Coupling heads and Overrun devices
Coupling heads and coupling units, sometimes also called overrun devices are all vital accessories when it commes to attaching the trailer onto your vehicle in a safe manner. At our online store, you will find plenty of coupling heads and coupling units, which have been produced by renowned manufacturers such as AL-KO, KNOTT, WINTERHOFF and STEELPRESS. The accessories in question boast a GVW values ranging between 700 and 3500 and are available at very affordable prices. If you want to travel risk-free with your trailer, simply get your hands on a coupling unit today and save yourself from all the hassle.
![Coupling head for trailers Winterhoff WW 8-E GVW 800 kg](https://static2.unitrailer.co.uk/hpeciai/535d4e45cc93dad49b62a04941b1804f/pol_il_34-34.png)
Coupling head for trailers Winterhoff WW 8-E GVW 800 kg
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£10.491049 PTS
- Catalog number:
- GVW:
- Material:
![KNOTT trailer tow ball coupling KS30 3000 kg fi 35/40/45/50 mm](https://static3.unitrailer.co.uk/hpeciai/a5432859da7d6a57fba932154e9b76b4/pol_il_3429-3429.jpg)
KNOTT trailer tow ball coupling KS30 3000 kg fi 35/40/45/50 mm
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£288.9928899 PTS
- Model:
- GVW:
- Nose load:
- Reference:
![Coupling head for trailers Winterhoff WW 8 - GVW 800 kg](https://static2.unitrailer.co.uk/hpeciai/48a73656d63ffe4747ab0705770cbfb0/pol_il_585-585.png)
Coupling head for trailers Winterhoff WW 8 - GVW 800 kg
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£10.491049 PTS
- Catalog number:
- GVW:
- Material:
![Ball coupling for trailers WW 8-Y Winterhoff](https://static1.unitrailer.co.uk/hpeciai/70d4a9698ccb24fd6a560ac434384e8d/pol_il_12-12.png)
Ball coupling for trailers WW 8-Y Winterhoff
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£12.991299 PTS
- Catalog number:
- GVW:
- Material:
- Nose load:
![Coupling head for trailers Winterhoff WW 8 - A DMC 800 kg](https://static3.unitrailer.co.uk/hpeciai/2b9672d271a0d400990174a9c39b69af/pol_il_221-221.png)
Coupling head for trailers Winterhoff WW 8 - A DMC 800 kg
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£10.491049 PTS
- Catalog number:
- GVW:
- Material:
![Coupling head for trailers AL-KO AK7 750 kg 60 mm](https://static3.unitrailer.co.uk/hpeciai/d4f4e3c4250c34ec6744ba312c298746/pol_il_133-133.png)
Coupling head for trailers AL-KO AK7 750 kg 60 mm
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£11.491149 PTS
- Catalog number:
- Diameter of mounting holes:
- GVW:
![Bellow for overrun device AL-KO 161S/251S/251G FI50](https://static2.unitrailer.co.uk/hpeciai/d9cfa8e15788f4beb21416a76d19cecb/pol_il_1229-1229.jpg)
Bellow for overrun device AL-KO 161S/251S/251G FI50
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£6.99699 PTS
- Reference:
![Overrun device for trailers AL-KO 251S 2700kg](https://static1.unitrailer.co.uk/hpeciai/9beb90a218c90c00a5ffd870f9da6e48/pol_il_32-32.png)
Overrun device for trailers AL-KO 251S 2700kg
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£231.9923199 PTS
- Catalog number:
- GVW:
![Coupling unit for trailers - KNOTT KF27 2700kg](https://static2.unitrailer.co.uk/hpeciai/6a6851a4deb941e892a3921278587500/pol_il_196-196.png)
Coupling unit for trailers - KNOTT KF27 2700kg
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£250.9925099 PTS
- Catalog number:
- GVW:
![Coupling head for trailers Knott KQ14A 50 mm 1400 kg](https://static5.unitrailer.co.uk/hpeciai/7ce1475461acc97302deb4bdff3f0c61/pol_il_302-302.png)
Coupling head for trailers Knott KQ14A 50 mm 1400 kg
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£23.992399 PTS
- Catalog number:
