Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

THOMSON Profile Ball Rail: 20, 820 mm Overall Lg, 20 mm Overall Wd, 19 mm Overall Ht - Thomson 500 Series Ball Profile Rails
THOMSONThomson 500 Series Ball Profile Rails

THOMSON Profile Ball Rail: 20, 820 mm Overall Lg, 20 mm Overall Wd, 19 mm Overall Ht

The Thomson 500 Series Profile Ball Rail (SKU 3G-OTH-123047) is a linear motion component with a nominal rail size of 20. This steel rail measures 820 mm in overall length, 20 mm in overall width, and 19 mm in…

SKU 3G-OTH-123047

Also listed as: 521H20A820 · 521H20A 820 · 521H20A-820

Brand
THOMSON
Item
Profile Ball Rail: 20, 820 mm Overall Lg, 20 mm Overall Wd, 19 mm Overall Ht
Category
Thomson 500 Series Ball Profile Rails
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

THOMSON
Manufacturer Part Number
521H20A+820
Type
Steel
Overall Lg
820 mm
Size
20
Overall Ht
19 mm
Overall Wd
20 mm
Rail Holes
6
Nominal Rail Size
20

Technical Documents

No technical documents available for this product.
Request documentation
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

THOMSON Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The Thomson 500 Series Profile Ball Rail (SKU 3G-OTH-123047) is a linear motion component with a nominal rail size of 20. This steel rail measures 820 mm in overall length, 20 mm in overall width, and 19 mm in overall height, featuring 6 rail holes. It is identified by manufacturer part number 521H20A+820.

Frequently Asked Questions

What is the Thomson 500 Series Profile Ball Rail used for?

The Thomson 500 Series Profile Ball Rail is a linear motion component used in automation, packaging, and material handling systems. It guides and supports moving parts along a precise path, ensuring smooth, low-friction travel for machine slides, gantries, and robotic axes.

What are the specifications of the Thomson 521H20A+820 ball rail?

The Thomson 521H20A+820 is a steel profile ball rail with nominal size 20. It measures 820 mm overall length, 20 mm overall width, and 19 mm overall height, with 6 rail holes. This rail is part of the Thomson 500 Series and is designed for linear motion applications.

Where to buy Thomson profile ball rails worldwide?

You can source Thomson profile ball rails worldwide through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead time on the Thomson 521H20A+820 or other linear motion components.

How to install a Thomson profile ball rail?

To install a Thomson profile ball rail, first ensure the mounting surface is clean and flat. Align the rail with the machine base, then secure it using the rail holes with appropriate bolts. Use a torque wrench to tighten fasteners to the manufacturer's recommended values. Check alignment with a straightedge before finalizing.

Used in

Common applications for THOMSON
Industrial automation — Thomson 500 Series ball carriages (511H25C0D) used in linear motion axes for pick-and-place systems.
Packaging machinery — Thomson profile ball rails (521H30AD+1000) guide conveyor or carton-erecting mechanisms.
Material handling — Thomson linear ball bearings (SUPER32OPN) support sliding loads in transfer stations.
Machine tool — Thomson ball nut end blocks (7829547) integrate with ball screws for CNC table positioning.
Medical equipment — Thomson pre-drilled shaft support rails (LSR-10-PD) mount linear guides in diagnostic scanners.
Automated assembly — Thomson double-acting seals (OPNS1000) protect linear bearings in dusty environments.

THOMSON Products

3G Electric supplies THOMSON thomson 500 series ball profile rails. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion Pumps & Compressors Spare Parts All Products

