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Learn HKD linear ball bearing specs, selection criteria, installation tips and South Africa sourcing notes for makers, engineers and students.
Bore size, dynamic/static loads, clearance/preload and max linear speed.
Shaft hardness, straightness and alignment are critical for life.
Check Communica branch stock, lead times and choose sealed types for dusty sites.
HKD linear ball bearings are rolling-element linear bearings that allow low-friction motion along a hardened shaft or rail. They combine recirculating steel balls within a cage or cartridge to provide smooth, repeatable linear travel with relatively high accuracy and low friction compared to plain bushings. Typical applications include CNC axes, 3D printer rails, pick-and-place stages, linear actuators, and automation slides.
When comparing HKD linear ball bearing specifications, the common datasheet items you will see are listed below. Understanding each lets you match a bearing to load, travel speed and environmental needs.
| Specification | What it means |
|---|---|
| Inner bore diameter | Shaft diameter the bearing is made to run on (e.g., 8 mm, 12 mm, 16 mm). |
| Static load rating | Maximum load without permanent deformation when stationary. |
| Dynamic load rating | Load rating used to estimate service life under motion. |
| Radial and axial load capacity | Direction-dependent capacities; vital for side loads and thrusts. |
| Running clearance / preload | Internal clearance affects play, stiffness and friction. |
| Max recommended linear speed | Upper limit for smooth operation; expressed in mm/s or m/min. |
| Shaft hardness & finish | Requires hardened steel (e.g., 58 HRC) and specific surface finish for long life. |
Note: HKD is used here as the product family name. Check the manufacturer's datasheet for exact numeric values before final selection. Local availability and lead times in South Africa affect practical choices for replacement and prototyping.
Convert rotary speed to linear velocity for shaft-mounted systems: if a shaft of diameter d (mm) rotates at n RPM, the peripheral linear speed v (mm/s) is approximately:
v = (pi * d * n) / 60
Use this when a bearing datasheet quotes maximum mm/s and you need to check motor/drive selections. For example, a 12 mm shaft at 3000 RPM gives v ~ (3.1416 * 12 * 3000) / 60 ~ 1885 mm/s (1.885 m/s). how to choose linear ball bearings for 3D printers
Example 1 - Load check: If a carriage carries a 8 kg payload and the gravity load is vertical, convert to Newtons for bearing selection: F = m * g ~ 8 kg * 9.81 m/s2 ~ 78.5 N. Add friction and acceleration loads when sizing dynamic capacity.
Example 2 - Speed compatibility: If a datasheet lists a maximum linear speed of 2 m/s and your mechanism will move 1.5 m/s continuous with short bursts to 2.2 m/s, choose a bearing rated for continuous 2 m/s and with a margin for bursts or select a higher-rated series.
Stock and lead times can influence whether you pick a standard bore size or adapt with shims/spacers. Communica stocks many mechanical components and maker supplies; for urgent repairs check branch availability in Samrand, Pretoria CBD, or Cape Town. For education and prototyping, choose robust, forgiving shaft and bearing combinations that tolerate classroom handling; for production, prioritise hardened shafts and preloaded systems.
| Series / Type | Bore (mm) | Typical max speed (m/s) | Sealing |
|---|---|---|---|
| Open cartridge | 6,8,10,12 | 0.5 - 2 | None (requires external seals) |
| Sealed / shielded | 8,12,16,20 | 1 - 3 | Rubber seals or metal shields |
| Flanged housing | 12 - 30 | 0.5 - 2.5 | Depends on cartridge |
Free shipping for orders over ZAR 1,000.00.
Get a full refund if you had the product for less than 7 days.
Nationwide delivery within 2 - 4 working days.
Communica supplies semiconductors and electronic components to industries such as automotive, electrical, automation, mining, and education.
Disclaimer: This content is for educational purposes only. Product availability, pricing, and specifications are subject to change. Always verify current details on the retailer's website before making a purchase. We may earn affiliate commissions from qualifying purchases.
Review for Communica Samrand Security Wanted to share a heartfelt thank you to the security team at Communica Samrand! Yesterday, I had a personal ex...
Quick service from Layla and her team in providing technical assistance and getting my order together. This is the best service I have received in a l...
I love this place and have been purchasing my electronic parts over 25 years . Layla has been a super sales lady ..friendly and knows her products .
