High Precision Internal Expanding Mandrel Set for Watch Repair – 8mm Lathe Chuck for Case Thread Ring & Back Cover Polishing

This high-precision internal expanding mandrel set is specially designed for professional watchmakers and hobbyists engaged in delicate repair and restoration work. Crafted from premium aviation aluminum alloy, these mandrels ensure exceptional durability, lightweight handling, and resistance to wear. Ideal for tasks such as repairing watch case threads, fixing bezel rings, and polishing watch backs with accuracy and ease.
The set includes 30 mandrels in three sizes (30mm, 35mm, and 40mm), each size supplied with 10 pieces, offering versatility for various watch models and components. Housed in a sturdy wooden storage box, this kit helps keep your workspace organized while protecting your tools.
Whether you’re restoring vintage timepieces or performing routine maintenance, this mandrel set delivers the precision and reliability required for professional results.

Specifications:

Product Name: High Precision Internal Expanding Mandrel Set
Material: Aviation Aluminum Alloy
Mandrel Sizes: 30mm, 35mm, 40mm (10 pieces per size)
Total Quantity: 30 pcs
Wooden Box Dimensions: 270 x 170 x 105 mm
Product Weight: 1630 g

Features:

Made from high-grade aviation aluminum alloy
Suitable for 8mm watchmaker lathes
Perfect for internal gripping, threading, and polishing
Includes 30 mandrels (10 of each size)
Compact wooden storage box for organization and portability
Ideal for repairing watch cases, thread rings, and back covers

Ideal for:

Watch repair specialists, jewelers, and horology enthusiasts working on watch case threading, bezel restoration, and back cover polishing.