Single Shut-Off
Nominal Diameter
5 = 20 mm²
RECTUS Series
21KS
Chart
Technical Description
Mini industrial coupling, the world‘s most commonly used profile. Above average flow performance for liquid and gaseous media. It also uses an additional safety locking system. This prevents unintentional disconnection. When being disconnected, the plug must first be pushed further into the coupling before it can be disconnected.

Advantages
Small dimensions. The safety locking system prevents unauthorized disconnection.

Working Pressure
PB = 35 bar,
maximum static working pressure with safety factor of 4 to 1.

Working Temperature*
-20°C up to +100°C (NBR)
-40°C up to +120/150°C (EPDM)
-15°C up to +200°C (FKM)
0°C up to +316°C (FFKM)
depending on the medium.

*At a temperature below -20°C and above +100°C special seals are available on request.
Material

Coupling		 Standard Nickel Plated
Back Body
Valve Body
Sleeve
Valve
Spring and Locking Ring
Locking Balls
Seals		 Brass
Brass
Brass
Brass
AISI 301
AISI 420
NBR		 Brass, Nickel Plated
Brass, Nickel Plated
Brass, Nickel Plated
Brass
AISI 301
AISI 420
NBR
Plug
Plug Brass Brass, Nickel Plated

Couplings

  Connection A Hex SW L mm D mm L1 mm L2 mm Hex1 SW B mm G mm Version Part Number
Male Thread
Male Thread
 G 1/8 14 36 16 7 Standard 21KSAW10MPX
G 1/8 14 36 16 7 Nickel Plated 21KSAW10MPN
G 1/4 17 38 16 9 Standard 21KSAW13MPX
G 1/4 17 38 16 9 Nickel Plated 21KSAW13MPN
G 3/8 19 38 16 9 Standard 21KSAW17MPX
G 3/8 19 38 16 9 Nickel Plated 21KSAW17MPN
M 12 x 1,5 17 39 16 10 Standard 21KSAD12MPX
M 12 x 1,5 17 39 16 10 Nickel Plated 21KSAD12MPN
M 14 x 1,5 17 39 16 10 Standard 21KSAD14MPX
M 14 x 1,5 17 39 16 10 Nickel Plated 21KSAD14MPN
Female Thread
Female Thread
 G 1/8 14 36 16 9 Standard 21KSIW10MPX
G 1/8 14 36 16 9 Nickel Plated 21KSIW10MPN
G 1/4 17 38 16 9 Standard 21KSIW13MPX
G 1/4 17 38 16 9 Nickel Plated 21KSIW13MPN
G 3/8 19 38 16 6 Standard 21KSIW17MPX
G 3/8 19 38 16 6 Nickel Plated 21KSIW17MPN
M 12 x 1,5 17 38 16 6 Standard 21KSIM12MPX
M 12 x 1,5 17 38 16 6 Nickel Plated 21KSIM12MPN
M 14 x 1,5 17 38 16 6 Standard 21KSIM14MPX
M 14 x 1,5 17 38 16 6 Nickel Plated 21KSIM14MPN
Hose Barb
Hose Barb
 4 mm 14 46 16 17 Standard 21KSTF04MPX
4 mm 14 46 16 17 Nickel Plated 21KSTF04MPN
5 mm 14 46 16 17 Standard 21KSTF05MPX
5 mm 14 46 16 17 Nickel Plated 21KSTF05MPN
6 mm 14 46 16 17 Standard 21KSTF06MPX
6 mm 14 46 16 17 Nickel Plated 21KSTF06MPN
8 mm 14 46 16 17 Standard 21KSTF08MPX
8 mm 14 46 16 17 Nickel Plated 21KSTF08MPN
9 mm 14 46 16 17 Standard 21KSTF09MPX
9 mm 14 46 16 17 Nickel Plated 21KSTF09MPN
10 mm 14 46 16 17 Standard 21KSTF10MPX
10 mm 14 46 16 17 Nickel Plated 21KSTF10MPN
Plastic Hose Connection
Plastic Hose Connection
 4 x 6 mm 14 42 16 7 6 M 10 x 1 Standard 21KSKO06MPX
4 x 6 mm 14 42 16 7 6 M 10 x 1 Nickel Plated 21KSKO06MPN
6 x 8 mm 14 42 16 7 6 M 12 x 1 Standard 21KSKO08MPX
6 x 8 mm 14 42 16 7 6 M 12 x 1 Nickel Plated 21KSKO08MPN
Panel Mount, Plastic Hose Connection
Panel Mount, Plastic Hose Connection
 4 x 6 mm 14 54 16 7 18 14 4 M 10 x 1 Standard 21KSKS06MPX
4 x 6 mm 14 54 16 7 18 14 4 M 10 x 1 Nickel Plated 21KSKS06MPN
6 x 8 mm 17 54 16 7 18 17 4 M 12 x 1 Standard 21KSKS08MPX
6 x 8 mm 17 54 16 7 18 17 4 M 12 x 1 Nickel Plated 21KSKS08MPN
Panel Mount, Hose Barb
Panel Mount, Hose Barb
 4 mm 14 60 16 17 14 14 4 M 10 x 1 Standard 21KSTS04MPX
4 mm 14 60 16 17 14 14 4 M 10 x 1 Nickel Plated 21KSTS04MPN
5 mm 17 60 16 17 14 17 4 M 12 x 1 Standard 21KSTS05MPX
5 mm 17 60 16 17 14 17 4 M 12 x 1 Nickel Plated 21KSTS05MPN
6 mm 17 60 16 17 14 17 4 M 12 x 1 Standard 21KSTS06MPX

Plugs

  Connection A Hex SW L mm D mm L1 mm L2 mm Hex1 SW B mm G mm Version Part Number
Male Thread
Male Thread
 G 1/8 14 25 7 Standard 21SSAW10MXX
G 1/8 14 25 7 Nickel Plated 21SSAW10MXN
G 1/4 17 28 9 Standard 21SSAW13MXX
G 1/4 17 28 9 Nickel Plated 21SSAW13MXN
Female Thread
Female Thread
 G 1/8 14 25 8 Standard 21SSIW10MXX
G 1/8 14 25 8 Nickel Plated 21SSIW10MXN
G 1/4 17 25 9 Standard 21SSIW13MXX
G 1/4 17 25 9 Nickel Plated 21SSIW13MXN

Plugs

  Connection A Hex SW L mm D mm L1 mm L2 mm Hex1 SW B mm G mm Version Part Number
Hose Barb
Hose Barb
 4 mm 32 9 17 Standard 21SSTF04MXX
4 mm 32 9 17 Nickel Plated 21SSTF04MXN
6 mm 32 9 17 Standard 21SSTF06MXX
6 mm 32 9 17 Nickel Plated 21SSTF06MXN
8 mm 32 9 17 Standard 21SSTF08MXX
8 mm 32 9 17 Nickel Plated 21SSTF08MXN
9 mm 33 10 17 Standard 21SSTF09MXX
9 mm 33 10 17 Nickel Plated 21SSTF09MXN
10 mm 33 12 17 Standard 21SSTF10MXX
10 mm 33 12 17 Nickel Plated 21SSTF10MXN