Double Shut-Off
Nominal Diameter
5 = 20 mm²
RECTUS Series
21KB
Chart
Technical Description
Mini industrial coupling, internationally the most common profile for this nominal diameter, in double shut-off design. Above average flow performance for liquid and gaseous media. Large band width in materials and valve variants.

Advantages
Single handed operation. Small dimensions.

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)
depending on the medium.

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

Coupling		 AISI 303 AISI 316L
Back Body
Valve Body
Sleeve
Valve
Spring and Locking Ring
Locking Balls
Seals		 AISI 303
AISI 303
AISI 303
AISI 303
AISI 301
AISI 420
FKM		 AISI 316 L
AISI 316 L
AISI 316 L
AISI 316 L
AISI 316 Ti
AISI 420
FKM
Plug
Plug Profile
Back Body
Valve
Spring
Seal		 AISI 303
AISI 303
AISI 303
AISI 301
FKM		 AISI 316 L
AISI 316 L
AISI 316 L
AISI 316 Ti
FKM

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 AISI 316 L 21KB AW10 EVX
G 1/4 17 38 16 9 AISI 303 21KB AW13 RVX
G 1/4 17 38 16 9 AISI 316 L 21KB AW13 EVX
G 3/8 19 38 16 9 AISI 303 21KB AW17 RVX
G 3/8 19 38 16 9 AISI 316 L 21KB AW17 EVX
Female Thread
Female Thread
 G 1/8 14 36 16 9 AISI 303 21KB IW10 RVX
G 1/8 14 36 16 9 AISI 316 L 21KB IW10 EVX
G 1/4 17 38 16 9 AISI 303 21KB IW13 RVX
G 1/4 17 38 16 9 AISI 316 L 21KB IW13 EVX
G 3/8 19 38 16 9 AISI 303 21KB IW17 RVX
G 3/8 19 38 16 9 AISI 316 L 21KB IW17 EVX
Plastic Hose Connection
Plastic Hose Connection
 4 x 6 mm 14 42 16 7 6 M 10 x 1 AISI 303 21KB KO06 RVX
4 x 6 mm 14 42 16 7 6 M 10 x 1 AISI 316 L 21KB KO06 EVX
6 x 8 mm 14 42 16 7 6 M 12 x 1 AISI 303 21KB KO08 RVX
6 x 8 mm 14 42 16 7 6 M 12 x 1 AISI 316 L 21KB KO08 EVX
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 AISI 303 21KB KS06 RVX
4 x 6 mm 14 54 16 7 18 14 4 M 10 x 1 AISI 316 L 21KB KS06 EVX
6 x 8 mm 17 54 16 7 18 14 4 M 12 x 1 AISI 303 21KB KS08 RVX
                     
Hose Barb
Hose Barb
 4 mm 14 46 16 17 AISI 303 21KB TF04 RVX
4 mm 14 46 16 17 AISI 316 L 21KB TF04 EVX
5 mm 14 46 16 17 AISI 303 21KB TF05 RVX
6 mm 14 46 16 17 AISI 303 21KB TF06 RVX
6 mm 14 46 16 17 AISI 316 L 21KB TF06 EVX
8 mm 14 46 16 17 AISI 303 21KB TF08 RVX
8 mm 14 46 16 17 AISI 316 L 21KB TF08 EVX
9 mm 14 46 16 17 AISI 303 21KB TF09 RVX
9 mm 14 46 16 17 AISI 316 L 21KB TF09 EVX
10 mm 14 46 16 17 AISI 303 21KB TF10 RVX
10 mm 14 46 16 17 AISI 316 L 21KB TF10 EVX
6 mm Parker 14 50 16 20 AISI 303 21KB TP06 RVX
Panel Mount, Hose Barb
Panel Mount, Hose Barb
 8 mm 17 60 16 17 14 17 4 M 12 x 1 AISI 303 21KB TS08 RVX
                     
                     
                     

Valved 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 40 7 AISI 303 21SB AW10 RVX
G 1/8 14 40 7 AISI 316 L 21SB AW10 EVX
G 1/4 17 42 9 AISI 303 21SB AW13 RVX
G 1/4 17 42 9 AISI 316 L 21SB AW13 EVX
G 3/8 19 42 9 AISI 303 21SB AW17 RVX
G 3/8 19 42 9 AISI 316 L 21SB AW17 EVX
M 14 x 1 17 43 10 AISI 303 21SB AM14 RVX
Female Thread
Female Thread
 G 1/8 14 40 9 AISI 303 21SB IW10 RVX
G 1/8 14 40 9 AISI 316 L 21SB IW10 EVX
G 1/4 17 42 9 AISI 303 21SB IW13 RVX
G 1/4 17 42 9 AISI 316 L 21SB IW13 EVX
G 3/8 19 42 9 AISI 303 21SB IW17 RVX
G 3/8 19 42 9 AISI 316 L 21SB IW17 EVX
M 10 x 1 14 40 9 AISI 303 21SB IM10 RVX
M 12 x 1,5 17 42 9 AISI 303 21SB IM12 RVX
M 14 x 1,5 17 42 9 AISI 303 21SB IM14 RVX

Valved Plugs

  Connection A Hex SW L mm D mm L1 mm L2 mm Hex1 SW B mm G mm Version Part Number
Plastic Hose Connection
Plastic Hose Connection
 4 x 6 mm 14 46 7 6 M 10 x 1 AISI 303 21SB KO06 RVX
4 x 6 mm 14 46 7 6 M 10 x 1 AISI 316 L 21SB KO06 EVX
6 x 8 mm 14 46 7 6 M 12 x 1 AISI 303 21SB KO08 RVX
6 x 8 mm 14 46 7 6 M 12 x 1 AISI 316 L 21SB KO08 EVX
Panel Mount, Plastic Hose Connection
Panel Mount, Plastic Hose Connection
 4 x 6 mm 14 58 7 18 12 3 M 10 x 1 AISI 303 21SB KS06 RVX
4 x 6 mm 14 58 7 18 12 3 M 10 x 1 AISI 316 L 21SB KS06 EVX
6 x 8 mm 17 58 7 18 17 4 M 12 x 1 AISI 303 21SB KS08 RVX
                     
Hose Barb
Hose Barb
 6 mm 14 50 17 AISI 303 21SB TF06 RVX
6 mm 14 50 17 AISI 316 L 21SB TF06 EVX
8 mm 14 50 17 AISI 303 21SB TF08 RVX
8 mm 14 50 17 AISI 316 L 21SB TF08 EVX
9 mm 14 50 17 AISI 303 21SB TF09 RVX
9 mm 14 50 17 AISI 316 L 21SB TF09 EVX
10 mm 14 50 17 AISI 303 21SB TF10 RVX
10 mm 14 50 17 AISI 316 L 21SB TF10 EVX
6 mm Parker 14 54 20 AISI 303 21SB TP06 RVX
Panel Mount, Hose Barb
Panel Mount, Hose Barb
 6 mm 17 64 17 14 17 4 M 12 x 1 AISI 303 21SB TS06 RVX
9 mm 17 64 17 14 17 4 M 12 x 1 AISI 303 21SB TS09 RVX
10 mm 17 61 17 11 17 3,5 G 1/4 AISI 303 21SB TS10 RVX