Auto Wheel & Tractor Bearing 256906 (38-1248) | Double Row Angular Contact Ball Bearing 28×58×42mm — Wheel Hub & Agricultural Tractor, OEM & Wholesale Supply

Product Specifications

Understanding the 256906 Part Number

The 256906 is the smallest-bore member of the GB 25-69xx series, with size code 06 — one step below 256907 (size code 07, 34mm bore) and two steps below 256908 (size code 08, 37mm bore). All three share the same 25° contact angle and double row construction, but differ in bore size, outer diameter, width, and weight.

GB 25-69xx Series: All Three Bore Sizes — Complete Series Comparison

⚠️ Key series observation: While the 256907 and 256908 share the same 37mm width, the 256906 has a wider 42mm width despite its smaller 28mm bore. This produces the highest width-to-bore ratio in the series (1.5:1), reflecting the engineering requirement for a proportionally wider construction at smaller bore sizes to maintain adequate bidirectional axial load capacity. Do not assume all three bearings share the same width — always verify the full dimensions when ordering.

Width-to-Bore Ratio Progression Across the 25-69xx Series

The width-to-bore ratio decreases as bore size increases across the 25-69xx series: from 1.5:1 (256906) → 1.09:1 (256907) → 1.0:1 (256908). This reflects the engineering principle that smaller-bore double row angular contact bearings require proportionally greater width to achieve the same level of bidirectional axial load capacity relative to their shaft size. Understanding this progression helps buyers confirm they have selected the correct bearing — if the width seems unexpectedly large relative to the bore, this is by design for the 256906.

Angular Contact Ball Bearings in the Range: Full Series

Complete Auto Wheel & Tractor Hub Bearing Range — All Types

Nexans Bearings supplies the full range of auto wheel and tractor hub bearings across three bearing types:

✅ Nexans Bearings supplies all eleven sizes across three bearing types — source your complete auto wheel and tractor hub bearing range from a single supplier. Contact us for a combined quote.

Quick selection guide by bore size: 20mm bore → 156704 (single row angular contact, motorcycle/small equipment) 28mm bore → 256906 (double row angular contact, auto/tractor hub) 34mm bore → 256907 (double row angular contact, auto/tractor hub) 37mm bore → 256908 (double row angular contact, auto/tractor hub) 38mm bore → confirm OD: 72mm → 9036338006 / 73mm → 44300SAA003 / 74mm → 9036938003 40mm bore → 9036340066 43mm bore → confirm OD: 79mm → 44300S5A008 / 82mm → 9036343008 45mm bore → 44300S47008

Cross Reference Numbers

Contact our technical team with your application details for confirmed international cross-references.

Vehicle & Equipment Compatibility

The 256906 double row angular contact ball bearing is used in wheel hub applications requiring a 28mm bore and high combined radial and bidirectional axial load capability:

Please confirm exact fitment using part number 256906 or contact our technical team with your equipment make, model, and year.

Product Overview

The 256906 is a sealed double row angular contact ball bearing manufactured to OE-equivalent specifications for automotive wheel hub and agricultural tractor hub applications. With a 28mm bore, 58mm outer diameter, and 42mm width, it is the smallest-bore and lightest member of the GB 25-69xx series — and the only bearing in the series with a 42mm width, distinct from the 37mm width shared by the 256907 and 256908.

The 42mm width significantly exceeding the 28mm bore (width-to-bore ratio 1.5:1) is the defining geometric characteristic of the 256906. This proportionally wide construction provides the double row 25° angular contact geometry with the bidirectional axial load capacity required for wheel hub service at the 28mm shaft size — where the smaller bore demands a relatively wider bearing to achieve equivalent axial load performance.

At 400g, the 256906 is the lightest of the three 25-69xx series bearings, consistent with its smaller bore and OD, while the 42mm width ensures it delivers full double row angular contact performance for its application.

