Nibco NR 51 Flange Gaskets for...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$45.86
Nibco NR 51 Flange Gaskets for Class 150 Flanges

Nibco NR 51 Flange Gaskets for Class 150 Flanges

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Model: C169240

In Stock (leaves warehouse same day if ordered before 3pm ET)

$45.86
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The flange gasket is 1/8-inch thick, full face polychloroprene (CR), 70 durometer. Please refer to Chemtrol technical data sheets, chemical resistance guides and catalogs for engineering and installation information. Chemtrol® premium line of plastic fittings is backed by a 1-year limited warranty. Because Chemtrol® is a NIBCO brand the flow-control fittings are unsurpassed in quality, performance and longevity.


Manufacturer Resources

Product Specs

All Application(s):
Lead-Free
All Basic Material:
Polychloroprene
Classification:
Chemtrol� Flange Gaskets
Pipe Schedule:
80
Product Group:
Accessory / Part
System Use:
Commercial Plumbing, Industrial, Irrigation, Lead Free*, Pharmaceutical
Product Subgroup:
Flange Gaskets
Product Type:
Chemtrol Flange Gaskets
Department:
Plumbing
Country Of Origin:
United States
Product Height:
0.13 in

Nibco C169240 – Frequently Asked Questions

1) Will the Nibco NR 51 gasket fit a Class 150 bolt pattern flange?
Yes. The NR 51 is a full face gasket cut for Class 150 flanges, offered in 3 inch and 4 inch pipe sizes (MPN C169240 for 3 inch, C169260 for 4 inch). Full face means it covers the entire flange face and the bolt holes are cut through, so the bolts pass through the gasket rather than sitting inside a ring. Match the gasket size to the nominal pipe size of the flange, not the flange OD.
2) What material is the Nibco NR 51 flange gasket and how soft is it?
Polychloroprene (CR, the same family as neoprene) at 70 durometer, 1/8 inch thick. Seventy durometer is a medium-firm rubber: soft enough to conform and seal on a plastic flange face at moderate bolt torque, firm enough that it will not extrude out from between the flanges. Check the Chemtrol chemical resistance data for your specific media before committing to CR.
3) Can I use these gaskets on a potable water line?
The NR 51 is listed lead-free and its stated system uses include commercial plumbing, industrial, irrigation, lead free and pharmaceutical service. That covers potable-side commercial plumbing work. Confirm the media and temperature against the Chemtrol chemical resistance guide, since polychloroprene is not compatible with every fluid.
4) Are these gaskets meant for Schedule 80 PVC and CPVC flanges?
Yes, the NR 51 is catalogued against Schedule 80 piping, which is the schedule Chemtrol plastic flanged systems are built in. It is a soft 70 durometer full face gasket, which is what a plastic flange needs. A hard ring gasket on a plastic flange face concentrates load on a narrow band and can crack the hub.
5) Do I need a gasket between two plastic flanges, or just bolt them face to face?
Use a gasket. Plastic flange faces are not a metal-to-metal seal, and the NR 51 provides the 1/8 inch compressible layer that takes up face irregularity as the bolts are drawn up evenly in a star pattern. Bolting plastic flanges dry risks leaks and overtorquing to chase them.
6) Does the NR 51 come with bolts, nuts and washers?
No. The NR 51 is the gasket only, a 1/8 inch full face polychloroprene disc. Bolts, nuts and flat washers for the Class 150 pattern are ordered separately, and on plastic flanges you want washers under both the head and the nut to spread the load.
7) What sizes does the Nibco NR 51 gasket come in?
Two nominal pipe sizes, 3 inch and 4 inch. Order C169240 for 3 inch and C169260 for 4 inch. If your flanged run steps between sizes, you will need one of each rather than a single part covering both.
8) Is the NR 51 a Nibco part or a Chemtrol part?
Both. Chemtrol is the Nibco brand for plastic piping components, and the NR 51 is sold as a Chemtrol flange gasket under Nibco. So a spec calling out either name on a Class 150 plastic flange gasket points to the same part.
How fast can I get the Nibco C169240 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Nibco C169240 come with a warranty?
Absolutely. The Nibco C169240 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Nibco C169240?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Nibco C169240 from ZenSupply?
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