ASTM F436 is the standard cited for structural washers, hardened (astm f436). This page sets out what the standard controls for this part, reproduces the dimensional table supplied against it, and notes the related designations referenced on drawings.
ASTM F436 — Scope
ASTM F436 specifies the dimensional requirements for structural washers, hardened (astm f436).
Material, surface condition and any performance rating are set by separate documents specific to this part family — ISO 898-1 and ISO 898-2, which govern bolt and nut property classes, do not apply here.
Tolerance & Product Grades
Tolerances for structural washers, hardened (astm f436) are given as limits on the individual dimensions in the table rather than as a fastener product grade.
Where a general-tolerance class is cited on the drawing instead, it applies to the dimensions not otherwise toleranced.
Dimensions Specified by ASTM F436
| For bolt size | Inner diameter (in) | Outer diameter (in) | Thickness (in) | Hardness (HRC) | Type | Finish | Reference standard |
|---|
Companion Standards
ASTM F436 controls only the geometry of structural washers, hardened (astm f436). Surface finish is governed by separate finish standards (for example ISO 4042 for electroplating), and corrosion testing by ISO 9227 (neutral salt spray). Mechanical performance is set by the standards specific to this part family, not by ISO 898-1 or ISO 898-2, which apply to bolts, screws and nuts.
When to Specify ASTM F436
Choose ASTM F436 for international engineering work and OEM supply where ISO standards are the contractual reference. It is the default modern specification for structural washers, hardened (astm f436).
