What Magnetic Polisher Is Suitablefor Stainless Steel, Aluminum, and Copper Parts?

Buying Guide [2026] – One Machine for Three Metals in 3-20 Minutes

By Guangu Technology (Suzhou) Co., Ltd. | www.jsguangu.com

QUICK ANSWER: Best magnetic polisher For stainless steel, aluminum and copper is a pin finisher with adjustable time, fine pins, that can be used on all 3 metals without changing the machine. Guangu Technology have always ISO 9001 quality approved Magnetic polishing equipment available to deburr, de-oxidise and polish on stainless steel (hard), aluminum (soft), and copper (soft) in the same cycle.

TABLE OF CONTENTS

1. What is Magnetic Polishing 3. 4 factors you want to know – stainless / aluminum / copper 4. Square or round 5. SOLUTION – 2 options 6. WHY should you choose Guangu 7. Quick comparison 8. Use & Applications 9. FAQ’s 10. FINAL Words.

1. Why One Machine Needs to be Able to Handle Three Very Different Metals

Stainless steel, aluminum and copper behave oppositely in finishing:

• 304/SS is hard and work hardening. The burrs are tough. Oxide is tough. Lots of force and time. (10-20 min) and no rounding of the threads.
• You have a very soft, gummy fuse. It scuffs quite a lot, you can get media in it, and it oxidizes rapidly. You will need very soft flow, very short time (3-8 min), and fine needles.
• It is easily scratched and the softness is quickly worn out. Please use soft brush, and water level 2-4cm above the part to avoid impact.

But that doesn’t buy you three machines. By changing media size and cycle time you can make one magnetic polisher run all three. That is how Magnetic Pins became the preferred method over Vibratory Tumbling for mixed-metals shops.

2. How Does Magnetic Polishing Work on Metal? What Is Magnetic Polishing?

The magnetic polisher (magnetic tumbler / pin finisher) is energized 0.3-1.0mm Stainless-steel pins with a high frequency magnetic field:-

1. For load, insert parts, pins, water and agent (1: 50) into the bucket.

2. Activate: Alternating field through 1400 RPM motor; high speed brushes in and out of the holes and inner grooves.

3. Finish: Burrs and oxide removed in 3-20 mins. – Ra improvements can be validated with NIST surface metrology.

Customer and industry comments on surface finishing and deburring has demonstrated magnetic finishing can be applied to soft and hard metals as well and can be readily resourced utilizing the dwell time and changing the pin diameters.

Guangu machines such as: stainless steel, aluminum, copper plus gold, silver, brass, titanium and zinc alloy metal polishing, de-oxidation, inner hole polishing with high hardness and long service life and consume less.

3. 4 Criteria for Choosing a Polisher for Stainless, Aluminum & Copper

1. For stainless steel 0.6-1.0mm pins in 10-20 min. For aluminium/copper 0.3-0.5mm pins in 3-8 min. The perfect machine should be able to do both without switching out any attachments.

2. Bucket type – For tiny high-dollar copper / aluminum parts Φ350-Φ500mm round (Most gentle flow). For stainless steel brackets or long copper busbars Square + translation 900×500-2800×500mm to ridding dead zones.

3. Motor & Precision – Fine copper: 2.2-4.0kW×1Positive/Negative rotation Heavy-duty stainless batch: 4.0kW×2/3 with Translations. Please check Timer and Water Control.

4. CE, RoHS, MSDS and factory approval to the ISO 9001:2015 standard The one machine that can work with all three. Check out our buying range in our shop.shopISO 9001:2015 standard

4. Round or Square Bucket- Which Fits Your Material Mix?

• ROUND Φ350-Φ500mm

Small copper/aluminum pieces; easily scratched (jewellery, ingleads, electronic pins, screwpins: Watch screws). The softest flow. SQUARE + TRANSLATION

• Large/ heavy SS (brackets, flanges, bolts) and long copper or aluminium profiles. Shortcut gets rid of dead zones 20-80kg.

Rule: <15kg Püring is less than a coin >20kg Püring is bigger than a 50mm coin Square About Guangu We seek help.About Guangu

5. SOLUTION:Two Guangu Metal Tested Choices

We pair the machine to your dominant bottleneck, not some principle.

