4x7x2.5mm Metal Shielded Bearings 4mmx7mm (Price Per Bearing MR74ZZ

Description

In
ternational buyers - please read the "International Shipping" section of our listing prior to making your purchase for information on transit times. Please DO NOT select the ECONOMY shipping option if you cannot accept the possible transit times.
Los compradores internacionales
-
por favor lea
la sección "
Envío internacional" de nuestra
lista
antes de hacer
su compra
para obtener información sobre
los tiempos de tránsito
.
Por favor,
no seleccione la
opción de envío
ECONOMÍA
si
usted no puede aceptar
los
posibles
tiempos
de tránsito
.
Les acheteurs internationaux
-
s'il vous plaît
lisez
la section «
Frais de port
international
» de
notre liste
avant de faire
votre achat
pour des informations sur
les temps de transit
.
S'il vous plaît
NE PAS
sélectionner l'option
d'expédition
ECONOMY
si vous
ne pouvez pas accepter
les temps de transit
4 x 7 x 2.5mm
Metal Shielded
Bearings
(priced per bearing)
MR74ZZ
This is a Big Ball Bearings MR74ZZ 4x7x2.5mm Metal Shielded Bearing. Big Ball Bearings offers the best warranty in the business - a full 120 days - so you know they are excellent quality bearings.  This warranty is administered through the retailer (so we will handle any warranty issues for you) The statistics on these bearings, as well as a quick guide on how to choose the right bearings are listed below.
Features:
High Carbon Chrome Steel Construction (Gcr15) For High Durability
Non-Contact Double Metal Shielding Offering Extremely Low Friction  for High Performance, while providing a seal to keep debris out of the bearing.
Inner Bore Diameter Tolerances Accurate to within +/- 0.0002"
Outer Diameter Tolerances Accurate to within +/- 0.0003"
Rated for Maximum RPM up to 63,000 RPM
Maximum Outer Ring Radial Runout 0.0004"
Maximum Inner Ring Radial Runout 0.0002"
WHAT YOU NEED TO KNOW ABOUT BEARINGS:
TYPES OF SEALS:
There are three main types of seals used in Hobby Sized Bearings - Metal Shields, Rubber Seals, and PTFE Seals. The basic function of the seal is twofold - to keep contaminants out and to keep the lubricant in. The three types of seals differ in their sealing ability, how freely they let the bearing spin, and of course cost.
Sealing ability refers to the ability of the seal to keep debris and contaminants out of the inner workings of the bearings. The better the seal, the less often you have to clean your bearings to keep them running smoothly. Failure to clean your bearings when needed will shorten their lifespan. If you want bearings that need very little maintenance, rubber sealed bearings require very little to no attention as they offer the tightest seal.. Metal shielded bearings require the most maintenance.
How Freely the Seal lets the bearing spin is directly related to the performance of the bearings. A rubber sealed bearing offers lower performance than the other types of seals because the rubber seal is actually in contact with the inner workings of the bearing, which results in higher friction as the balls rub against the rubber seals. Metal Shields, PTFE, and Polyamide Seals are "non-contact" as they are held in place away from the inner workings of the bearing. They let the bearing spin easier and offer noticeably higher performance.
Cost is always important in our hobby, and the type of seal does affect the cost of the bearing. The Chart below shows a comparison of the cost of the various bearings. Metal Shielded bearings are the least expensive, while PolyAmide sealed bearings are the most expensive (except for ceramic bearings which can cost you up to 0 for a set).
Ratings
1=Excellent
2=Very Good
3=Good
4=Fair
Sealing Ability
Allows for Bearing to Spin Freely
Affordability
Metal Shields
3
1
1
Rubber Sealed Bearings (Contact)
1
3
2
PTFE Sealed Bearings
1
1
3
PolyAmide Sealed Bearings
1
1
4
SEAL COLOR:
Seal Color is unrelated to bearing quality or performance. It is only used by companies to help build name recognition.
MATERIALS:
There are two major types of materials used in the construction of Hobby Sized bearings - Chrome Steel and Stainless Steel. Both are excellent bearing materials. The main differences between the two are corrosion resistance and cost. Chrome Steel is slightly less expensive than Stainless Steel and will function very well under ordinary use (on or off-road), and under extreme use if properly maintained. If you are running in extreme conditions such as mud, water, or snow, Stainless Steel Bearings will require less maintenance. If you keep your bearings properly lubricated, you will not be able to tell the difference.
