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

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

Product ID: 5784606

Details

Brand
Grundfos
Color
Black
Item dimensions L x W x H
2 x 2 x 2
Material
Cast Iron
Size
347

📏3/4-inch NPT threaded pipe connection

🔩Includes bolts & nuts for secure fit

⚙️Durable cast iron build

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€ 67.33

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Sold byAmazon SlovakiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Upgrade your pump game with Grundfos precision and power!

COMPLETE INSTALLATION KIT - Includes 2 flanges, 2 gaskets, 4 bolts & nuts for hassle-free setup
COMPACT EFFICIENT DESIGN - Streamlined 2x2 inch size fits tight spaces without compromise
ROBUST CAST IRON CONSTRUCTION - Built to last with industrial-grade durability
PRECISION 3 4 NPT THREADED CONNECTION - Ensures leak-proof, secure pipe fitting every time
ENGINEERED FOR VERSA FLO UP UPS PUMPS - Seamless compatibility with top circulator pumps

The Grundfos 519601 Cast Iron Flange Set is a premium accessory designed specifically for Versa Flo UP and UPS series circulator pumps. Featuring durable cast iron construction, a secure 3/4-inch NPT threaded connection, and a complete kit with flanges, gaskets, bolts, and nuts, it guarantees a reliable, leak-resistant installation. Perfect for professionals seeking long-lasting plumbing solutions with trusted brand quality.

Specifications

ASIN	B0012QGVRC
Best Sellers Rank	#325,358 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #485 in Water Pump Accessories
Brand	Grundfos
Color	Black
Compatible Groove Diameter	15 Millimeters
Customer Reviews	4.7 4.7 out of 5 stars (380)
Fastener Type	bolts
Finish Types	Plain
Global Trade Identification Number	00632514009769
Included Components	Grundfos 519601 Cast Iron Flange Set for UP Series Circulator Pumps - 3/4" NPT
Item Diameter	0.75 Inches
Item Dimensions	2 x 2 x 2 inches
Item Shape	Round
Item Type Name	Grundfos 519601 Cast Iron Flange Set for UP Series Circulator Pumps - 3/4" NPT
Item Weight	0.01 Ounces
Manufacturer	Grundfos
Material Type	Cast Iron
Model	519601
Number Of Items	1
Number of Pieces	6
Outside Diameter	0.75 Inches
Part Number	519601
Screw Head Style	Hex
Set Name	Grundfos UP Series Circulator Pumps Flange Set
Size Name	347
Thread Size	3/4-18
UPC	783961374501 632514009769
Unit Count	1.0 Count

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