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STAUFF Hexagon Socket Head Cap Screw (Type IS – Standard Series)
Designed in accordance with DIN 3015, Part 1 and ISO 4762, the STAUFF Hexagon Socket Head Cap Screws (Type IS – Standard Series) ensure secure fastening of hydraulic components. Intended exclusively for use with Type US washers and without a Type DP cover plate, they are available with ISO metric or UNC threads. Available in carbon steel (W3) or stainless steel (W4, W5). The available product codes are: IS-M6x20-W3, IS-M6x25-W3, IS-M6x30-W3, IS-M6x35-W3, IS-M6x50-W3, IS-M6x60-W3, IS-M6x90-W3, IS-M6x110-W3, IS-1/4-20UNCx3/4-W3, IS-1/4-20UNCx1-W3, IS-1/4-20UNCx1-1/8-W3, IS-1/4-20UNCx1-3/8-W3, IS-1/4-20UNCx2-W3, IS-1/4-20UNCx2-1/2-W3, IS-1/4-20UNCx3-3/8-W3,
STAUFF Hexagon Socket Head Cap Screw (Type IS – Standard Series)
The STAUFF Hexagon Socket Head Cap Screws (Type IS – Standard Series) are a high-precision fastening solution developed specifically for clamping systems and pipe clamp installations in the hydraulic sector. Designed in strict compliance with the construction requirements of DIN 3015, Part 1, these screws ensure robust assembly and reliable alignment of Standard Series components. The head geometry and hexagon socket design are manufactured in strict accordance with the international standards established by ISO 4762, as well as the North American ANSI/ASME B18.3 technical specifications, ensuring full dimensional compatibility with standardised tightening tools and optimal force transmission during installation.
From an operational installation perspective, the STAUFF Hexagon Socket Head Cap Screws (Type IS – Standard Series) are subject to clear and binding specifications for correct structural assembly. The technical data explicitly state that the dimensions listed in the catalogue apply exclusively when the screws are used without the upper Type DP cover plate. Furthermore, it is a fundamental system requirement that these Type IS hexagon socket head cap screws are used in combination with the dedicated Type US washers, which are available separately to complete the fastening assembly. Compliance with these parameters ensures the integrity of the clamp and the safety of the entire hydraulic fastening assembly.
To meet the different requirements of international markets and a wide range of system specifications, these fastening elements are supplied with two main thread options. The first option features an ISO metric thread, with dimensions ranging from M6 x 20 to M6 x 110. This dimensional range fully covers the requirements of all STAUFF Groups, from Group 1 to Group 8, corresponding respectively to DIN Groups 0 to 8. Alternatively, the Unified Coarse (UNC) thread is fully supported and available, with lengths ranging from 1/4-20 UNC x 3/4 to a maximum size of 1/4-20 UNC x 4-3/8. The availability of both thread types in the catalogue ensures flexible integration into both European metric systems and installations designed according to imperial standards.
The Standard Series fastening components are engineered to withstand a wide range of environmental conditions and are therefore manufactured from three main material categories, each identified by a specific STAUFF code. The standard base material, identified by the suffix W3, is carbon steel protected by a zinc/nickel-plated surface treatment. For system applications requiring greater protection, the W4 option is available in V2A stainless steel, corresponding to grades 1.4301 and 1.4305, commonly known as AISI 304 and AISI 303. Finally, for the most critical operating conditions, the W5 variant is manufactured from V4A stainless steel, corresponding to grades 1.4401 and 1.4571, equivalent to AISI 316 and AISI 316 Ti. Alternative materials and dedicated surface finishes are available upon request.
| Feature | Value |
|---|---|
| Product Type | Hexagon Socket Head Cap Screw (Type IS) |
| Reference Series | Standard Series (in accordance with DIN 3015, Part 1) |
| Screw Standard Compliance | ISO 4762 or ANSI/ASME B18.3 |
| Compatible STAUFF / DIN Groups | 1 to 8 (STAUFF) / 0 to 8 (DIN) |
| Available Threads | ISO Metric (M6) / Unified Coarse Thread (1/4-20 UNC) |
| 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) |
| Installation Requirements | Use with Type US washers. Values apply when used without a Type DP cover plate. |
| STAUFF Group | DIN Group | Metric Size | Metric Ordering Code (Material W3) | UNC Size | UNC Ordering Code (Material W3) |
|---|---|---|---|---|---|
| 1 / 1A | 0 / 1 | M6 x 20 | IS-M6x20-W3 | 1/4-20 UNC x 3/4 | IS-1/4-20UNCx3/4-W3 |
| 2 | 2 | M6 x 25 | IS-M6x25-W3 | 1/4-20 UNC x 1 | IS-1/4-20UNCx1-W3 |
| 3 | 3 | M6 x 30 | IS-M6x30-W3 | 1/4-20 UNC x 1-1/8 | IS-1/4-20UNCx1-1/8-W3 |
| 4 | 4 | M6 x 35 | IS-M6x35-W3 | 1/4-20 UNC x 1-3/8 | IS-1/4-20UNCx1-3/8-W3 |
| 5 | 5 | M6 x 50 | IS-M6x50-W3 | 1/4-20 UNC x 2 | IS-1/4-20UNCx2-W3 |
| 6 | 6 | M6 x 60 | IS-M6x60-W3 | 1/4-20 UNC x 2-1/2 | IS-1/4-20UNCx2-1/2-W3 |
| 7 | 7 | M6 x 90 (Upon request) | IS-M6x90-W3 | 1/4-20 UNC x 3-3/8 (Upon request) | IS-1/4-20UNCx3-3/8-W3 |
| 8 | 8 | M6 x 110 (Upon request) | IS-M6x110-W3 | 1/4-20 UNC x 4-3/8 (Upon request) | IS-1/4-20UNCx4-3/8-W3 |