ISO 4208-1977 PDF
Name in English:
St ISO 4208-1977
Name in Russian:
Ст ISO 4208-1977
Original standard ISO 4208-1977 in PDF full version. Additional info + preview on request
Full title and description
ISO 4208:1977 — Detachable pilots for use with counterbores and 90 degrees countersinks — Dimensions. Specifies the dimensional sizes and related illustrations for detachable pilots intended for use with counterbores and 90° countersinks (Morse taper shanks); metric units are given as the recommended dimensions.
Abstract
This standard defines the nominal dimensions and diagrammatic outline for detachable pilots used with counterbores and 90° countersinks (primarily with Morse taper shanks). It provides metric-only dimensions and guidance intended to standardize pilot sizes for interoperability with compatible cutters and tool-holders.
General information
- Status: Withdrawn.
- Publication date: 1977 (Edition 1 — published August/July 1977).
- Publisher: International Organization for Standardization (ISO).
- ICS / categories: 25.100.30 (Drills, countersinks, reamers).
- Edition / version: Edition 1 (ISO 4208:1977).
- Number of pages: Short national/international pamphlet (ISO record shows 1 page).
Scope
Specifies the dimensions of detachable pilots for use with counterbores and 90° countersinks with Morse taper shanks; these pilots may also be used with other types of cutters. The standard gives metric dimensions only and includes a diagrammatic illustration (not intended to prescribe detailed design features beyond the dimensional data provided).
Key topics and requirements
- Standardized nominal dimensions for detachable pilots used with counterbores and 90° countersinks (metric units only).
- Application to pilots with Morse taper shanks; compatibility notes for other cutter types.
- Diagrammatic illustrations to clarify dimensional relationships (not prescriptive of detailed design).
- Short technical specification intended for consistency/interchangeability of pilots and mating cutters or holders.
Typical use and users
Tool manufacturers, tooling designers, precision machinists, and procurement/specification specialists use this kind of dimensional standard when selecting or manufacturing detachable pilots and compatible counterbores or countersinks. It is also used by standards bodies and technical libraries for cross-referencing tooling dimensions.
Related standards
ISO 4208:1977 is part of a family of ISO documents addressing countersinks, counterbores and pilots (for example ISO 4204, ISO 4205, ISO 4206 and ISO 4207 in the 3000–4999 series). Several of the related tooling standards have more recent editions (many updated or reissued in 2016), and some earlier 1970s-era documents were withdrawn or superseded during systematic reviews. Users should check current ISO catalogue entries for the latest, active documents in this tooling series.
Keywords
detachable pilot, counterbore, countersink, 90 degrees, Morse taper, dimensions, tooling standard, ISO 4208, pilot sizes
FAQ
Q: What is this standard?
A: ISO 4208:1977 is an ISO international standard that specified dimensions for detachable pilots used with counterbores and 90° countersinks (primarily with Morse taper shanks).
Q: What does it cover?
A: It covers the nominal dimensional sizes and a diagrammatic illustration for detachable pilots intended to fit counterbores and 90° countersinks; metric units are given as the recommended dimensions.
Q: Who typically uses it?
A: Toolmakers, tooling designers, machinists and specification authors—anyone needing standardized pilot dimensions for manufacturing, procurement or compatibility checks.
Q: Is it current or superseded?
A: ISO 4208:1977 is recorded as withdrawn in the ISO catalogue lifecycle. Users should refer to the ISO catalogue or current tooling-series standards (e.g., the later ISO documents in the 4204–4207 range) to find active replacements or updated specifications.
Q: Is it part of a series?
A: Yes — it belongs to a cluster of ISO standards covering countersinks, counterbores and pilot arrangements (numbers in the ISO 4204–4208 range); several of these related standards have been revised or reissued since 1977.
Q: What are the key keywords?
A: Detachable pilot; counterbore; countersink; Morse taper; dimensions; tooling; ISO 4208.