S-91223A335 1/4"-20 x 7/8" 316 Stainless Steel Ultra-Low-Profile Socket Head Screws

316 Stainless Steel Ultra-Low-Profile Socket Head Screws

0031FA00048 316 Stainless Steel Ultra-Low-Profile Socket Head Screws
0031FA00048 316 Stainless Steel Ultra-Low-Profile Socket Head Screws

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

Part No.
Part No. 0031FA00048
Equivalent to mcmaster :
91223A335

Basic Information

System of Measurement Inch

Head Parameters

Head Type Socket
Head Diameter 1/2"
Head Diameter Tolerance -0.005" to 0.005"
Head Height 5/64"
Socket Head Profile Ultra-Low

Dimensions

Length 7/8"
Shoulder Diameter 5/16"
Shoulder Length 5/64"

Thread Parameters

Thread Type UNC
Thread Size 1/4"-20
Thread Diameter 0.25"
Thread Spacing Coarse
Thread Direction Right Hand
Thread Fit Class 2A
Threading Fully Threaded

Tip & Drive Parameters

Drive Style Hex
Drive Size 1/8"

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 due to 316 stainless steel construction, ideal for chemical and marine applications.
  • Exceptional mechanical strength with 70,000 PSI tensile strength and Rockwell B70 hardness for reliable performance under high stress.
  • Space-saving ultra-low socket head profile allows for installation in tight or recessed spaces without compromising drive engagement.
  • Precise and reliable thread engagement with Class 2A thread fit, ensuring consistent assembly and reducing the risk of cross-threading.
  • Broad regulatory compliance with RoHS 3 and REACH standards, making it suitable for global industrial and electronic applications.
  • Easy installation and removal using a standard 1/8" hex key, providing secure torque transmission and reducing tool slip.
  • Versatile coarse UNC thread design offers quick assembly and high resistance to vibration loosening in demanding conditions.

Professional Applications & Engineering Value

This 316 stainless steel ultra-low socket head cap screw is engineered to address critical challenges in industries where corrosion resistance and mechanical durability are paramount. The ultra-low socket head profile minimizes protrusion, making it ideal for compact machinery, precision instruments, and enclosed systems where space constraints exist. With a coarse UNC 1/4-20 thread and Class 2A fit, it ensures rapid, secure fastening in high-vibration environments like automotive assemblies, marine equipment, and chemical processing plants. The fully threaded design provides uniform clamping force, while the 70,000 PSI tensile strength and Rockwell B70 hardness prevent failure under dynamic loads, offering long-term reliability and reduced maintenance costs.

Specification Summary & Compliance

This screw adheres to inch system dimensions with precise Class 2A thread fit for consistent performance. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances. Manufactured to standard specifications for UNC coarse threads and ultra-low socket head profile, it guarantees dimensional accuracy and reliability in industrial applications.

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