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| Wesmec S-Lok® twin ferrule fittings |
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| Nomenclature : |
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| Wesmec S-Lok® fitting part numbers are constructed from symbols that identify the size and the material used. |
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Imperial tube |
| 8 |
MC |
4 |
N |
M |
| Tube O.D. |
Style |
Thread Size |
Thread Type |
Material |
| 1/2 " |
Male Connector |
1/4" |
NPT |
Monel |
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Metric tube |
| 12M |
FC |
1/4 |
N |
316 |
| Tube O.D. |
Style |
Thread Size |
Thread Type |
Material |
| 12mm |
Female Connector |
1/4" |
NPT |
Stainless Steel |
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| How to order : |
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Wesmec S-Lok® tube fittings are ordered by part number as listed in this catalogue.
1-Size.
Imperial tube and pipe thread sizes are designated by the number of sixteenths of an inch.
Eg. ½" tube = 8/16=8,1/4" NPT =4/16=4.
Metric tube is designated in millimeters and prefixed "M".
eg. 12mm tube = 12M. The thread size is written as a fraction eg. ¼ NPT = ¼N. |
Fitting style :
A letter or combination of letters and numbers are used to designate the type of fitting.
Eg. MBT = male branch tee. Please see visual index. |
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| Thread type |
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N = NPT |
ANSI B1.20.1 |
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| B = BSP Taper |
BS21, ISO7/1 |
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| BP = BSPP |
BS2779,ISO 228/1+2,DIN 3852 FORM A |
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| BP = BSPP |
BS2779,ISO 228/1+2,DIN 3852 FORM B |
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| M = METRIC |
BS3643,ISO 261, 262 |
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Materials |
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316 = Stainless steel |
6MO=6MO |
B = Brass |
HC= Hastelloy |
S =Steel |
825= Incoloy 825 |
A = Aluminium |
IN= Inconel 600 |
M = Monel |
T=Titanium |
HDB = High Duty Bronze |
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Wesmec S-Lok® tube fittings can be furnished in almost any material suitable for machining. |
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| Principal : |
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The Wesmec S-Lok® twin ferrule fitting consists of four precision engineered parts designed to provide secure leak- proof joints capable of satisfying high pressure, vacuum and vibration applications.
Fittings are supplied complete and ready for use.The front ferrule swages onto the tube as it moves down the cone of the body creating a pressure/vacuum-tight seal on both tube and body by the interface pressure and surface finish of mating components. The back ferrule then deforms inwards in the cone of the front ferrule, forming into the tube and creating a strong mechanical hold on the tube.
The internal diameter of the body and nut are closely controlled diameters which constrain the tube within a close tolerance of its axis ensuring accurate alignment within the assembled fittings. |
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Quality Assurance |
Product Specification |
Application |
Manufacturing and ordering processes are tightly controlled by a quality assurance programme as perBS 4368 Part IV We have been audited by ABS Quality Evaluations ,Inc.& certified forISO 9001 : 2000 |
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The fittings are widely used in onshore, offshore, chemical, petrochemical and other industries and comply ASTM / BS / IS specifications |
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The Wesmec S-Lok® fitting has been specifically designed for use on instrumentation, process and control systems, together with equipment employed in chemical, chromatography, petroleum, power generation and pulp & paper plants. The Wesmec S-Lok® tube fitting has also found extensive applications in other fields where a very high quality tube fitting is required. |
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Metric tube |
| 12M |
FC |
1/4 |
N |
316 |
| Tube O.D. |
Style |
Thread Size |
Thread Type |
Material |
| 12mm |
Female Connector |
1/4" |
NPT |
Stainless Steel |
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| Materials : |
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Wesmec S-Lok® fittings are available in 316 Stainless Steel ,Brass, Steel, Aluminium, Monel, 6MO, Hastelloy C, Incoloy 825, Inconel 600 and Titanium. Straight fittings are machined from cold finished bar stock and shaped bodies are machined from close grain forgings. The raw materials used fully conform to the chemical requirements of one or more of the specifications listed below.
Typical raw material specifications.
