Single Shut-Off
Nominal Diameter
5 = 20 mm²
RECTUS Series
21KA
Chart
Technical Description
The 21 KA series is a small, single hand operated quick connect coupling with high air flow. This series has excellent capabilities wherever space plays a major role. The 21 series provides an excellent solution for the connecting of different media with the inherent danger of making the wrong connection. Four standard codes with matching colors for the coupling and the respective plugs make sure there is no mix-up of the media when connecting. Double shut-off and straight through couplings are available on request.

Advantages
A quality coupling with small dimensions. Single handed operation, high flow rate for its size. Multiple connection options. Cannot be interconnected with the standard 21 series.

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)
Material

Coupling		 Standard Brass, Nickel Pl.
Back Body
Valve Body
Sleeve
Valve
Spring and Locking Ring
Locking Balls
Seals		 Brass
Brass
Aluminium, elox.
Brass
AISI 301
AISI 420
NBR		 Brass, Nickel Plated
Brass, Nickel Plated
Aluminium, elox.
Brass
AISI 301
AISI 420
NBR
Plug
Brass with
annodized alu-
minium designation

see Part Number
MPX, MXX		 Brass, Nickel Plated
with annodized alu-
minium designation

see Part Number
MPN, MXN

Couplings

  Connection A Hex SW L mm D mm L1 mm L2 mm Hex1 SW B mm G mm Color Version Part Number
Male Thread
Male Thread
 G 1/8 14 47 16 7 green Standard 21KAAW10MPX0
G 1/8 14 47 16 7 brown Standard 21KA AW10 MPX3
G 1/8 14 47 16 7 blue Standard 21KA AW10 MPX6
G 1/8 14 47 16 7 red Standard 21KA AW10 MPX8
G 1/8 14 47 16 7 green Nickel Plated 21KA AW10 MPN0
G 1/8 14 47 16 7 brown Nickel Plated 21KA AW10 MPN3
G 1/8 14 47 16 7 blue Nickel Plated 21KA AW10 MPN6
G 1/8 14 47 16 7 red Nickel Plated 21KA AW10 MPN8
G 1/4 17 47 16 9 green Standard 21KA AW13 MPX0
G 1/4 17 47 16 9 brown Standard 21KA AW13 MPX3
G 1/4 17 47 16 9 blue Standard 21KA AW13 MPX6
G 1/4 17 47 16 9 red Standard 21KA AW13 MPX8
G 1/4 17 47 16 9 green Nickel Plated 21KA AW13 MPN0
G 1/4 17 47 16 9 brown Nickel Plated 21KA AW13 MPN3
G 1/4 17 47 16 9 blue Nickel Plated 21KA AW13 MPN6
G 1/4 17 47 16 9 red Nickel Plated 21KA AW13 MPN8
Female Thread
Female Thread
 G 1/8 14 47 16 7 green Standard 21KA IW10 MPX0
G 1/8 14 47 16 7 brown Standard 21KA IW10 MPX3
G 1/8 14 47 16 7 blue Standard 21KA IW10 MPX6
G 1/8 14 47 16 7 red Standard 21KA IW10 MPX8
G 1/8 14 47 16 7 green Nickel Plated 21KA IW10 MPN0
G 1/8 14 47 16 7 brown Nickel Plated 21KA IW10 MPN3
G 1/8 14 47 16 7 blue Nickel Plated 21KA IW10 MPN6
G 1/8 14 47 16 7 red Nickel Plated 21KA IW10 MPN8
G 1/4 17 47 16 9 green Standard 21KA IW13 MPX0
G 1/4 17 47 16 9 brown Standard 21KA IW13 MPX3
