ISO 11381-2016 PDF

Full title and description

Ophthalmic optics — Spectacle frames — Screw threads (ISO 11381:2016). Specifies ISO metric and miniature screw-thread sizes, tolerances and related requirements for screws, taps and gauges used in spectacle-frame manufacture and repair, ensuring interchangeability of small fasteners in eyewear components.

Abstract

ISO 11381:2016 defines the nominal thread sizes, pitches and tolerance classes for screw threads used in spectacle frames (including one miniature size S0,8 × 0,2 and metric sizes M1.0–M2.0), plus requirements for related taps and gauges, screw length definitions and tolerances. The standard supports consistent assembly and inspection of miniature threaded parts in ophthalmic optics.

General information

• Status: Published (Edition 2) — confirmed at review.
• Publication date: October 2016 (2016-10).
• Publisher: ISO (International Organization for Standardization).
• ICS / categories: 11.040.70 (Ophthalmic equipment).
• Edition / version: Edition 2 (2016).
• Number of pages: 4 (concise International Standard text).

Scope

Applies to ISO metric and a specified miniature screw thread for use with spectacle frames. The standard covers the nominal sizes S0,8 × 0,2 and metric sizes M1,0 × 0,25; M1,2 × 0,25; M1,4 × 0,3; M1,6 × 0,35; and M2,0 × 0,4, and gives requirements for classes of fit, screw length definitions and tolerances, and related taps and gauges where applicable. It is intended for designers, manufacturers, suppliers and inspectors of spectacle-frame components.

Key topics and requirements

• Nominal thread sizes and pitches: S0,8 × 0,2 plus M1.0, M1.2, M1.4, M1.6 and M2.0 with specified pitches.
• Tolerance classes and classes of fit for nuts and screws (examples and tables for 6H/6h designations where applicable).
• Requirements and references for taps and gauges: taps for M1.0–M2.0 to follow ISO 529, gauges to ISO 1502; S0,8 × 0,2 follows miniature-thread practice (ISO 1501) and has special considerations.
• Screw head types and nominal length definitions (flat, countersunk, fillister, pan/cheese) and the nominal length tolerance typically 0 mm to −0.15 mm unless otherwise specified.
• Informative guidance (annex) linking common thread sizes to typical frame uses (hinges, pads, joint/closing blocks) to aid selection and interchangeability.

Typical use and users

Used by spectacle-frame designers, ophthalmic-laboratory technicians, frame manufacturers, fastener and tooling suppliers, quality-control and inspection personnel, and standards/procurement teams that specify compatible miniature screws, taps and gauges for eyewear production, repair and servicing. The standard helps reduce mismatches, warranty failures and assembly issues due to incompatible threads.

Related standards

Commonly referenced standards include ISO 1501 (miniature screw threads), ISO 965‑3 (tolerances for constructional metric threads), ISO 529 (taps) and ISO 1502 (gauges and gauging); also regional/adopted versions such as EN ISO 11381 where applicable.

Keywords

spectacle frames, ophthalmic optics, screw threads, miniature threads, M1.6×0.35, S0.8×0.2, taps, gauges, thread tolerances, interchangeability.

FAQ

Q: What is this standard?

A: ISO 11381:2016 is an International Standard that specifies screw-thread sizes, fits, length definitions and associated requirements specifically for spectacle-frame components (eyewear).

Q: What does it cover?

A: It covers one miniature thread size (S0,8 × 0,2) and metric thread sizes from M1.0 to M2.0 with their pitches, classes of fit for nuts and screws, screw-length definitions and tolerances, and requirements or references for taps and gauges used in eyewear manufacture and repair.

Q: Who typically uses it?

A: Frame designers, manufacturers, repair technicians, component and fastener suppliers, tooling and gauge makers, and quality/inspection teams in the ophthalmic optics supply chain.

Q: Is it current or superseded?

A: ISO 11381:2016 is the second edition published in October 2016 and, after review, was confirmed (remained current) in the ISO maintenance cycle. It replaced ISO 11381:1994.

Q: Is it part of a series?

A: It is a focused ophthalmic optics standard and is cross-referenced with other ISO standards on threads, taps and gauges (for example ISO 1501, ISO 965‑3, ISO 529 and ISO 1502) rather than forming a numbered multi-part series itself.

Q: What are the key keywords?

A: Spectacle frames, screw threads, ophthalmic optics, miniature threads, metric threads, taps, gauges, thread tolerances, interchangeability.