Auto Wheel & Tractor Bearing 44300SAA003 (38-1254) | Double Row Ball Bearing 38×73×40mm — Wheel Hub & Agricultural Tractor, OEM & Wholesale Supply

Product Specifications

Understanding the 44300SAA003 Part Number

The 44300S series covers a wide range of double row sealed ball bearings for agricultural machinery and vehicle wheel hub applications. The AA003 suffix identifies this specific 38mm bore, 73mm OD configuration — distinguishing it from the 5A008 suffix (43mm bore, 79mm OD) and 47008 suffix (45mm bore, 84mm OD) within the same 44300S family. This is also the only 44300S series bearing with a 38mm bore in the Nexans Bearings range.

Single Width vs Dual Width — Why 44300SAA003 Has One Width Value

Unlike the other bearings in this series which feature dual width specifications (e.g., 33/36mm, 38/41mm, 40/42mm), the 44300SAA003 has a single width of 40mm:

The single 40mm width of the 44300SAA003 indicates that the inner ring width and overall assembly width are specified as a unified dimension in this GB 44300S series configuration — reflecting a distinct structural design compared to the 90363/90369 series variants. Always order by the exact part number 44300SAA003 and specify 38×73×40mm.

⚠️ Critical Distinction: Three 38mm Bore Variants — 72mm, 73mm, and 74mm OD

The most important sourcing challenge in this product range: Nexans Bearings supplies three different double row sealed ball bearings with the same 38mm bore but different outer diameters. These are not interchangeable:

⚠️ CRITICAL WARNING: All three bearings share the same 38mm bore but have outer diameters of 72mm, 73mm, and 74mm — differing by just 1mm between each. Installing the wrong OD bearing will result in either a loose fit (undersized OD) or inability to install (oversized OD) in the hub housing. Always identify your hub housing bore precisely and source by exact part number. Contact our technical team if you are unsure which variant your equipment requires.

Complete Tractor & Auto Wheel Hub Double Row Bearing Range

Nexans Bearings supplies the full size range of double row sealed ball bearings for tractor and auto wheel hub applications:

✅ Nexans Bearings supplies all five sizes — source your complete tractor/auto wheel hub bearing range from a single supplier. Contact us for a combined quote across all part numbers.

Selection guide — Step 1: Match the inner diameter (bore) to your hub shaft: 38mm shaft → proceed to Step 2 / 43mm shaft → 44300S5A008 / 45mm shaft → 44300S47008Selection guide — Step 2 (38mm bore only): Confirm your hub housing bore (OD): 72mm → 9036338006 / 73mm → 44300SAA003 / 74mm → 9036938003

Cross Reference Numbers

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

Vehicle & Equipment Compatibility

The 44300SAA003 double row ball bearing is used across a range of automotive and agricultural equipment wheel hub applications requiring a 38mm bore and 73mm housing bore:

Please confirm exact fitment using part number 44300SAA003 or contact our technical team with your equipment make, model, and year. For 38mm shaft equipment, always confirm the hub housing bore (72mm, 73mm, or 74mm) to select the correct bearing.

Why Double Row Ball Bearings for Tractor & Auto Wheel Hubs

Product Overview

The 44300SAA003 is a sealed double row deep groove ball bearing manufactured to OE-equivalent specifications for automotive wheel hub and agricultural tractor hub applications. With a 38mm bore, 73mm outer diameter, and 40mm width, it is the only 44300S series bearing with a 38mm bore in the Nexans Bearings range — and the middle variant of three 38mm bore options available at 72mm, 73mm, and 74mm outer diameters.

The single 40mm width (versus the dual 33/36mm width of the 90363 and 90369 series variants) reflects the distinct structural design of the 44300S series at this bore size — providing a unified width dimension for simplified hub assembly specification.

At 580g, the 44300SAA003 offers robust construction for demanding tractor and vehicle hub applications, with the full double row sealed ball bearing performance expected across the range.

This bearing delivers:

• Correct hub housing fit — 73mm OD precisely matches the hub housing bore for equipment specifying the 44300SAA003

• High radial and axial load capacity — double row ball arrangement handles combined loads of loaded tractor and vehicle wheel hubs

• Moment load resistance — double row geometry resists tilting forces from uneven terrain and field operation

• Superior contamination resistance — sealed construction blocks dust, mud, and moisture in agricultural and road environments

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

• Simplified single-width specification — 40mm unified width for straightforward hub assembly

• OE-equivalent fit — manufactured to GB/OE specification for direct replacement of 44300SAA003

• Chrome steel durability — GCr15 / 52100 material provides high hardness, wear resistance, 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 agricultural machinery and automotive parts distributors:

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

• Laser Marking — part numbers (44300SAA003) and logos etched directly on the bearing

• GB / OE 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 44300SAA003 (full part number / GB standard) and 38-1254 (NKS reference). The 44300S is the bearing series; AA003 is the specific configuration suffix for this 38mm bore, 73mm OD variant.

Q: What are the exact dimensions of the 44300SAA003?

The dimensions are: Inner Diameter 38mm × Outer Diameter 73mm × Width 40mm.

Q: Why does the 44300SAA003 have only one width value (40mm) while other bearings in the range have two (e.g., 33/36mm)?

The single 40mm width reflects the distinct structural design of the 44300S series at this bore size — the inner ring width and overall assembly width are specified as a unified 40mm dimension. The dual-width bearings (90363 and 90369 series) have a different construction where the inner ring is narrower (33mm) than the overall assembly (36mm).

Q: What is the difference between 44300SAA003, 9036338006, and 9036938003?

All three have a 38mm bore but different outer diameters: 44300SAA003 = 73mm OD / 9036338006 = 72mm OD / 9036938003 = 74mm OD. They also belong to different GB series (44300S / 90363 / 90369) and have different widths (40mm / 33/36mm / 33/36mm). They are not interchangeable — always match to your hub housing bore.

Q: How do I choose the correct 38mm bore bearing?

Measure your hub housing bore (outer diameter of the bearing seat): 72mm → 9036338006 / 73mm → 44300SAA003 / 74mm → 9036938003. Contact our technical team with your equipment details if you are unsure.

Q: What equipment uses the 44300SAA003 bearing?

This bearing is used in small-to-medium agricultural tractor wheel hubs and light vehicle wheel hub assemblies with a 38mm bore and 73mm hub housing bore. Contact us with your equipment make and model to confirm exact fitment.

Q: Is the 44300SAA003 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 the complete range of tractor wheel hub bearings?

Yes. Nexans Bearings supplies all five variants: 9036338006 (38×72mm), 44300SAA003 (38×73mm), 9036938003 (38×74mm), 44300S5A008 (43×79mm), and 44300S47008 (45×84mm). Contact us for a combined quote across the full range.

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 agricultural and automotive wheel hub bearings including the 44300SAA003. 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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