ISO 13012-2:2018

Overview

ISO 13012-2:2018 - Rolling bearings - Accessories for sleeve type linear ball bearings - Part 2 - specifies boundary dimensions, geometrical product specifications (GPS) and tolerances for accessories used with series 5 sleeve type linear ball bearings. Published as the second edition in 2018, this machine-element geometry standard defines the nominal sizes and tolerance/positioning rules for housings, shaft support rails, flanged shaft support blocks and solid or tubular shafts used with ISO 10285 sleeve type linear ball bearings.

Key topics and technical requirements

• Scope of parts covered
  • Closed and adjustable flangeless housings (series 5)
  • Open and open-adjustable flangeless housings (series 5)
  • Standard-height shaft support rails
  • Flanged shaft support blocks
  • Solid and tubular shafts for series 5 bearings
• Boundary dimensions and nominal features
  • Seating diameter (D), overall widths/heights (A, H), housing lengths (L), bolt centre distances (J), bolt/hole diameters (N), shaft centreline heights, etc. (referenced in figures and tables)
• Geometrical Product Specifications (GPS)
  • Position tolerances (symbols p1, p2, p3), angular features (α, β), and ISO GPS-compliant tolerance indications
  • Geometric form requirements and two-point size rules per ISO 14405-1
• Shaft material and treatment guidance
  • References for surface-hardened and through-hardened shafts and layer thickness measurement (ISO 18203)
  • Guidance on chamfers, shaft length tolerances, surface roughness and tolerance classes
• Measurement and conformity
  • GPS rules (ISO 8015) and decision rules (ISO 14253-1) apply
  • Measurement uncertainty considerations per ISO 14253-2

Applications and who uses it

ISO 13012-2:2018 is intended for:

• Bearing and accessory manufacturers (for consistent production and interchangeability)
• Mechanical designers and machine builders specifying linear motion systems (automation, robotics, CNC machines, conveyors)
• Quality, metrology and inspection labs verifying dimensions and positional tolerances
• Procurement and regulatory teams requiring standardized part descriptions and conformity evidence

Using this standard helps ensure smooth, accurate, low-friction linear motion by enabling correct selection and matching of housings, shafts and supports to sleeve type linear ball bearings.

Related standards

• ISO 10285 - Sleeve type linear ball bearings (boundary dimensions and tolerances)
• ISO 8015 - Fundamental GPS rules
• ISO 14253-1 / ISO 14253-2 - Decision rules; measurement uncertainty
• ISO 18203 - Determination of hardened layer thickness

Keywords: ISO 13012-2:2018, rolling bearings, sleeve type linear ball bearings, series 5, geometrical product specifications, GPS, boundary dimensions, tolerances, housings, shaft support rails, shaft support blocks, shafts.