TOLERANCES:
Tolerances refer to how closely the moving parts fit together. There is an incorrect assumption about tolerances that started with the Skateboarding crowd that the tighter the tolerance, the better the bearing and the higher performance you will get out of those bearings. This is true to a point - the tolerances on a bearing needs to be tight enough to prevent "wobble" and other performance reducing problems. As tolerances become too tight, however, friction inside the bearing starts to increase and the performance will begin to suffer. You need lubrication and enough space for the bearing to spin freely. The Tolerances in a bearing are described by an ABEC or ISO number. The Higher the ABEC number, the tighter the tolerances. Bearings must reach a certain tolerance level (such as a width to achieve and ABEC rating. We have found that ABEC-1 bearings work well for light use, but ABEC-3 bearings are the best for hard use or racing. We have found that ABEC-5 bearings offer slower lap times. Make sure you ask your seller what for the ratings on their bearings - if they don't know or won't tell you, they are probably selling the cheaper ABEC-1 or even non-ABEC rated bearings.
WARRANTY:
The warranty that covers the bearings is usually a good indicator of the bearing quality. A manufacturer won't want to offer a long warranty if they have inferior bearings. A warranty should replace a bearing in the case of premature failure. If you buy your bearings from an individual working out of their basement or company that does not offer a warranty you may end up with low quality bearings and no recourse for correcting the problem. Always ask what warranty is offered on your bearings.
GENERAL GUIDELINES FOR CHOOSING BEARINGS:
Metal Shielded Bearings:
Metal Shielded bearings offer excellent performance at a budget price. They work very well for on-road racers as they offer excellent performance and are easily maintained to keep them at peak performance. If used in an off-road application, exposed bearings such as wheel bearings will need to be cleaned on a regular basis to keep them running smoothly. (Inexpensive tools are available that makes cleaning easy) These are also excellent bearings in high-temperature applications such as Clutch Bells in Nitro Vehicles.
Rubber Sealed Bearings:
Rubber Sealed Bearings are a nice choice for people who want bearings they can install and not have to worry about cleaning or maintaining them. They are also recommended for running in wet or extremely dirt conditions. Because of the performance loss involved with this kind of seal, they work best for sport use, and amateur racing.
PTFE Sealed Bearings:
PTFE Sealed Bearings are an excellent choice for racers as they offer a combination of high performance and low maintenance. They work very well for both on-road and off-road applications.
PolyAmide Sealed Bearings:
This is a new type of PTFE Sealed Bearing. It offers all the performance of other PTFE Seal Bearings, but includes a Polyamide core seal which offers a sealing ability that rivals rubber sealed bearings for protection from debris. This improved seal also offers greater resistance to heat, and improved lateral strength. Their High performance makes them well suited for both Electric and Nitro Racing Applications, while their maintenance free operation makes them just at home bashing around the backyard.
This item is brand new, sealed in the factory packing, with full manufacturer's warranty.
CONTACTING RCBoyz
If you have any questions about your order or the items we have for sale please E-mail us.  Please note that we are closed on the weekends and holidays so E-mails and payments received after business hours will not be processed until the next business day. If you are not receiving answers to your E-mails, please check your SPAM folder to make sure they are not accidentally being delted by your spam filter.
COMBINED SHIPPING
Save money on your orders with a combined shipping discount! We are more than happy to combine shipping on multiple purchases to save you money on shipping.
We do require that all items must be paid for via a single payment.
This makes it possible to match your items up for shipping, and eliminates the extra fees we get charged when separate payments are made -this allows us to pass the savings on to you.
If separate payments are made, the full shipping charge for each item will apply.
How can you get combined shippng?
1) Add all the items you want into your shopping cart.
Just add everything you want into your shopping cart, then go into your cart and click on the “Request total from seller” link. You need to do this on the ebay US website (www.ebay.com) as international sites may not allow combined shipping. If you are using a cell phone, you will need to use a full internet browser or scroll down to the bottom of the ebay page and select the “ebay classic site”. The mobile site does not offer combined shipping.
2) Have eBay's system can do an automatic combination for you.
EBay's system will charge you full shipping for the item with the most expensive shipping and add an additional amount for each item you add to the order. This works well if all items are heavy, or you only have a few items. If you are buying lots of small items, or items that are very different in size,  you will usually get a much better rate using either option #1 or option #3.
3) You can click "Buy It Now" on all the items you want - but do not pay for them yet.
When ebay asks you to pay, instead just continue shopping. When you have agreed to buy all the items you want, click on the "Request Total from Seller" link on one of the order pages, and wai for us to send you a combined invoice.
We offer combined shipping as a courtesy to our buyers - please help us to continue offering these discounts by adhering to the instructions above.
WHEN MAKING PAYMENT
We accept Paypal (Ebay Payments), Visa, Mastercard, Discover, and American Express. You must include your shipping address with your payment. If you have special instructions, please contact us before making payment.
Please do not use Paypal's "Notes" section on the payment to make special handling requests.
We do reserve the right to restrict  payment types or to require verification of identity to help prevent fraud.
Payment must be received within 4 days. After 4 days have passed items will be released to other buyers.
DOMESTIC SHIPPING
Most packages will arrive within 3-14 days. We ship quickly, but have no control over what the carrier does with the package once it leaves our hands.
