S-LOK TUBE FITTINGS AND VALVES

Instrumentation Tube Fittings and Valves have been designed specifically for the many demanding applications of: offshore oil and gas, chemical, petrochemical and Process Instrument, Refinery, Analytical, CNG & GNV, Power Generation, Shipbuilding and Marine Engine, Equipment and Machinery, Semiconductor, Railway Vehicles, and Pharmaceuticals. These fittings are connections for joining tubing, changing directions, reducing line sizes and closing lines of tubing.

MSI is a S-Lok tube fittings distributor, offering tube fittings in brass, stainless steel, along with super duplex and several other special alloys. With tube fitting diameters ranging from 1/8” to 2", MSI can provide the stainless steel tube fittings required for virturally any project.

S-LOK TUBE FITTINGS AND VALVES—MSI Supply, Inc. Get A Quote 


Inventory

MSI Supply can often provide the items listed below for a same-day delivery.  Large quantities, custom sizes, and special alloys (Alloy 20, Monel, Hastelloy, Inconel, Titanium, etc) may be subject to a longer lead time for delivery.

Size Range: 1/8" - 2" 
Fittings:  Union, Tee, 90, Reducer, Male Connector, Female Connector, Bulkhead, Cross
Valves:  Ball, Check, Manifold, Metering, Needle, Plug
Materials:  Stainless, Brass, Carbon Steel, and Exotics
Manufacturers:  S-Lok

 

Ordering Information

There are some need-to-know details when purchasing stainless steel tube fittings, such as: diameter, type/shape, connection type, ferrule system, material, and manufacturer.

MANUFACTURER

MSI Supply is the stocking distributor of S-Lok tube fittings and valves for Houston and the surrounding areas.  S-Lok tube fittings and valves are made in South Korea with raw material fromUSAand the Americas.

S-Lok tube fittings are 100% intermixablewith Swagelok.  S-Lok tube fittings have been tested by TÜV a third-party company which is one of the most reputable testing companies known worldwide. They mixed S-Lok nuts and ferrules and Swagelok nuts and ferrules in a container, then took them out and put them back together to the bodies without knowing the brands, they installed them and tested them and neither one of them presented any leaks. . 

S-Lok tube fittings are also interchangeable with Swagelok.  This means an S-Lok tube fittings can directly replace a Swagelok fitting.

Additionally, S-Lok offers an innovative arrow indicator on all their single and double ferrule nuts. This arrow indicator was designed specifically to avoid the need of marking the nut at 6 o’clock to be used as a point of reference to start the make-up process. 

S-LOK TUBE FITTINGS & END CONNECTION TYPES

There are different tube compression ends and these are listed as follow:

Tube x Tube = Unions

Unions are stainless tube fittings designed to connect fractional or metric tube to another fractional or metric tube, since tubing is not threaded. There are also Reducing Unions, which are stainless tube fittings designed to connect and reduce a tube line.

Union Reducing Union
Union stainless steel tube fitting Reducing Union stainless steel  tube fitting 

 

Tube x Tube through panels = Bulkhead Unions

Bulkhead unions are optimally designed to directly thread through a equipment panel or housing to connect internal tubing to the outside. These bulkhead stainless steel tube fittings are also designed in Tube x Male NPT Thread and Tube x Female NPT Thread.
 
Bulkhead Union Male Bulkhead Female Bulkhead
Bulkhead  Union stainless steel  tube fitting Male Bulkhead stainless steel tube fitting Female Bulkhead stainless steel tube fitting

                              

Tube x Male NPT = Male Connectors

Male Connectors are stainless steel tube fittings designed to connect fractional or metric tube to female NPT thread. 

Male Connector
Male Connector stainless steel tube fitting

 

Tube x Female NPT = Female Connectors 

Female Connectors are stainless steel tube fittings designed to connect fractional or metric tube to male NPT thread.

Female Connector
Female Connector stainless steel tube fitting

 

Tube x Male SAE = Straight Thread Male Connectors

Straight Thread Male Connectors are stainless steel tube fittings designed to connect fractional or metric tubetoaSAEstraight thread boss.

Straight Thread Male Connector
Straight thread male connector stainless steel tube fitting

 

Tube x BSPT = BSPT Male Connectors

BSPT Male Connectors are stainless steel tube fittings designed to connect fractional or metric tube to female ISO taper thread.

BSPT Male Connector
BSPT Male connector stainless steel tube fitting

 

Tube x BSPP = BSPP Male Connectors

BSPP Male Connectors are stainless steel tube fittings designed to connect fractional or metric tube to female ISO parallel thread.

BSPP Male Connector
BSPP Male Connector stainless steel tube fitting

 

Tube x Male NPT Bore Through = Thermocouple Connectors

Thermocouple Connectors are stainless steel tube fittings designed to connect fractional or metric tube female NPT thread. These fittings have no shoulder or sizing angle inside the stainless steel tube fitting, and this feature enables athermocoupleror probe to go through the fitting’s thread end. Thermocouples are used for RTD’s (Resistance Temperature Detectors). 

Thermocouple Connector
thermocouple connector stainless steel tube fitting

 

Tube x Male NPT 90° Pattern = Male Elbows

Male Elbows are stainless steel tube fittings designed to redirect the flow of the media and connect fractional or metric tube to female NPT thread.

