Auto Wheel & Tractor Bearing 256907 (38-1249) | Double Row Angular Contact Ball Bearing 34×64×37mm — Wheel Hub & Agricultural Tractor, OEM & Wholesale Supply

Understanding the 256907 Part Number

The 256907 is the immediate smaller sibling of the 256908 within the GB 25-69xx series of double row angular contact ball bearings. The size code increments from 07 (34mm bore, 256907) to 08 (37mm bore, 256908), following the standard GB size code progression. Both bearings share the same 25° contact angle and double row construction — differing only in bore size, outer diameter, and weight.

⚠️ Critical Distinction: Same Width (37mm), Different Bore — 256907 vs 256908

Both the 256907 and 256908 belong to the same GB 25-69xx series and share the same 37mm width, but are not interchangeable:

⚠️ CRITICAL WARNING: Both bearings have the same 37mm width and belong to the same GB series, but have different inner diameters (34mm vs 37mm) and outer diameters (64mm vs 72mm). They are not interchangeable. Always confirm your hub shaft bore: 34mm shaft → 256907 / 37mm shaft → 256908. The shared width can mislead buyers into assuming the bearings are the same — always verify the full dimensions.

Width-to-Bore Geometry: 256907 vs 256908

A notable geometric difference between the two 25-69xx series siblings:

In the 256907, the width (37mm) exceeds the bore (34mm) — a wider-than-bore construction that provides the double row angular contact geometry with even greater axial load capacity relative to the shaft size. In the 256908, width equals bore (both 37mm). Both designs reflect the robust wide construction characteristic of the GB 25-69xx series for wheel hub service.

GB 25-69xx Series: Both Bore Sizes Available

Nexans Bearings supplies both bore sizes in the GB 25-69xx double row angular contact ball bearing series. Source both from a single supplier — contact us for a combined quote.

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 ten 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) 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 256907 double row angular contact ball bearing is used in wheel hub applications requiring a 34mm bore and high combined radial and bidirectional axial load capability:

Please confirm exact fitment using part number 256907 or contact our technical team with your equipment make, model, and year.

Product Overview

The 256907 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 34mm bore, 64mm outer diameter, and 37mm width, it is the smaller-bore sibling of the 256908 (37mm bore, 72mm OD, 37mm width) within the GB 25-69xx series — sharing the same 37mm width and 25° contact angle, but serving a smaller 34mm bore hub shaft.

The 37mm width exceeding the 34mm bore (width-to-bore ratio 1.09:1) reflects the robust wide construction of the GB 25-69xx series, providing the double row angular contact geometry with high bidirectional axial load capacity relative to the shaft size — essential for the combined radial, axial, and moment loads of wheel hub service.

At 520g, the 256907 is 30g lighter than the 256908, consistent with its smaller bore and OD while maintaining the same series width.

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

• 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 256907

• 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 (256907) 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 256907 (GB standard part number) and 38-1249 (NKS reference).

Q: What are the exact dimensions of the 256907?

The dimensions are: Inner Diameter 34mm × Outer Diameter 64mm × Width 37mm. Note that the width (37mm) exceeds the bore diameter (34mm).

Q: What is the difference between the 256907 and the 256908?

Both are GB 25-69xx series double row angular contact ball bearings with a 25° contact angle and the same 37mm width, but: 256907 = 34mm bore, 64mm OD, 520g / 256908 = 37mm bore, 72mm OD, 550g. They are not interchangeable. Select by hub shaft bore: 34mm → 256907 / 37mm → 256908.

Q: Why do the 256907 and 256908 have the same width (37mm) but different bores?

Within the GB 25-69xx series, the 37mm width is a series-level design parameter that applies to both the 07 (34mm bore) and 08 (37mm bore) size codes. The width reflects the double row angular contact geometry required for wheel hub service, while the bore and OD scale with the shaft and housing dimensions.

Q: Why is the width (37mm) greater than the bore (34mm) in the 256907?

The 37mm width exceeds the 34mm bore because the double row angular contact construction at 25° requires a minimum width to accommodate two rows of balls and maintain the correct contact geometry. This wide-relative-to-bore design provides high bidirectional axial load capacity for the 34mm shaft size.

Q: What equipment uses the 256907 bearing?

The 256907 is used in automotive wheel hubs and agricultural tractor wheel hubs with a 34mm bore. Contact us with your equipment make and model to confirm exact fitment.

Q: Is the 256907 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 both the 256907 and 256908?

Yes — Nexans Bearings supplies both bore sizes in the GB 25-69xx series. 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 256907. 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.

Contact Us — Get a Quote Within 24 Hours