G 1/4 17 47 16 9 blue Standard 21KA IW13 MPX6
G 1/4 17 47 16 9 red Standard 21KA IW13 MPX8
G 1/4 17 47 16 9 green Nickel Plated 21KA IW13 MPN0
G 1/4 17 47 16 9 brown Nickel Plated 21KA IW13 MPN3
G 1/4 17 47 16 9 blue Nickel Plated 21KA IW13 MPN6
G 1/4 17 47 16 9 red Nickel Plated 21KA IW13 MPN8
Plastic Hose Connection
Plastic Hose Connection
 4x6 mm 14 51 16 7 6 M10 x 1 green Standard 21KA KO06 MPX0
4x6 mm 14 51 16 7 6 M 10 x 1 brown Standard 21KA KO06 MPX3
4x6 mm 14 51 16 7 6 M 10 x 1 blue Standard 21KA KO06 MPX6
4x6 mm 14 51 16 7 6 M 10 x 1 red Standard 21KA KO06 MPX8
4x6 mm 14 51 16 7 6 M 10 x 1 green Nickel Plated 21KA KO06 MPN0
4x6 mm 14 51 16 7 6 M 10 x 1 brown Nickel Plated 21KA KO06 MPN3
4x6 mm 14 51 16 7 6 M 10 x 1 blue Nickel Plated 21KA KO06 MPN6
4x6 mm 14 51 16 7 6 M 10 x 1 red Nickel Plated 21KA KO06 MPN8
6x8 mm 14 51 16 7 6 M 12 x 1 green Standard 21KA KO08 MPX0
6x8 mm 14 51 16 7 6 M 12 x 1 brown Standard 21KA KO08 MPX3
6x8 mm 14 51 16 7 6 M 12 x 1 blue Standard 21KA KO08 MPX6
6x8 mm 14 51 16 7 6 M 12 x 1 red Standard 21KA KO08 MPX8
6x8 mm 14 51 16 7 6 M 12 x 1 green Nickel Plated 21KA KO08 MPN0
6x8 mm 14 51 16 7 6 M 12 x 1 brown Nickel Plated 21KA KO08 MPN3
6x8 mm 14 51 16 7 6 M 12 x 1 blue Nickel Plated 21KA KO08 MPN6
6x8 mm 14 51 16 7 6 M 12 x 1 red Nickel Plated 21KA KO08 MPN8
Hose Barb
Hose Barb
 4 mm 14 69 16 17 green Standard 21KA TF04 MPX0
4 mm 14 69 16 17 brown Standard 21KA TF04 MPX3
4 mm 14 69 16 17 blue Standard 21KA TF04 MPX6
4 mm 14 69 16 17 red Standard 21KA TF04 MPX8
4 mm 14 69 16 17 green Nickel Plated 21KA TF04 MPN0
4 mm 14 69 16 17 brown Nickel Plated 21KA TF04 MPN3
4 mm 14 69 16 17 blue Nickel Plated 21KA TF04 MPN6
4 mm 14 69 16 17 red Nickel Plated 21KA TF04 MPN8
6 mm 14 69 16 17 green Standard 21KA TF06 MPX0
6 mm 14 69 16 17 brown Standard 21KA TF06 MPX3
6 mm 14 69 16 17 blue Standard 21KA TF06 MPX6
6 mm 14 69 16 17 red Standard 21KA TF06 MPX8
6 mm 14 69 16 17 green Nickel Plated 21KA TF06 MPN0
6 mm 14 69 16 17 brown Nickel Plated 21KA TF06 MPN3
6 mm 14 69 16 17 blue Nickel Plated 21KA TF06 MPN6
6 mm 14 69 16 17 red Nickel Plated 21KA TF06 MPN8
8 mm 14 69 16 17 green Standard 21KA TF08 MPX0
8 mm 14 69 16 17 brown Standard 21KA TF08 MPX3
8 mm 14 69 16 17 blue Standard 21KA TF08 MPX6
8 mm 14 69 16 17 red Standard 21KA TF08 MPX8
8 mm 14 69 16 17 green Nickel Plated 21KA TF08 MPN0
8 mm 14 69 16 17 brown Nickel Plated 21KA TF08 MPN3
8 mm 14 69 16 17 blue Nickel Plated 21KA TF08 MPN6
8 mm 14 69 16 17 red Nickel Plated 21KA TF08 MPN8
9 mm 14 69 16 17 green Standard 21KA TF09 MPX0
9 mm 14 69 16 17 brown Standard 21KA TF09 MPX3
9 mm 14 69 16 17 blue Standard 21KA TF09 MPX6
9 mm 14 69 16 17 red Standard 21KA TF09 MPX8