- Diameter of mounting holes:
- GVW:
![Coupling head Winterhoff WW 8-D40 800 kg 40x40 mm](https://static1.unitrailer.co.uk/hpeciai/23c18aceab15e55879680baf24d6e60a/pol_il_1227-1227.png)
Coupling head Winterhoff WW 8-D40 800 kg 40x40 mm
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£11.991199 PTS
- Catalog number:
- GVW:
![Coupling unit for trailers AL-KO 1000 kg V 90S/3 AK 161](https://static2.unitrailer.co.uk/hpeciai/4adf91109bcfbe6584b8e651fa3104a8/pol_il_113-113.png)
Coupling unit for trailers AL-KO 1000 kg V 90S/3 AK 161
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£190.9919099 PTS
- Catalog number:
- GVW:
![Coupling for trailers AL-KO 3000kg V 251G AK301](https://static4.unitrailer.co.uk/hpeciai/9f251aca9ac88ef6a0f65c59faceb320/pol_il_127-127.png)
Coupling for trailers AL-KO 3000kg V 251G AK301
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£296.9929699 PTS
- Catalog number:
- GVW:
![Coupling head for trailers Steelpress ZSK 750 H](https://static3.unitrailer.co.uk/hpeciai/333f6955827febd70921ae0ff90af289/pol_il_186-186.png)
Coupling head for trailers Steelpress ZSK 750 H
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£14.991499 PTS
![Coupling head for trailers Knott K 7,5-D 60 mm 750 kg](https://static2.unitrailer.co.uk/hpeciai/7530005e056ecddd32d45d862871a7e0/pol_il_254-254.png)
Coupling head for trailers Knott K 7,5-D 60 mm 750 kg
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£17.991799 PTS
- Catalog number:
- Diameter of mounting holes:
- GVW:
![KNOTT K27A M14 ball hitch for a 50mm round drawbar for a 2700kg trailer, cast iron](https://static4.unitrailer.co.uk/hpeciai/070889833b9e89f2fc070d0b07e1bcd2/pol_il_380-380.jpg)
KNOTT K27A M14 ball hitch for a 50mm round drawbar for a 2700kg trailer, cast iron
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£48.994899 PTS
![Zaczep kulowy Winterhoff WW 8-B 800 kg 60 mm](https://static2.unitrailer.co.uk/hpeciai/3e75a031bebd49802e25a1bd1fe508a4/pol_il_718-718.png)
Zaczep kulowy Winterhoff WW 8-B 800 kg 60 mm
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£12.491249 PTS
- Catalog number:
- Material:
- GVW:
![Coupling head Winterhoff WW 8-H 800 kg 70x70 mm](https://static1.unitrailer.co.uk/hpeciai/68daf04ee1b9ed2eb6716bf543441322/pol_il_721-721.png)
Coupling head Winterhoff WW 8-H 800 kg 70x70 mm
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£12.991299 PTS
- Catalog number:
- GVW:
- Material:
![Coupling head WW 150-VG 1500 kg 70x70 mm Winterhoff](https://static4.unitrailer.co.uk/hpeciai/6c4075a9a0d23cd0950d86185006106b/pol_il_744-744.png)
Coupling head WW 150-VG 1500 kg 70x70 mm Winterhoff
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£24.992499 PTS
- Model:
- Catalog number:
- GVW:
![Coupling head Winterhoff WW 150-VF 1500 kg 60x60 mm](https://static2.unitrailer.co.uk/hpeciai/6c4075a9a0d23cd0950d86185006106b/pol_il_867-867.png)
Coupling head Winterhoff WW 150-VF 1500 kg 60x60 mm
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£30.993099 PTS
- Catalog number:
- GVW:
- Material:
- For drawbar type::
![Safety rubber bellow AL-KO 30S/60S/90S FI35](https://static2.unitrailer.co.uk/hpeciai/365e5cd94090183653dc5263fc33a20c/pol_il_1228-1228.jpg)
Safety rubber bellow AL-KO 30S/60S/90S FI35
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£5.99599 PTS
- Reference:
![Rubber bellows - KNOTT KF7,5-KF30 protective rubber](https://static1.unitrailer.co.uk/hpeciai/aef09f8aa1189659272c17bd5da8f53d/pol_il_1537-1537.jpg)
Rubber bellows - KNOTT KF7,5-KF30 protective rubber
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£7.49749 PTS
![Shock absorber for overrun device AL-KO 251S 2700 kg - new model](https://static5.unitrailer.co.uk/hpeciai/0aef066c360e354339ff1dde1fcca0d1/pol_il_1768-1768.jpg)
Shock absorber for overrun device AL-KO 251S 2700 kg - new model
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£51.995199 PTS
- Catalog number:
- For the coupling unit:
- GVW:
![Ball hitch for trailer Knott K14A fi 50 mm N-3](https://static2.unitrailer.co.uk/hpeciai/fac7248b9307439ed4500043dc433482/pol_il_3256-3256.png)
Ball hitch for trailer Knott K14A fi 50 mm N-3
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£25.992599 PTS
- Model:
- Catalog number:
- Diameter of mounting holes:
- GVW:
![Cover for trailer overrun device](https://static5.unitrailer.co.uk/hpeciai/339362b939deb8af6d92feeeb289310e/pol_il_4733-4733.png)
Cover for trailer overrun device
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£10.991099 PTS
- Catalog number:
![Front and rear friction pads AL-KO AKS 3004/3504](https://static4.unitrailer.co.uk/hpeciai/292ce40c411dc31ad6c2c62baff12bef/pol_il_4814-4814.jpg)
Front and rear friction pads AL-KO AKS 3004/3504
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£27.992799 PTS
![Coupling unit for trailers AL-KO 251S 2700kg + AKS3004](https://static3.unitrailer.co.uk/hpeciai/a44ef0f7f7a8f2c94825f7cdf6f15a19/pol_il_110-110.png)
Coupling unit for trailers AL-KO 251S 2700kg + AKS3004
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£424.9942499 PTS
- Catalog number:
- GVW:
![Coupling unit for trailers AL-KO 1600kg KW100 161S AK160](https://static1.unitrailer.co.uk/hpeciai/d698ab788adfc61f126e6173defe3808/pol_il_114-114.png)
Coupling unit for trailers AL-KO 1600kg KW100 161S AK160
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£294.9929499 PTS
- Catalog number:
- GVW:
- Coupling type:
![AL-KO coupling unit for trailers 1600kg V 161S AK161](https://static4.unitrailer.co.uk/hpeciai/b35a0b538e806e0e85410488e9829bec/pol_il_115-115.png)
AL-KO coupling unit for trailers 1600kg V 161S AK161
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£231.9923199 PTS
- Catalog number:
- GVW:
![Coupling unit for trailers AL-KO 2600kg KW100 251S AK270](https://static3.unitrailer.co.uk/hpeciai/69e38a6cd9dbf60e86b37e42a23acc07/pol_il_129-129.png)
Coupling unit for trailers AL-KO 2600kg KW100 251S AK270
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£305.9930599 PTS
- Catalog number:
- GVW:
![Coupling unit for trailers AL-KO 3500kg KW120 2,8VB1 AK351](https://static4.unitrailer.co.uk/hpeciai/771b178771d6e7bdf56bcff927adb183/pol_il_130-130.png)
Coupling unit for trailers AL-KO 3500kg KW120 2,8VB1 AK351
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£638.9963899 PTS
- Catalog number:
- GVW:
![Coupling unit for trailers AL-KO 3500kg V 2,8VB1 AK351](https://static4.unitrailer.co.uk/hpeciai/2d98f9081d33c913cb0ef3ec5ceed3e1/pol_il_131-131.png)
Coupling unit for trailers AL-KO 3500kg V 2,8VB1 AK351
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£501.9950199 PTS
- Catalog number:
- GVW:
![Coupling head AL-KO AK351 3500kg for 251S](https://static3.unitrailer.co.uk/hpeciai/3b3577e843131316bb568f5c74877bab/pol_il_132-132.png)
Coupling head AL-KO AK351 3500kg for 251S
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£122.9912299 PTS
- Catalog number:
- Type of drawbar:
- GVW:
![Coupling unit for trailers - KNOTT KF13 1400kg](https://static3.unitrailer.co.uk/hpeciai/2b05ce423a9b74fc0a58adc462a03215/pol_il_289-289.png)
Coupling unit for trailers - KNOTT KF13 1400kg
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£224.9922499 PTS
- Catalog number:
- GVW:
![Coupling unit KNOTT KF20A 1100-2000 kg.](https://static2.unitrailer.co.uk/hpeciai/1cbec300f2301cbdd72dcfc29778c3c2/pol_il_290-290.png)
Coupling unit KNOTT KF20A 1100-2000 kg.
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£259.9925999 PTS
- Catalog number:
- GVW:
![Coupling unit for trailers - KNOTT KF17 1700kg](https://static4.unitrailer.co.uk/hpeciai/d81d5cf24c5ebc6560bc29f0ad620165/pol_il_291-291.png)
Coupling unit for trailers - KNOTT KF17 1700kg
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£241.9924199 PTS
- Catalog number:
- GVW:
![KNOTT KFG30 3000 kg coupling unit for trailers](https://static4.unitrailer.co.uk/hpeciai/ce523da58e7474b16995124cf7dd54aa/pol_il_292-292.png)
KNOTT KFG30 3000 kg coupling unit for trailers
![status_icon](/data/lang/eng/available_graph/graph_1_1.png)
£410.9941099 PTS
- Catalog number:
- GVW:
![Coupling unit for trailers KNOTT KFG35D 3500kg](https://static4.unitrailer.co.uk/hpeciai/8e4f0ea505c1466fa773bd71cc0534c4/pol_il_293-293.png)
Coupling unit for trailers KNOTT KFG35D 3500kg
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£539.9953999 PTS
- Catalog number:
- GVW:
![AL-KO DIN drawbar eye DIN 2,8VB 351VB ⌀ 60](https://static3.unitrailer.co.uk/hpeciai/9d9003f6b546380f74ae3850df7a126f/pol_il_407-407.jpg)
AL-KO DIN drawbar eye DIN 2,8VB 351VB ⌀ 60
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£172.9917299 PTS
- Catalog number:
- Pipe diameter:
- Eyelet diameter:
![Shock absorber for trailers AL-KO 101VB/90S](https://static2.unitrailer.co.uk/hpeciai/58c3572957218769705a6af6809f2fe2/pol_il_450-450.jpg)
Shock absorber for trailers AL-KO 101VB/90S
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£66.996699 PTS
- Catalog number:
- For the coupling unit:
![Overrun device AL-KO 60S/2 750kg](https://static5.unitrailer.co.uk/hpeciai/522134eae8d580caddb78475b4e79678/pol_il_523-523.png)
Overrun device AL-KO 60S/2 750kg
![status_icon](/data/lang/eng/available_graph/graph_1_1.png)
£187.9918799 PTS
- Catalog number:
- GVW:
![Coupling unit for trailer AL-KO 1600kg KW100 161S AK160](https://static3.unitrailer.co.uk/hpeciai/8d648581c3e32c5d2d642fd96fee7230/pol_il_528-528.png)
Coupling unit for trailer AL-KO 1600kg KW100 161S AK160
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£308.9930899 PTS
- Catalog number:
- GVW:
![Coupling head Winterhoff WW 13-N 1500 kg](https://static5.unitrailer.co.uk/hpeciai/d616816011a302528b310afb72ea7c54/pol_il_715-715.png)
Coupling head Winterhoff WW 13-N 1500 kg
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£30.993099 PTS
- Catalog number:
- Material:
- GVW:
![Coupling head Winterhoff WW 150-RB 1500 kg](https://static1.unitrailer.co.uk/hpeciai/f14617ad72277e8ea8cc85fc6fba0bba/pol_il_716-716.png)
Coupling head Winterhoff WW 150-RB 1500 kg
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£31.993199 PTS
- Catalog number:
- Material:
- GVW:
![Overrun device bellow AL-KO 2.8VB FI60](https://static5.unitrailer.co.uk/hpeciai/1b4c850746502aae3adb7e407078a580/pol_il_1230-1230.jpg)
Overrun device bellow AL-KO 2.8VB FI60
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£17.991799 PTS
- Reference:
![Support bracket for overrun device AL-KO 150 mm](https://static2.unitrailer.co.uk/hpeciai/3c7ebb1d64013c7b3c8956c40d570111/pol_il_1428-1428.jpg)
Support bracket for overrun device AL-KO 150 mm
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£6.99699 PTS
- Reference:
- Material:
- Frame height needed:
![Stabiliser coupling AL-KO AKS 3004 - up to 3000 kg](https://static5.unitrailer.co.uk/hpeciai/176e456ac327fa5ef052932f4574752e/pol_il_1429-1429.jpg)
Stabiliser coupling AL-KO AKS 3004 - up to 3000 kg
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£414.9941499 PTS
![AL-KO coupling ball AK 161 1600 kg with Soft Dock](https://static5.unitrailer.co.uk/hpeciai/30b12fc470d1b2671cb7cb970e99c94a/pol_il_1430-1430.jpg)
AL-KO coupling ball AK 161 1600 kg with Soft Dock
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£53.995399 PTS
- Material:
- GVW:
- Nose load:
- Pipe diameter:
![KNOTT overrun device for 2700kg trailer, overrun brake KF27B K27A](https://static3.unitrailer.co.uk/hpeciai/325dc316edebc1e2d98b33dabc2999d1/pol_il_1471-1471.jpg)
KNOTT overrun device for 2700kg trailer, overrun brake KF27B K27A
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£274.9927499 PTS