If you need guaranteed delivery by a specific date, please E-mail us for a shipping quote that includes a guaranteed delivery date (such as Express Mail, or UPS 2 & 3 day delivery services).
Shipments to P.O. Boxes may incur additional charges (because we normally ship our heavy items vis UPS or FedEx).
*****FEDEX GROUND CANNOT DELIVER TO ALASKA, HAWAII, APO/FPO, or US POSESSIONS addresses. Please Select a Priority Mail option for delivery to those areas***
INTERNATIONAL SHIPPING
***NOTE: Due to the Pandemic, 90% of International commercial flights (which carry the mail) have been canceled, while package volume has drastically increased because everyone has to order everything they need. There just aren't enough planes to fit all the packages. Customs agencies are also working with minimal staff. This is resulting in VERY LONG delays in transit in many cases.  Delivery times of up to 80 days will be common. Please understand that this is outside of our control, and we appreciate your patience. ****
We like to keep our items available to buyers across the globe. Please familiarize yourself with the following terms for international shipping before bidding. This will help us keep our items available to international buyers.
If you cannot abide by these terms, please do not make this purchase.
Shipments to the Norway, AUSTRALIA, and Canada are currently taking a LONG time to arrive
. Please select First Class or Priority Mail to those destinations. If you selected Economy, you can expect delivery times of up to 60 days).
International First Class Mail:
This service offers an average 5-20 day delivery with in-transit tracking. If a package does not arrive within 30 days, we can arrange for a refund or replacement. We recommend this service or better if you are in a hurry to get your items.
International Economy (Standard) Shipping
averages 10-40 days for delivery.
Economy is an inexpensive, but slower delivery option.
DO NOT USE THIS OPTION IF YOU LIVE IN AUSTRALIA, NORWAY, CANADA OR OTHER AREAS OF THE WORLD PRONE TO LONG DELIVERY TIMES as you may see delivery times of up to 60 days.
This is a consolidated service where the post office gathers a bunch of packages going to the same area together to ship in a single container as a bulk shipment rather than shipping each package individually. This makes it much less expensive than regular airmail - BUT IT CAN ALSO TAKE MUCH LONGER because it is routed in the most economical way by the post office (and may be routed through several intermediate sorting centers). This service also offers limited in-transit tracking. T
he tracking number will not register until it clears customs.
By Selecting this service, you agree to allow up to 40 days for delivery.  If the package does not arrive within 40 days we can issue a refund or send a replacement. P
LEASE DO NOT CHOOSE THIS SHIPPING METHOD IF YOU CANNOT ACCEPT THE LONGER POSSIBLE TRANSIT TIME OR IF YOU CANNOT ACCEPT THE LIMITED TRACKING.
We will deliver your item to the post office quickly, but any time you are dealing with two post offices, two governments, customs clearance, and thousands of miles of distance - items can take a while to arrive.
If you need a guaranteed delivery date, please ask for a shipping quote for Express Mail.
Please understand that once we give your package to the postal service, we have no control over how the postal service routes your package or how long customs takes to clear the package for delivery.
The buyer is responsible for all customs, duties, and taxes (we cannot falsify customs forms, as it illegal to do so - Falsifying a government document carries a penalty of 5 years in prison and/or a ,000 fine per occurrence.)
These charges are normally collected by the delivering freight (shipping) company or when you pick the item up – please do not confuse them for additional shipping charges. As a seller we have no way of knowing if your government will charge you these taxes, or how much they will be. You are responsible for all taxes and duties.
Flammable items such as Paints (non-water based or flammable), Fuels, Li-Po batteries and similar items cannot be shipped internationally.
***VERY IMPORTANT*** If your address uses more than 40 characters on any line of the address or your address contains special (non-english) characters please contact us before making payment.
The shipping software we use will cut off any address line over 40 characters long. If you have a longer address than this, please contact us so we can make proper arrangements.
Some countries have restrictions on what may be imported into that country - please make sure you can legally import the item before you bid.
Some countries have size restrictions on packages. If you are ordering large items such as airplane kits, please contact us before you bid so we can make sure the item can be shipped to you as there are size restrictions to some countries.
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P.O. Box, APO/FPO, ALASKA, HAWAII, and US POSSESSIONS SHIPMENTS
Flammable items such as paints (non-water based or flammable), fuels, and similar items cannot be shipped to these addresses due to hazardous materials restrictions.
Additional shipping charges may apply to shipments going to these locations
because heavy items we ship via UPS/FEDEX ground within the continental US - a method that cannot be used to these locations.  We strongly suggest that you request Priority Mail shipping to APO/FPO addresses as first class mail to these locations can be slow.
Insurance
The listed shipping and handling charges include insurance against loss or damage for all items (foreign and domestic).
Sales Tax
Buyers in Utah pay 6.85% sales tax as required by state law.
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