Male Elbow
male elbow stainless steel tube fitting

 

Tube x Female NPT 90° Pattern = Female Elbows

Female Elbows are stainless steel tube fitttings designed to redirect the flow of the media and connect fractional or metric tube to male NPT thread.

Female Elbow
female elbow stainless steel tube fitting

 

Tube x Tube Tees = Union Tees

Union Tees are stainless steel tube fittings designed to combine or add a new way in a flow system and connect fractional or metric tube to another fractional or metric tube.

Union Tee
Union tee stainless steel tube fitting

 

Tube x NPT Male Tees = Male Run Tees and Male Branch Tees

Male Run Tees and Male Branch Tees are stainless steel tube fittings designed to connect fractional or metric tube to female NPT thread. These two designs have the same function as the union tees which is to combine or add a new way in a flow system.

Male Run Tee Male Branch Tee
male run tee stainless steel tube fitting male branch tee stainless steel tube fitting

Tube x NPT Female Tees = Female Run Tees and Female Branch Tees

Female Run Tees and Female Branch Tees are stainless steel tube fittings designed to connect fractional or metric tube to female NPT thread. These two designs have the same function as the union tees which is to combine or add a new way in a flow system.

Female Run Tee Female Branch Tee
female run tee stainless steel tube fitting female branch tee stainless steel tube fitting

 

Tube x 37° Male JIC = JIC Male Connectors  

JIC Male Connectors are stainless steel tube fittings designed to connect fractional or metric tube to AN or 37° flared tube.

JIC Male Connector
jic male connector stainless steel tube fitting

 

Tube x Male Pipe Weld = Male Weld Connectors 

Male Weld Connectors are stainless steel tube fittings designed to connect fractional or metric tube to pipe.These weld Male Connectors unlike regular Male Connectors are used to be butt welded and not threaded. 

Male Weld Connectors
male weld connector stainless steel tube fitting

 

Tube x Socket Weld = Socket Weld Male Connectors

Socket Weld Male Connectors are stainless steel tube fittings designed to connectfractionaltube to pipe.These weldMaleConnectors unlike regular Male Connectorsare used to be socket welded and not threaded.

Socket Weld Connectors
socket weld connectors stainless  steel tube fitting

 

S-LOK FERRULE SYSTEMS

There are two different type of stainless steel tube fittings which are Double Ferrule and Single Ferrule and both types of systems perform the same way.  The Double Ferrule system was designed out of necessity for tubing to be connected with an NPT port due to the tubing not being threaded.

For double ferrule stainless steel tube fittings, there are four precision parts: body, nut, front ferrule and back ferrule.  The ferrules are internal metal seals in the tube fitting that bite down the tubing to make a leak free seal connection if installed properly. 

double ferrule stainless steel tube fitting

By screwing the nut onto the body, the nut is tightened against the tapered area of the body and its edge is compressed tightly against the tube by curling inward. The back ferrule is also located between the body and nut. As the front ferrule rolls, the back ferrules roll up and bite into the tubing resulting in the connection of the tube and the stainless steel tube fitting as well as non-leakage effect.

double ferrule stainless steel tube fitting cutaway

The single ferrule stainless steel tube fittings perform the exact same function as the double ferrule but are comprised of only three precision parts: body, nut and one ferrule.  They have the extra advantage to perform better against vibration, tube stick and thermal-cycles issues. 

single ferrule stainless steel tube fitting

S-LOK TUBE FITTINGS MATERIALS

There are different materials for stainless steel tube fittings which are listed as follow:

  • 316
  • 316L
  • Carbon Steel
  • 304
  • Brass
  • Exotics (Super Duplex 2507, Duplex 2205, Monel 400, C276, Alloy 20, Alloy 625, Alloy 825.

S-LOK TUBE FITTINGS ASTM SPECIFICATIONS

Tube fittings can be used with the following tube specifications.

  1. TP304 and TP316 of ASTM A269 or A213, or equivalent.
  2. SUS304TP and SUS316TP of JIS G3459 or equivalent.
  3. The wall thickness selections should be based on the operation pressure, temperature and shock conditions.
  4. Fully Annealed tubing is recommended.
  5. Stainless steel tubing withhardnessof Rockwell B80 or less should be used. 

S-LOK TUBE FITTING INSTALLATION

  1. Cut the tubing to the required length, leaving the ends square to the tube axis, remove all burrs.
  2. Insert thepreparetubing into the tube fitting assembly, ensuring the tube fully enters the fitting and bottoms out and that the nut is finger tight.
  3. For 1/4" – 2” OD size fittings, tighten the nut 1-1/4 turn from finger tight to complete the installation.
  4. For OD sizes below 1/4”, tighten the nut 3/4 of a turn from finger tight to complete the installation. 
stainless steel tube fitting installation

S-LOK FITTINGS AND VALVES CATEGORIES

Single Ferrule System Fittings  Double Ferrule System Fittings
 Single Ferrule System Fittings Double Ferrule System Fittings
Instrumentation Pipe Fittings  Instrumentation Valves
Instrumentation Pipe Fittings Instrumentation Valves

 

S-Lok also offers some additional products as follow:

-         Double Block and Bleed Valves

Double Block and Bleed Valves

-         Monoflanges

Monoflanges

-         3 Way Test Cock Valves

3 Way Test Cock Valves

-         Hydraulic Pipe Fittings

Hydraulic Pipe Fittings

S-Lok CERTIFICATIONS

S-Lok Certifications

S-Lok Certifications