A tensioning hook in black finished spring steel, designed to be loaded in sustained tension rather than simply to hang something. Continuous load rather than intermittent load is what dictates the wire size and the geometry here.
Designed around a continuous working tension rather than an occasional hanging load, which is a different calculation entirely.
Generous radii at the hook bends keep stress away from the levels that cause slow creep under permanent load.
Matches dark equipment hardware without the brightness of a plated hook.
Check tension hooks for opening at intervals rather than waiting for failure. Creep under permanent load is gradual and visible well before the hook lets go.
Hooks opening slowly under permanent tension rather than failing suddenly
Hooks specified for hanging loads being used for continuous tension
Dimensional and load figures are set per order against your drawing or sample, so they are marked TBC rather than filled with catalogue numbers.
| Product Type | Spring Hooks |
|---|---|
| Raw Material Options | Stainless steel, Spring steel, Carbon steel, 65Mn, Music wire |
| Wire Diameter Range | 0.1-8 mm |
| Surface Treatment Options | Zinc plating, Nickel plating, Silver plating, Gold plating, Tin plating, Galvanizing in various colours, Dacromet, Black oxide, Phosphating |
| Standard | ISO, non-standard and OEM drawings |
| Processing Route | Material sourcing → Coiling and forming → Heat treatment → Surface treatment → Quality inspection → Packing → Shipping |
| Inspection Equipment | Grinding and shot peening machinery; Precision tensile strength testers; Magnetic powder flaw detectors |
| Packing | Plastic bags, cartons or pallets, or packing to your own specification |
| Payment Terms | L/C, T/T, D/A, D/P, Western Union, 30% deposit before production, 70% balance before shipment |
| Lead Time | 7-15 days after the order is confirmed |
| Minimum Order Quantity | Quoted per part — tell us your requirement (TBC) |
| Dimensions and Load Rating | Made to your drawing or sample (TBC per part) |
Every batch follows the same seven step route, with tensile testing and magnetic powder flaw detection carried out before packing.
Available in Stainless steel, Spring steel, Carbon steel, 65Mn, Music wire, in wire from 0.1-8 mm, with any of our nine surface finishing routes. Geometry, end treatment and finish are all specified per order.
ISO 9001, SGS certificate and RoHS report (stated on the legacy site, certificates pending re-confirmation). Certificate copies are sent on request once re-confirmed.
Against a hanging hook of the same wire size, a tension hook is designed with more margin because the load never comes off it.
In design terms, yes. Sustained load allows less margin for creep, so wire size and radii are set differently.
Yes, and for permanent installations a closed end removes the risk of the hook working off its anchor.
Galvanised or stainless. Black finishes are for dry indoor positions.
Send your drawing, dimensions or a sample. We will confirm the specification and come back with a price and a lead time.
