STAUFF Hexagonal Rail Nut (Type SM – Standard Series)
The STAUFF Hexagonal Rail Nut (Type SM – Standard Series) is a fastening component designed in accordance with DIN 3015, Part 1. It is suitable for STAUFF Groups 1 to 8 and compatible with the Twin Series (Group 1D). Designed for installation on Type TS mounting rails, it ensures high-precision mechanical anchoring. It is available with ISO metric (M) or Unified UNC threads, in zinc/nickel-coated carbon steel (W3) and V2A (W4) or V4A (W5) stainless steel. The available product code families are: SM-1-8/1D-M-W3, SM-1-8/1D-U-W3, SM-1-8/1D-M-W4, SM-1-8/1D-U-W4, SM-1-8/1D-M-W5, SM-1-8/1D-U-W5.
The STAUFF Hexagonal Rail Nut (Type SM – Standard Series) is an essential mechanical fastening element in hydraulic systems, designed in strict compliance with the rigorous specifications of DIN 3015, Part 1. This component ensures secure and extremely stable anchoring for tubing within pressurised circuits. Its engineering makes it compatible with a wide range of diameters, natively covering STAUFF Groups 1 to 8, which correspond exactly to DIN Groups 0 to 8 (specifically: Group 1/DIN 0, Group 1A/DIN 1, and Groups 2 to 8 corresponding to DIN Groups 2 to 8). In addition, its structural versatility ensures compatibility with Twin Series systems, specifically for STAUFF Group 1D.
To flexibly meet different installation requirements in international markets, the nut is available with two main thread variants (Thread G). ISO metric thread can be selected, identified by code M, for example M6, and is the predominant standard in European industrial applications. Alternatively, the component can be supplied with Unified Coarse UNC thread, identified by code U, for example 1/4-20 UNC. The reference dimensions for the base size ensure a precise fit within the rail profile: length (L) of 25.5 mm (1.00 in), width (B) of 10.4 mm (.41 in), heights (H1 and H2) of 14.2 mm (.56 in) and 5.5 mm (.22 in) respectively, and a diameter (ØD) of 12 mm (.47 in).
The available nut materials reflect the need to operate in industrial environments with varying levels of chemical aggressiveness and mechanical stress. Material code W3 identifies the structural version made of Carbon Steel protected by a zinc/nickel-plated surface treatment, providing excellent resistance for standard applications. For more demanding operating environments, two distinct Stainless Steel options are available: the W4 version, manufactured from V2A stainless steel (grades 1.4301 / 1.4305, equivalent to AISI 304/303), and the W5 version, manufactured from V4A stainless steel (grades 1.4401 / 1.4571, equivalent to AISI 316/316 Ti), ensuring maximum durability in highly corrosive environments.
The correct operating principle requires use in combination with the dedicated Type TS Mounting Rail. Compatible mounting rails include the TS-11, TS-14 and TS-30 models, which differ in profile height: 11 mm (.43 in), 14 mm (.55 in) and 30 mm (1.18 in). These anchoring rails are supplied in standard lengths of 1 metre (1M / 3.28 ft) or 2 metres (2M / 6.56 ft). Material options for the rails range from uncoated carbon steel (W1) or hot-dip galvanised steel (W98) to the same W4 and W5 stainless steel versions. The combination of these guide elements with the precise fit of the SM nut prevents twisting and counteracts the loosening typically encountered in hydraulic systems.
| Feature | Value |
|---|---|
| Reference Standard | DIN 3015, Part 1 (Standard Series) |
| STAUFF Group Compatibility | From 1 to 8 |
| DIN Group Compatibility | From 0 to 8 |
| Twin Series Compatibility | STAUFF Group 1D |
| Thread Options (Code) | ISO Metric (M) / Unified Coarse UNC (U) |
| Material W3 | Carbon steel, zinc/nickel-plated |
| Material W4 | V2A stainless steel (1.4301/1.4305 – AISI 304/303) |
| Material W5 | V4A stainless steel (1.4401/1.4571 – AISI 316/316 Ti) |
| Associated Mounting Rail | Type TS (TS-11, TS-14, TS-30) |
| Product Code Family (SM Base Model) | Thread Type | Material and Treatment |
|---|---|---|
| SM-1-8/1D-M-W3 | ISO Metric | Carbon steel, zinc/nickel-plated (W3) |
| SM-1-8/1D-U-W3 | Unified Coarse UNC | Carbon steel, zinc/nickel-plated (W3) |
| SM-1-8/1D-M-W4 | ISO Metric | V2A stainless steel – AISI 304/303 (W4) |
| SM-1-8/1D-U-W4 | Unified Coarse UNC | V2A stainless steel – AISI 304/303 (W4) |
| SM-1-8/1D-M-W5 | ISO Metric | V4A stainless steel – AISI 316/316 Ti (W5) |
| SM-1-8/1D-U-W5 | Unified Coarse UNC | V4A stainless steel – AISI 316/316 Ti (W5) |