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ISO 5211 Mounting Components
-- Steady & Reliable Manufacturer --
Brief Product Description
ISO 5211 mounting components are the flanges, adapters, brackets and bushings that make an actuator or gearbox fit a quarter-turn valve through a standard interface. ISO 5211 defines flange sizes, pitch circle diameters, spigots and bolt patterns so parts from different makers can be combined. Buyers include valve makers, actuator brands, integrators and spare parts distributors.
The details that matter are the F-size, pitch circle diameter, number and size of bolt holes, spigot diameter and depth, drive type and tolerance, and the material and coating. Flatness of the mounting face and accuracy of the center bore are especially important, since small errors lead to misalignment and seal wear.
We cast and machine these components in the same plant, so interface dimensions are controlled from raw casting to final check. We supply from F03 up to F25 and can modify patterns to your drawing under OEM and ODM terms. Samples are usually ready in 7 to 20 days, and MOQ typically starts at 100 to 300 pieces.
Spigots, bores and bolt patterns are verified with gauges, and flatness is checked on the mounting face before packing. Components are separated in trays so that precision surfaces are not scratched in transit.
Component Types
Flanges, adapters, brackets, drive bushings
Standard
ISO 5211, with DIN 3337 drive shapes
Size Range
F03, F04, F05, F07, F10, F12, F14, F16, F25
Materials
Aluminum alloy, steel on request
Machining
CNC with controlled flatness and bore concentricity
Service
OEM and ODM, samples, MOQ from 100 pieces
Product Overview
ISO 5211 is the international standard that defines the mounting interface between a part-turn valve and its actuator or gearbox. It sets flange designations from F03 to F40, along with pitch circle diameters, bolt hole sizes and spigot dimensions, so that a valve built to the standard accepts a matching actuator without custom work.
ISO 5211 mounting components put that standard into practice. A flange or adapter plate carries the bolt pattern and spigot on one side and the actuator's pad on the other. Drive bushings convert the actuator output to the valve stem shape. When the face is flat and the center bore is concentric, the actuator sits true, torque passes smoothly and the stem seal avoids side loading.
Standard
ISO 5211
F-Size Range
F03 to F25
Process
Casting and CNC
Quality System
ISO 9001
Main points for buyers
- F-size selection: Choose the flange that matches the valve pad and the required torque.
- Dual patterns: Many valves and actuators carry two bolt circles, so confirm which one is used.
- Spigot and bore: Check spigot diameter, depth and center bore tolerance.
- Drive shape: Confirm square, double-D or star drive and the key or bore tolerance.
- Flatness and finish: Ask for face flatness, parallelism and coating requirements.
Costs for ISO 5211 components depend on size, material, machining time, tolerance, surface finish and batch size. Adapters that convert between two F-sizes need more machining than a simple flange. Request quotations that state material, tolerance class, plating or coating and packaging, so prices can be compared accurately.
Specification
| Parameter | Specification |
| Component Type | Mounting flange, adapter plate, bracket, drive bushing |
| Standard | ISO 5211 for flange; DIN 3337 for drive shapes |
| F-Size | F03, F04, F05, F07, F10, F12, F14, F16, F25 |
| Pitch Circle Diameter | F03 36 mm, F04 42 mm, F05 50 mm, F07 70 mm, F10 102 mm, F12 125 mm, F14 140 mm, F16 165 mm, F25 254 mm |
| Material | Aluminum alloy A356-T6 or ADC12; steel on request |
| Face Flatness | 0.05 mm or per drawing |
| Bore Tolerance | H7 or per drawing |
| Drive Shape | Square, double-D, star, keyed |
| Surface Treatment | Anodizing, powder coating, painting |
| Operating Temperature | -30 to +120 degrees C for aluminum |
| Inspection | Dimensional check, gauge check for spigot and bore |
| Packaging | Protective trays, cartons and pallets |
Application
Application Scenarios
| Industry | Typical Use | Key Requirement |
| Actuator manufacturing | Flanges and adapters on pneumatic actuators | Exact pitch circle and spigot |
| Valve manufacturing | Mounting pads on ball and butterfly valves | Flat faces and stable fits |
| Retrofit projects | Adapter plates between mismatched sizes | Custom machining to drawing |
| Gearbox assembly | Output flange for worm gear operators | Concentric bore for smooth rotation |
| Maintenance supply | Spare adapters and brackets | Fast supply of common sizes |
Target Customers
Actuator Brands
Need standard-compliant flanges and adapters with tight, repeatable machining.
Valve Manufacturers
Need mounting pads that accept any ISO 5211 actuator.
Integrators and Distributors
Need adapter plates for mixed brands.
Suitable and Unsuitable Uses
Suitable Uses
- Interfacing quarter-turn valves with actuators
- Converting between two ISO 5211 sizes
- Retrofitting older valves
- Building standard product ranges
Unsuitable Uses
- Valves that do not follow ISO 5211
- Multi-turn valve interfaces
- Loads beyond the flange torque capacity
- Service above the material temperature limit
Selection Guidance
Usage Notes
- Confirm the F-size on both valve and actuator before ordering.
- Check bolt hole thread depth and the correct fastener grade.
- Clean mounting faces before assembly.
- Tighten bolts evenly in a cross pattern.
- Check alignment by turning the assembly by hand before commissioning.
Advantages
Dimensional accuracy
CNC machining on 5 machining centers keeps face flatness and center bore within the drawing tolerance. Proper alignment prevents stem side load and extends seal life.
Complete size range
We machine F03 to F25 patterns, including dual bolt circles. You can source a whole family of flanges and adapters from one place.
Aluminum or steel
Aluminum alloy keeps weight low, and steel is available for higher torque. Choosing the right material controls cost without risking the joint.
Custom adapters
Engineers can design adapter plates between different F-sizes or special drives. Retrofit jobs finish faster, with fewer site modifications.
In-house casting
Gravity and die casting give us castings sized for each flange. Less machining allowance means lower cost per part.
Quality control
ISO 9001 procedures and gauge checks on spigots and bores support audit needs. Consistent fit lowers your assembly rejection rate.
Frequently Asked Questions
- Q: What is ISO 5211?
- A: It is an international standard for the mounting interface between part-turn valves and actuators or gearboxes, covering flange size, pitch circle and spigot.
- Q: Which F-sizes can you supply?
- A: We machine F03 to F25 components. Larger sizes can be reviewed case by case.
- Q: Can you make an adapter between two F-sizes?
- A: Yes. Adapter plates are made to your two interface drawings, with bolt patterns and spigots on each side.
- Q: What flatness and bore tolerance can you hold?
- A: Typical flatness is 0.05 mm and bore tolerance is H7, or tighter values according to the drawing.
- Q: What materials are available?
- A: Aluminum alloy A356-T6 and ADC12 are standard. Steel can be supplied on request for higher torque.
- Q: Do you also machine DIN 3337 drive shapes?
- A: Yes. Square, double-D and star shapes can be machined to your drawing.
- Q: What is the MOQ?
- A: MOQ usually starts at 100 to 300 pieces per item. Mixed sizes can often be combined.
- Q: How do I confirm compatibility?
- A: Send the valve and actuator datasheets or photos of the mounting pads, and our engineers will check the match before quoting.
Contact us to learn more
Tell us your drawing, sample or application for iso 5211 mounting components, together with material, finish and expected annual quantity. Our engineers will review the details and reply with a clear quotation, sampling plan and lead time.
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