Scaffolding Tube – Steel Tube is supplied in 48.3mm Outside Diameters (O/D) and is manufactured to BS EN 1139 European standard.

Scaffolding Tube – Steel Tube is Hot Dipped Galvanised to BS EN 10240 standards and has a wall Thickness of 4.0mm.

Scaffolding Tube – Steel Tube is supplied in various lengths including:

20ft (6.1Metres), 16ft (4.88 Metres), 13ft (3.96 Metres), 10ft (3.05 Metres), 8ft (2.44 Metres), 7ft (2.13 Metres), 5ft (1.52 Metres), 4ft (1.22 Metres), and 3ft (0.91Metres).

Free Cutting Service – Up to 20 cuts free, then a cutting charge will apply, minimum charge £15 ex Vat

Scaffolding Tube is specified for all Load Bearing Scaffolding structures where personnelare involved. We also offer Aluminium Scaffolding Tube – Alloy Tube in 48.3mm O/D in various lengths including 6m, 3m, 2m, 1.5m & 1.0m.

Properties and capacities |

**Properties of standard scaffold tubes**

in accordance with TG20 / BS 5973: 1993 / BS 1139 – 1.2 / BS EN 12811-2

Outside diameter =
Wall thickness = Cross sectional area = Mass = Inertia = r = Zp (S in TG20) = Ze = Allowable bending moment = Allowable shear = Min yield strength = Modulus of elasticity = |
Steel tube (as new U.N.O.):48.3 (+/- 0.5) mm 4.0 (+0.47/-0.4) mm 5.57 cm2 4.37 kg/m 13.8 cm4 1.57 cm 7.87 cm3 5.7 cm3 1.12 (used tubes: 0.99) kNm 26.1 (used tubes: 23.3) kN 235 N/mm2 210000 N/mm2 |
Aluminium tube:48.3 (+/- 0.5) mm4.47 (+0.56) mm 6.15 cm2 1.67 (-7.5%) kg/m 14.9 cm4 1.56 cm 8.61 cm3 6.18 cm3 1.33 kNm 25.5 kN 255 N/mm2 70000 N/mm2 |

**Allowable scaffold tube strut loads**

(based on ‘as new’ scaffold tube as given above) in accordance with TG20

Effective length:
0.6 m
0.8 m 1.0 m 1.2 m 1.4 m 1.6 m 1.8 m 2.0 m 2.2 m 2.4 m 2.6 m 2.8 m 3.0 m 3.2 m 3.4 m 3.6 m 3.8 m 4.0 m |
Safe axial load:
Steel tube70.9 kN
65.0 kN 58.6 kN 51.9 kN 45.3 kN 39.2 kN 33.7 kN 29.1 kN 25.3 kN 22.0 kN 19.3 kN 17.1 kN 15.2 kN 13.6 kN 12.2 kN 11.0 kN 10.0 kN 9.1 kN |
Safe axial load:
Aluminium tube79.3 kN
64.8 kN 48.9 kN 36.5 kN 27.9 kN 21.8 kN 17.5 kN 14.4 kN 12.0 kN 10.1 kN 8.7 kN 7.5 kN 6.6 kN 5.8 kN 5.2 kN 4.6 kN 4.2 kN 3.8 kN |

**Properties of scaffold boards**

in accordance with TG20 / BS 2482:1981

Width =
Thickness = Mass per unit length = Mass per unit area = Max support = Min section modulus = Allowable B.M. (1 board) = Allowable B.M. (4 boards) = Board overhand – min = Board overhand – max = |
Standard225 mm 38 (+/- 2) mm 6 kg/m 25 kg/m2 1.2 m (+100mm) 47.5 cm3 0.48 kNm 0.71 kNm 50 mm 150 mm |
Super Boards225 mm 38 (+/- 2) mm 6 kg/m 25 kg/m2 1.5 m (+100mm) 47.5 cm3 0.63 kNm 1.01 kNm 50 mm 150 mm |
Omega Timber Batten225 mm 63 (+/- 3) mm 10 kg/m 41 kg/m2 2.5 m 132 cm3 1.30 kNm 1.30 kNm 50 mm 250 mm |

