Overview
ISO 7794:2011 - "Cross-country skis - Ski-binding screws - Requirements" specifies the dimensions, mechanical properties, mounting and fastening characteristics of screws used to mount ski bindings on cross-country skis. The standard aims to rationalize and improve safety of binding mounting by standardizing drill hole diameters, penetration depths, screw geometry and torque characteristics so manufacturers, service shops and installers use consistent, reliable components and procedures.
Key topics and requirements
- Scope: Screws for mounting cross-country ski bindings (designation XCSBS ISO 7794 - nominal diameter × length and head type).
- Materials: Steel complying with ISO 2702; additional requirements in ISO 7794 apply.
- Head type: Cross-recess type Z No. 3 (ISO 4757 recommended).
- Penetration depth: Recommended minimum 2.72 mm to 3.18 mm.
- Nominal major diameter: 6.3 mm (with tolerance as shown in the standard). Thread should extend up to the head or be at least 1 mm longer than penetration depth.
- Drill diameter (mounting): Uniform drill diameter 3.6 mm (+0.15/0).
- Torque characteristics:
- Driving torque ≤ 2 N·m (maximum moment to drive screw into hole without lubrication/tapping).
- Stripping torque ≥ 3.5 N·m (moment causing damage to internal thread).
- Fastening performance: Mean static pull-out resistance must be at least that of a reference screw per ISO 1478 type F, diameter 6.3 mm.
- Surface protection: Coating/plating to provide corrosion protection and reproducible friction (example: zinc electroplate Fe/Zn 5c with chromate conversion per ISO 4042, with specified thickness and precautions against hydrogen embrittlement).
- Testing: Strength and application characteristics tested per ISO 7795.
Practical applications and users
- Ski manufacturers: Specify mounting areas, reinforcement and penetration allowances during ski construction.
- Binding manufacturers: Design mounting interfaces compatible with standardized screws and torque settings.
- Fastener producers: Manufacture screws to defined dimensions, materials and coatings.
- Ski service shops and installers: Use consistent drill sizes and torque-limiting screwdrivers (single torque setting across skis), reducing installation errors.
- Test labs & compliance teams: Validate torque, pull-out and coating requirements per ISO 7795 and related standards.
Related standards
- ISO 1478 - Tapping screws thread (reference for performance)
- ISO 2702 - Heat‑treated steel tapping screws - Mechanical properties
- ISO 7795 - Cross-country skis - Ski-binding screws - Test methods
- ISO 4042 - Fasteners - Electroplated coatings
- ISO 4757 - Cross recesses for screws
Keywords: ISO 7794, cross-country ski, ski-binding screws, mounting screws, driving torque, stripping torque, penetration depth, drill diameter, corrosion protection, torque-limiting screwdriver.
