S-91223A421 M4 x 12 mm 316 Stainless Steel Ultra-Low-Profile Socket Head Screws

316 Stainless Steel Ultra-Low-Profile Socket Head Screws

0031FA00070 316 Stainless Steel Ultra-Low-Profile Socket Head Screws
0031FA00070 316 Stainless Steel Ultra-Low-Profile Socket Head Screws

Image may differ from product. See technical specification for details.

Part No.
Part No. 0031FA00070
Equivalent to mcmaster :
91223A421

Basic Information

System of Measurement Metric

Head Parameters

Head Type Socket
Head Diameter 7 mm
Head Diameter Tolerance -0.127mm to 0.127mm
Head Height 1.3 mm
Socket Head Profile Ultra-Low

Dimensions

Length 12 mm
Shoulder Diameter 4.5 mm
Shoulder Length 1.3 mm

Thread Parameters

Thread Type Metric
Thread Size M4
Thread Pitch 0.7 mm
Thread Spacing Coarse
Thread Direction Right Hand
Thread Fit Class 6g
Threading Fully Threaded

Tip & Drive Parameters

Drive Style Hex
Drive Size 2.5 mm

Material & Strength

Material 316 Stainless Steel
Hardness Rockwell B70
Tensile Strength 70000 psi

Temperature & Environment

REACH Compliant
RoHS Compliant
Technical Drawings No drawings available at the moment, will be launched soon
In Stock
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Key Features & Benefits at a Glance

  • Superior corrosion resistance in harsh environments thanks to 316 stainless steel construction
  • High-strength performance with 70,000 psi tensile strength and Rockwell B70 hardness for reliable, long-lasting assemblies
  • Space-saving design with an ultra-low profile head ideal for applications with limited clearance
  • Precise, secure fastening ensured by the Class 6g thread fit and coarse thread pitch for easy installation and vibration resistance
  • Efficient installation and removal with a standard 2.5 mm hex drive for high torque application
  • Maximum thread engagement from the fully threaded design for a stronger hold across the entire length
  • Compliance with strict environmental regulations including RoHS 3 and REACH for use in regulated industries

Professional Applications & Engineering Value

This M4 socket head cap screw is engineered to solve critical challenges in precision assemblies. The 316 Stainless Steel material provides exceptional resistance to chemicals and saltwater corrosion, making it ideal for marine, chemical processing, and food industry applications where durability is non-negotiable. The ultra-low profile head allows for installation in tight spaces without compromising on strength, while the Class 6g metric thread ensures a precise fit that reduces the risk of cross-threading and loosening under vibration. With a coarse thread pitch of 0.7mm, these screws offer faster installation and superior performance in brittle materials or where frequent disassembly is required, delivering reliable engineering value in demanding industrial fastening scenarios.

Specification Summary & Compliance

This precision socket head cap screw conforms to Metric standards with an M4 x 0.7mm coarse thread and a Class 6g thread fit tolerance, ensuring high dimensional accuracy. The manufacturing and material specifications support a tensile strength of 70,000 psi. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to international environmental and safety standards for hazardous substances.

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