1188 Pdf !!link!!: Jis B
JIS B 1188 standard specifies the requirements for cross-recessed head machine screws with captive washers
However, there are also limitations to consider. SEMS screws typically have a longer incomplete thread portion (the distance from the bearing surface to the full thread) than standard screws. This makes them less suitable for securing very thin sheets of material if not specifically designed for such applications.
, stainless steel (A2), or brass. Standard finishes include clear or yellow zinc plating. ITP | Industrial Threaded Products Standard Variations (Types)
: The presence of the captive washer results in a longer unthreaded portion ('a' dimension), making standard SEMS screws unsuitable for securing very thin plates . jis b 1188 pdf
Found in home appliances, computers, and game consoles due to the small footprint and rapid automated assembly capability.
Offers a flat bearing surface with a rounded top edge, providing an aesthetic finish and high clamping distribution.
For M6 cross recessed pan head screws with captive washer assemblies, recommended tightening torques typically range between , depending on the specific application and washer configuration. Always consult the full standard and application engineering guidelines for precise torque specifications. JIS B 1188 standard specifies the requirements for
For full, official technical tables, dimensional drawings, and material specifications, you should refer to the official standard documentation.
: Often a more cost-effective alternative to patented conical washer designs.
: Eliminates manual washer assembly on factory floors. , stainless steel (A2), or brass
Typically M2 to M12, with M3, M4, M5, and M6 being most common Clear Zinc, Yellow Zinc, Black Zinc, and Nickel Plating Key Components & Variations
Precise measurements for the head diameter, head height, thread diameter, and overall length.
Intertek Inform : Useful for viewing the detailed to see exactly which sections (like "Inspection of fitting condition") are included. JIS B 1188:2017 - Accuris Standards Store
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Each screw must bear: