6300 Series Bearing Size Chart: 6300 to 6311 Dimensions

The 6300 medium series deep groove ball bearing range covers bore sizes from 10 mm (6300) to 55 mm (6311), with outside diameters spanning 35 mm to 120 mm. Built with a heavier cross-section than light-series bearings, medium series units handle substantially higher radial loads across industrial gearboxes, electric motors, and heavy manufacturing equipment in Pakistan^[1]. Finding the correct replacement requires matching the exact boundary dimensions - bore, outer diameter, and width - alongside the specific enclosure suffix.

Every 6300 series bearing part number specifies a unique combination of bore, outer diameter, and width, requiring exact variant verification before ordering. Ordering strictly by numerical size without matching closure suffixes (such as open, ZZ metal shields, or 2RS rubber seals) leads to premature equipment failure or fitting issues.

HI-TEC supplies verified 6300 series bearings across Pakistan, providing real-time pricing and stock availability directly via WhatsApp at +92-348-5563390. Below is the complete dimensional size chart for part numbers 6300 through 6311, detailing exact measurements, closure suffixes, and product tiers available in stock.

What are the exact dimensions for 6300 to 6311 series bearings?

The 6300 medium series deep groove ball bearing range covers bore sizes from 10 mm (6300) to 55 mm (6311), with outside diameters from 35 mm to 120 mm. Every 6300 series bearing part number specifies a unique combination of bore, outer diameter, and width, requiring exact variant verification before ordering. Sizes range from 6300 (10x35x11 mm) up to 6311 (55x120x29 mm) across HI-TEC and HI-TEC SILVER brand tiers.

Review detailed specifications in the 6300 series deep groove ball bearing category page before issuing purchase orders.

Parts in this article

Are all bearings with the same 6300 series size dimensions interchangeable?

Identical dimensions in the 6300 series do not make bearings interchangeable, as variants like open, shielded (ZZ), and rubber sealed (2RS) serve distinct operational requirements. Selecting between ZZ metal shields and 2RS rubber seals depends on exposure to dust, moisture, and operating speed requirements^[1]. Ordering strictly by size without specifying the exact variant suffix risks equipment failure or improper sealing.

To ensure severe environmental compatibility, match your operating conditions to the correct closure design criteria:

Using an open bearing where grease containment is mandatory leads to rapid lubricant loss. Conversely, installing a 2RS rubber sealed bearing in extreme high-speed applications causes heat buildup due to lip friction^[1]. Check our technical guide to deep groove ball bearings to select appropriate sealing options for your machinery.

How do I calculate bore size and order 6300 series bearings in Pakistan?

Bore size for bearings 6304 and above is calculated by multiplying the last two digits by 5, while sizes 6300 to 6303 follow fixed millimetre designations. HI-TEC supplies verified 6300 series bearings across Pakistan, providing real-time pricing and stock availability directly via WhatsApp at +92-348-5563390. Verifying the full part number including variant suffixes ensures correct quote generation without pricing or stock errors.

Follow these four steps to calculate measurements accurately and place orders nationwide:

1. Determine the bore code: For sizes 6300 (10 mm), 6301 (12 mm), 6302 (15 mm), and 6303 (17 mm), use static standard sizing. For 6304 through 6311, multiply the final two digits by 5 (e.g., 08 x 5 = 40 mm bore for a 6308 bearing).
2. Identify the enclosure suffix: Check if your application requires open construction, non-contact metal shields (ZZ), contact rubber seals (2RS or 2RS E), or a snap ring configuration (ZNR).
3. Select the product tier: Choose between HI-TEC standard line for general cost-effective utility or HI-TEC SILVER premium line featuring extended warranty protection for heavy industrial duty cycles.
4. Request real-time WhatsApp quote: Submit your full designation (e.g., 6309 2RS or 6305 ZZ) to HI-TEC sales engineers. Standard delivery takes 3 to 5 business days nationwide, with express options reaching key locations in 1 to 2 business days.

Visit the official HI-TEC Pakistan contact page to initiate instant bulk inquiries or catalog verification.

More parts in this article

Frequently Asked Questions

What are the exact dimensions for 6300 to 6311 series bearings?

Dimensions range from a 10 mm bore, 35 mm OD, and 11 mm width for the 6300 bearing up to a 55 mm bore, 120 mm OD, and 29 mm width for the 6311 bearing. Intermediate sizes scale progressively across standard metric boundary profiles.

What is the difference between 6300 series ZZ and 2RS variants?

ZZ variants utilize non-contact metal shields designed for high-speed, clean environments requiring low friction. 2RS variants use contacting rubber seals that physically seal against dirt and moisture, making them ideal for contaminated operating conditions.

How do I determine the bore size of a 6300 series bearing?

For part numbers 6304 through 6311, multiply the last two digits of the bearing number by 5 to calculate bore size in millimetres. Sizes 6300, 6301, 6302, and 6303 represent fixed standard bores of 10 mm, 12 mm, 15 mm, and 17 mm respectively.

Are all bearings with the same 6300 series size dimensions interchangeable?

No, identical boundary dimensions do not guarantee interchangeability. Bearings differ in sealing types (open, ZZ, 2RS), internal clearance, and brand tier, requiring complete part number and suffix matching prior to installation.

References

1. [PDF] Bearing Handbook for Electric Motors - SKF. https://cdn.skfmediahub.skf.com/api/public/0901d19680056c36/pdf_preview_medium/0901d19680056c36_pdf_preview_medium.pdf (2026-03-22)