General Details

Double Ferrule Stainless Steel Compression Fittings have been designed and developed to meet the demands for reliability and high precision standards. The Alco-Lok range includes Imperial and Metric sizes (see data sheets for all sizes).

Metric Dimensions (mm)

T o/d P L M C D F G
Nut
H Body
6 1/8 28 10 19 17 12 14 19
6 1/4 32 14 25.5 17 19 14 23
6 3/8 34 14 25 17 24 14 25
6 1/2 36 22 30 17 27 14 27
8 1/8 30 10 23 18 14 17 21
8 1/4 33 14 25.5 18 19 17 24
8 3/8 35 14 25 18 24 17 26
8 1/2 37 22 30 18 27 17 28
10 1/8 33.5 10 23 18 19 19 23
10 1/4 33.5 14 25.5 18 19 19 25
10 3/8 33.5 14 25 18 24 19 27
10 1/2 37.5 22 30 18 27 19 29
12 1/4 36 14 25.5 24 19 22 25
12 3/8 38 14 25 24 24 22 27
12 1/2 40 22 30 24 27 22 29
16 3/8 39 14 25 24 24 27 27
16 1/2 41 22 30 26 27 27 29
18 1/2 41 22 30 26 27 30 29
18 3/4 41 22 30 26 32 30 32

Imperial Dimensions (inch)

T o/d P L M C D F G
Nut
H Body
1/8 1/8 .95 .39 .75 .50 .50 7/16 .69
1/8 1/4 1.07 .59 .88 .50 .69 7/16 .81
3/16 1/8 .98 .39 .75 .54 .50 1/2 .72
1/4 1/8 1.04 .39 .75 .60 .50 9/16 .75
1/4 1/4 1.17 .59 .88 .60 .69 9/16 .88
5/16 1/8 1.17 .39 .75 .64 .63 5/8 .88
5/16 1/4 1.20 .59 .88 .64 .69 5/8 .91
3/8 1/8 1.20 .39 .75 .66 .63 11/16 .91
3/8 1/4 1.23 .59 .88 .66 .69 11/16 .94
3/8 3/8 1.32 .59 .88 .66 .81 11/16 1.03
3/8 1/2 1.41 .78 1.12 .66 1.00 11/16 1.12
1/2 1/4 1.38 .59 .88 .90 .81 7/8 .98
1/2 3/8 1.43 .59 .88 .90 .81 7/8 1.03
1/2 1/2 1.52 .78 1.12 .90 1.00 7/8 1.12
5/8 3/8 1.46 .59 .88 .96 .94 1 1.06
5/8 1/2 1.52 .78 1.12 .96 1.00 1 1.12
3/4 1/2 1.51 .78 1.12 .96 1.06 1-1/8 1.11
3/4 3/4 1.65 .81 1.25 .96 1.25 1-1/8 1.25
Features
  • All components from the same material
  • High pressure applications
  • Seal pressures that will burst the tubing
  • Impulse and vibration resistant
  • Repeated make and break connections
  • Nut threads are silver plated to prevent galling
  • No tube rotation or torque transmission on make up
Materials
Ali Bronze – NES 833 Alloy C276 / C22 Alloy 20 Alloy 400
Alloy 625 Alloy 825 F44 (S31254) F51 (S31803)
F53 (S32750) F55 (S32760) Titanium 904L
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