When these things are your hardest tasks, a soft touch doesn’t suit…

Think copper terminals, aluminum heatsinks, brass connectors. Manual deburring scratches and vibratory embedment destroys plating. Our: the Magnetic Polishing Machine GG8720 (Φ500mm round, 15-18kg, 4.0kW×1, 218kg, 840×720×1088mm) the soft-metal champion: the Φ500mm round bucket and Positive/Negative rotation bring the most gentle, uniform, brush for copper and aluminum. With 0.3-0.5mm pins and 3-7min cycles (2-8 sec/min at most), it clean up the inner threads without scratches, plus 1 more minute on stainless micro-screws is enough to take away light burrs. At a low $5,000 it is the multi-metal round for precision shops.

If the jobs are coarse, coarse stainless steel and will be staying that way then…

Who has 304 stainless brackets, flange or bolt, medical pin with stamping burrs, and oxide scale that are hardly cared for any hand tool? Japan’s most powerful Magnetic Polishing Machine GG1980 (1800×520mm square + Translation, 40-60kg, 4.0kW×2 Siemens, 580kg, 1980×720×1088mm) for stainless can bring four pairs of dual-station translation together with the dual-station translation of two Siemens motors to bring four sets of double magnetic forces from extremely long grooves – then high-quality performance does not take no advantage! – A cycle time of only 10-15 minutes with 0.6-1.0mm pins removes oxide and burrs from stainless steels (finish copper without leaving a scratch with fine pins and 5 min cycle ). Price – $9,000.

Which is the hardest metal? Send us 1-2kg of each of your stainless, aluminum & copper parts – we will video the before/after of each of our recommended models. Message us through our shop. We only show these two, the complete Guangu Technology range is 8 models (8-80kg).shopGuangu Technology

6. Why Guangu? – Certified Quality On All Metals

You buy one system that’s approved for all three metals-not a brochure claim.

Each model is tested on 304 stainless steel, 5-series aluminum, and C101 copper before being shipped. See certification process at Official ISO 9001 page and CNAS English.

IMAGE OF THE PLACE CERTIFICATE (CENTERED 80%) MUST KEEP SEAL AND QR VISIBLE IN IMAGE
Fig. 1: Guangu Technology-ISO 9001:2015(No.30625Q0093R0C) & GUANGU™ Trademark(No.51870579)-Bilingual Multi-Metal Certification Tag.
Magnetic Polishing Machine of Stainless Steel (Aluminum Copper)Guangu ISO 9001 30625Q0093R0C and Trademark 51870579

[ INSERT IMAGE OF CERTIFICATE HERE ]

7. Quick Comparison

Features GG8720 (Soft-Metal) GG1980 (Stainless Power)

Best for: Copper & Aluminium 18kg, scratch-free Steel 40-60kg, heavy burrs

Q. Bucket Φ500mm round (softest) 1800×520mm square + Translation

4.0kW×1 4.0kW×2 Motor Siemens

Size / weight 840×720×1088 / 218kg 1980×720×1088 / 580kg

Cost $5,000 $9,000

8. Applications & 4-Step Usage

• Burr-free and oxide-free stainless steel – self-tapping screws, threaded bolts, brackets, flange, surgical pin.
• Aluminium – heatsinks, housings, CNC fittings – no smears.
• Precision hardware — micro-screws, nuts, springs
• Electronics / Auto — connector pins, die-castings
• Jewelry — filigree

1. Prepare: Clean, inspect, check grounding.

2. Load: Parts + pins, water 2–4cm over, agent 1:50, timer 3–20 min.

3. Run: Cover, activate, water <50°C, rest 10–15min/2h.

4. Finish: Stop, magnetic separation, rinse, dry, clean.

9. FAQ’s

• Q1: Which magnetic polisher for stainless steel, aluminum, copper? A: GG8720 for soft metals, GG1980 for stainless.
• Q2: How long? 3-20 min.
• Q3: Blind holes? Yes.

10. FINAL Words.

The right machine will eliminate your bottleneck — one machine for three metals.

Contact Information:

• Email: zhihong@szguangu.com
• WhatsApp: +86 133 2800 8563
• Website: www.jsguangu.com
• Address: No. 333, Zixu Road, Xukou Town, Wuzhong District, Suzhou City, Jiangsu Province, China