1 8

Stainless Steel Un-Grooved Ring Mandrel – US 0–16 & UK A–6 Ring Sizing Tool

Stainless Steel Un-Grooved Ring Mandrel – US 0–16 & UK A–6 Ring Sizing Tool

$27.99 USD
$27.99 USD
Sale Sold out

Built from high-grade stainless steel, this 14-inch ring mandrel features accurate US 0–16 and UK A–6 sizing with deep, dark laser-marked measurements for easy reading. Its smooth, shiny finish, CNC-machined sizing, comfortable curved handle, and sturdy plastic carry case make it a practical professional tool for forming, resizing, and repairing rings at the bench.

Raw Material

Every tool is crafted using quality raw materials to ensure its durability and longevity.

Value Added

Our tools are designed with careful consideration to ensure they deliver exceptional value to you.

Quality Checked

Each tool passes through a meticulous quality inspection procedure.

Well packed

All our tools are carefully packed to ensure they arrive in perfect condition.

Shipping

Free shipping and returns available on all orders!

We ship all US domestic orders within 1-3 business days!

View full details
👥
Trusted by 20,000+ Jewelers
Across the United State
🚀
Fast Delivery
Ships in 1–3 Days
📦
Free Shipping
All US Orders
↩️
7 - Days Free Returns
100% Hassle-Free
🔍
Quality Checked
Every Unit

What is Un-Grooved Ring Mandrel – US 0–16 & UK A–6?

A stainless steel un-grooved ring mandrel is a jewelry-making tool used to check ring sizes, shape ring bands, and help restore roundness during ring forming and resizing. This model covers US ring sizes 0–16 and UK sizes A–6, making it suitable for jewelers and jewelry makers who work with a wide range of ring sizes.

Its smooth, un-grooved surface is useful when shaping metal rings without transferring groove marks onto the band. The 14-inch mandrel features laser-marked size measurements, CNC machining, a curved handle, and a plastic storage case for convenient handling and storage.

Whether you make new rings in a jewelry studio or carry out ring repairs at a workbench, this ring sizing mandrel provides a practical reference for measuring and forming ring bands.

Technique

How to Use Stainless Steel Un-Grooved Ring Mandrel – US 0–16 & UK A–6

A stainless steel ring mandrel handles more than a quick size check. The trick with any resizing or forming work is to move gradually and check often instead of trying to get there in one pass.

1
Place the ring on the mandrel
Slide the ring over the tapered end and let it travel naturally down the shaft to the point you want to check. With an existing ring, resist the urge to force it further down — that gives you a misleading, smaller-than-actual reading.
2
Read the ring size
Look for where the inside edge of the ring lines up with the marked scale. Use the US 0–16 scale for US sizing, or the UK A–6 scale if the project calls for UK sizing — both run the full length of the shaft, so you're never guessing which mark applies.
3
Form or round the ring
To form a new band or correct a ring that's gone slightly oval, position it at the right point on this ring, forming a mandrel, and apply light, controlled taps with a jewelry hammer or mallet, rotating the ring as you go. Working evenly around the band gives a rounder result than concentrating strikes in one spot.
4
Check the size as you work
Stop every few taps and check the ring against the scale again. Small adjustments add up faster than you'd expect, especially during resizing or reshaping.
5
Finish the ring
Once the ring is at the size and shape you want, take it off the mandrel and move on to filing, polishing, soldering, or stone setting.

Product Details

Features & Technical Specifications

Features

  • Stainless steel construction
  • Smooth, un-grooved working surface
  • US ring sizes 0–16
  • UK ring sizes A–6
  • CNC machined for consistent sizing accuracy
  • Deep, dark laser-marked size references
  • Smooth, shiny finish
  • 14-inch length
  • Curved handle for a secure grip
  • Suitable for ring sizing, forming, reshaping, rounding, and straightening
  • Strong plastic carry box included

Technical Specifications

Product Type Ring Mandrel
Material Stainless Steel
Design Un-Grooved
US Ring Sizes 0–16
UK Ring Sizes A–6
Length 14 inches
Marking Deep, Dark Laser Marked
Manufacturing Process CNC Machined
Surface Finish Smooth / Shiny
Handle Curved
Storage Strong Plastic Carry Box
Primary Uses Sizing, Forming, Reshaping, Rounding & Straightening
Suitable For Jewelers, Metalsmiths, Jewelry Makers & Repair Professionals
Manufacturer Splenor Tools (manufacturing jewelry tools since 2017)
Shipping Free US shipping, 1–3 business days
Returns 7-day return window

Buying Guide

Specs, Sizing & What to Order With It

Not every ring project calls for the same stainless steel ring mandrel. Before you buy, think through the sizing system you use most, the type of ring work you do, and whether a smooth or grooved shaft suits it better.

Is this ring sizing mandrel right for you?

This is a good fit if you need US sizes 0–16, UK sizes A–6, a smooth un-grooved surface, stainless steel construction, and one mandrel that handles checking, forming, and reshaping without switching tools. The wide size range especially pays off if your work spans a broad mix of ring sizes rather than a narrow band.

What to order alongside this ring mandrel:
US 0–16 coverage

For US-based work, this scale gives you a wide range on a single mandrel — useful across custom orders, wedding bands, handmade rings, and repair jobs alike.

UK A–6 coverage

The second scale means a UK-referenced size doesn't send you hunting for a different tool; it's marked right alongside the US scale.

Un-grooved vs. grooved

The difference comes down to the working surface. An un-grooved mandrel like this one has a continuous smooth shaft suited to general sizing, forming, rounding, and reshaping. A grooved ring mandrel has a channel that can help with rings needing extra clearance around a setting, but for most day-to-day ring work, smooth is the more practical choice.

Why Choose

Why Choose Our Stainless Steel Un-Grooved Ring Mandrel – US 0–16 & UK A–6

A wide US sizing range. Running US 0 through 16 means one mandrel covers everyday sizing, forming, and repair work whether the ring in front of you is small and delicate or a heavier, larger band.

💍
UK A–6 sizing built in
Having both US and UK scales on the same shaft is genuinely useful the moment a customer or supplier gives you a size in a system you don't usually reference — no second mandrel required.
✨
Smooth, un-grooved surface
No groove running down the shaft means a clean surface for measuring, forming, rounding, and straightening — the setup most general ring work actually calls for.
🛠️
Solid stainless steel build
It holds up to the repeated measuring and forming that's part of daily bench work, without flexing or wearing the way a lighter-gauge metal would.
⚙️
CNC machined for consistency
Machining the taper on a CNC machine keeps the sizing areas accurate and consistent along the full 14-inch length, rather than relying on hand-finishing that can drift from one mandrel to the next.
✦
Deep, laser-marked sizing
The size references are cut deep and dark, so you can find the right US or UK mark at a glance instead of stopping to squint at a faded number.
⭐
Smooth, shiny finish
A polished shaft lets rings glide smoothly during sizing and forming instead of catching or sticking partway down.

Frequently Asked Questions

Get answers to common questions about our products and services