9 mm 14 69 16 17 green Nickel Plated 21KA TF09 MPN0
9 mm 14 69 16 17 brown Nickel Plated 21KA TF09 MPN3
9 mm 14 69 16 17 blue Nickel Plated 21KA TF09 MPN6
9 mm 14 69 16 17 red Nickel Plated 21KA TF09 MPN8
10 mm 14 69 16 17 green Standard 21KA TF10 MPX0
10 mm 14 69 16 17 brown Standard 21KA TF10 MPX3
10 mm 14 69 16 17 blue Standard 21KA TF10 MPX6
10 mm 14 69 16 17 red Standard 21KA TF010MPX8
10 mm 14 69 16 17 green Nickel Plated 21KA TF10 MPN0
10 mm 14 69 16 17 brown Nickel Plated 21KA TF10 MPN3
10 mm 14 69 16 17 blue Nickel Plated 21KA TF10 MPN6
10 mm 14 69 16 17 red Nickel Plated 21KA TF10 MPN8
Bulkhead Fitting for Hose Barb
Bulkhead Fitting for Hose Barb
 4 mm 14 69 16 14 17 4 M 10 x 1 green Standard 21KA TS04 MPX0
4 mm 14 69 16 14 17 4 M 10 x 1 brown Standard 21KA TS04 MPX3
4 mm 14 69 16 14 17 4 M 10 x 1 blue Standard 21KA TS04 MPX6
4 mm 14 69 16 14 17 4 M 10 x 1 red Standard 21KA TS04 MPX8
4 mm 14 69 16 14 17 4 M 10 x 1 green Nickel Plated 21KA TS04 MPN0
4 mm 14 69 16 14 17 4 M 10 x 1 brown Nickel Plated 21KA TS04 MPN3
4 mm 14 69 16 14 17 4 M 10 x 1 blue Nickel Plated 21KA TS04 MPN6
4 mm 14 69 16 14 17 4 M 10 x 1 red Nickel Plated 21KA TS04 MPN8
5 mm 14 69 16 14 17 4 M 12 x 1 green Standard 21KA TS05 MPX0
5 mm 14 69 16 14 17 4 M 12 x 1 brown Standard 21KA TS05 MPX3
5 mm 14 69 16 14 17 4 M 12 x 1 blue Standard 21KA TS05 MPX6
5 mm 14 69 16 14 17 4 M 12 x 1 red Standard 21KA TS05 MPX8
5 mm 14 69 16 14 17 4 M 12 x 1 green Nickel Plated 21KA TS05 MPN0
5 mm 14 69 16 14 17 4 M 12 x 1 brown Nickel Plated 21KA TS05 MPN3
5 mm 14 69 16 14 17 4 M 12 x 1 blue Nickel Plated 21KA TS05 MPN6
5 mm 14 69 16 14 17 4 M 12 x 1 red Nickel Plated 21KA TS05 MPN8
6 mm 14 69 16 14 17 4 M 12 x 1 green Standard 21KA TS06 MPX0
6 mm 14 69 16 14 17 4 M 12 x 1 brown Standard 21KA TS06 MPX3
6 mm 14 69 16 14 17 4 M 12 x 1 blue Standard 21KA TS06 MPX6
6 mm 14 69 16 14 17 4 M 12 x 1 red Standard 21KA TS06 MPX8
6 mm 14 69 16 14 17 4 M 12 x 1 green Nickel Plated 21KA TS06 MPN0
6 mm 14 69 16 14 17 4 M 12 x 1 brown Nickel Plated 21KA TS06 MPN3
6 mm 14 69 16 14 17 4 M 12 x 1 blue Nickel Plated 21KA TS06 MPN6
6 mm 14 69 16 14 17 4 M 12 x 1 red Nickel Plated 21KA TS06 MPN8
8 mm 14 69 16 14 17 4 M 12 x 1 green Standard 21KA TS08 MPX0
8 mm 14 69 16 14 17 4 M 12 x 1 brown Standard 21KA TS08 MPX3
8 mm 14 69 16 14 17 4 M 12 x 1 blue Standard 21KA TS08 MPX6
8 mm 14 69 16 14 17 4 M 12 x 1 red Standard 21KA TS08 MPX8
8 mm 14 69 16 14 17 4 M 12 x 1 green Nickel Plated 21KA TS08 MPN0
8 mm 14 69 16 14 17 4 M 12 x 1 brown Nickel Plated 21KA TS08 MPN3
8 mm 14 69 16 14 17 4 M 12 x 1 blue Nickel Plated 21KA TS08 MPN6
8 mm 14 69 16 14 17 4 M 12 x 1 red Nickel Plated 21KA TS08 MPN8