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Needed help with network cameras and cables - Salesperson was extremely knowledgable and very friendly!! Helped me quickly - then the Technician even ...
Wide range of products, excellent service and friendly staff. Well informed and Layla also informed me on compatibility of the components I was about ...
I have a weird project with weird stuff I needed and Cynthia was super helpful and patient with me searching and deciding on what to get. Awesome serv...
I really recommend communica and the establishment has the best coffee house and the food is amazing
Verified customerI have been buying from Communica for many years now, since they were originally situated in Mooi street in Braamfontein. In general they have friendl...
Thy have a wide range of components. Thy do have a q to wait in but 1 come 1 serve. But while you wait thy have very cool stuff to look at you will al...
From warm welcome by the security check when you enter the store to sales man, then all the way to ladies behind the counter, one of them even organi...
Excellent service from Mpho, so friendly and knowledgeable on the products I required. Thanks Communica.
Verified customerGreat service, nice selection of spares, knowledgeable staff
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Verified customerVery pleased with the service from layla and nicole they were extremely helpful and full of smiles... Thank you ladies keep those bright spirits shini...
Very good and friendly service from the sales reps running around to the counter. Willing to help with any problem. Highly recommend.
Verified customerThe service was really good and the staff is helpful. Thank you
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Verified customerAny electronic parts available, chargers, batteries, camera and security stuff and mega big store. One of my favorite places to go with helpfull frien...
Visited a couple of times for supplies and specialised parts Staff is extremely friendly and always helpfull
Verified customerRose helped me so much today Great service
Verified customerExcellent customer service all the way! Amazing, welcoming and energetic staff, especially Steven, Sydney and Nicole. This company is the gold standar...
Awesome service from Sydney and Nicole...keep up the great job guys
Verified customerwhat a great experience i was helped with very efficient and friendly service going the extra mile to get the correct part and save money
Verified customerWell organised store, excellent system of service and short waiting period. Staff (Nicole) was very helpful and passionate about the company, it very ...
What an absolute gem Layla is! She went out of her way to source my requested items from another branch, without me asking, and done so with a great b...
I was assisted by Fatima. She was friendly, patient and professional. Thanks for the great service!
Verified customerGreat service. Cynthia has great knowledge of product and very friendly and helpful
Verified customerAwesome assistance experience I was given, thumbs up
Verified customerWide selection of electronics including many connectors. Very helpful.
Verified customerWent there replace parts we bought that were incorrect. They gave me hustle. Was so smooth that I ended up even buying more stuff.
Verified customerYou nake an order and you collect. Service done is professional and the people starting with the security guard to the administration is great.
Verified customerI had a fantastic experience at Communica, thanks to the exceptional service provided by Rehaan in sales and Nicole at the cashier. Rehaan was incredi...
Got assisted by a very patient and diligent gentleman by the name Sydney. He was patient in getting me what I needed from the little information I gav...
The kind gentleman right behind the turnstiles at the entrance sales counter helped me immediately as I walked in, Sydney, I think. I needed 8 packs o...
Rehaan was very helpful. He walked woth me through the store and assisted me to get all the items I needed. He also referred me to places that could h...
Amazing services Rehaan is the best, just ask for him. Just excellent service. You may end up buying more things than you had planned though. But it ...
I had a fantastic experience with Communica. Whenever I need electronics on short notice, their sales and logistics team always goes the extra mile to...
Can i give Fatima her flowers.... 10 000 out of 100. Customer service-100% Patience-100% Product knowledge-100% Had the best shopping experience there...
Leila was very helpful and super nice!
Verified customerThanks for you friendly and good service...
Verified customerSydney and Windie was extremely helpful and I received very quick service
Verified customerGood service good people great customer care never disappoint me when I'm looking for anything in need always smiling and welcoming...this time when I...
Puleng and Nicole gave me awesome and friendly service
Verified customerWonderful service from nicole at communica samrand
Verified customerMy special appreciation to Windie, with her super customer service. Keep up the good work my sister. Individuals like you gives us more peace to retur...
Fatima was very helpful and patient with my many queries. The shop itself has seen better days but the service was great.
Verified customerFantastic service and help received by Nicole. Communica in general has amazing range of products and solutions to meet my business and personal needs...
