3 PIECE 2-3/4 TO 3-3/4″ X 17″ ARBOR EXPANDING MANDREL (3902-3078)

3 PIECE 2-3/4 TO 3-3/4″ X 17″ ARBOR EXPANDING MANDREL (3902-3078) (SKU: 3902-3078)

3 Piece 2-3/4 to 3-3/4″ with 17″ Arbor & 7″ Sleeve Expanding Mandrel Set

• Set has 2 expanding sleeves and one mandrel
• Made of 64Mn high grade tool steel
• Precision ground and heat treated for maximum concentricity and holding power
• Arbor hardness is HRC55-60 and sleeve is HRC44-48
• Center holes are ground and lapped
• The automatic expansion feature can be utilized on any bore (standard or non-standard) within the range of the mandrel
• Arbors are tapered and sleeves are flexible
• Size is obtained by moving the sleeve along the arbor

Specifications

• 3 Piece 2-3/4 to 3-3/4″ with 17″ Arbor & 7″ Sleeve Expanding Mandrel Set
• Center holes are ground and lapped.
• Made of 64Mn high grade tool steel.
• Precision ground and heat treated for maximum concentricity and holding power.
• Arbors are tapered and sleeves are flexible.
• The automatic expansion feature can be utilized on any bore (standard or non-standard) within the range of the mandrel.
• Size is obtained by moving the sleeve along the arbor.
• Set has 2 expanding sleeves and one mandrel.
• Arbor hardness is HRC55-60 and sleeve is HRC44-48.
• Weight: 42
• Dimensions: L 10, W 14, H 10

Benefits

• Industrial-grade tooling designed for dependable shop performance.
• Supports consistent results when applied with correct setup practices.
• A practical choice for U.S. machine shops and maintenance work.

Recommended use

• Confirm compatibility (size, interface, machine capacity) before ordering.
• Follow safe operating practices and use appropriate PPE.
• Optimize setup rigidity and process parameters for best results.

USA Warehouse Stock — Fast U.S. fulfillment.