**Scaffold coupler**

**safe working loads**

in accordance with TG20 / EN 74 / tests by others

Coupler type:Right angle coupler (Class A) = Right angle coupler (Class B) = SGB MK3A right angle = Swivel coupler (Class A) = Sleeve coupler (Class A) = Sleeve coupler (Class B) = Parallel coupler (Class B) = Putlog coupler = SGB Brace D/H = Spigot pin = Adjustable base / FH = |
Slipping force6.1 kN 9.1 kN 12.5 kN 6.25 kN 3.60 kN 5.45 kN 6.10 kN 0.63 kN 5.0 kN – – |
Shear– – – – – – – – – 21 kN – |
Axial– – – – – – – – – – 30 kN |

**Steel Scaffold Beams**

in accordance with BS 449 / BS 5973

Beam type:Ladder Unit Layher 450 mm Layher 750 mm |
Iyy2600.0 cm4 10572.0 cm4 4481.0 cm4 13702.0 cm4 |
Self weight0.1275 kN/m 0.1300 kN/m 0.1000 kN/m 0.1600 kN/m |
Max allowable B.M.13.70 kNm 27.70 kNm 24.98 kNm 55.16 kNm |
Max allowable shear18.0 kN 20.0 kN 18.54 kN 27.27 kN |

*NOTE: Beam capacity is a function of spacing of lateral bracing. This to be provided in accordance with manufacturer’s specification.*

**Aluminium Scaffold Beams
**based on manufacturers’ specification

Beam type:Combisafe Ubix 450 ASP 610 ASP 750 Combisafe Ubix 780 Haki 450 Haki 750 Layher 450 Layher 750 Rux 450 Apollo Cradle X |
Iyy4957.86 cm4 16563.1 cm4 17340.8 cm4 17340.8 cm4 4483.0 cm4 17182.0 cm4 4481.0 cm4 15195.0 cm4 not given not given |
Self weight0.045 kN/m 0.060 kN/m 0.060 kN/m 0.060 kN/m 0.050 kN/m 0.074 kN/m 0.050 kN/m 0.060 kN/m not given not given |
Max allowable B.M.19.60 kNm 18.50 kNm 43.80 kNm 36.50 kNm 15.70 kNm 41.90 kNm 13.94 kNm 42.50 kNm 18.12 kNm 42.90 kNm |
Max allowable shear17.10 kN 24.00 kN 31.50 kN 30.70 kN 12.70 kN 30.60 kN 12.32 kN 25.60 kN 9.70 kN 45.40 kN |

*NOTE: Beam capacity is a function of spacing of lateral bracing. This to be provided in accordance with manufacturer’s specification.*

NOTE: ASP was bought by Combisafe and now only Ubix 450 (previously ASP 450) and Ubix 780 (previously ASP 780) are available. Other ASP sizes are listed for reference.

NOTE: ASP was bought by Combisafe and now only Ubix 450 (previously ASP 450) and Ubix 780 (previously ASP 780) are available. Other ASP sizes are listed for reference.

Main scaffolding terms |

**Anchor –**an element that transfers forces between a scaffolding tie and a supporting structure. Can be temporary or permanent.

**Base Plate –**a rigid plate under a standard, used to spread reaction.

**Bay**– space between two adjacent standards along face of a scaffold.

**Bay Length**– distance between centres of two adjacent standards.

**Coupler**– an element that connects two scaffold tubes together.

**Ledger**– a longitudinal scaffold tube (normally) parallel to a building face. Supports putlogs or transoms, and frequently for ties and ledger braces. Usually connected to adjacent standards.

*Perpendicular to transoms.*

**Putlog**– a scaffold tube with flattened end. Rests in or on part of a brickwork structure.

**Safe working moment**– is a characteristic moment of resistance divided by a factor of safety.

**Scaffold tube**– any tubular element of a scaffold: standard, ledger, transom etc.

**Standard**– a vertical scaffold tube.

**Swivel coupler**– a coupler for joining tubes at an angle (i.e. other than at a right angle).

**Tie**– connects a scaffold to an anchor.

**Transom**– a scaffold tube spanning across ledgers and supporting scaffold boards forming a working platform or connecting outer standards to inner standards.

*Perpendicular to scaffold boards.*

**Working load**– a load that can be safely carried by a structural member.