Precision Brand 74250 Laminated Brass Arbor

Product Description

The PRECISION BRAND 74250 is a laminated brass arbor shim used to reduce bore size and maintain precise concentricity between a cutting tool and its mounting spindle or arbor. At 0.020 inches thick with a 3/4 inch inner diameter and a 1-1/8 inch outer diameter, this shim provides a controlled interference fit that compensates for wear or manufacturing tolerances in arbor assemblies. The laminated brass construction allows the shim to be peeled to achieve intermediate thickness values without requiring a different size. It weighs 0.1 pounds and is sold individually.

Arbor shims like the 74250 are used in machine shop and industrial maintenance environments where milling cutters, saw blades, or grinding wheels must be precisely positioned on an arbor. They are commonly installed by machinists and maintenance technicians working with horizontal or vertical milling machines, arbor presses, and similar toolholding equipment. The laminated design is particularly useful where fine thickness adjustment is needed without swapping multiple shim stock pieces.

Key Features

• Laminated brass construction allows peeling to intermediate thickness values
• 0.020 inches nominal thickness for precise arbor fit adjustment
• 3/4 inch inner diameter fits standard 3/4 inch arbors
• 1-1/8 inch outer diameter provides adequate bearing surface
• Sold individually, allowing purchase of exact quantity needed

Compatibility

Designed as an OEM-style replacement or supplemental shim for toolholding arbor assemblies requiring a 3/4 inch bore and 1-1/8 inch outer diameter shim at 0.020 inches thickness.

Installation Notes

Installation of arbor shims should be performed by a qualified machinist or maintenance technician with the machine fully de-energized and locked out per applicable lockout/tagout procedures. Inspect the arbor bore and mating surfaces for burrs or debris before installing the shim. Do not exceed the clamping torque or arbor load ratings specified by the machine or toolholder manufacturer. Peel laminations only in a controlled manner to avoid introducing uneven thickness across the shim face.

Technical Specifications

• Material: Laminated Brass
• Thickness: 0.020 inches
• Inner Diameter: 0.750 inches (3/4 inches)
• Outer Diameter: 1.125 inches (1-1/8 inches)
• Weight: 0.1 pounds
• Sold As: Each
• UPC: 698158742509

Standard Information

• Brand: PRECISION BRAND
• Manufacturer Part Number: 74250