Plugs

  Connection A Hex SW L mm D mm L1 mm L2 mm Hex1 SW B mm G mm Color Version Part Number
Plastic Hose Connection
Plastic Hose Connection
 4x6 mm 43 15 7 6 M 10 x 1 green Standard 21SF KO06 MXX0
4x6 mm 43 15 7 6 M 10 x 1 brown Standard 21SF KO06 MXX3
4x6 mm 43 15 7 6 M 10 x 1 blue Standard 21SF KO06 MXX6
4x6 mm 43 15 7 6 M 10 x 1 red Standard 21SF KO06 MXX8
4x6 mm 43 15 7 6 M 10 x 1 green Nickel Plated 21SF KO06 MXN0
4x6 mm 43 15 7 6 M 10 x 1 brown Nickel Plated 21SF KO06 MXN3
4x6 mm 43 15 7 6 M 10 x 1 blue Nickel Plated 21SF KO06 MXN6
4x6 mm 43 15 7 6 M 10 x 1 red Nickel Plated 21SF KO06 MXN8
6x8 mm 43,5 15 7 6 M 12 x 1 green Standard 21SF KO08 MXX0
6x8 mm 43,5 15 7 6 M 12 x 1 brown Standard 21SF KO08 MXX3
6x8 mm 43,5 15 7 6 M 12 x 1 blue Standard 21SF KO08 MXX6
6x8 mm 43,5 15 7 6 M 12 x 1 red Standard 21SF KO08 MXX8
6x8 mm 43,5 15 7 6 M 12 x 1 green Nickel Plated 21SF KO08 MXN0
6x8 mm 43,5 15 7 6 M 12 x 1 brown Nickel Plated 21SF KO08 MXN3
6x8 mm 43,5 15 7 6 M 12 x 1 blue Nickel Plated 21SF KO08 MXN6
6x8 mm 43,5 15 7 6 M 12 x 1 red Nickel Plated 21SF KO08 MXN8
Hose Barb
Hose Barb
 4 mm 47 15 17 green Standard 21SF TF04 MXX0
4 mm 47 15 17 brown Standard 21SF TF04 MXX3
4 mm 47 15 17 blue Standard 21SF TF04 MXX6
4 mm 47 15 17 red Standard 21SF TF04 MXX8
4 mm 47 15 17 green Nickel Plated 21SF TF04 MXN0
4 mm 47 15 17 brown Nickel Plated 21SF TF04 MXN3
4 mm 47 15 17 blue Nickel Plated 21SF TF04 MXN6
4 mm 47 15 17 red Nickel Plated 21SF TF04 MXN8
6 mm 47 15 17 green Standard 21SF TF06 MXX0
6 mm 47 15 17 brown Standard 21SF TF06 MXX3
6 mm 47 15 17 blue Standard 21SF TF06 MXX6
6 mm 47 15 17 red Standard 21SF TF06 MXX8
6 mm 47 15 17 green Nickel Plated 21SF TF06 MXN0
6 mm 47 15 17 brown Nickel Plated 21SF TF06 MXN3
6 mm 47 15 17 blue Nickel Plated 21SF TF06 MXN6
6 mm 47 15 17 red Nickel Plated 21SF TF06 MXN8
Bulkhead Fitting for Hose Barb
Bulkhead Fitting for Hose Barb
 4 mm 17 63 17 14 4 M 10 x 1 green Standard 21SF TS04 MXX0
4 mm 17 63 17 14 4 M 10 x 1 brown Standard 21SF TS04 MXX3
4 mm 17 63 17 14 4 M 10 x 1 blue Standard 21SF TS04 MXX6
4 mm 17 63 17 14 4 M 10 x 1 red Standard 21SF TS04 MXX8
4 mm 17 63 17 14 4 M 10 x 1 green Nickel Plated 21SF TS04 MXN0
4 mm 17 63 17 14 4 M 10 x 1 brown Nickel Plated 21SF TS04 MXN3
4 mm 17 63 17 14 4 M 10 x 1 blue Nickel Plated 21SF TS04 MXN6
4 mm 17 63 17 14 4 M 10 x 1 red Nickel Plated 21SF TS04 MXN8
6 mm 17 63 17 14 4 M 12 x 1 green Standard 21SF TS06 MXX0
6 mm 17 63 17 14 4 M 12 x 1 brown Standard 21SF TS06 MXX3
6 mm 17 63 17 14 4 M 12 x 1 blue Standard 21SF TS06 MXX6
6 mm 17 63 17 14 4 M 12 x 1 red Standard 21SF TS06 MXX8
6 mm 17 63 17 14 4 M 12 x 1 green Nickel Plated 21SF TS06 MXN0
6 mm 17 63 17 14 4 M 12 x 1 brown Nickel Plated 21SF TS06 MXN3
6 mm 17 63 17 14 4 M 12 x 1 blue Nickel Plated 21SF TS06 MXN6
6 mm 17 63 17 14 4 M 12 x 1 red Nickel Plated 21SF TS06 MXN8

