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FastSeal Assembly Instructions & Troubleshooting

1. 

Prep - cutting, deburring and cleaning of the tube

2. Pre-set

3. 

Pre-set inspection

4. 

Final installation

To start, please select your tubing OD and wall thickness using Table 1.

FastSeal

 assembly consists of the  

following steps:

1. Prep

For proper tube end preparation see the 

Assembly and Installation Section 

Parker’s Catalog 4300 

or watch our 

techConnect Tube End Prep Video

Tube

Wall Thickness

OD

0.035 0.049 0.065 0.083

1/4"

X

X

3/8"

X

X

1/2"

X

X

X

FastSeal

 connections require pre-setting that can be accomplished by hand with a wrench and is best done with the 

assistance of a fixed vice.

Step 1

 – Place marking tool on tube 

until it bottoms out. Mark around 

OD as shown. If marking tool is not 

available, use insertion depths shown 

in Table 2.

Step 4

 – Insert the tube into the 

FastSeal

 nut to the tube depth 

mark. Twist and push tube to aid the 

insertion. You will feel the tube pop 

past the O-ring and bottom out.

Step 2

 – Thread FastSeal nut onto 

fitting body or mandrel hand tight.  

This is best completed with the 

assistance of a fixed vice if available. 

Step 5

 – Mark the nut and body as 

shown to assist with the FFFT preset.

Step 3

 – Lubricate the end of the tube 

with hydraulic oil to help with insertion 

in the next step.

Step 6

 – Tighten the nut to specified 

FFFT of 7-8 flats. You should feel a 

perceptible torque rise around 7 flats.

2. Pre-set

A heavy deburr, per

 

Figure 1 of at least 1 

mm on the tube is recommended to prevent 

damage to the internal O-ring. Ensure tube 

is clean and all chips and debris have been 

removed from the tube. The deburr dimension 

can be checked visually (roughly the 

thickness of a coin) or with the depth gauge 

on the back end of the marking tool.

CRITICAL STEP:

Figure 1

Recommended deburr

Table 1

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