S-90288A112 4-40 x 3/4" Tamper-Resistant One-Way-Drive Stainless Steel Round Head Screws
Tamper-Resistant One-Way-Drive Stainless Steel Round Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior corrosion resistance from 18-8 stainless steel and passivated finish for extended service life in harsh environments
- High tensile strength of 80,000 psi ensures reliable fastening under demanding mechanical loads
- Precision Class 2A thread fit provides consistent engagement and reduces cross-threading risks
- Full threading along the 3/4" length offers maximum grip and adjustment flexibility
- Rockwell B96 hardness rating maintains thread integrity and resistance to deformation
- One-way drive style with rounded head enables secure installation while preventing tampering
- Compliance with RoHS 3 and REACH regulations ensures environmental safety for global industrial applications
Professional Applications & Engineering Value
These 4-40 UNC rounded head screws deliver critical performance advantages for industrial assembly where corrosion resistance and mechanical reliability are paramount. The combination of 18-8 stainless steel construction and passivated finish creates a protective barrier against chemical exposure and atmospheric corrosion, significantly extending service intervals in manufacturing equipment, electronic enclosures, and marine components. The coarse thread spacing and Class 2A thread fit ensure rapid installation with reduced galling, while the fully threaded design provides uniform clamping force across the entire 3/4" length. The one-way drive style adds security in public-access installations, making these fasteners ideal for maintenance-sensitive applications requiring both durability and tamper resistance.
Specification Summary & Compliance
Manufactured to inch system standards with 4-40 UNC coarse threads and Class 2A thread fit for precision tolerance. The screws feature a rounded head profile with 0.211" diameter and 0.086" height, right-hand thread direction, and fully threaded construction. Mechanical properties include 80,000 psi tensile strength and Rockwell B96 hardness. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial use.