- Catalog number:
- GVW:
![Trailer bellow - rubber protection for KNOTT overrun device KFG35](https://static1.unitrailer.co.uk/hpeciai/d58903db71204e47a1b92294d1ff5432/pol_il_1539-1539.jpg)
Trailer bellow - rubber protection for KNOTT overrun device KFG35
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£13.491349 PTS
![Coupling head for trailers Steelpress ZSK 750 J 70x70 mm](https://static3.unitrailer.co.uk/hpeciai/f361a99243e202518b9d96630645e0de/pol_il_1673-1673.jpg)
Coupling head for trailers Steelpress ZSK 750 J 70x70 mm
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£16.991699 PTS
- Model:
- Material:
- Reference:
- Type of drawbar:
- Drawbar width:
![Trailer coupling hitch 750 C for pipes with a 50 mm diameter](https://static2.unitrailer.co.uk/hpeciai/ebb2817553f550060de01e85ac85b436/pol_il_1706-1706.png)
Trailer coupling hitch 750 C for pipes with a 50 mm diameter
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£16.991699 PTS
![Overrun shock absorber 251S 2600 kg - old model](https://static5.unitrailer.co.uk/hpeciai/ae331f6970bcb11b6ac76b28dc47c51a/pol_il_1767-1767.jpg)
Overrun shock absorber 251S 2600 kg - old model
![status_icon](/data/lang/eng/available_graph/graph_1_4.png)
£87.998799 PTS
- Catalog number:
- For the coupling unit:
- GVW:
- 1
- 2
![Zaczepy do przyczep](https://unitrailer.pl/pol_pl_Zaczep-kulowy-WW8-E-do-przyczep-800kg-kwadrat-50x50-Winterhoff-34_6.jpg)
Coupling heads
Coupling heads are used to attach the trailer onto a vehicle. There are many different types of coupling heads - coupling heads for V-shaped drawbars, coupling heads for T-shaped drawbars, coupling heads for pipe-shaped drawbars etc. The main point of difference between them however, is their maximum permissible GVW value, maximum load capacity of the coupling hook and last but not least, their spacing between mounting holes, which can all vary from model to model. In the case of coupling heads available in our online store, all the information that you need for individual coupling models can be found on the product's page.Coupling heads are equipped with a wear indicator, which helps to assess when the accessory in questions needs replacing. Another helpful source of information about the coupling head is the coupling correctness indicator, with the aid of which trailer users assess whether or not the trailer has been correctly connected onto a vehicle.
Trailer coupling units
Trailer coupling units also known as overrun devices are trailer accessories which are made up of not only a braking system but also of a coupling head and a steel casing, which connects the device together. It is possible to replace individual coupling unit parts rather than then whole set. It is also possible to equip the unit with shock absorbers.Coupling units for heavy-duty braked trailers with a GVW of 750kg or more are mounted onto drawbars of regular car trailers and tow trucks. There is no need to assemble a coupling unit onto a light-duty trailer, as it is required neither by law nor by sheer laws of physics, which would otherwise demand for a heavy-duty trailer to be equipped with such an accessory. Using a coupling unit will therefore increase safety levels when your trailer is in drive mode and will thus significantly decrease the force exerted on your car's brake system.
Car trailer coupling heads and coupling units
The more a car trailer coupling unit is used, the more likely it is that it is going to fall victim of natural wear and tear. Before you head off on a long trip, it is worth checking the wear indicator of the coupling unit and the coupling head.Coupling units are the only trailer element apart from the brake cord which connect the trailer with the towing vehicle. Assemblying the trailer coupling unit correctly is the first step which needs to be taken in order to reassure oneself of a safe drive. Here, at Unitrailer, we care about high quality products. It is for this reason that we sell only AL-KO, KNOTT, WINTERHOFF and STEELPRESS coupling units, as they offer the highest possible quality on the market. Choose the right coupling unit today and take care of your brake system the right way!