+44 (0) 1424 447726 [email protected]

Question – What are Nut, Bolt & Washer Sets?Nut-bolt-1

Answer –Nut, Bolt & Washer Sets are a Nut Bolt & Washer supplied in sets and are used to connect two Vacuum Flanges together (see image)

Question – What material are Nuts, Bolts & Washers?

Answer –Nuts, Bolts & Washers are supplied in A2 stainless steel. Bolts can be supplied silver plated with un-plated Nuts & Washers.

Question – How is the vacuum tight connection made using Nut Bolt & Washer Sets?

Answer –Vacuum  CF Flanges have a special shaped knife edge for sealing with the use of a copper ring gasket and using Nut, Nut-bolt-2Bolt & Washer Sets to pull the Vacuum CF Flanges together. For Vacuum CF Flanges the connection can be made only once if the mating Flanges are disconnected, a new copper ring gasket must be used.

Vacuum ISO Bolt Hole Flanges use an insert with a o’ring for sealing and Nut, Bolt & Washer Sets to pull the Vacuum ISO Flanges together (see images)

Question – Is there a sequence for tightening the Nut, Bolt & Washer Sets?

Answer –Yes, it is important that the Nut, Bolt & Washer Sets are tightened in the correct sequence for Vacuum CF Flanges, not so important with the Vacuum ISO Flanges. The first Bolt should not be tightened completely before going to another one.flanges

To start, finger tighten all of the bolts in place and following the sequence in the images below, tighten as shown in 1/8 to 1/4 turn increments, this is to create a uniform tightening distribution on the copper ring gasket. The washers are normally located on the nut side of the flange.

Question – Is there standard sizes of Nut Bolt & Washer Sets to connect the varying types of Vacuum Flanges?

Answer –Nut, Bolt & Washer Sets are supplied in various sizes to suit the Vacuum Flanges being connected. The selection is determined by the Vacuum Flanges sizes and if it is two through hole Vacuum Flanges or one through Hole & one Tapped Vacuum Flange that is to be connected. Sets can be supplied either Metric or Imperial. (see Vacuum Services Catalogue for full list of Nut, Bolt & Washer Sets)

Please Note: Vacuum Services Ltd do not have a minimum order quantity, if your needs are for a 1 off flange, centering, gasket or clamp and we receive an order before 2,30pm we will ship to you the same day.

Click here to view our catalogue that shows the complete range of sizes available

If you cannot see what you are looking for in the catalogue please feel free to email or call us to discuss your requirements.

Tel: 01424 447726
Email:[email protected]