Great experience with every purchase thanks to Sydney and nicole
Verified customerAfter searching for a product on the net, Communica was one of several hundred suppliers found. I couldn't be more pleased with my decision to choose...
Sydney was an awesome help, he approached as we walked in for assistance. Nicole was such a darling and very helpful as well. Awesome first time exper...
Ordered online, was just after 6am. Asked if I can pick items up as I wanted to install over the weekend and delivery stated 2-4 working days. Though...
Online support and communication is next level - great communication, fast response - very helpfull, recomended supplier - online payment was no hasse...
He's polite, good with people and made me feel free to talk.. all in all he's helpful
Verified customerAt the till we met Nicole, First of her name! The rightful heir to the iron throne! the Unburnt, Breaker of Chains and pillar of strength at Communic...
Rehaan was the sales representative that helped us. He was friendly and helped us with in seconds. We where very pleased with the service and the expe...
I purchased the TP-LINK VIGI C340 4MM camera online... What an amazing camera. Easy to setup with long distance view, and superb quality. This was an ...
Best service received from Rocket! What a pleasure dealing with him. Thank you Rocket
Verified customerFast good price service. Thank you Sydney.
Verified customerThanks Fatima for an excellent service
Verified customerOnline service is extremely great.. Had an amazing chat with one of the online chat consultants. Gave me info I needed, and we talked about my passion...
Excellent service so far
Verified customerSydney offered exceptional service. He took me step by step on what I needed to buy. Thank you Nicole for the service
Verified customerLovely lady serving me named Nicole and I got very good assistance from Leburu on th floor whom directed me toward the correct goods. Will visit again...
Excellent service by Sydney at the ino counter. So many awsome products! Perfect place to buy gifts for tech junky friends.
Verified customerGreat customer care, with Nicole in the front Desk, the team is fully on the customer support gear, really appreciate your smile Team, Ola.
Verified customerI met Leburu and Nicole at the shop, Leburu took me to the right place with a great smile, then took me with my stuff to cashier Nicole where I paid a...
Leburu and nicole were both very helpful my boss send me to get few items as I wasn't very familiar with the items Leburu and my boss spoke with each ...
Sydney and Nicole were amazing I came in and finished within no time thank you so much keep up the friendly service
Verified customerCustomer service is excellent. Thank you to Mpho for helping me get what I need from the store
Verified customerI will rate the service 5 star. Layla was incredibly friendly and helpful, assisting me with finding the items I needed.
Verified customerThe service I always get from Sydney And Lacy the Cashier is amazing. Those are my guys...keep up the good works gentlemen.
Verified customerOrdered online. Got my order in less than 24 hrs. I was updated all the time on the progress. I have never seen service like this. Thanks and well don...
Sydney and Nicole were absolutely fantastic and helped me with my purchases. Thank you.
Verified customerLovely service received from nicole at the cashier point....it was my first time here and i will be back for certain
Verified customerAwesome service, very friendly and helpful people. Best help and assistance from Avi, and such lovely chats with Nicole.
Verified customerAn awesome shop for everything electronic, at great prices. The team at the returns counter are super helpful and friendly and we love this shop!
Verified customerUnbelievable!! It is now Saturday evening 23 December - 21:15 - and just finished online assistance from Communica - this is service I am not used to ...
Needed to buy a bluetooth GPS receiver. The staff was friendly, knowledgeable and assisted without any issues. This is a toys tore of note for peopl...
azul and Nicole were very helpful and very efficient
Verified customerCynthia at the counter is always very helpful, in fact, all the counter sales ladies are very helpful. Can't say the same for the staff when calling ...
They have mostly any electronic tool and components that you may require - Thanks to Nicole for helping me.
Verified customerVery helpful and really do know their stuff and incredible service absolutely amazing store.
Verified customerFatima is the best. She has great product knowledge.
Verified customerExceptional Service! Online shopping is always a breeze and products delivered on time!
Verified customerGreat service received from Nicole...thank you young lady keep up the good work
Verified customerAfter spending 2 days hunting for a component i found it here. Dealt with someone telefonically. Help was quick, answered all questions, and called me...
One of the cashier services rendered to me was here at communica by the lady named Nicole and her manager dolly they were both willing to go above and...
The service was excellent, Nicole and Rehaan were very helpful and professional in their work.
