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Gap Gauge
DIG
Tube Depth
Marking Tool
DTM
Part No.
Tube O.D.
(in.)
DTM-4-C
DTM-6-C
DTM-8-C
DTM-10-C
DTM-12-C
DTM-16-C
1/4
3/8
1/2
5/8
3/4
1
metric
Part No.
Tube O.D.
(mm)
DTM-6M-C
DTM-8M-C
DTM-10M-C
DTM-12M-C
DTM-16M-C
DTM-25M-C
6
8
10
12
16
25
This no-go gap gauge is useful tool to inspect the Dk-Lok initially pulled-up.
Operation Instructions
Fractional
1
2
On initial assembly, apply Dk-Lok no-go gap inspection
gauge to make sure that the make-up distance is sufficiently pulled-up.
Refer to Fig 1.
1. The gap gauge does not fit the gap between the nut and the body hex.
This ensures that the fitting is sufficiently tightened on initial assembly.
Refer to Fig 2.
2. The gap gauge fits the gap between the nut and the body hex.
The fitting requires an additional tightening.
Part No.
Fitting Size
in. mm
DIG-468
DIG-5
DIG-12
DIG-16
5/16
3/4
1
-
-
25
This gauge works on eight sizes
1/4, 3/8, 1/2, and 3/4.
6, 10, 12, and 18
Marking on tubing prior to make-up with Dk-Lok.
Operation Instruction
1. Insert tubing into DTM until it is bottomed on tool.
2. Mark the tube at the top of the DTM with a pen.
3. Remove the tube from the DTM and insert into Dk-Lok
fitting until it is bottomed on the shoulder of the fitting
body.
4. If the marking can be seen above the fitting nut, it
indicates the tube not fully bottomed inside the fitting.