Compatible alternatives & equivalents

Cross-referenced by specification & description
Profile Ball Rail: 20, 1,240 mm Overall Lg, 20 mm Overall Wd, 19 mm Overall Ht, Steel, 6 Rail Holes (MPN 521H20A+1240)
THOMSON
Profile Ball Rail: 20, 1,240 mm Overall Lg, 20 mm Overall Wd, 19 mm Overall Ht, Steel, 6 Rail Holes (MPN 521H20A+1240)
Profile Ball Rail: 20, 1,000 mm Overall Lg, 20 mm Overall Wd, 19 mm Overall Ht, Steel, 6 Rail Holes (MPN 521H20A+1000)
THOMSON
Profile Ball Rail: 20, 1,000 mm Overall Lg, 20 mm Overall Wd, 19 mm Overall Ht, Steel, 6 Rail Holes (MPN 521H20A+1000)
Profile Ball Rail: 20, 220 mm Overall Lg, 20 mm Overall Wd, 19 mm Overall Ht, Steel, 6 Rail Holes (MPN 521H20A+220)
THOMSON
Profile Ball Rail: 20, 220 mm Overall Lg, 20 mm Overall Wd, 19 mm Overall Ht, Steel, 6 Rail Holes (MPN 521H20A+220)
Profile Ball Rail: 20, 3,000 mm Overall Lg, 20 mm Overall Wd, 19 mm Overall Ht, Steel, 6 Rail Holes (MPN 521H20ARL3000)
THOMSON
Profile Ball Rail: 20, 3,000 mm Overall Lg, 20 mm Overall Wd, 19 mm Overall Ht, Steel, 6 Rail Holes (MPN 521H20ARL3000)
Profile Ball Rail: 20, 340 mm Overall Lg, 20 mm Overall Wd, 19 mm Overall Ht, Steel, 6 Rail Holes (MPN 521H20A+340)
THOMSON
Profile Ball Rail: 20, 340 mm Overall Lg, 20 mm Overall Wd, 19 mm Overall Ht, Steel, 6 Rail Holes (MPN 521H20A+340)
Profile Ball Rail: 20, 460 mm Overall Lg, 20 mm Overall Wd, 19 mm Overall Ht, Steel, 6 Rail Holes (MPN 521H20A+460)
THOMSON
Profile Ball Rail: 20, 460 mm Overall Lg, 20 mm Overall Wd, 19 mm Overall Ht, Steel, 6 Rail Holes (MPN 521H20A+460)

More from THOMSON

View all THOMSON parts
Profile Ball Rail: 25, 220 mm Overall Lg, 23 mm Overall Wd, 22.7 mm Overall Ht, Steel, 6 Rail Holes (MPN 521H25A+220)
THOMSON
Profile Ball Rail: 25, 220 mm Overall Lg, 23 mm Overall Wd, 22.7 mm Overall Ht, Steel, 6 Rail Holes (MPN 521H25A+220)
Profile Ball Rail: 45, 570 mm Overall Lg, 45 mm Overall Wd, 37 mm Overall Ht, Steel, 6 Rail Holes (MPN 521H45A+570)
THOMSON
Profile Ball Rail: 45, 570 mm Overall Lg, 45 mm Overall Wd, 37 mm Overall Ht, Steel, 6 Rail Holes (MPN 521H45A+570)
Profile Ball Rail: 35, 1,640 mm Overall Lg, 34 mm Overall Wd, 29.5 mm Overall Ht, Steel (MPN 521H35A+1640)
THOMSON
Profile Ball Rail: 35, 1,640 mm Overall Lg, 34 mm Overall Wd, 29.5 mm Overall Ht, Steel (MPN 521H35A+1640)
Profile Ball Rail: 15, 1,000 mm Overall Lg, 15 mm Overall Wd, 15.7 mm Overall Ht, Steel (MPN 521H15AD+1000)
THOMSON
Profile Ball Rail: 15, 1,000 mm Overall Lg, 15 mm Overall Wd, 15.7 mm Overall Ht, Steel (MPN 521H15AD+1000)
Profile Ball Rail: 15, 1,500 mm Overall Lg, 15 mm Overall Wd, 15.7 mm Overall Ht, Steel (MPN 521H15ARL1500)
THOMSON
Profile Ball Rail: 15, 1,500 mm Overall Lg, 15 mm Overall Wd, 15.7 mm Overall Ht, Steel (MPN 521H15ARL1500)
Profile Ball Rail: 20, 160 mm Overall Lg, 20 mm Overall Wd, 19 mm Overall Ht, Steel, 6 Rail Holes (MPN 521H20A+160)
THOMSON
Profile Ball Rail: 20, 160 mm Overall Lg, 20 mm Overall Wd, 19 mm Overall Ht, Steel, 6 Rail Holes (MPN 521H20A+160)
Profile Ball Rail: 20, 280 mm Overall Lg, 20 mm Overall Wd, 19 mm Overall Ht, Steel, 6 Rail Holes (MPN 521H20A+280)
THOMSON
Profile Ball Rail: 20, 280 mm Overall Lg, 20 mm Overall Wd, 19 mm Overall Ht, Steel, 6 Rail Holes (MPN 521H20A+280)
Profile Ball Rail: 25, 1,000 mm Overall Lg, 23 mm Overall Wd, 22.7 mm Overall Ht, Steel (MPN 521H25AD+1000)
THOMSON
Profile Ball Rail: 25, 1,000 mm Overall Lg, 23 mm Overall Wd, 22.7 mm Overall Ht, Steel (MPN 521H25AD+1000)