Overview
ISO 9448-2:2013 specifies the main dimensions and tolerances (in millimetres) for guide bushes of Form A - plain, gliding bushes (type 1) - intended for use in press tools. The standard defines how these bushes are to be mounted (interference fit in the clamp plate), gives guidance on materials, prescribes the required hardness, and sets out the designation format for compliant parts.
Key Topics and Requirements
- Scope: Applies to Form A, plain gliding guide bushes, type 1, for press tooling.
- Dimensions & tolerances: Main sizes, lengths and dimensional tolerances are given (see Figure 1 and Table 1 in the standard). Surface roughness values are indicated in micrometres in the figure.
- Mounting fit: Designed to be mounted in the clamp plate by interference fit (hole tolerance H7 recommended). When bushes are glued, tolerance j6 may be permitted.
- Material & hardness: Material choice is left to the manufacturer; however, the hardness is specified at 60 HRC.
- Standard designation: Format for marking/ordering:
Example - “Bague de guidage ISO 9448-2 A – 12 × 25” (Guide bush ISO 9448-2 A – D × l), where D is guide diameter and l is length in mm.
- Recommended diameters: To help prevent incorrect assembly of upper and lower die shoes, recommended D values include 11, 15, 19, 24, 30, 38 and 48 mm.
- Documentation: Bibliography references include ISO 6508-1 (Rockwell hardness test method) for hardness verification.
Applications and Users
This standard is practical for professionals and organizations involved in:
- Press-tool and die design - selecting and specifying standardized guide bushes.
- Tool and die manufacturers - producing or sourcing compliant guide bush dimensions and surface finish.
- Maintenance and repair of presses - replacing worn bushes with correctly sized, hardened parts.
- Quality assurance and procurement - verifying tolerances, fit (H7 / j6), and hardness (60 HRC).
- OEMs and component suppliers - ensuring interchangeability and consistent performance in stamping and forming operations.
Benefits include improved interchangeability, reduced risk of mismatched parts in die assemblies, and predictable wear behavior due to specified hardness.
Related Standards
- ISO 9448 (series) - other parts cover different forms and types (Parts 1, 3–11 address alternative shapes, collars, ball-guided variants and type 2 versions).
- ISO 6508-1 - Rockwell hardness test method referenced for hardness compliance.
Keywords: ISO 9448-2:2013, guide bushes, guide bush dimensions and tolerances, press tools, gliding bushes, hardness 60 HRC, H7 interference fit, guide bush designation.
