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STAUFF Stacking Bolt / Stacking Stud (Type AF – Standard Series)
The STAUFF Stacking Bolt / Stacking Stud (Type AF – Standard Series) is designed for secure fastening in accordance with DIN 3015, Part 1. Used in combination with Type SIG safety locking plates, it is available in zinc/nickel-plated carbon steel (W3) or V2A (W4) and V4A (W5) stainless steel. It ensures reliable, space-saving assembly in hydraulic systems, with metric (M6) or UNC (1/4-20) thread options.
The available product codes (W3 family) are: AF-1/1A/1D-M-W3, AF-1/1A/1D-U-W3, AF-2-M-W3, AF-2-U-W3, AF-3-M-W3, AF-3-U-W3, AF-4-M-W3, AF-4-U-W3, AF-5-M-W3, AF-5-U-W3, AF-6-M-W3, AF-6-U-W3, AF-7-M-W3, AF-7-U-W3, AF-8-M-W3, AF-8-U-W3 (W4 and W5 variants are also available for the complete product family).
STAUFF Stacking Bolt / Stacking Stud (Type AF – Standard Series)
The STAUFF Stacking Bolt / Stacking Stud (Type AF – Standard Series) is a high-precision mechanical component essential for the correct assembly and stacking of pipe clamps in the hydraulic and fluid contamination control sectors. Designed in strict compliance with DIN 3015, Part 1, this technical connecting element enables the stacked installation of hydraulic pipes. This configuration optimises the available space within complex systems while maintaining high structural rigidity throughout the installation. This stud is intended exclusively for use in combination with the Type SIG Safety Locking Plate, ensuring a mechanically secured, anti-loosening connection that is critical in industrial applications continuously exposed to vibrations, pressure pulsations and significant mechanical stresses.
The advanced engineering of these stacking studs ensures maximum reliability in severe and demanding operating environments. The construction dimensions have been designed to provide standardisation: the hexagon size is 11 mm for all size groups, facilitating tightening, maintenance and installation operations using conventional tools and spanners. The material variants listed in the catalogue ensure maximum compatibility and durability across a wide range of operating environments and atmospheric conditions:
The versatility of the Standard Series is demonstrated by its complete dimensional coverage, with components available for the entire range of STAUFF Groups, from Group 1, including variant 1A, to Group 8. To accommodate different international assembly standards, each stud can be ordered with two different thread types. The first option is the ISO metric M6 thread, identified by Code M, while the second is the American Unified Coarse 1/4-20 UNC thread, identified by Code U.
The total stud lengths, indicated by dimension L1, vary proportionally according to the relevant STAUFF Group to compensate for the height of the clamp halves. Lengths start at a minimum of 34 mm for Groups 1 and 1A, increasing progressively to 40 mm for Group 2, 44 mm for Group 3, 49 mm for Group 4, 64 mm for Group 5, 74 mm for Group 6, 99 mm for Group 7 and reaching a maximum of 124 mm for Group 8. Despite the increase in total length, the minimum usable thread length (L3 min.) remains a constant design dimension of 12 mm for all sizes, always ensuring a safe and adequate anchoring depth in the plate or underlying component.
The STAUFF product coding system, for example AF-1/1A/1D-M-W3, follows a precise technical logic that facilitates identification during procurement. The prefix “AF” identifies the component type (Stacking Bolt). This is followed by the STAUFF Group reference, for example 1, 2, 3 through to 8. The third element in the code indicates the thread type, with “M” for Metric and “U” for UNC. Finally, the suffix identifies the construction material, namely “W3”, “W4” or “W5”. Alternative materials and surface finishes can be evaluated upon request according to the specific requirements of the system.
| Feature | Value / Detail |
|---|---|
| Product Type | Stacking Bolt / Stacking Stud (Type AF) |
| Reference Standard | Standard Series according to DIN 3015, Part 1 |
| Compatible STAUFF Groups | From Group 1, including 1A, to Group 8 |
| Compatible Components | Safety Locking Plate (Type SIG) |
| Thread Options (Thread G) | ISO Metric (M6) / Unified Coarse UNC (1/4-20 UNC) |
| Hexagon Size (Hex) | 11 mm (for all groups) |
| Usable Thread Length (L3 min.) | 12 mm (for all groups) |
| 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) |
| L1 Length Range | From 34 mm (Group 1/1A) to 124 mm (Group 8) |
| Model (W3 Product Code)* | STAUFF Group | Thread | Length L1 (mm) |
|---|---|---|---|
| AF-1/1A/1D-M-W3 | 1 / 1A | Metric (M6) | 34 |
| AF-1/1A/1D-U-W3 | 1 / 1A | UNC (1/4-20) | 34 |
| AF-2-M-W3 | 2 | Metric (M6) | 40 |
| AF-2-U-W3 | 2 | UNC (1/4-20) | 40 |
| AF-3-M-W3 | 3 | Metric (M6) | 44 |
| AF-3-U-W3 | 3 | UNC (1/4-20) | 44 |
| AF-4-M-W3 | 4 | Metric (M6) | 49 |
| AF-4-U-W3 | 4 | UNC (1/4-20) | 49 |
| AF-5-M-W3 | 5 | Metric (M6) | 64 |
| AF-5-U-W3 | 5 | UNC (1/4-20) | 64 |
| AF-6-M-W3 | 6 | Metric (M6) | 74 |
| AF-6-U-W3 | 6 | UNC (1/4-20) | 74 |
| AF-7-M-W3 | 7 | Metric (M6) | 99 |
| AF-7-U-W3 | 7 | UNC (1/4-20) | 99 |
| AF-8-M-W3 | 8 | Metric (M6) | 124 |
| AF-8-U-W3 | 8 | UNC (1/4-20) | 124 |
*Note: The listed codes refer to the W3 material configuration (zinc/nickel-plated carbon steel). Replacing “-W3” with “-W4” or “-W5” provides the V2A and V4A stainless steel versions for the entire product family.