Plugs

  Connection A Hex SW L mm D mm L1 mm L2 mm Hex1 SW B mm G mm Color Version Part Number
Male Thread
Male Thread
 G 1/8 17 39,5 7 green Standard 21SF AW10 MXX0
G 1/8 17 39,5 7 brown Standard 21SF AW10 MXX3
G 1/8 17 39,5 7 blue Standard 21SF AW10 MXX6
G 1/8 17 39,5 7 red Standard 21SF AW10 MXX8
G 1/8 17 39,5 7 green Nickel Plated 21SF AW10 MXN0
G 1/8 17 39,5 7 brown Nickel Plated 21SF AW10 MXN3
G 1/8 17 39,5 7 blue Nickel Plated 21SF AW10 MXN6
G 1/8 17 39,5 7 red Nickel Plated 21SF AW10 MXN8
G 1/4 17 41,5 9 green Standard 21SF AW13 MXX0
G 1/4 17 41,5 9 brown Standard 21SF AW13 MXX3
G 1/4 17 41,5 9 blue Standard 21SF AW13 MXX6
G 1/4 17 41,5 9 red Standard 21SF AW13 MXX8
G 1/4 17 41,5 9 green Nickel Plated 21SF AW13 MXN0
G 1/4 17 41,5 9 brown Nickel Plated 21SF AW13 MXN3
G 1/4 17 41,5 9 blue Nickel Plated 21SF AW13 MXN6
G 1/4 17 41,5 9 red Nickel Plated 21SF AW13 MXN8
Female Thread
Female Thread
 G 1/8 17 38,5 5 green Standard 21SF IW10 MXX0
G 1/8 17 38,5 5 brown Standard 21SF IW10 MXX3
G 1/8 17 38,5 5 blue Standard 21SF IW10 MXX6
G 1/8 17 38,5 5 red Standard 21SF IW10 MXX8
G 1/8 17 38,5 5 green Nickel Plated 21SF IW10 MXN0
G 1/8 17 38,5 5 brown Nickel Plated 21SF IW10 MXN3
G 1/8 17 38,5 5 blue Nickel Plated 21SF IW10 MXN6
G 1/8 17 38,5 5 red Nickel Plated 21SF IW10 MXN8
G 1/4 17 39 7 green Standard 21SF IW13 MXX0
G 1/4 17 39 7 brown Standard 21SF IW13 MXX3
G 1/4 17 39 7 blue Standard 21SF IW13 MXX6
G 1/4 17 39 7 red Standard 21SF IW13 MXX8
G 1/4 17 39 7 green Nickel Plated 21SF IW13 MXN0
G 1/4 17 39 7 brown Nickel Plated 21SF IW13 MXN3
G 1/4 17 39 7 blue Nickel Plated 21SF IW13 MXN6
G 1/4 17 39 7 red Nickel Plated 21SF IW13 MXN8