The Festo DHPS-20-A-NO is a two-jaw parallel gripper from the Festo DHPS series, Festo part number 1254047. It gives a stroke of 6.5 mm per gripper jaw, a pneumatic gripping force at 6 bar of 290 N when closing and 320 N when opening, plus the holding force of its spring, and a repetition accuracy of 0.02 mm. It weighs 387 g, has M5 air ports and runs on compressed air from 4 to 8 bar.
Both jaws are driven from a single piston through a positively driven lever mechanism, so they always move together and centre the workpiece by themselves. They run on a plain-bearing T-slot guide that takes side loads and torques directly, which keeps long gripper fingers stable and accurate. The housing is hard-anodised wrought aluminium and the jaws are high-alloy stainless steel.
Both sides of the body carry integrated sensor slots, so SMT-8G, SMAT-8M or SDBT-MSX proximity switches can report the open and closed positions to the PLC without adding width to the gripper.
This is the NO version. An integrated compression spring pushes the jaws open when the gripper is depressurised, so the part is released on an air failure. This is also the version used when the gripper holds the workpiece from the inside. It can be run single-acting, with air used only to close the jaws. Minimum operating pressure is 4 bar because the air has to work against the spring.
Technical specifications
| Brand | Festo |
|---|---|
| Festo part number | 1254047 |
| Type code | DHPS-20-A-NO |
| Series | Festo DHPS |
| GTIN | 4052568229207 |
| Gripper type | Two-jaw parallel gripper, self-centring |
| Size | 20 |
| Mode of operation | Double-acting, with spring gripping force retention when opening |
| Stroke per gripper jaw | 6.5 mm |
| Gripping force at 6 bar, closing (total) | 290 N |
| Gripping force at 6 bar, opening (total) | 320 N |
| Gripping force per gripper jaw at 6 bar, closing | 147 N |
| Gripping force per gripper jaw at 6 bar, opening | 162 N |
| Repetition accuracy | 0.02 mm |
| Operating pressure | 4 to 8 bar |
| Max. operating frequency | 3 Hz |
| Min. opening time at 6 bar | 58 ms |
| Min. closing time at 6 bar | 97 ms |
| Max. mass per external gripper finger | 250 g |
| Max. static force on gripper jaw Fz | 250 N |
| Max. static torque Mx, My, Mz | 14 Nm |
| Mass moment of inertia | 1.521 kgcm2 |
| Pneumatic connection | M5 |
| Ambient temperature | 5 to 60 degrees C |
| Operating medium | Compressed air to ISO 8573-1:2010 [7:4:4] |
| Position sensing | Via proximity switch |
| Mounting | Internal thread with centring sleeve, or through-hole with centring sleeve |
| Housing material | Wrought aluminium alloy, hard-anodised |
| Gripper jaw material | High-alloy stainless steel |
| Corrosion resistance class | CRC 1 |
| Product weight | 387 g |
Dimensions
The dimension drawing for the whole Festo DHPS series, including size 20, is in the image gallery on this page. It is the official Festo drawing with all reference letters, so it can be used directly for designing the mounting interface and the gripper fingers. CAD models for DHPS-20-A-NO are available from Festo, and we can send you the datasheet for part number 1254047 on request.
What the DHPS-20-A-NO is used for
- Pick and place of small and medium parts on assembly and packaging lines
- Loading and unloading CNC machines, presses and test rigs
- Handling caps, preforms, bottles and cartons on filling and bottling lines
- Feeding parts into welding, screwdriving and gluing stations
- Electronics and connector assembly, where the self-centring jaws set the part position
Choosing between DHPS, DHWS and DHRS
Festo builds three standard pneumatic gripper families and they are not interchangeable. DHPS parallel grippers slide both jaws in a straight line and hold the tightest repetition accuracy, 0.02 mm, which suits precise assembly. DHWS angle grippers swing each jaw out by 20 degrees so the part is cleared on release, which suits transfer between fixtures. DHRS radial grippers swing the jaws right back through 180 degrees, so the whole gripper can be withdrawn past the workpiece inside a tight machine.
A full side-by-side comparison of every size and every variant is on our Festo gripper selection guide.
Frequently asked questions
What does the type code DHPS-20-A-NO mean?
DHPS is the Festo series for two-jaw parallel grippers, DHWS for angle grippers and DHRS for radial grippers. The number after it is the size, so this is size 20. The A stands for the standard version of the series. NO means normally open: the built-in spring opens the jaws when there is no air pressure.
What is the difference between the DHPS-20-A, the DHPS-20-A-NC and the DHPS-20-A-NO?
All three share the same gripper body and give the same pneumatic gripping force. The plain A version is double-acting with no spring, so it releases the part if the air is lost, and it works from 2 bar. The NC version adds a spring that closes the jaws when the gripper is depressurised, so the workpiece stays held after an air or power failure. The NO version adds a spring that opens the jaws instead, which is used for internal gripping and for parts that must be dropped on a failure. Both spring versions need at least 4 bar.
