Product and application brief
Hose clamps secure a flexible hose around a fitting. Their closure mechanism distinguishes the main product forms; a similar diameter alone does not make two clamps interchangeable. This range covers standard clamp patterns and drawing-based band or closure variations.
Product forms and reference names
| Product form / field | Reference and distinguishing details |
|---|---|
| Worm drive hose clamps | A screw engages the band to adjust the loop. NORMA TORRO is a manufacturer reference; its embossed worm-drive range cites DIN 3017. Perforated and embossed bands are different constructions. |
| T-bolt hose clamps | A threaded T-bolt and nut close the band. Plain and spring-loaded closures are separate variants; specify the exact construction. |
| Trunnion clamps | NORMA GBS is a maker series reference for a bolted trunnion-style closure, not a universal standard number. |
| Spring band hose clamps | A one-piece spring band rather than a worm screw. NORMA FBS is a maker reference; its clamp size must be identified separately from adjustable-band ranges. |
Diameter means a working range
For an adjustable clamp, state the minimum and maximum clamping diameter in millimetres. Also identify the assembled hose outside diameter over the fitting. A nominal hose bore is not the clamp diameter.
Band and closure materials
Specify the band, housing, screw, bolt and nut materials separately. A stainless band does not by itself establish that the entire assembly is stainless. State the finish and any requested material designation rather than relying on a catalog nickname.
Standard and custom patterns
For a standard item, include the product form and selected reference. For a custom clamp, show the band profile, closure arrangement and dimensional tolerances. Operating suitability and installation instructions depend on the selected product; no pressure or torque rating is inferred here.
Specification fields
| Product form / field | Reference and distinguishing details |
|---|---|
| Size | Clamping diameter range; assembled hose outside diameter; mm or inch units. |
| Band | Width, thickness, perforated or embossed pattern and edge requirements. |
| Closure | Worm screw, T-bolt, trunnion or spring band; screw head and thread where applicable. |
| Material / finish | Separate requirements for band, housing, screw and other metal components. |
| Reference / quantity | Standard edition or maker reference, drawing revision, quantity and units. |
Common product questions
Are worm-drive and T-bolt clamps equivalent?
No. Their closures and band construction differ. Compare the complete specification, not only the diameter.
Is TORRO or GBS a standard number?
No. These are NORMA manufacturer series names. They help identify a construction, but do not establish universal interchangeability.
What size should I specify?
Use the required clamping range and the assembled hose outside diameter, with explicit units. Do not use hose bore alone.
Related clamps and clips
Product references
References checked 5 October 2026 explain product identity. Third-party model names and approvals are not FastenerBridge brand affiliation, stock or certification claims. Final geometry and requirements follow the selected specification.