SKU | 7000046310 |
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Legacy SKU | 61986510339 |
UPC | 00048011037684 |
Product Number | 7210 |
The 3M Roto Peen Mandrel grips small flaps containing captive shot for peening of fine tolerance metals components. For use with flap assembly, it is available in three sizes for internal diameters and flat surfaces.
- Use with Roto Peen Flap Assemblies for die grinders and disc sanders
- Flap/mandrel assembly is portable for added convenience
- Available in three sizes for both small and large surface areas
- For aerospace and other applications in industries with rigorous metal performance standards and specifications
Product Dimensions |
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Shipping Dimensions |
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Weight | 0.19996 lb |
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Length | 6.37795 in |
Width | 4.68504 in |
Height | 4.68504 in |
PRODUCT FAQ
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What is the 3M™ Roto Peen Mandrel 7210 used for?
The 3M™ Roto Peen Mandrel 7210 is designed for use with our RotoPeen Flap Assembly to provide precise surface treatment solutions.
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Can the mandrel be used with other brands' equipment?
It is recommended to use the 3M™ Roto Peen Mandrel 7210 specifically with compatible 3M equipment for optimal performance and results.
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How many units are included in one case of this product?
Each case of the 3M™ Roto Peen Mandrel contains one unit to meet your surface treatment needs.
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Is there a warranty or guarantee on this product?
Yes, we stand by the quality of our products, including the 3M™ Roto Peen Mandrel, and offer warranties to ensure customer satisfaction.
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Are there different sizes available for this mandrel model?
: Currently, this model comes in one standard size (1 ea/Case), but feel free to reach out if you're looking for customization options that may suit your specific needs better.
The 3M Roto Peen Mandrel is a specialized tool designed to provide efficient repair and maintenance to U.S. Army helicopters. It is used to repair components such as rotors and rotor hubs in the field. The mandrel, along with its associated flap assembly, allows for peening action using a die grinder or disc sander. This tool was qualified and written into military specifications in the early 1970s and has since been widely adopted in the aerospace industry.
Today, the mandrel and flap assembly are primarily used for aerospace applications. The assembly consists of tungsten carbide shot bonded to a flexible polymeric flap, which is gripped by the mandrels attached to a power tool. When the flap spins, the captive shot hammers the metal surface with each revolution, effectively repairing metal surfaces through captive shot peening.
The 3M flap/mandrel assemblies are portable and can reach both small areas and large components. They are especially effective for precision in-service rework, manufacturing, and repair of small areas. The assemblies can peen holes with diameters as small as 1/2 inch (12.7mm) and can be cut with scissors to peen confined areas or areas with a radius as small as 1/16 inch (1.6mm).
Captive shot peening is used when repair or limited access work is required, or when free shot cannot be tolerated. By using captive shot in a flap assembly, there is more control and greater access to areas that require strengthening through peening.
Peening is a process that has evolved from the days of blacksmiths hammering swords. It utilizes compressive surface stress to strengthen metals, improving their resistance to fatigue fracture and stress corrosion cracking. The aerospace industry has stringent peening specifications, and adherence to these specifications must be frequently documented to ensure the quality and reliability of parts. To measure peening intensities, 3M also provides Almen gauges, which provide precise readings of strip deflections. The Almen Scale of Peen Intensity, adopted by the SAE (Society of Automotive Engineers), measures the curvature of a standardized steel strip when peened on one side.
Recommended Applications- MRO in aerospace, military, and small shop environments
- Repair of parts that are too large to fit in a peening cabinet
- Parts that require mechanical rework
- Landing gear assemblies
- Wing structures
- Helicopter rotor hub
- Jet engine support members
- Peening after grinding
- Peening before plating
- Peening of surfaces subject to stress corrosion
- Peen straightening
- Peen forming
- Weld heat affect zone
- Bond testing