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3M™ Roto Peen Mandrel

Products
  • 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
 More...
Overall Width (Imperial)
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Overall Length (Imperial)
Overall_Length_Imperial
Thread Size
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 Overall Width (Imperial), Overall Length (Imperial) and Thread Size
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Specifications
Attribute Name
Value
Attachment Type
Shaft
Brand
3M™
Equipment - Machines
Die Grinders, Disc Sanders
Form Type
Roto Peen
Function/Attachment Style
Mechanical Attachment
Industries
Aerospace
Market
Defense, Facilities Management
National Stock Number
5130010444549
Net Weight (Imperial)
0.2 lb
Net Weight (Metric)
90.72 g
Overall Height (Imperial)
4.7 in
Overall Height (Metric)
11.94 cm
Overall Length (Imperial)
4.7 in
Overall Length (Metric)
11.94 cm
Overall Width (Imperial)
4.7 in
Overall Width (Metric)
11.94 cm
Product Type
Mandrel
Segment
Maintenance
Thread Size
1/4"M
Type
Regular
Product Details
  • 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

The 3M™ Roto Peen Mandrel grips small flaps containing captive shot for peening of fine tolerance metals components. For use with flap assembly, we offer three sizes for internal diameters and flat surfaces.

We engineered our 3M™ Roto Peen Mandrel to deliver quick, efficient repair and maintenance to U.S. Army helicopters to components like rotors and rotor hubs in the field.
Available in three sizes for both small and large surface areas
Science in the Service of U.S. Soldiers
We engineered our 3M™ Roto Peen Mandrel to deliver quick, efficient repair and maintenance to U.S. Army helicopters to components like rotors and rotor hubs in the field, our 3M™ Roto Peen Mandrel and its associated flap assembly allowed peening action using a die grinder or disc sander. In the early 1970s, the 3M™ Roto Peen Flap Assembly (or TC 330) was qualified and written into military specifications. It soon spread to other aerospace applications.

Used today primarily for aerospace applications, the mandrel comported with a flap assembly allows use of a die grinder or disc sander to perform captive shot peening to repair metal surfaces. The assembly consists of tungsten carbide shot bonded to a flexible polymeric flap gripped by the mandrels attached to the power tool. The spinning flap is held near the surface so that the captive shot hammers the metal surface with each revolution.

Portable, Able to Reach Small Areas and Large Components
Our 3M flap/mandrel assemblies provide convenient portability and are especially effective for precision in-service rework, manufacturing, repair of small areas, and peening holes with diameters down to 1/2 inch (12.7mm). Flaps can also be cut with scissors to peen confined areas or peen into areas with a radius down to 1/16 inch (1.6mm)

Captive shot peening is used for repair or limited access work or when free shot cannot be tolerated. Having the shot used to peen metal surfaces in a captive flap allows for more control and greater access to areas that require this strengthening procedure.

Evolved from the days of blacksmiths hammering swords, peening is a process that utilizes compressive surface stress to strengthen metals, improving resistance to fatigue fracture and stress corrosion cracking. The aerospace industry has stringent peening specifications, in which adherence must frequently be documented. Off-spec peening can result in the failure of parts.

3M also provides Almen gauges to provide precise readings of strip deflections to measure peening intensities. Adopted by the SAE (Society of Automotive Engineers), the Almen Scale of Peen Intensity measures the curvature of a standardized steel strip when peened on one side.

Recommended Applications
  • MRO in aerospace, military and small shop environments
  • For parts that are too large to fit in a peening cabinet
  • Parts that are subjected to mechanical rework and require 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

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Large Volume Order

If you are considering a large purchase of this or other 3M Abrasive products our inside sales team is ready to help by providing additional information and options that our industrial customers typically seek when making abrasive procurement decisions. Our technical expertise, customer support, and global capabilities put us in a unique position to address your biggest challenges, and we’ll do our best to prove that we should be your abrasive supplier of choice.


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