Verified customerExcellent efficient service with quality products. Despatch process and the counter sales are exceptionally well
Verified customerThank you Rehaan and Nicole for your great service. You made sure that I'm satisfied with the products. Thank you
Verified customerAfzal and Nicole offered me the most exceptional service thank you guys keep up the good work will definitely be seeing more of communica
Verified customerHi Guys. Fantastic place to come to. Very friendly staff. Thank you Nicolle, Mpho and Lacy
Verified customerOnline order shipped before email system had chance to catch up! Good support on chat function. fantastic service
Verified customerNicole assisted me quickly with the correct product. Friendly service thank you!
Verified customerThe service was great and Nicole helped me alot. I will definitely come back
Verified customerService received from Nicole and Dolly was extremely good will definitely be coming back
Verified customerReceived exceptional service. They were quick to answer my website enquiry. Then they went out of their way to make up a special industrial automatio...
Great service, Rehaan and Layla were spectacular with assistance. 10/10 Would definitely recommend.
Verified customerExcellent service from Windie and Mokgabo,they were very friendly and much of a help.Will definitely visit again
Verified customerArrived and the item i wanted was sold out! Rose assisted me and went out of her way to help me get me the goods! 10/10 customer service!
Verified customerBest place for all your electronics needs. Great service, awesome people, Thanks Nicole
Verified customerFriendly and efficient. Good to have staff with such an aptitude and attitude
Verified customerAwesome place!! They have everything electronics you would ever require cctv, home automation and DIY.Prices are decent and staff are helpful. They ha...
Mohamed Sharief is a great asset to Communica. He provides a 5 star service and good product knowledge. Keep up the good work.
Verified customerThis is the answer to all your electronics equipment needs, they have all the components you require for your school project. The shop is very big and...
I received a great service from Rehaan, Windy and Nocole. Excellent customer service.
Verified customerVery good service. Always happy to help me. Thank you Nicole.
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Verified customerNicole serves with great enthusiasm and super friendliness. Great Customer Service.
Verified customerREHAAN and Nicole are extremely helpful and friendly people made my experience at communica a breeze to shop. Thank you again for the help.
Verified customerSydney and Windie are awesome, what a great experience... keep them part of the Communica team for as long as you can
Verified customerExcellent service from nicole,Rehman and leburu...thank you guys keep up the good work
Verified customerI was helped by a lovely lady at the counter Cynthia and proceeded to another lovely lady at the till point Nicole thank you ladies
Verified customerThe service is so exceptional, thanks to the stuff members in particular Lulu and Nicole
Verified customerReceived excellent service as always from Communica, placed an order yesterday for a new Multimeter and was delivered today at 10am, goods were sent f...
Quick quality customer service.
Verified customerGreat experiance and fast service. Nicole assited me in everything I required.
Verified customerCynthia was very very helpful.
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Good range of products. Excellent customer service from Nicole.
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Leburu excellent and friendly efficient service. Worth 10 Stars Nicole friendly and effective
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I'm very impressed with Nicole the best service ever
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Verified customerI love this shop, it is an electronics dream! The service is typically poor though, and they have a confusing ticketing machine to get attention. Howe...
Very good service and a happy welcoming smile from the cashier Nicole
Verified customerWide variety of stock. Anil Arnachellan helped us and kept us updated on products we ordered. He made it a pleasant experience to deal with Communica!
Verified customerOnline service was perfect, after hours enquiry at night and was assisted immediately. Good job guys!
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Verified customerNicole , excellent service, first time to visit.
Verified customerReceived good service Nicole and Cynhtia thanks you so much
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Verified customerLovely service received from Nicole thank you lady
Verified customerA world of electronics under one roof!! Vast range of products with knowledgable staff adding to the shopping experience and at competitive prices!! D...
Anyone that seriously loves technology ought to spend time here. They definitely have what you want. Best tech store!
Verified customerGreat service from afzal and Nicole thank you guys
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Verified customerPuling and Nicole gave me a best service. P
Verified customerFatima & Nicole delivered an excellent customer service
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Verified customerNicole was welcoming.. Good service.thanks
Verified customerMpho was very help full. Great service
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Verified customerHappy with the service received from Afzal and Nicole
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Verified customerMpho helped us quickly and with knowledge Excellent
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Verified customerVery good service from Nicole
Verified customerPatient and kind
Verified customerThanks for the quick help Sidney and Nicole.
