Overview
EN ISO 2338:1997 (ISO 2338:1997) specifies the characteristics, dimensions and basic requirements for parallel pins (cylindrical pins) made of unhardened steel and austenitic stainless steel. The standard covers nominal diameters from 0.6 mm to 50 mm and a commercially used series of nominal lengths. It is a product standard widely used by designers, manufacturers and purchasers of fasteners and locating elements.
Key topics and technical requirements
- Scope and sizes
- Nominal diameters d = 0.6 mm to 50 mm inclusive.
- Nominal lengths provided in a standard series (table of lengths up to and beyond 200 mm; above 200 mm lengths in 20 mm steps).
- Tolerances and fit
- Typical tolerance classes referenced: m6 and h8. Dimensional tolerances are specified in the standard’s tables.
- All dimensional tolerances apply prior to plating or coating.
- Material and hardness
- Unhardened steel (St): hardness range 125 HV30 to 245 HV30.
- Austenitic stainless steel (grade A1): hardness range 210 HV30 to 280 HV30, with mechanical properties referenced to ISO 3506-1.
- Surface finish and coatings
- Pins are normally supplied plain (natural finish) or, by agreement, with coatings.
- Preferred coatings for steel pins: black oxide, phosphate, or zinc plating with chromate conversion (see ISO 9717 and ISO 4042).
- Surface roughness targets: for m6 **R
