: Specifies steel and brass machine screws with captive washers for general purposes, primarily in the electronics industry. Current Version JIS B 1188:2017 (revises the 1995 version). Key Feature : The head diameter is typically 5% to 20% smaller
"The radius under the head," Kenji muttered to himself, tracing the curve on the screen. "That's the bottleneck." jis b 1188 pdf
A concise guide to head diameters, heights, and driver sizes for various thread pitches is hosted by Metric & Multistandard Components. : Specifies steel and brass machine screws with