Ring Stretcher

Enlarge, stretch, and true plain wedding bands and precious metal ring shanks with high mechanical leverage. Built with a solid cast iron base weighing 8.16 pounds (approx. 3.7 kg), this Benchtop Mechanical Ring Stretcher provides stable, wobble-free operation on jewelry benches without tipping. Equipped with an upright precision expansion mandrel featuring four premium chrome splines and clear laser-engraved graduations, it accommodates major international sizing standards: US Sizes (1–14), EUR Sizes (41–71), HK Sizes (8–32), and JP Sizes (1–32). With a high-leverage ball-head operating handle and pre-drilled bench-mounting holes, it delivers uniform, symmetrical band enlargement for jewelry studios, retail counters, and repair workshops.

Why Choose the Heavy-Duty Benchtop Ring Stretcher

• Solid Cast Iron Stability (8.16 lbs): Thick cast iron base absorbs operating forces, providing a rock-solid platform for smooth sizing even when operating unbolted on counter surfaces.

• Dual Benchtop Setup (Freestanding or Bolted): Features pre-drilled flange mounting holes, allowing jewelers to bolt the unit directly to a workbench or use it as a portable freestanding sizing station.

• Even 4-Spline Chrome Mandrel: Precision-ground 4-segment expansion mandrel opens symmetrically to distribute outward pressure evenly around the entire circumference, preventing ring warping or oval distortion.

• Comprehensive International Sizing Scales: Deeply etched, permanent graduations marked across the spline faces provide real-time visual tracking across four international standards:

  • US Size: 1 to 14

  • EUR Size (Circumference): 41 to 71 mm

  • HK Size: 8 to 32

  • JP Size: 1 to 32

• High-Leverage Lever with Ergonomic Ball Head: Extended mechanical steel lever with a smooth round ball grip multiplies user input force, making band expansion smooth with minimal physical strain.

• Protective Tip Assembly: Heavy-duty rubber cap and retaining screw keep the 4-spline segments aligned and prevent them from over-extending or detaching during rapid cycling.

Technical Specifications & Product Matrix

Product Designation	Benchtop Ring Stretcher / Ring Enlarger Machine
Primary Usage	Ring Size Expanding, Band Sizing, Rounding & Reshaping
Compatible Size Standards	US: 1–14 • EUR: 41–71 • HK: 8–32 • JP: 1–32
Integrated Scales	Multi-Standard Readouts (US, EUR Circumference, HK/JP Index)
Base Construction	Heavy-Duty Solid Cast Iron with Hammertone Powder Coat
Mandrel Construction	4 Premium Chrome-Plated Tool Steel Splines
Overall Dimensions	12.5 cm (W) × 12.5 cm (D) × 28 cm (H) (4.92 × 4.92 × 11.02 in)
Net Unit Weight	8.16 lbs (Approx. 3.70 kg)
Operating Mechanism	Vertical Lever Arm with Ergonomic Ball-Head Handle
Mounting Options	Bench-Mountable (Pre-Drilled Holes) or Freestanding
Color & Finish	Industrial Charcoal Hammertone Base with Chrome Hardware