)

Part of the self-aligning ferrules and nuts family for the L12100 system. Old part number was 435-702-503. Part of tube fitting nuts with captive sleeve family. Also available for 3/16 in. tube (556660).

Reference Manuals

L12100EN – C (Page 26)

312054 (Page 26) Grease Jockey Chassis Lubrication System