ISO 4759-3:2016 PDF

Tolerances for fasteners — Part 3: Washers for bolts, screws and nuts — Product grades A, C and F

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Title (English):

ISO 4759-3:2016

Tolerances for fasteners — Part 3: Washers for bolts, screws and nuts — Product grades A, C and F

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 11
Publication date:: June 1, 2016
Edition:: ISO IS 4759 edition 4 version 1
ICS:: 21.060.30

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Description (English):

ISO 4759-3:2016 specifies tolerances for flat washers of product grades A, C and F with nominal diameters of 1 mm to 150 mm inclusive, designed to be used in bolted joints in combination with bolts, screws, studs and nuts. This part of ISO 4759 may be applied to non-flat washers however it does not include all the tolerances related to these washers. It applies to non-captive and captive washers, and to standard and non-standard washers. It does not apply to dynamic disc springs. Washers of product grades F and A are intended to be used with bolts, screws, studs and nuts of product grades A and B; washers of product grade C are intended to be used with bolts, screws, studs and nuts of product grade C. NOTE The product grade refers to a specific tolerance range related to dimensional and geometrical characteristics (product grade F for fine tolerances, product grade A for precise tolerances, product grade C for large tolerances). Annex A presents tolerances taken from ISO 286‑1 and ISO 286‑2.

Technical details

Technical committee: ISO/TC 2 - Fasteners
SKU: ISO 4759-3:2016

Abstract

Overview

ISO 4759-3:2016 - "Tolerances for fasteners - Part 3: Washers for bolts, screws and nuts - Product grades A, C and F" specifies dimensional and geometrical tolerances for flat washers (nominal diameters 1 mm to 150 mm) used in bolted joints. It covers non-captive and captive washers, standard and non‑standard washers, and can be applied (partially) to non‑flat washers. The standard defines three product grades: F (fine tolerances), A (precise tolerances) and C (large tolerances), and clarifies compatibility with bolt/screw/stud/nut product grades.

Key topics and technical requirements

Scope and applicability: Washers for bolts, screws, studs and nuts with nominal diameters 1–150 mm; excludes dynamic disc springs.
Product grades: Grade F (fine), A (precise), C (coarse) - each with defined tolerance ranges for dimensional and geometrical characteristics.
Dimensional tolerances:
- Clearance hole (d1) and outside diameter (d2) tolerances given by IT/H classes (see Annex A referencing ISO 286‑1/2).
- Thickness tolerances specified by ranges (e.g., t ≤ 0.5 mm…10–20 mm) and measured after burr removal.
- Chamfer dimensions and minimum values for inner/outer chamfers are specified (including optional captive-washer requirements).
Form and position tolerances:
- Flatness (deflection) z (effective height vs effective thickness) with limits by thickness and grade.
- Coaxiality y (concentricity between hole and outer diameter) based on IT grades.
- Thickness variation Δt limits on the same part at defined ring-width positions.
Manufacturing notes:
- Tolerances apply prior to coating.
- Rollover and fracture features from punching are allowed but may be undefined; specific fracture/rollover considerations are noted.
- Deviations are permitted only where product standards justify them; product standards take precedence.

Practical applications

Ensures interchangeability and fit of washers with bolts, screws, studs and nuts in mechanical assemblies.
Guides designers in specifying washer geometry and tolerance grades for performance and assembly clearance.
Provides inspection criteria for quality control and incoming‑goods inspection (thickness, flatness, coaxiality).
Used by manufacturers to set production tolerances, tooling specs and finishing operations (grinding/calibrating to meet flatness).

Who uses this standard

Fastener manufacturers and tooling designers
Mechanical and product engineers specifying bolted joints
Quality/inspection engineers and metrology labs
Procurement/specification writers for industrial components

Related standards

ISO 286‑1 / ISO 286‑2 (tolerance grades and limit deviations) - referenced in Annex A
ISO 1101 and ISO 2692 (geometrical tolerancing and MMR/LMR reciprocity) - normative references

Keywords: ISO 4759-3:2016, washers tolerances, fasteners, product grades A C F, flat washers, clearance hole, chamfer tolerances, thickness tolerances, flatness, coaxiality, ISO 286.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and technical requirements

Scope and applicability: Washers for bolts, screws, studs and nuts with nominal diameters 1–150 mm; excludes dynamic disc springs.
Product grades: Grade F (fine), A (precise), C (coarse) - each with defined tolerance ranges for dimensional and geometrical characteristics.
Dimensional tolerances:
- Clearance hole (d1) and outside diameter (d2) tolerances given by IT/H classes (see Annex A referencing ISO 286‑1/2).
- Thickness tolerances specified by ranges (e.g., t ≤ 0.5 mm…10–20 mm) and measured after burr removal.
- Chamfer dimensions and minimum values for inner/outer chamfers are specified (including optional captive-washer requirements).
Form and position tolerances:
- Flatness (deflection) z (effective height vs effective thickness) with limits by thickness and grade.
- Coaxiality y (concentricity between hole and outer diameter) based on IT grades.
- Thickness variation Δt limits on the same part at defined ring-width positions.
Manufacturing notes:
- Tolerances apply prior to coating.
- Rollover and fracture features from punching are allowed but may be undefined; specific fracture/rollover considerations are noted.
- Deviations are permitted only where product standards justify them; product standards take precedence.

Practical applications

Ensures interchangeability and fit of washers with bolts, screws, studs and nuts in mechanical assemblies.
Guides designers in specifying washer geometry and tolerance grades for performance and assembly clearance.
Provides inspection criteria for quality control and incoming‑goods inspection (thickness, flatness, coaxiality).
Used by manufacturers to set production tolerances, tooling specs and finishing operations (grinding/calibrating to meet flatness).

Who uses this standard

Fastener manufacturers and tooling designers
Mechanical and product engineers specifying bolted joints
Quality/inspection engineers and metrology labs
Procurement/specification writers for industrial components

Related standards

ISO 286‑1 / ISO 286‑2 (tolerance grades and limit deviations) - referenced in Annex A
ISO 1101 and ISO 2692 (geometrical tolerancing and MMR/LMR reciprocity) - normative references

Keywords: ISO 4759-3:2016, washers tolerances, fasteners, product grades A C F, flat washers, clearance hole, chamfer tolerances, thickness tolerances, flatness, coaxiality, ISO 286.

ISO 4759-3:2016 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Practical applications

Who uses this standard

Related standards

Related standards

Abstract

Overview

Key topics and technical requirements

Practical applications

Who uses this standard

Related standards

Related standards

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