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Material |
Bar |
Forging |
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Stainless steel
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BS970 316-S31
DIN 4401
ASME SA479-316 |
BS970 316-S31
DIN 4401
ASME SA182-316 |
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Brass
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BS2874 CZ121
ASTMB16 ALLOY 360
ASTMB453 ALLOY 345 |
BS2872 CZ122
ASTMB124 ALLOY 377
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Steel |
ASTM A108 |
ASTM A576 |
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Aluminium |
ASTM B211 |
ASTM B211 |
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Monel |
BS 3076 NA 13
ASTM B164 |
BS 3076 NA 13
ASTM B164 |
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Hastelloy C276 |
ASTM B575 |
ASTM B574 |
Incoloy 8 25
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BS 3076 NA16
ASTM B425 |
BS 3076 NA16
ASTM B425 |
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Inconel 600 |
ASTM B 166 |
ASTM B564 |
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| Features : |
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| Wesmec S-Lok® fitting part numbers are constructed from symbols that identify the size and the material used. |
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| Torque |
No distortion |
Sealing |
| Wesmec S-Lok® tube fittings do not twist the tube during installation. The Wesmec S-Lok® fitting design ensures that all make and remake loading is transmitted axially to the tube. Fitting make-up is eased due to a silver plating of the tube nut threads, which acts as an effective lubricant and prevents galling. |
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| In make-up, there is no undue force in an outward direction to distort the fitting body or ferrules to cause interference between the ferrules and the nut. This assures that the nut will back off for disassembly and permits a greater number of end remakes. |
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| Positive, reliable connections with Wesmec S-Lok® fittings have been qualified with exhaustive tests and over two decades of experience in the manufacture of quality tube fittings. Specific product features such as burnished cones for superior sealing and exacting manufacturing tolerances for consistent product quality, all contribute to the effective sealing of the Wesmec S-Lok® fittings.In tests after repeated remakes Wesmec S-Lok® fittings effected a Helium seal at over 200 bar. Vibration and impulse tests in the multi-million cycle range prove outstanding sealing capability and fatigue resistance. |
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Metric tube fittings are identified by a stepped shoulder on both the body and the threaded end of the nut as illustrated. |
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| Selaction : |
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| Wesmec S-Lok® fitting part numbers are constructed from symbols that identify the size and the material used. |
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| Selection of tubing |
| The Wesmec S-Lok® twin ferrule tube fitting is precision engineered to exacting standards. Careful selection of high quality tubing together with the appropriate Wesmec S-Lok® fitting will ensure the installation of safe, leak free systems. The following tables are intended as a guide to tube ordering. The tube sizes listed are regularly tested to bursting pressure in both maximum and |
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| minimum wall thickness using correctly assembled Wesmec S-Lok® tube fittings, with no sign of leakage or failure at the connections. For use with tubes of wall thickness other than those listed, recommendations regarding working pressures for Wesmec S-Lok® fittings can be obtained from our technical department. |
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| Tube should be fully annealed high quality stainless steel tubing to ASTM A-269 or equivalent. The preferred hardness is Rb 80 or less, if harder tube is used Rb 90 is the maximum allowed by ASTM A-269. |
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Recommended maximum working pressures for stainless steel tubes in bar. |
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| Metric |
Outside Diameter
of tube(mm) |
Tube wall thickness (mm) |
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0,5 |
0,7 |
1,0 |
1,5 |
2,0 |
2,5 |
3,0 |
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3
4
6
8
10
12
16
18
20
25 |
450
275
205
170
130
105 |
660
480
310
225
180
150 |
685
515
410
310
245
160
140 |
725
530
490
375
245
230
195
170 |
480
350
335
290
230 |
380
335
265 |
325 |
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| Imperial |
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Outside Diameter
Of tube (inch) |
Tube wall thickness (Swg/inch) |
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33/.010 |
30/.012 |
22/.028 |
20/.036 |
18/.048 |
16/.064 |
14/.080 |
12/.104 |
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1/16
1/8
¼
5/16
3/8
½
5/8
¾
7/8
1 |
385 |
465 |
680
345
265
205
170 |
865
515
315
275
205
155
120
105
85 |
600
465
380
275
205
170
140
120 |
805
635
515
380
275
240
195
170 |
480
380
310
245
225 |
450
380
300
240 |
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The working pressures in the above tables are based on actual tests on ASTM 269 tubing with a safety factor of 4 : 1. They apply to a metal temperature range of -20o to +100o C. |
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| Typical fastening threads : |
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NPT Threads
The National Pipe Taper thread has a thread angle of 60o , and is mainly used in the petrochemical and process industries.
NPT - National Pipe Taper threads for connections where pressure -tight joints are made on the threads utilizing a thread sealant.
