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Stemco 300-4009 Oil Hub Cap 6-Bolt 5.5" Circle for Dexter 22.5K–27.5K Axles | Replaces 021-038-02
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✅ STEMCO 300-4009 Oil Hub Cap – 6-Bolt, 5.5" Bolt Circle w/ Gasket & Plug
Fits: Dexter 22,500–27,500 lb. heavy-duty air brake axles
Includes: Pre-installed red plug (359-5990) and gasket (330-3009)
Stemco Part Number: 300-4009
Dexter Cross-Ref: 021-038-02
Non Bulk Equivalent: 340-4009
This is a genuine STEMCO aluminum hub cap engineered for long-lasting durability and trusted performance. Built with a 6-bolt pattern and cast aluminum housing, it’s made to withstand high temperatures and resist warping in severe-duty air brake applications.
🔧 Key Features:
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Fits Dexter 22.5K–27.5K air brake axles
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6-bolt mounting, 5.5" bolt circle (5/16" bolts)
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Made from cast aluminum for superior strength and heat dissipation
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Overall depth: 2-11/16" | Inside depth: 1-15/16"
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Flange ID/OD: 4-3/8" inner, 6-1/4" outer
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Suitable for oil, semi-fluid grease, or hard-pack grease
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Red plug design allows controlled venting
🔩 Common Applications:
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Dexter heavy-duty trailer axles with air brakes
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22,500 lb. and 27,500 lb. hub systems
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Suitable for fleets using oil bath or semi-fluid lubrication
📦 What’s Included:
🔁 Replacement & Related Parts:
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Bulk version of Stemco 340-4009 (no retail packaging)
🛠️ Engineered to Last:
STEMCO has been the industry standard in hub caps for over 60 years. This cap uses cast aluminum to reduce heat and resist warping—essential for high-load, high-heat environments. The trademark red plug allows venting and pressure equalization, extending hub life and reducing service needs.
Designed for heavy-duty commercial fleets looking for premium, long-life performance.