ASTM F290-94 (2020) PDF

Full title and description

Designation: F290‑94 (Reapproved 2020) — Standard Specification for Round Wire for Winding Electron Tube Grid Laterals. This specification defines material, dimensional, mechanical, surface, and spooling requirements for fine round wire used as electron tube grid lateral winding wire.

Abstract

This specification covers round wire (up to 0.006 in / 0.15 mm diameter) made from specified nickel alloys or molybdenum for use as electron tube grid lateral winding wire. Wires are classified into five classes by tensile properties and must meet defined tensile strength, yield, working range, and elongation requirements; surface and plating quality, continuous spooling, and referenced test methods are specified.

General information

• Status: Published (Reapproved 2020).
• Publication date: 30 April 2020 (effective date 01 May 2020).
• Publisher: ASTM International (Committee F01 — Electronics).
• ICS / categories: 29.060.10 — Wires.
• Edition / version: F290‑94 (Reapproved 2020).
• Number of pages: 6 pages.

Key bibliographic facts above are taken from the standard record and publisher metadata.

Scope

The standard applies to round winding wire up to 0.006 in. (0.15 mm) diameter intended for electron tube grid lateral winding. It establishes five classes of wire based on tensile and elongation properties, states units of measurement (inch‑pound primary, SI conversions informational), and notes the user's responsibility for applicable safety and regulatory practices.

Key topics and requirements

• Permitted materials: specified nickel alloys (examples include UNS N02211, UNS N10001, N03300) and molybdenum; composition requirements given in the standard.
• Dimensional limit: round wire up to 0.006 in (0.15 mm) diameter.
• Mechanical classes: five classes defined by tensile strength, yield, working range, and elongation ranges.
• Surface and plating quality: bare wire must be bright and free from cracks, slivers, lubricants, etc.; platings must be free from bubbles, flakes, blisters, porosity and plating salts.
• Handling and packaging: wire to be spooled in one continuous length and wound to allow unwinding without binding or distortion.
• Referenced test methods and related specs: cites related ASTM test methods and specifications (for example F16, F205, F288, F289 among others) for measurement and material references.

Typical use and users

Primary users are wire manufacturers, component and electron‑tube manufacturers, quality and test laboratories, and procurement/specification engineers who require tightly controlled fine wire for winding electron tube grid laterals and similar micro‑winding applications. The standard guides material selection, acceptance testing, and vendor/product specifications.

Related standards

This specification references and is used alongside several ASTM standards for measurement and related wire materials, including (but not limited to) ASTM F16 (diameter/thickness test methods), ASTM F205 (diameter of fine wire by weighing), ASTM F288 (tungsten wire), and ASTM F289 (molybdenum wire and rod) as normative or informative references.

Keywords

round wire; fine wire; electron tube; grid lateral; winding wire; nickel alloys; molybdenum; tensile properties; wire classification; spooling; ASTM F290.

FAQ

Q: What is this standard?

A: ASTM F290‑94 (Reapproved 2020) is a specification that defines material, dimensional, mechanical, surface, and packaging requirements for very fine round wire used as electron tube grid lateral winding wire.

Q: What does it cover?

A: It covers round wire up to 0.006 in (0.15 mm) diameter, classifies wire into five mechanical classes, specifies allowable materials (certain nickel alloys and molybdenum), surface/plating quality, spooling requirements, and references relevant test methods.

Q: Who typically uses it?

A: Wire manufacturers, electronic‑tube and component manufacturers, test laboratories, and procurement/specification engineers use this standard to specify and verify fine winding wire for grid laterals and similar applications.

Q: Is it current or superseded?

A: The document is recorded as F290‑94 with reapproval in 2020 (publication date 30 April 2020, effective 1 May 2020). Users seeking the absolute latest status should verify with ASTM International for any amendments or later revisions beyond the 2020 reapproval.

Q: Is it part of a series?

A: Yes — it is issued under ASTM Committee F01 (Electronics) and is part of a family of F‑series standards covering fine wire and materials for electronic devices (see related specs such as F288 and F289).

Q: What are the key keywords?

A: Round wire, fine wire, winding wire, electron tube grid lateral, nickel alloy wire, molybdenum wire, tensile classification, spooling, ASTM F290.