Thread Standard
ANSI/ASME B. 20.1-1983 |
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Thread Size |
Thread Per |
E1 |
I1Nominal |
I3 Nominal |
I4 |
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Inch |
inch |
mm |
inch |
mm |
Threads |
inch |
Mm |
inch |
mm |
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1/8
¼
3/8
½
¾
1
1.1/4
1.1/2 |
27
18
18
14
14
11.1/2
11.1/2
11.1/2 |
0.376
0.492
0.627
0.778
0.989
1.239
1.593
1.822 |
9,50
12,50
15,93
19,77
25,12
31,46
40,22
46,29 |
0.161
0.228
0.240
0.320
0.339
0.400
0.420
0.420 |
4,10
5,79
6,10
8,13
8,61
10,16
10,67
10,67 |
3
3
3
3
3
3
3
3
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0.111
0.167
0.167
0.214
0.214
0.261
0.261
0.261 |
2,82
4,23
4,23
5,44
5,44
6,63
6,63
6,63 |
0.392
0.595
0.601
0.782
0.793
0.985
1.009
1.025 |
9,97
15,10
15,26
19,86
20,15
25,01
25,62
26,04 |
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| BSP Threads |
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BSPP and BSP Taper threads have a thread angle of 55o.
The spot face surface must be square to the pitch diameter and free from longitudinal and spiral tool marks. BSPP - British Standard Pipe Parallel threads for tubes and fittings where pressure - tight joints are not made on the thread, i.e. , a peripheral seal is used.
BSP Taper - British Standard Pipe Taper threads for tubes and fittings where pressure- tight joints are made on the threads.
Thread standards
BSPP thread to :
ISO 228-1
BS2779
DIN 3852 part 2
BSP Taper thread to :
ISO 7/1
BS21 |
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BSPP |
BSPT |
Threads per |
D1 Nominal |
A Min |
D4 Max. |
A1 |
S1 |
S2 Min. |
B1 Min. |
B2 |
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inch |
inch |
mm |
inch |
mm |
inch |
mm |
Inch |
Mm |
Inch |
Mm |
inch |
Mm |
inch |
mm |
inch |
Mm |
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1/8
¼
3/8
½
¾
1
1.1/4
1.1/2 |
1/8
¼
3/8
½
¾
1
1.1/4
1.1/2 |
28
19
19
14
14
11
11
11 |
0.383
0.518
0.656
0.825
1.041
1.309
1.650
1.882 |
9,73
13,16
16,66
20,95
26,44
33,25
41,91
47,80 |
0.156
0.237
0.250
0.322
0.375
0.409
0.500
0.500 |
3,97
6,05
6,35
8,16
9,2
10,39
12,7
12,7 |
0.591
0.748
0.906
1.063
1.299
1.575
1.969
2.205 |
15
19
23
27
33
40
50
56 |
0.39
0.059
0.079
0.098
0.098
0.098
0.098
0.098 |
1
1,5
2
2,5
2,5
2,5
2,5
2,5 |
0.375
0.562
0.562
0.750
0.750
0.937
1.0
1.0 |
9,53
14,28
14,28
19,05
19,05
23,80
2,4
25,4 |
0.281
0.437
0.437
0.562
0.625
0.718
0.781
0.875 |
7,14
9,40
9,40
14,28
15,88
18,24
19,84
22,23 |
0.315
0.472
0.437
0.551
0.630
0.709
0.787
0.866 |
8
12
12
14
16
18
20
22 |
0.217
0.335
0.335
0.413
0.512 |
5,5
8,5
8,5
10,5
13 |
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| The sealing of threaded connections : |
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| Interference sealing of taper threads
Pressure-tight joints of screwed connections with taper threads are achieved by the application of a sealant to the surface of the external male thread.
A minimum of five layers of PTFE tape should be wound around the external taper thread prior to the assembly.
Starting with the first thread, wrap the tape in the direction of the thread spiral.
Ensure that the PTFE tape does not overhang the first thread.
PTFE tape should be to the BS4375 specification.
Sealing compounds and liquid sealants.
Apart from polymer joint compounds and air-drying liquid sealants, the most common thread seal is an anaerobic synthetic resin, which cures in the absence of air.
Following assembly and tightening, the curing process is induced by a catalytic reaction between the resin and the metal. Resins that contain PTFE ease disassembly. For applications in food related industries, the thread sealant must be to a specified food-grade.
Connections are normally ready for operation following one hour curing time, complete curing may take up to 24 hours.
Peripheral sealing of parallel threads
Pressure-tight joints of screwed connections with parallel threads are achieved by placing a seal between the two-machined faces.
Flat seals
Washers and rings are manufactured in many different materials including fully annealed 316 stainless steel, copper, aluminum, fiber, and plastics.
The tightening torque at assembly will vary according to the tensile strength of the fitting material, and the elasticity of the peripheral seal. The torque should be carefully selected to avoid compressing soft seals to the point of extrusion.
Bonded seals
Elastomer sealing rings bonded into metal washers. Bonded seals are reusable, and cater for a variation in the quality of the machined surfaces. |
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