What are the dimensions of these flanges? Specifically how far apart are the bolt holes?, And how big is diameter on short side?

The bolt holes are 3 1/8” Center to Center. The diameter of the two bolt holes are approximately 1/2”. They are about 5/16” from the edge of the flange. I hope this helps you. Mike

My boiler has 1" input/output. Is there a 1" flange set?

Yes, please see the following. Grundfos 519602 1-Inch GF 15/26 Cast Iron Flange Set … ASIN: B0012QIZNU

grundfos ups 26-99fc will this set work on this pump?

3/4" GF 15/16 FLANGE SET, BRONZE, THREADED, PAIR, GRUNDFOS, Use with UP15-18SF, UP15-42SF, UP25-64SF, UP26-96BF, UP26-99BF YES

Grundfos 519601 Cast Iron Flange Set for UP Series Circulator Pumps-3/4 NPT, Black, 347

Product ID: 253973183

Details

Brand
Grundfos
Colour
Black
Item dimensions L x W x H
5.1 x 5.1 x
Material
Cast Iron
Size
347

📏3/4-inch NPT threaded pipe connection

🔩Includes 2 flanges, 2 gaskets, 4 bolts & nuts

⚙️Durable cast iron build

AR$167431

Duties & taxes included

In stock

Sold byAmazon ArgentinaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Brand
Grundfos
Colour
Black
Item dimensions L x W x H
5.1 x 5.1 x

Description

🔧 Upgrade your pump game with the ultimate flange set—durability meets precision!

THREADED NPT CONNECTION - Secure 3/4-inch pipe fitting ensures reliable, vibration-resistant sealing
TRUSTED BY PROFESSIONALS - Highly rated with 4.6 stars from 373 reviews, a go-to choice for expert pump maintenance
COMPLETE INSTALLATION KIT - Includes all essential components—flanges, gaskets, bolts, and nuts—for hassle-free setup
ENGINEERED FOR PRECISION FIT - Seamlessly pairs with Grundfos UP & UPS pumps for leak-proof performance
ROBUST CAST IRON CONSTRUCTION - Built to last with industrial-grade durability that withstands demanding environments

The Grundfos 519601 Cast Iron Flange Set is a premium accessory designed for UP Series Circulator Pumps, featuring a durable cast iron construction, secure 3/4-inch NPT threaded connections, and a complete kit including flanges, gaskets, bolts, and nuts. Trusted by professionals for its perfect fit and leak-proof reliability, it ensures seamless pump integration and long-lasting performance.

Specifications

Asin	B0012QGVRC
Date First Available	24 January 2013
Is Discontinued By Manufacturer	No
Item Model Number	519601
Manufacturer	Grundfos
Product Dimensions	5.08 x 5.08 x 5.08 cm; 0.28 g

Reviews

User

Todo perfecto.

Todo bien con el producto, queremos compras mas artículos como este, en total de 102 artículos. Me pueden dar un mejor precio? Gracias

21.08.2023

User

Perfect for their use case!

They do their job perfectly! The quality of the product is top of the line. I'm using it to pair it with my Grundfos water pump and it fit perfectly and hasn't leaked at all. You can tell this product is going to last.

21.06.2017

User

Worked great.

Exactly what I needed.

22.10.2026

User

nice one it works

very good product, totally happy for it

8.01.2019

User

good product

its good one essy to install

23.05.2023

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AR$167431

Duties & taxes included

In stock

Sold byAmazon ArgentinaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Argentina.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews