1. External nut type series 43
Compression Fittings
External nut type series 43

2. External nut (compression fittings)
Rugged and durable
General purpose
Wide range of thread and tube sizes
For use with compressed air, compatible oils and water
Can be used with plastic or metal tube
Suitable for low and high operating temperatures*
Vacuum to high pressure*
* see tube pressures

3. Thread and tube sizes
Threads range taper R 1/8, R 1/4, R 3/8, R 1/2, R 3/4, R 1
Threads range parallel G 1/8, G 1/4, G 3/8, G 1/2
Tube range mm o/d 4, 6, 8, 10, 12, 14, 15, 16, 18, 22
Materials
Nickel plated brass body and nut
Brass tubing sleeve
Tube
Thread

4. Parts of a fitting Tubing nut Tubing sleeve Body
Plastic washer on bodies with parallel threads

5. Tube preparation

6. Tube preparation
For plastic tube use a standard tube cutter to give a square end
Ensure that the tube end is clean and free from surface damage
For metal tube use correct cutting equipment and ensure the tube end is free from burrs
900

7. External nut compression fitting
Tube assembly
External nut compression fitting

8. Tube assembly Place the tubing nut and sleeve on to the tube
push the tube in up to the tube stop and hold it there
Screw the tubing nut until finger tight
With a spanner tighten the nut by 11/4 to 11/2 turns
Undo the joint and check the sleeve has been swaged evenly. Reassemble and tighten an extra 1/4 turn

9. Tube assembly Place the tubing nut and sleeve on to the tube
push the tube in up to the tube stop and hold it there
Screw the tubing nut until finger tight
With a spanner tighten the nut by 11/4 to 11/2 turns
Undo the joint and check the sleeve has been swaged evenly. Reassemble and tighten an extra 1/4 turn

10. Tube assembly Place the tubing nut and sleeve on to the tube
push the tube in up to the tube stop and hold it there
Screw the tubing nut until finger tight
With a spanner tighten the nut by 11/4 to 11/2 turns
Undo the joint and check the sleeve has been swaged evenly. Reassemble and tighten an extra 1/4 turn

11. Tube assembly Place the tubing nut and sleeve on to the tube
push the tube in up to the tube stop and hold it there
Screw the tubing nut until finger tight
With a spanner tighten the nut by 11/4 to 11/2 turns
Undo the joint and check the sleeve has been swaged evenly. Reassemble and tighten an extra 1/4 turn

12. Tube assembly Place the tubing nut and sleeve on to the tube
push the tube in up to the tube stop and hold it there
Screw the tubing nut until finger tight
With a spanner tighten the nut by 11/4 to 11/2 turns
Undo the joint and check the sleeve has been swaged evenly. Reassemble and tighten an extra 1/4 turn

13. Tube assembly
Air pressure may then be applied

14. External nut compression fitting
Tube removal
External nut compression fitting

15. Tube removal (compression fitting)
Turn off and exhaust the pressure
Undo the tubing nut and pull out the tube
The tubing sleeve is permanently swaged to the tube
The joint can be made and remade many times
If the tube is cut to shorten it, a new sleeve is required but the tubing nut can be reused

16. Tube removal (compression fitting)
Turn off and exhaust the pressure
Undo the tubing nut and pull out the tube
The tubing sleeve is permanently swaged to the tube
The joint can be made and remade many times
If the tube is cut to shorten it, a new sleeve is required but the tubing nut can be reused

17. Tube removal (compression fitting)
Turn off and exhaust the pressure
Undo the tubing nut and pull out the tube
The tubing sleeve is permanently swaged to the tube
The joint can be made and remade many times
If the tube is cut to shorten it, a new sleeve is required but the tubing nut can be reused

18. Tube removal (compression fitting)
Turn off and exhaust the pressure
Undo the tubing nut and pull out the tube
The tubing sleeve is permanently swaged to the tube
The joint can be made and remade many times
If the tube is cut to shorten it, a new sleeve is required but the tubing nut can be reused

19. External nut compression series 43
Fittings range
External nut compression series 43

20. Fittings range Straight male adaptors taper
Straight male adaptors parallel
Straight female adaptors
Male elbow adaptors
Elbow banjo assemblies
Straight connectors
Elbow connectors
Plugs ( like a solid tubing sleeve )
Reducing connectors

21. Fittings range Tee connectors Male tee adaptors Male side tee adaptors
Four way connectors
Bulkhead connectors
Straight stem adaptors
Stem tailpiece connectors
Tube supports for soft plastic tubing
Conical tubing sleeves and nuts for metal tubing

22. End

24. Pressure rating Plastic tube O/D mm 4 5 6 8 10 12 14 16 22 28
bar maximum
Polyamide (PA) 28 31 25 19 24 18 15 18 15 15
Polyurethane (PU) 10 11 10 9 9 9
Pressure values are for a temperature range -40 OC to +20 OC
For compressed air above 16 bar consult our technical service
Higher temperatures OC
Pressure adjustment factor

25. Pressure rating Copper and steel tube O/D mm 4 5 6 8 10 12 16 22 28
bar maximum
Copper Annealed
128
138
112 81 64 81 59 53 41
Copper Half Hard
193
208
218
157
150
122 89 81 62
Steel
300
250
195
160
Pressure values are for a temperature range -40 OC to +50 OC
For compressed air above 16 bar consult our technical service
Pressure adjustment factors OC
Annealed
100
Half Hard
150
175
200
0.97
0.82
0.63
0.43
0.95
0.88
0.54
0.29

27. Reducing connector
The ferrule has a bore to accept the smaller tube size
The ferrule makes a metal to metal seal in the fitting body
The tubing sleeve is for the smaller tube
The nut has a reduced tube diameter and seat

28. Reducing connector
The ferrule has a bore to accept the smaller tube size
The ferrule makes a metal to metal seal in the fitting body
The tubing sleeve is for the smaller tube
The nut has a reduced tube diameter and seat

29. Reducing connector
The ferrule has a bore to accept the smaller tube size
The ferrule makes a metal to metal seal in the fitting body
The tubing sleeve is for the smaller tube
The nut has a reduced tube diameter and seat

30. Reducing connector
The ferrule has a bore to accept the smaller tube size
The ferrule makes a metal to metal seal in the fitting body
The tubing sleeve is for the smaller tube
The nut has a reduced tube diameter and seat

31. Reducing connector
The ferrule has a bore to accept the smaller tube size
The ferrule makes a metal to metal seal in the fitting body
The tubing sleeve is for the smaller tube
The nut has a reduced tube diameter and seat