What Is a Ball Screw and How Does It Work?

A ball screw is a mechanical linear actuator that converts rotary motion into linear motion using ball bearings to minimize friction and increase efficiency and accuracy.

What Types of Ball Screws Do You Offer?

We offer a variety of ball screws including ground ball screws, rolled ball screws, miniature ball screws, and high-lead ball screws to meet different precision and load requirements.

How Do I Choose the Right Ball Screw for My Application?

Selection depends on factors like load capacity, lead accuracy, speed, stroke length, and whether the application demands high positioning precision or heavy-duty performance.

What Is the Difference Between Ground and Rolled Ball Screws?

Ground ball screws offer higher precision and smoother motion, ideal for high-accuracy applications. Rolled ball screws are more cost-effective and suitable for general-purpose use.

What Maintenance Is Required for a Ball Screw?

Regular lubrication is essential. Also, keep the screw clean from debris and inspect for wear, preload loss, or unusual noise to ensure optimal performance and service life.

Bearing Dimensions: Essential Specs, Standards, and Sizing Charts for Industrial Applications

Get precise bearing dimension data straight from our factory engineers. ISO-compliant sizes for ball bearings, roller bearings, and custom OEM options. Download charts or request exact quotes today.

Request Dimension Catalog

Page Contents

Demystifying Bearing Dimensions: What Every Procurement Manager Needs to Know

Specifying the right bearing dimension isn't just about matching a part number. It's about load capacity, speed ratings, and how that fits into your assembly line or machinery setup. We've seen projects stall because someone grabbed a catalog dimension without considering shaft tolerances or housing fits.

At YIDI Motion, we've supplied bearings to over 50 countries since 2020. Our team handles everything from standard deep groove ball bearings in the 6204 series to custom angular contact units for high-speed spindles. Let's break it down practically.

Bearing dimensions follow international standards like ISO 15 and ABMA. The basics? Inner diameter (d, or bore), outer diameter (D), and width (B or T). For a 6203 bearing, that's 17mm bore, 40mm OD, 12mm width. Simple on paper. But in the field, you factor in clearance classes—C3 for hotter running motors, say—or preload for precision tools.

Procurement folks often ask: metric or inch? Most global suppliers like us stick to metric for consistency. Inch sizes linger in older US equipment, but conversions are straightforward. We keep both in stock.

Why does this matter operationally? Undersized bearings fail early under load. Oversized ones waste space and increase friction losses. Take a conveyor system: wrong dimension means misalignment, downtime, and callbacks. We've shipped thousands of sets to US importers who needed quick fixes for exactly that.

Our factory in Shijiazhuang runs German and Japanese CNC grinders. Tolerates down to P6 precision. Export manager here—I've packed 20-foot containers with mixed SKUs for Canada and Germany. Lead times? 15-30 days FOB Tianjin, depending on customs.

Search "bearing dimension" and you'll drown in PDFs. We cut through it. This guide pulls from our production data: real charts, fit recommendations, common pitfalls. No fluff.

Consider a typical inquiry: "Need 6305 dimensions for pump rebuild." We send not just specs, but tolerance tables, load ratings (static C0, dynamic Cr), and even lubrication notes. Saves engineers hours.

Bearings aren't commodities. Dimensional accuracy ties to material—chrome steel GCr15 standard, or stainless 440C for corrosives. Heat treatment affects inner race stability. We've had buyers switch after vibration tests showed our tolerances hold better.

Logistics tip: dimensions impact packaging. A pallet of 7001 thin-section bearings fits tighter than fat roller types. We optimize for 40HQ containers—up to 25 tons without damage.

In procurement workflows, start with application. Axial loads? Go thrust bearings. Combined? Angular contact. Dimension charts help narrow it, but pair with calculation tools. We offer free engineering consults via adam@yidimotion.com.

Industry shift: more OEMs demand hybrid ceramic bearings. Dimensions same as steel, but weights drop 40%. Pricey, but ROI in high-RPM apps. We've prototyped dozens.

This intro alone clocks practical advice. But dimensions evolve with tech—miniature for drones, mega for wind turbines. Stay tuned for specs. (Word count here: ~850)

Deep Dive: Standard Bearing Dimensions and Sizing Standards

ISO 492 governs tolerances. Boundary dimensions per ISO 15. Light series (6000), medium (6200), heavy (6300). Here's a starter table for deep groove ball bearings—pulled from our catalog.

Bearing No.	d (mm)	D (mm)	B (mm)	Cr (N)	C0 (N)
6000	10	26	8	4550	1700
6203	17	40	12	9310	4410
6305	25	62	17	22500	11200
6206	30	62	16	19500	9300
6308	40	90	23	40800	24000

Need full series? Download our PDF. Roller bearings widen out—cylindrical like NU 207: 35x72x17. Tapered rollers for axles, dimensions per ISO 355.

Tolerances: Normal class zero (IT5/IT6 for bore). P5 for spindles. Mismatch shaft/housing? Fretting wear kicks in fast.

Custom? We OD bearings to ±2 microns. Seen it in semiconductor wafer stages.

Warning: Mixing brands risks dimension drift. Stick to one supplier for runs.

Precision grinding of bearing races at YIDI factory

Fit Type	Shaft Tolerance	Housing Tolerance	Application Note
Loose	h6	H7	High speeds, low load
Medium	k6	J7	General purpose
Tight	m6	K7	Heavy radial loads

standard bearing dimension 6304 bearing dimension 6308 bearing dimension

Clearance matters. C2 tight, CN normal, C5 loose for expansion.

Where Bearing Dimensions Drive Performance

Electric motors: 6204 common, handles 12k RPM. Pumps: 6306 with grease seals.

8Mm Bearing

Automotive: Wheel hubs demand ABEC-3 dims. Conveyor idlers: 20mm bore rollers.

Aerospace proxies: Thin-section 6900 series, low mass. Wind turbines: 200mm+ monsters.

We've fitted bearings into CNC routers for US fabricators. Dimension match cut vibration 20%. Real feedback.

Buyer's Guide: Selecting and Procuring the Right Bearing Dimensions

Map loads first—radial, axial, moment.
Check speed factor: n*dm limit.
Environment: IP67 seals for washdowns.
Verify dims with calipers on samples.
OEM audit: Ask for CMM reports.

Risks? Fake dims from low-end suppliers. Test grease life. We pack with lithium complex.

Shipping: DHL samples 3 days, sea 25 days. MOQ 100pcs often.

Talk to Our Engineer

YIDI Motion: Factory Capabilities and Certifications

100 staff, 30% seniors. Imported Okuma lathes, Zeiss inspectors. ISO 9001, RoHS compliant.

Exports to USA, Germany. OEM for linear modules too. Address: 16-1-1601 Aobeigongyuan, Chang'an District, Shijiazhuang, Hebei, China.

Phone: +86 18134111662 | Email: adam@yidimotion.com

Feedback from Procurement Teams

Mark T., Operations Manager, Texas Machinery Inc.
Dimensions spot-on for our 6205 replacements. Faster install than SKF. Shipped quick to Houston port.