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Verified customerGreat service by Sydney and Nicole
Verified customerCHAT RESPONSE TIME DEFINITELY WAY ABOVE GENERAL AVERAGE, WELL DONE.
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Verified customerAlways very good service
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Verified customerGreat service as always
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Verified customerMy electronics go to place
Verified customerGreat service
Verified customerSydney en Lacy was baie hulpvaardig. Goeie diens!
Verified customerNicolene
Verified customerGreat place to purchase electronic components at a fair price. They have a wide range of products and a well functioning ticketing system that ensures...
After being supplied the incorrect track for my garage motor, despite me asking twice if it was the correct track, I had to return to the store to exc...
They have most every electronics component you might need. Staff are knowledgeable and friendly. I was looking for a bespoke miniature item for a lapt...
Great service as always from Nicole and Sydney especially Mpho at the sales desk
Verified customerGood Array of products and sound advice
Verified customerGreat inventory. Very slow service, though the staff seem to do their best. Single till open mostly with overbearing security measures. Can do with so...
I visit Communica once in a blue moon. Always wish i have more time to look at everything. Good & friendly service. Nothing wrong with a queuing syste...
Currently have only purchased items from their on-line store. Received what I ordered plus quick delivery. No complaints to date.
Verified customerThe new ticketing system is great, but the queues are still exceedingly long, and there are hardly any staff on hand in the shop to assist with questi...
I needed a heat-sensitive diode as one of my Philips appliances had had a failure. Philips wants you to throw the entire thing away, but I tried look...
I got the most pleasant service from Sydney and Windie
Verified customerExcellent range of items, with technical staff that know their stuff. Unfortunate location that makes it a bit difficult to get to, but worth the tre...
Wide range of electronic components. Very likely to find what you are looking for. Arthur was very helpful. Don't bother trying to call for informatio...
Great place. Reasonable prices. Keeps component level items as well as security, surveillance and electrical items and tools
Verified customerI had some electronic work to be done.Personell very friendly and helpful .Topclass business
Verified customerElectronic supply store if you like tinkering it's got the goods the tills are slow so don't expect a in and out visit especially if there is two or m...
Great pricing and a wide variety of products to choose from. A must visit if you've ever been to the Pretoria branch.
Verified customerNicole was very helpfull and friendly.
Verified customerGood job Nicole! Well done!
Verified customerSlowest service ever! Even worst cashiers. I shudder to go. Good products though.
Verified customerGood service, would recommend.
Verified customerWide range of electronics for the diy enthusiastic, ranging from solar systems to alarms and cctv.
Verified customerGreat for electronics but stock is a problem quite often so call before going through.
Verified customerService has improved but still a long way to go to actually sort it out.
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Verified customerThe is a computerised quing system and you can pick n pay....but the problem is the is no lift and the only way to get up is using steps
Verified customerFor Sonoff ewelink WiFi switch.
Verified customerThank you for your patience ma'am Mpho
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Verified customerSomethings are getting pricey, but still a good place to pick up components
Verified customerNicole and Sydney were very helpful
Verified customerElectronic store for DIY electronics and prototyping guys. Doesn't look all that great but should have what you're looking for.
Verified customerA good electrical/electronic sales store packed with almost every component you require
Verified customerIf you love engineering you'll love this shop apart from the terrible queues and long waiting times
Verified customerAlmost all electronic spares available at reasonable prices.
Verified customerVery fast and friendly service, avoid it in friday afternoon if possible.
Verified customerExcellent, ask for Sydney. Solved immediately
Verified customerThey have everything you would need. Service is good
Verified customerBig electronic component shop. Counter can be very busy. Lots of parking.
Verified customerClose to closing time so i was in and out quickly
Verified customerAll the goodies in one place and Mohamed is always willing to help
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Verified customerVery helpfull. Thank you
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Verified customerExcellent service Nicole
Verified customerLarge selection, low on staff during lunch time when they are busy.
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Verified customerDefinitely will have what you're looking for.
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Verified customergood selection of electronic supplies accessible
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Verified customerLarge number of electronic components
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Verified customerWaiting time can be annoing.
Verified customerGet answers to common questions about Robotics And Prototyping
