Hollo-Bolts

Hollo-Bolt – an expansion bolt for Structural Hollow Sections (SHS/HSS) with “blind connections,” when you only have access to one side of the connection. As the bolt head is tightened, the cone is pulled up the bolt thread, causing the legs of the sleeve to expand until the cone locks the sleeve against the inner wall of the hollow section.Available in two versions: the original 3-part design for general hollow section connections and the larger sized 5-part High Clamping Force (HCF) version, for higher strength structural connections.

Hollo-Bolt Diagram


Installation is simple just insert the fastener into a pre-drilled hole, then tighten with a torque wrench.


Head Types

Hollo-Bolt Sizes, Tensile, Shear and Dimentional Info for Hex And CounterSunks

Head TypeCodeDiam/LengthClampingRange
Otr Ply SleeveLengthCollarTorqSafe Working
Load 5: 1
(W)min t(L)Height (H)DiamAcrosFlatsft/lbTensileShear
HexLHBM08#15/16 x 21/8 to 7/8 - 1-3/163/167/83/4178991124
HexLHBM08#25/16 x 2-3/47/8 to 1-5/8 - 1-15/163/167/83/4178991124
HexLHBM08#35/16 x3-9/161-5/8 to 2-3/8 - 2-11/163/167/83/4178991124
HexLHBM10#13/8 x 2-3/161/8 to 7/8 - 1-3/161/41-1/815/163319102248
HexLHBM10#23/8 x 2-3/47/8 to 1-5/8 - 1-7/81/41-1/815/163319102248
HexLHBM10#33/8 x 3-9/161-5/8 to 2-3/8 - 2-5/81/41-1/815/163319102248
HexLHBM12#11/2 x 2-3/81/8 to 1 - 1-3/81/41-1/41-3/165923603372
HexLHBM12#21/2 x 3-5/321 to 1-13/16 - 2-1/41/41-1/41-3/165923603372
HexLHBM12#31/2 x 41-13/16 - 2-3/4 - 3-1/81/41-1/41-3/165923603372
Hex (HCF)LHBM16#15/8 x 31/2 to 1-1/85/161-5/85/161-1/21-3/814047206744
Hex (HCF)LHBM16#25/8 x 41-1/8 to 25/162-1/25/161-1/21-3/814047206744
Hex (HCF)LHBM16#35/8 x 4-3/42 to 2-13/165/163-5/165/161-1/21-3/814047206744
Hex (HCF)LHBM20#13/4 x 3-9/161/2” to 1-5/165/161-15/163/821-13/1622178688992
Hex (HCF)LHBM20#23/4 x 4-3/41-5/16 - 2-3/85/1633/821-13/1622178688992
Hex (HCF)LHBM20#33/4 x 5-7/82-3/8 to 3-3/85/1643/821-13/1622178688992
CountersunkLHBCSKM08#15/16 x 21/8 to 7/8-1-3/163/167/83/4178991124
CountersunkLHBCSKM08#25/16 x 2-3/47/8 to 1-5/8-1-15/163/167/83/4178991124
CountersunkLHBCSKM08#35/16 x3-9/161-5/8 to 2-3/8-2-11/163/167/83/4178991124
CountersunkLHBCSKM10#13/8 x 21/8 to 7/8-1-3/161/41-1/815/163319102248
CountersunkLHBCSKM10#23/8 x 2-3/47/8 to 1 5/8-1-7/81/41-1/815/163319102248
CountersunkLHBCSKM10#33/8 x 3-9/161-5/8 to 2-3/8-2-5/81/41-1/815/163319102248
CountersunkLHBCSKM12#11/2 x 2-3/161/8 to 1-1-3/81/41-1/41-3/165923603372
CountersunkLHBCSKM12#21/2 x 3-5/321 to 1-13/16-2-1/41/41-1/41-3/165923603372
CountersunkLHBCSKM12#31/2 x 41-13/16 - 2-3/4-3-1/81/41-1/41-3/165923603372
Countersunk (HCF)LHBCSKM16#15/8 x 2-3/41/2 to 1-1/85/161-5/85/161-1/21-3/814047206744
Countersunk (HCF)LHBCSKM16#25/8 x 41-1/8 to 25/162-1/25/161-1/21-3/814047206744
Contrsnk (HCF)LHBCSKM16#35/8 x 4-3/42 to 2-13/165/163-5/165/161-1/21-3/814047206744

Code Approvals: 

ICC-ES ESR-3330 (pdf)

CE – Declaration of Performance (pdf)

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