**Materials & Variants**
– Standard material: Cast iron, with option for stainless steel (304 or 316) for corrosive environments
– Surface & finish: As cast, with machining where needed for grub screw holes and internal bore tolerances
**Design & Features**
– Slidable over the matching tube external diameters and fastened with grub screws to lock position
– Designed for ease of assembly and future modification: no welding or hammering required
– Compatible with the full range of tube sizes (½″, 1″, 1¼″, 1½″, 2″) in the associated support tubing line
**Fitting Types (as per catalogue)**
– **Base fittings**: for vertical tube anchoring, include holes for foundation mounting
– **Couplers**: join two tube segments to extend length (e.g., CL25, CL30, CL40, CL50) with dimensions H and H1 specified
– **Bends / Elbows**: used to change direction in frame geometry (BN25, BN30, BN40, BN50)
– **Tees / Cross / Double-tees / Double bends**: to create branch connections in frame grid
– **Brackets / Supports** (equal, unequal) for offset or angled support arms
– **Plugs**: to cap open ends of tubes (PLUG sizes for NB 15, 25, 30, 40, 50)
– **Studs**: threaded rods for attachment of additional supports (STUD5/16-150, STUD3/8-150, STUD1/2-200)
**Structural Guidelines**
– Fitting internal bores match external diameters of tubes to ensure snug fit
– Grub screws must be tightened after frame alignment to ensure rigidity
– For heavier loads or larger spans, additional bracing and firmer joints are recommended
– Select stainless variants in corrosive or high-humidity environments to reduce corrosion risk