Yamada 611181 Bolt for NDP-80
The Yamada 611181 is the genuine bolt for NDP-80 Series pumps. It looks like ordinary hardware and is not: the grade, the length and the thread are chosen for a joint that is clamping an elastomer bead and being shaken several hundred times a minute.
Substituting hardware store hardware is a false economy here. Wrong grade bolts stretch, wrong length bolts bottom out before they clamp, and plated fasteners in a marine environment seize into the casting so the next rebuild starts with drilling. Keeping a few spares with the seal kit avoids all of it.
Key Features
- Genuine Yamada replacement bolt
- Fits NDP-80 Series pumps
- 4 per pump in the assembly that uses it
- Correct grade, length and thread for the joint
- Keeps clamping load even around elastomer sealed faces
- Direct replacement for corroded, stretched or missing hardware
Applications
- NDP-80 Series pumps
- Pump rebuilds and scheduled overhauls
- Replacing corroded or seized hardware
- Making up a complete set after a strip down
- Marine installations where corrosion takes fasteners first
- Industrial and transfer pump service
Specifications
- Brand: Yamada
- Manufacturer: Yamada America
- Manufacturer Part Number: 611181
- Part Type: Bolt
- Fits: NDP-80 Series pumps
- Quantity Used: 4 per pump
- Series Port Size: 3 in on the NDP-80 Series
- Condition: New
Frequently Asked Questions
Q: Can I use a standard bolt from a hardware store?
It is not advisable. Grade, length and thread are chosen for the joint, and a substitute that stretches or bottoms out changes the clamping load on a face that is sealed by an elastomer bead.
Q: Why did the original corrode so badly?
Salt air and washdown get into the threads and stay there. On marine installations the fasteners are usually the first part of the pump to need attention, well before anything internal.
Q: What torque should I use?
The factory figure for that joint, applied in sequence across the joint rather than around it. Even clamping is what keeps the sealed faces sealed.
Q: Do I need to replace all of them at once?
If several are corroded, replace the set. A mix of new and tired fasteners gives uneven clamping, and the old ones will need doing at the next service anyway.
Not sure this is the right part? Send us a Picture of the Pump Plate on your pump and the CLR Marine team will confirm the correct bolt.
CLRMarine