How much gripping force does the DHPS-20-A-NO give at 4 bar instead of 6 bar?
The gripping force of a Festo gripper follows the operating pressure almost linearly, so at 4 bar you can expect roughly 193 N closing instead of 290 N at 6 bar. Festo publishes exact force curves for each size in the DHPS catalogue, and the curves also depend on the lever arm of your gripper fingers.
Which position sensors fit the DHPS-20-A-NO?
The body has integrated sensor slots on both sides. The usual choices are the SMT-8G, the SMAT-8M analogue sensor and the SDBT-MSX. Two sensors are normally fitted, one for the open position and one for the closed position.
How long can the gripper fingers be on the DHPS-20-A-NO?
The limit is not the length itself but the load it puts on the jaws. This size takes a maximum static force of 250 N on a gripper jaw and a maximum static torque of 14 Nm in Mx, My and Mz, and a maximum mass of 250 g per external gripper finger. Longer fingers increase the torque and reduce the usable gripping force, so the finger length has to be checked against those figures.
Is this a genuine Festo part?
Yes. RendatSP supplies new original Festo parts in factory packaging. This item is Festo part number 1254047, type code DHPS-20-A-NO, GTIN 4052568229207. We do not sell copies or refurbished units.
Do you ship the DHPS-20-A-NO to Iraq, Saudi Arabia and other Arab markets?
Yes. We ship worldwide from our warehouses and we have local agents in 11 countries, including Saudi Arabia, Iraq, the UAE, Egypt, Oman, Libya, Morocco, Mauritania, Yemen, Algeria and Jordan. Send us the part number and quantity and we will quote delivery to your city.
All Festo DHPS models we supply
| Model | Festo part number | Size | Stroke per jaw | Gripping force at 6 bar, closing | Version |
|---|---|---|---|---|---|
| DHPS-6-A | 1254039 | 6 | 2 mm | 25 N | Double-acting |
| DHPS-10-A | 1254040 | 10 | 3 mm | 70 N | Double-acting |
| DHPS-10-A-NO | 1254041 | 10 | 3 mm | 70 N | Spring opening (NO) |
| DHPS-10-A-NC | 1254042 | 10 | 3 mm | 70 N | Spring closing (NC) |
| DHPS-16-A | 1254043 | 16 | 5 mm | 190 N | Double-acting |
| DHPS-16-A-NO | 1254044 | 16 | 5 mm | 190 N | Spring opening (NO) |
| DHPS-16-A-NC | 1254045 | 16 | 5 mm | 190 N | Spring closing (NC) |
| DHPS-20-A | 1254046 | 20 | 6.5 mm | 290 N | Double-acting |
| DHPS-20-A-NO (this page) | 1254047 | 20 | 6.5 mm | 290 N | Spring opening (NO) |
| DHPS-20-A-NC | 1254048 | 20 | 6.5 mm | 290 N | Spring closing (NC) |
| DHPS-25-A | 1254049 | 25 | 7.5 mm | 450 N | Double-acting |
| DHPS-25-A-NO | 1254050 | 25 | 7.5 mm | 450 N | Spring opening (NO) |
| DHPS-25-A-NC | 1254051 | 25 | 7.5 mm | 450 N | Spring closing (NC) |
| DHPS-35-A | 1254052 | 35 | 12.5 mm | 910 N | Double-acting |
| DHPS-35-A-NO | 1254053 | 35 | 12.5 mm | 910 N | Spring opening (NO) |
| DHPS-35-A-NC | 1254054 | 35 | 12.5 mm | 910 N | Spring closing (NC) |
Sensors and accessories
The parts most often ordered together with a Festo gripper are listed below. Send us the gripper part number and we will quote the matching items in the same offer.
- Proximity switches SMT-8G, SMAT-8M and SDBT-MSX for the integrated sensor slots, and the SMH-S1 Hall sensor for the smallest sizes
- Connecting cables of the NEBU and NEBA families
- Centring sleeves ZBH for accurate mounting of the gripper and of the gripper fingers
- Adapter kits DHAA and HAPG for mounting the gripper on rotary drives, linear axes and robot flanges
- Proportional pressure regulator VPPM, where the gripping force has to be set for delicate workpieces
- Air preparation and fittings, so the gripper receives compressed air to ISO 8573-1:2010 [7:4:4]
Ordering and delivery
RendatSP supplies genuine Festo DHPS-20-A-NO grippers, Festo part number 1254047, new and in original packaging. Prices are quoted on request because they depend on quantity and destination. Send us the part number and the quantity through the order form on this page, by email to info@rendatsp.com, or on WhatsApp at +86 181 5871 1787, and we normally reply with a price and a delivery time within 24 hours.
We hold more than 100,000 industrial spare parts on request, serve over 500 factories, and ship worldwide with local agents in Saudi Arabia, Iraq, the United Arab Emirates, Egypt, Oman, Libya, Morocco, Mauritania, Yemen, Algeria and Jordan. If you are not sure which gripper size your machine uses, send a photo of the part or of the machine label and our engineers will identify it for you.
