S-90198A221 Length 5/8" Tapping Screws

Tapping Screws

0428FA00021 Tapping Screws
0428FA00021 Tapping Screws

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

Part No.
Part No. 0428FA00021
Equivalent to mcmaster :
90198A221

Basic Information

Tapping Screw Type A/AB
System of Measurement Inch

Head Parameters

Head Type Flat
Head Diameter 0.312"
Head Height 0.1"
Flat Head Profile Standard

Dimensions

Length 5/8"
Shank Cross Section Round

Thread Parameters

Screw Size No. 8
Thread Diameter 0.164"
Approximate Threads per Inch 15
Thread Direction Right Hand
Threading Fully Threaded

Tip & Drive Parameters

Tip Type Pointed
Drive Style Phillips
Drive Size No. 2
Drill Bit Size No. 29
Drill Bit Diameter 0.136"
Countersink Angle 82°
Tapping Method Thread Forming

Material & Strength

Material 316 Stainless Steel

Temperature & Environment

For Use In Sheet Metal
REACH Compliant
RoHS Compliant

Installation & Application

Maximum Drilling Thickness 0.025"
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 with 316 Stainless Steel construction, ideal for harsh or outdoor environments.
  • Excellent holding power in sheet metal due to the thread forming (Type A/AB) design that creates strong, secure threads without chips.
  • Streamlined installation with a standard 82° countersink angle and a pointed tip for easy starting and a flush, professional finish.
  • Reliable, cam-out resistant driving provided by the Phillips No. 2 drive style for consistent torque application.
  • Full-length threading ensures maximum grip and load distribution along the entire shank in materials up to 0.025" thick.
  • Simplified procurement and assembly with clear specifications for a No. 29 drill bit, ensuring precise, pre-tapped holes.
  • Compliance with major environmental regulations (RoHS 3 & REACH), making them suitable for global supply chains and sensitive applications.

Professional Applications & Engineering Value

Engineered for demanding sheet metal applications, these thread forming tapping screws solve critical fastening challenges. The 316 Stainless Steel material offers exceptional resistance to corrosion from chemicals, saltwater, and industrial atmospheres, significantly extending service life in HVAC, marine, and food processing equipment. The flat head design with an 82° countersink sits flush to prevent snagging and improve safety. The thread forming action displaces material rather than cutting it, creating a tighter, more vibration-resistant fit that eliminates the need for a separate tapping operation and reduces assembly time and cost.

Specification Summary & Compliance

This No. 8 x 5/8" screw features a 0.164" thread diameter with approximately 15 threads per inch and is fully threaded. It conforms to the standard dimensional requirements for Type A/AB Tapping Screws. The product is manufactured to be fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free of restricted hazardous substances.

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