Hansen ST SeriesStraight-Through Couplings
Danfoss Hansen ST Series quick disconnect couplings are designed for applications where minimum pressure drop is required and valving is not needed. The smooth-bore, straight-through design supports free flow of liquid or gas across versatile fluid transfer systems.
Straight-through couplings for low restriction flow
The ST Series uses a ball-latching mechanism and a smooth, valveless bore to support high flow with low restriction. Standard seal material is nitrile (NBR), and standard body materials include brass, steel, and 303 stainless steel depending on the connection style and part family.
- Designed where minimum pressure drop is important and valving is not needed
- Smooth-bore profile supports free flow of liquid or gas
- Available in NPTF, BSPP, and hose stem end connections
Key Features
Ball-Latching Design
The ST Series uses a ball-latching mechanism with a smooth internal bore, making it a strong fit for systems that prioritize easy flow over shutoff valving.
Multiple Material Options
Standard body materials include brass, steel, and 303 stainless steel, giving the series flexibility for general fluid transfer, hydraulic, and washdown-oriented service.
Connection Flexibility
NPTF, BSPP, and hose stem end connections are available across the ST range, along with dust-cap and dust-plug accessories for protected service.
High-flow, low-restriction performance
The ST Series flow data is built around straight-through performance with hydraulic oil at 100°F. Across the family, rated flow ranges from smaller transfer points up through large-bore, high-flow service for demanding liquid and gas movement.
- Catalog-rated flow spans from 10 lpm / 2.7 gpm up to 3,131 lpm / 827 gpm
- Designed specifically where minimum pressure drop is required
- Smooth bore supports unrestricted transfer compared with valved couplings
Common ST applications
- Fluid transfer
- Chemical handling
- Food and beverage systems
- Injection molding
- Marine systems
- Medical equipment
- Pressure washing and steam cleaning
Pressure and flow by series size
| Series | Body Size (in) | Brass Socket & Plug | Brass Socket & Steel Plug | Stainless Socket & Plug | Group 1 Fluids & Gases | Min. Burst | Rated Flow |
|---|---|---|---|---|---|---|---|
| 1ST | 1/8 | 193 bar / 2,800 psi | 234 bar / 3,400 psi | 290 bar / 4,200 psi | – | 772 bar / 11,200 psi | 10 lpm / 2.7 gpm |
| 2ST | 1/4 | 359 bar / 5,200 psi | 379 bar / 5,500 psi | 517 bar / 7,500 psi | – | 1,436 bar / 20,800 psi | 21 lpm / 5.6 gpm |
| 3ST | 3/8 | 193 bar / 2,800 psi | 290 bar / 4,200 psi | 434 bar / 6,300 psi | – | 772 bar / 11,200 psi | 57 lpm / 15 gpm |
| 4ST | 1/2 | 152 bar / 2,200 psi | 241 bar / 3,500 psi | 248 bar / 3,600 psi | – | 608 bar / 8,800 psi | 83 lpm / 22 gpm |
| 6ST | 3/4 | 117 bar / 1,700 psi | 145 bar / 2,100 psi | 207 bar / 3,000 psi | – | 468 bar / 6,800 psi | 250 lpm / 66 gpm |
| 8ST | 1 | 90 bar / 1,300 psi | 138 bar / 2,000 psi | 138 bar / 2,000 psi | – | 360 bar / 5,200 psi | 530 lpm / 140 gpm |
| 10ST | 1-1/4 | 117 bar / 1,700 psi | 186 bar / 2,700 psi | 152 bar / 2,200 psi | – | 468 bar / 6,800 psi | 697 lpm / 184 gpm |
| 12ST | 1-1/2 | 97 bar / 1,400 psi | 152 bar / 2,200 psi | 172 bar / 2,500 psi | 33 bar / 480 psi | 388 bar / 5,600 psi | 1,124 lpm / 297 gpm |
| 16ST | 2 | 97 bar / 1,400 psi | 152 bar / 2,200 psi | 103 bar / 1,500 psi | 27 bar / 390 psi | 388 bar / 5,600 psi | 1,855 lpm / 490 gpm |
| 20ST | 2-1/2 | 62 bar / 900 psi | 103 bar / 1,500 psi | – | 20 bar / 290 psi | 248 bar / 3,600 psi | 3,131 lpm / 827 gpm |
Couplings up to and including 25 mm nominal diameter are designed under Article 4.3 of PED 2014/68/EU. Larger nominal diameters follow Module A requirements and should not be used to convey unstable gases.
Male Pipe Thread Socket Dimensions
Male End Connections – Socket/Female
| Brass | Steel | Stainless Steel | Coupling Type | Body Size | Port Size | Thread Type | Fig. | A | B | Hex |
|---|
Female Pipe Thread Socket Dimensions
Female End Connections – Socket/Female
| Brass | Steel | Stainless Steel | Coupling Type | Body Size | Port Size | Thread Size / Type | Fig. | A | B | Hex |
|---|
*With Steel Sleeve
Hose Stem Socket Dimensions
Hose Stem End Connections – Socket/Female
| Brass | Steel | Stainless Steel | Coupling Type | Body Size | Hose I.D. | Fig. | A | B |
|---|
Male Pipe Thread Plug Dimensions
Male End Connections – Plug/Male
| Brass | Steel | Stainless Steel | Coupling Type | Body Size | Port Size | Thread Size / Type | Fig. | C | D | Hex |
|---|
**High impulse heat treated 416 stainless steel
Female Pipe Thread Plug Dimensions
Female End Connections – Plug/Male
| Brass | Steel | Stainless Steel | Coupling Type | Body Size | Port Size | Thread Size / Type | Fig. | C | D | Hex |
|---|
**High impulse heat treated 416 stainless steel
Hose Stem Plug Dimensions
Hose Stem End Connections – Plug/Male
| Brass | Steel | Stainless | Type | Hose I.D. | Fig. | C | D |
|---|---|---|---|---|---|---|---|
| B1T12 | – | LL1T12 | Plug/Male | 3/16 Hose I.D. | 2 | 1.28 | 0.44 |
| B1T17 | – | LL1T17 | Plug/Male | 1/4 Hose I.D. | 2 | 1.28 | 0.44 |
| B2T17 | – | LL2T17 | Plug/Male | 1/4 Hose I.D. | 2 | 1.93 | 0.56 |
| B3T22 | – | LL3T22 | Plug/Male | 3/8 Hose I.D. | 2 | 2.09 | 0.69 |
| B4T27 | – | LL4T27 | Plug/Male | 1/2 Hose I.D. | 2 | 2.17 | 0.88 |
| B6T32 | – | LL6T32 | Plug/Male | 3/4 Hose I.D. | 2 | 3.17 | 1.19 |
| B8T37 | 8T37 | – | Plug/Male | 1 Hose I.D. | 2 | 3.28 | 1.50 |
Dust Caps and Dust Plugs
Notes: HL-series stainless entries indicate high-impulse heat-treated 416 stainless alternatives where shown. 10S41 / 12S46 / 16S51 include steel sleeve variants as called out in the catalog.
Need help with an ST Series part number?
If you are matching an existing ST fitting or need help choosing between brass, steel, or 303 stainless options, send us the part number or connection details and we can help narrow the right configuration.
Request Pricing & Availability