71605 H.B. Smith 2" Cast Iron Split Lock Nut
Replacement cast iron split lock nut designed for H.B. Smith Mills 650 series boilers.
This heavy-duty 2" split nut secures boiler sections, maintaining proper alignment and sealing integrity during assembly and operation.
✅ Key Features
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✅ Precision-machined 2" cast iron construction for long service life
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✅ Designed specifically for H.B. Smith Mills 650 boilers
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✅ Split design allows easy installation and removal without full disassembly
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✅ Ensures tight, reliable connection between boiler sections
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✅ Durable against high heat and pressure environments
📊 Specifications
| Parameter | Detail |
|---|
| Part Number |
71605 |
| Manufacturer |
H.B. Smith |
| Material |
Cast Iron |
| Type |
Split Lock Nut |
| Size |
2 Inch |
| Compatible Boilers |
Mills 650 Series |
| Application |
Boiler Section Connection / Assembly |
🔁 Cross Reference Table
| Manufacturer | Part Number | Notes |
|---|
| H.B. Smith |
71605 |
OEM replacement |
| Mills |
650 Series |
Boiler compatibility reference |
⚠️ Common Symptoms of a Worn or Damaged Lock Nut
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Boiler section leaks or misalignment
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Vibration or rattling around section joints
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Difficulty maintaining boiler pressure
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Visible cracks or corrosion on lock nut
❓ Frequently Asked Questions (FAQ)
Q: How do I know if I need to replace the lock nut?
A: Replace it if the existing nut shows cracks, corrosion, or can no longer tighten securely around the section joint.
Q: Can this nut be used on other H.B. Smith boiler models?
A: It is designed for the Mills 650 series; verify measurements before using on other models.
Q: Is this part OEM or aftermarket?
A: This is an OEM replacement part for authentic fit and performance.
🛒 Shopping Tips
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Always confirm thread size and section diameter before ordering.
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Inspect the companion hardware (gaskets, bolts, rings) when replacing lock nuts.
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Consider ordering in pairs if both sides of the boiler section are being serviced.
