Auto Wheel & Tractor Bearing 256808 (38-1246) | Double Row Angular Contact Ball Bearing 40×74×40mm — Wheel Hub & Agricultural Tractor, OEM & Wholesale Supply

Product Specifications

Understanding the 256808 Part Number

The 256808 belongs to the GB 25-68xx series — a separate series from the GB 25-69xx series (256905–256908) also in the range. Both series share the same 25° contact angle and double row construction, but the 68xx and 69xx designations indicate different bearing geometry and dimensional standards. The 256808 is the only 25-68xx series bearing in the Nexans Bearings auto wheel and tractor hub range.

⚠️ Critical Distinction: Same Bore & OD, Different Type — 256808 vs 9036340066

The 256808 and 9036340066 share the same 40mm bore and 74mm outer diameter but are fundamentally different bearings:

⚠️ CRITICAL WARNING: Both bearings fit the same 40mm shaft and 74mm housing, but are not interchangeable. The 256808 (angular contact, 40mm wide) provides superior bidirectional axial and moment load capacity through its 25° contact angle — essential for applications with significant combined loading. The 9036340066 (deep groove ball, 42mm wide) is optimised for primarily radial loads. Selecting the wrong bearing type will result in premature failure in applications with high axial or moment loads. Always confirm your application's load profile and consult our technical team if unsure.

Three Bearings with 74mm OD — Selection Guide

Three bearings in the Nexans Bearings range share a 74mm outer diameter:

⚠️ 74mm OD selection guide: 38mm bore + 74mm housing → 9036938003 (deep groove ball) 40mm bore + 74mm housing + radial-dominant load → 9036340066 (deep groove ball, 42mm wide) 40mm bore + 74mm housing + combined/axial load → 256808 (angular contact, 40mm wide)For the 40mm bore + 74mm housing combination, the choice between 256808 and 9036340066 depends on the application load profile — not just the shaft and housing dimensions. Contact our technical team to confirm the correct bearing for your specific application.

GB 25-68xx vs GB 25-69xx: Two Double Row Angular Contact Series

Both series share the same 25° contact angle and double row construction, but follow different GB dimensional standards. The 25-68xx series (256808) covers larger bore sizes, while the 25-69xx series (256905–256908) covers smaller bore sizes in the Nexans Bearings range.

Complete Double Row Angular Contact Ball Bearing Range

The 256808 is the largest-bore double row angular contact ball bearing in the range (40mm bore), belonging to the separate 25-68xx series. Together with the five 25-69xx series bearings (256905–256908) and the single row 15° angular contact bearing (156704), Nexans Bearings offers the most comprehensive angular contact wheel hub bearing range available from a single Chinese supplier.

Angular Contact Ball Bearings in the Range: Full Series

Complete Auto Wheel & Tractor Hub Bearing Range — All Types

✅ Nexans Bearings supplies all thirteen 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) 25mm bore → 256905 (double row angular contact) 28mm bore → 256906 (double row angular contact) 34mm bore → 256907 (double row angular contact) 37mm bore → 256908 (double row angular contact) 38mm bore → confirm OD: 72mm → 9036338006 / 73mm → 44300SAA003 / 74mm → 9036938003 40mm bore → confirm type & width: angular contact 40mm wide → 256808 / deep groove ball 42mm wide → 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 256808 double row angular contact ball bearing is used in wheel hub applications requiring a 40mm bore with combined radial and bidirectional axial load capability:

⚠️ For 40mm bore + 74mm housing applications, confirm whether your application requires angular contact (combined load) or deep groove ball (radial-dominant load) before ordering. Contact our technical team with your equipment details.

Product Overview

The 256808 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 40mm bore, 74mm outer diameter, and 40mm width, it is the largest-bore double row angular contact ball bearing in the Nexans Bearings range — and the sole representative of the GB 25-68xx series.

Its most critical sourcing context: the 256808 shares the exact same 40mm bore and 74mm OD as the 9036340066 (double row deep groove ball bearing, 40×74×42mm) — but differs in bearing type (angular contact vs deep groove ball) and width (40mm vs 42mm). For the 40mm bore + 74mm housing combination, the correct bearing depends entirely on the application load profile: angular contact for combined radial and axial loads (256808), deep groove ball for primarily radial loads (9036340066).

The width equal to bore (both 40mm) — a 1:1 width-to-bore ratio shared with the 256908 — reflects the double row angular contact geometry at this bore size, providing full bidirectional axial load capacity in a single sealed unit.

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 256808

• 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

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

• Laser Marking — part numbers (256808) 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 256808 (GB standard part number) and 38-1246 (NKS reference).

Q: What are the exact dimensions of the 256808?

The dimensions are: Inner Diameter 40mm × Outer Diameter 74mm × Width 40mm. Note that the width equals the bore diameter — both are 40mm (1:1 width-to-bore ratio).

Q: What is the difference between the 256808 and the 9036340066? Both are 40×74mm.

Both fit a 40mm shaft and 74mm housing, but are fundamentally different: 256808 = double row angular contact ball bearing (25°), 40mm wide / 9036340066 = double row deep groove ball bearing, 42mm wide. The 256808 provides superior bidirectional axial and moment load capacity; the 9036340066 is optimised for radial-dominant loads. They are not interchangeable — selection depends on your application's load profile.

Q: How do I choose between the 256808 and 9036340066 for my 40mm bore + 74mm housing application?

Confirm your application's load profile: if the hub experiences significant axial loads or moment loads (e.g., from cornering, braking, or uneven terrain) → 256808 (angular contact). If the load is primarily radial (vehicle weight, road forces) → 9036340066 (deep groove ball). Contact our technical team with your equipment details for a confirmed recommendation.

Q: What is the difference between the GB 25-68xx and 25-69xx series?

Both are double row angular contact ball bearing series with a 25° contact angle, but follow different GB dimensional standards. In the Nexans Bearings range, the 25-68xx series (256808) covers the 40mm bore, while the 25-69xx series (256905–256908) covers 25–37mm bores.

Q: Is the 256808 the largest angular contact bearing in the range?

Yes — the 256808 (40mm bore) is the largest-bore double row angular contact ball bearing in the Nexans Bearings auto wheel and tractor hub range.

Q: What equipment uses the 256808 bearing?

The 256808 is used in automotive wheel hubs and medium agricultural tractor wheel hubs with a 40mm bore and 74mm housing, where combined radial and axial loads are present. Contact us with your equipment make and model to confirm exact fitment.

Q: Is the 256808 pre-lubricated?

Yes. The bearing is factory pre-lubricated with grease and sealed on both sides. No relubrication is required under normal operating conditions.

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

Yes — 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. Contact us for a tailored quote.

Q: How quickly can you ship?

Ready stock maintained. Orders typically dispatched within 3–7 business days. Expedited shipping available on request.

Q: Do you provide quality certifications?

Yes — dimensional inspection reports, material certificates, and packing specifications available on request.

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