BeamClamp Components Type BY and BYP


The Type BY clamp is designed for High Friction and Tensile applications that exceed the capacities of the standard BeamClamp products. It features a recessed top that prevents the head of the bolt from rotating during installation therefore requires the use of only one wrench. The Type BYP washer can be used to fill in the recess of the Type BY to provide a flat surface for a washer and nut. This also allows the Type BY clamps to be used together in beam to beam connections. The full width tail of the BY allows for use with slotted holes for greater diversity in applications.

  • Hot Dip Galvanized to BS EN ISO 1461
  • Manufactured from Ductile Iron to BS EN 1563

The BY recess is suitable for the hexagonal head of Grade 8.8 and 10.9 bolts. The Type BYP may be used to fill in the recess allowing for any grade bolt or nut to be tightened down to its surface.

Product FAQs

Why is the BY Clamp capable of such high frictional loads?

Answer: The BY Clamp has much larger sections than our standard clamps which allow it to be tightened up to much higher torques. This increases the clamping force considerably onto the steel and therefore increases the frictional slip capacity. The BY can be used with grade 8.8 or 10.9 bolts and for increased frictional capacity A490 bolts and apply a higher torque.

What is the BYP used for?

Answer: The BYP is used to fill in the recess of the BY and convert it to a flat top clamp. This allows two BY’s to be used together and only one wrench to tighten the connection.

What is the Frictional failure mode?

Answer: The frictional failure mode is when the connection is measured to have moved 1mm or 0,039” from its original position. The safety factor of 2 to 1 is then applied to this load, therefore, the test load we publish is at half that of the point where the connection even moves 1mm.

Can I use packing pieces with the BY?

Answer: Yes, our BF3,BF4 and BH2 packing pieces are specificall designed for use with our BY. A calculation chart is available at our resources section under “Specifying Beamclamp”, this shows what tail lengths and packing pieces are required.

Technical Specifications

Diagram - BY Clamp
Diagram - BY Clamp
A Bolt Dia. B C in. D1 D2 E Width
Tensile SWL (kN)
per bolt
(5:1 Factor of Safety)
Frictional SWL (kN)
per two bolts
Painted Steel
(2:1 Factor of Safety)
1 2
BY G12 8.8 M12 27 28.5 13 23 5 12.5 40 90 10.60 4.29
BY G16 8.8 M16 33 33 17 30 8 15 49 240 17.29 8.02
BY G20 8.8 M20 39 39 22 37 10 18 55 470 29.58 11.94
BY G12 10.9 M12 27 28.5 13 23 5 12.5 40 130 11.65 7.88
BY G16 10.9 M16 33 33 17 30 8 15 49 300 19.41 15.50
BY G20 10.9 M20 39 39 22 37 10 18 55 647 32.00 23.76
  • Add “1” or “2” to the product code to indicate the desired tail length. For example, a M16 bolt diameter with 8mm tail would be code BY1G16.
  • *Frictional failure for the Type BY Clamp is 1mm slip from its original position.
  • Frictional capacities are based on shot blast and painted steelwork.
  • Due to variance in thickness of Hot Dip Galvanized coatings please contact us for frictional capacities based on Hot Dip Galvanized steelwork.