This bearing delivers:

• Bidirectional axial load capacity — double row 25° angular contact handles thrust in both directions simultaneously

• High radial load capacity — two rows of balls share the full radial load from vehicle weight

• Moment load resistance — double row arrangement resists hub tilting from cornering and uneven terrain

• Single-unit hub solution — no paired bearings required; one bearing handles all load directions

• Wide 42mm construction — proportionally wider than bore, ensuring full axial load capacity at the 28mm shaft size

• Superior contamination resistance — sealed construction blocks road grit, water, and mud

• Excellent grease retention — factory pre-lubricated, sealed for life under normal operating conditions

• OE-equivalent fit — manufactured to GB specification for direct replacement of 256906

• Chrome steel durability — GCr15 / 52100 material provides high hardness and fatigue strength

Sourced from Nexans Bearings' trusted manufacturing network — including leading Chinese bearing brands QC, C&U, ZWZ, TWB, and ZWA — every unit undergoes strict dimensional and quality inspection before dispatch.

Why Source from Nexans Bearings

OEM & Private Label Service

Nexans Bearings provides a complete OEM and private-label program for automotive and agricultural machinery parts distributors:

• Custom Packaging Design — your brand, your box, your label

• Laser Marking — part numbers (256906) and logos etched directly on the bearing

• GB Spec Matching — dimensional validation against OEM specification

• Clearance & Grade Selection — specify C0/C2/C3 clearance and P0–P5 precision grade per your application

• Flexible MOQ — suitable for startups and established importers alike

• Full Documentation — inspection reports, material certificates, and packing specifications per order

• Dedicated Account Management — assigned support for OEM and high-volume clients

Frequently Asked Questions

Q: What are all the part numbers for this bearing?

This bearing is referenced as 256906 (GB standard part number) and 38-1248 (NKS reference).

Q: What are the exact dimensions of the 256906?

The dimensions are: Inner Diameter 28mm × Outer Diameter 58mm × Width 42mm. Note that the width (42mm) is significantly greater than the bore diameter (28mm) — a width-to-bore ratio of 1.5:1.

Q: Why is the 256906 width (42mm) different from the 256907 and 256908 (both 37mm)?

Within the GB 25-69xx series, the width is not constant across all bore sizes. The 256906 (28mm bore) requires a 42mm width to achieve sufficient bidirectional axial load capacity at the smaller bore size, while the 256907 (34mm bore) and 256908 (37mm bore) both use a 37mm width. This is a series design characteristic — always verify the full dimensions, not just the bore, when ordering.

Q: What is the width-to-bore ratio of the 256906, and why does it matter?

The 256906 has a width-to-bore ratio of 1.5:1 (42mm width ÷ 28mm bore) — the highest in the 25-69xx series. This ratio reflects the proportionally wider construction needed at smaller bore sizes to maintain double row angular contact performance. By comparison, the 256907 is 1.09:1 and the 256908 is 1.0:1.

Q: How do I choose between the 256906, 256907, and 256908?

Select by hub shaft bore size: 28mm shaft → 256906 / 34mm shaft → 256907 / 37mm shaft → 256908. All three are GB 25-69xx series double row angular contact ball bearings with 25° contact angle, but they have different outer diameters and widths — they are not interchangeable.

Q: What equipment uses the 256906 bearing?

The 256906 is used in automotive wheel hubs and agricultural tractor wheel hubs with a 28mm bore. Contact us with your equipment make and model to confirm exact fitment.

Q: Is the 256906 pre-lubricated?

Yes. The bearing is factory pre-lubricated with grease and sealed on both sides. Under normal operating conditions, no relubrication is required during the bearing's service life.

Q: Do you supply all three sizes in the 25-69xx series?

Yes — Nexans Bearings supplies all three bore sizes: 256906 (28mm), 256907 (34mm), and 256908 (37mm). Contact us for a combined quote.

Q: Do you offer OEM or private label for this bearing?

Yes. We provide full OEM and private-label services including custom packaging, laser-etched branding, and GB-compliant documentation. Contact our sales team to discuss your requirements and MOQ.

Q: What is the minimum order quantity (MOQ)?

MOQ is flexible and negotiable. We welcome both trial orders and large-volume contracts. Contact us for a tailored quote.

Q: How quickly can you ship?

We maintain ready stock of auto wheel and tractor hub bearings including the 256906. Orders are typically dispatched within 3–7 business days. Expedited shipping is available upon request.

Q: Do you provide quality certifications?

Yes — dimensional inspection reports, material certificates, and packing specifications are available upon request for every order.

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