Overview
ISO 9904:2000 specifies the dimensions, characteristics and designation of steel pins recommended for spinning preparatory and spinning machinery. It covers standard pin types used across carding, hackling and other spinning preparatory processes, defining round pins (including notched), flat pins and flat pins with foot, plus basic diameter and length series for selection and replacement.
Key topics and requirements
- Pin types: Round pins (Types A, B and C), round pins with notch, flat pins (Types A and B) and flat pins with foot.
- Dimensional series: A basic diameter/section series is defined (code numbers 1–33), with diameters from about 7.62 mm down to 0.25 mm and lengths up to 50.8 mm (see standard tables and figures). Specific length and tolerance tables are provided for each pin type.
- Material and hardness: Material is steel (manufacturer’s choice) with specified Vickers hardness ranges:
- Round pins Nos. 1–20: 620 HV2 to 750 HV2
- Round pins Nos. 21–33: 700 HV2 to 800 HV2
- Flat pins: 670 HV2 to 735 HV2
- Surface finish: Surface roughness limits are specified by pin type (e.g., Types A and B round pins have finer Ra requirements than Type C). Flat-side roughness and special-face roughness values are given in the standard.
- Designation rules: Standardized designation format ensures unambiguous ordering and replacement. Example formats from the standard:
- Round pin: “Round pin ISO 9904 – B 16 – 25,4”
- Round pin with notch: “Round pin with notch ISO 9904 – 16 – 25,4 – K”
- Flat pin: “Flat pin ISO 9904 – B 17 × 23 – 22,23”
- Flat pin with foot: “Flat pin with foot ISO 9904 – 17 × 23 – 25,4 – F”
Applications and who uses it
- Textile OEMs and component manufacturers use ISO 9904 for designing and producing compatible steel pins for spinning preparatory and spinning machinery.
- Maintenance and procurement teams in spinning mills rely on the dimensional series and designation rules to source replacements and ensure machine uptime.
- Quality control and inspection laboratories use the hardness and surface-finish requirements to verify conformance (see related Vickers test standards).
- Useful in specifying spare parts, designing new combs/hackles/cards and ensuring international compatibility across machine suppliers.
Related standards
- ISO 6507-1:1997 - Metallic materials - Vickers hardness test - Part 1: Test method
- ISO 6507-2:1997 - Metallic materials - Vickers hardness test - Part 2: Verification of testing machines
Keywords: ISO 9904:2000, steel pins, textile machinery, spinning preparatory, spinning machinery, round pins, flat pins, Vickers hardness, pin dimensions, surface roughness.