Overview
These 18-8 stainless steel hex head cap bolts (also called hex cap screws or tap bolts) are fully threaded fasteners designed for high-corrosion environments. The 7/16-14 x 3″ size delivers reliable thread engagement from under the head to the point, making them ideal for applications requiring permanent threading or use with a nut. The Grade 18-8 (304 stainless steel) composition ensures excellent atmospheric corrosion resistance and longevity in industrial, marine, chemical processing, and outdoor settings.
Key Features
- Fully Threaded — Threading runs the complete length from under head to tip; also called tap bolts
- Grade 18-8 Stainless — High tensile strength of 70,000 PSI with superior corrosion resistance compared to carbon steel
- Hex Head Design — Six-sided bolt with trimmed hex head and washer face on bearing surface for secure wrench or socket grip
- ASME B18.2.1 Compliant — Stainless steel hex cap screws meet specific tolerances under ASME B18.2.1-1996
- Coarse Thread — 7/16-14 pitch for fast assembly and reliable load distribution
- Plain Finish — No additional coating; bright stainless appearance
Technical Specifications
Detailed specifications for the 7/16-14 x 3″ fully threaded hex head cap screw:
- Material: Grade 18-8 Stainless Steel (304)
- Head Style: Hex
- Thread Pitch: 14 TPI (Coarse)
- Diameter: 7/16″
- Length: 3″ (measured from under head)
- Thread Coverage: Fully Threaded (FT)
- Across Flats (Width): 5/8″ nominal
- Head Height: 9/32″ nominal
- Tensile Strength: 70,000 PSI minimum
- Finish: Plain (natural stainless)
- Standard: ASME B18.2.1
- Quantity: Approximately 10 per box
Typical Applications
These fasteners excel in demanding environments requiring corrosion resistance:
- Chemical processing equipment and piping
- Marine and offshore installations
- Food processing and pharmaceutical equipment
- Outdoor fixtures and infrastructure
- General mechanical assembly where stainless is specified
- Applications requiring nut-based assembly or tapped holes
Compatibility & Replacements
Compatible With
- 7/16″ standard wrench or socket (5/8″ across flats)
- 7/16-14 UNC threaded nuts (Grade 2, 5, or 8)
- 7/16-14 tapped holes and threaded inserts
- Any assembly requiring ASME B18.2.1–compliant hex cap screws
- Stainless steel washer packs (optional)
Replaces / Drop-In Replacement For
- Any ungraded or standard hex head cap bolt meeting ASME B18.2.1 in this size
- Equivalent 18-8 stainless hex cap screws from any compliant manufacturer
- Carbon steel bolts in non-corrosion-critical applications (upgrade)
Works With
- ASME B18.2.1 standard fastening systems
- SAE/ISO hex nut and washer assemblies
- Stainless steel fastener kits and assortments
- Industrial MRO (maintenance, repair, operations) fastening inventory
