Minerallac Company 21016SLTPJ - A tamperproof machine screw with a round head and one-way slot drive. It is made of 18-8 stainless steel. The screw size is 1/4" with a length of 1" and a thread size of 20 TPI.
Minerallac Company

21016SLTPJ

UPC: 085937083951


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Minimum Qty: 100

Multiplier: 100

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Overview

Minerallac 21016SLTPJ is a tamperproof machine screw designed for secure fastening in industrial applications where unauthorized removal must be prevented. This 1/4"-20 stainless steel screw features a round head with a one-way slotted drive, ensuring it can only be installed—not removed—with standard tools. Constructed from 18-8 stainless steel, it delivers superior corrosion resistance and strength, making it ideal for harsh environments including electrical enclosures, control panels, and machinery assemblies. Key specifications include a 1" length, 20 threads per inch (TPI), and a round head profile optimized for flush mounting. The one-way slot drive design prevents tampering or theft, a critical feature for security-sensitive installations. This screw meets industrial standards for stainless steel fasteners, providing reliable performance in both indoor and outdoor settings. Common applications include securing electrical panels, junction boxes, and equipment housings where tamper resistance is required. The 18-8 stainless steel composition ensures compatibility with NEMA-rated enclosures and other stainless-steel hardware, reducing the risk of galvanic corrosion. Available in bulk packaging (100 per jar/box), this screw is a cost-effective solution for OEMs, contractors, and maintenance teams requiring secure, long-lasting fasteners. Unlike standard Phillips or slotted screws, the one-way slot drive eliminates the possibility of removal by unauthorized personnel, enhancing security without sacrificing installation ease. The round head design provides a clean, professional appearance while maintaining sufficient bearing surface for proper torque application. This screw is not intended for high-stress structural applications but excels in securing panels, covers, and lightweight machinery components. For applications requiring tamperproof fastening in corrosive or high-moisture environments, Minerallac 21016SLTPJ offers a reliable, code-compliant solution. Pair with compatible stainless steel nuts and washers for optimal performance in NEMA 4X or similar enclosures.
  • Tamperproof one-way slotted drive prevents unauthorized removal
  • 18-8 stainless steel construction resists corrosion and rust
  • 1/4"-20 x 1" dimensions with 20 TPI thread pitch
  • Round head design for flush mounting in panels and enclosures
  • Bulk packaging (100 per jar/box) for industrial use

Specifications

Drive Type
One-Way Slot
Head Type
Round Head
Length
1 in
Length
25.4 mm
Material Quality
18-8 Stainless Steel
Size
1/4"
Thread Size
20 TPI
Type
Tamperproof Machine Screw
Package Dimensions (L x W x H)
3 IN x 3 IN x 2.25 IN
Package Dimensions (L x W x H)
7.62 cm x 7.62 cm x 5.715 cm
Package Weight (Imperial)
1.1500 L
Package Weight (Metric)
0.5220 kg
A tamperproof machine screw with a flat head and socket pin drive. It is made of 18-8 stainless steel with a stainless finish for general atmospheric corrosion resistance. The screw size is 1/4-20 x 1-1/4 in, with a length of 1.250 in and 2A external threads at 20 TPI.

21020SP

A tamperproof machine screw with a flat head and socket pin drive. It is made of 18-8 stainless steel with a stainless finish for general atmospheric corrosion resistance. The screw size is 1/4-20 x 1-1/4 in, with a length of 1.250 in and 2A external threads at 20 TPI.
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Frequently Asked Questions about Minerallac Company

What are the main product lines offered by Minerallac Company?

Minerallac Company offers multiple comprehensive product lines including Minerallac Traditional (electrical fasteners), Strut Fittings, Stainless Steel Fasteners, Black Claw, Impact Staples, and Redmore. Their Traditional line features over a thousand electrical fastener variations covering conduit/cable/wire products, nail straps, beam clamps, metal stud & drywall accessories, acoustical supports, voice/data hardware, and miscellaneous electrical installation components.

What is Minerallac Company's warranty policy?

Minerallac Company provides a limited warranty that guarantees all products are free from defects in material and workmanship. If a product fails to meet this warranty, Minerallac's sole liability is to replace the product at no charge. The warranty is exclusive and does not cover consequential damages, lost profits, or implied warranties of merchantability or fitness for a particular purpose.

What industries and applications are Minerallac Company products used for?

Minerallac Company products are used extensively across electrical, construction, and industrial applications, including conduit and cable support, beam mounting, metal stud and drywall installation, voice/data infrastructure, and low voltage systems. Their product lines cover critical fastening solutions for electrical contractors, with specialized offerings in conduit hangers, straps, beam clamps, cable supports, and mounting hardware for various industrial environments.

What technical support does Minerallac Company offer?

Minerallac Company offers comprehensive technical support through multiple channels, including a toll-free customer service line at 800-927-3293, email support at [email protected], and online resources at www.minerallac.com. Their support covers product selection, technical specifications, and customer service for their extensive line of electrical fasteners, hangers, straps, and hardware across multiple product brands including Minerallac Traditional, Cully, Black Claw, IMPACT Staples, and Minerallac Stainless Steel. Support hours are 8:00 A.M. to 5:00 P.M. CT for their corporate office and 8:00 A.M. to 5:00 P.M. PT for their regional office.

What are the key features of Minerallac Company products?

Minerallac Company products feature a comprehensive range of electrical fasteners and hardware with exceptional versatility, including over 1,000 different sizes, styles, and finishes. Key features include multiple product lines such as Traditional, Strut Fittings, and Stainless Steel options with specialized finishes like 304/316 Stainless Steel, Hot-Dipped Galvanized, and Zinc Electroplate. Their products are engineered for electrical contractors, offering time-saving solutions with high-quality fasteners designed for durability, corrosion resistance, and worker safety across various installation environments.

What environmental ratings do Minerallac Company products have?

Minerallac Company products have robust environmental ratings, including UL 508A Type 1, 2, 3, 4, 4X, 12, and 13 certifications, CSA Type 1-4X, 12, and 13 ratings, and IEC 60529 IP66 protection. The products are WEEE and RoHS compliant, with UV and oil resistance, and can operate in extreme temperatures ranging from -55°C to 105°C, making them suitable for harsh industrial environments.

What accessories are available for Minerallac Company products?

Minerallac Company offers a comprehensive range of accessories across multiple product categories, including hardware, fasteners, and mounting solutions. Key accessories include stove bolts with nuts, wing nut washers, bar joist washers, stud clip adapters, brackets, perforated strapping, cable support options like J-hooks and bridle rings, box mounting brackets, outlet retainers, and various stud and drywall supports. Their accessories are available in multiple finishes such as stainless steel, hot-dipped galvanized, zinc electroplate, and powder-coated options.

How are Minerallac Company products typically installed?

Minerallac Company products are typically installed using a variety of specialized fastening solutions, including conduit hangers, straps, beam clamps, and mounting brackets designed for different electrical and construction applications. Installation methods vary by product type, with options for metal studs, drywall, beams, acoustical surfaces, and low voltage systems. The company offers multiple installation styles such as one-hole and two-hole straps, universal beam clamps, and specific mounting hardware to ensure secure and efficient attachment across diverse electrical and construction environments.

What communication protocols do Minerallac Company products support?

Minerallac Company's Brad product line supports multiple industrial communication protocols, including Ethernet, DeviceNet, PROFIBUS, Modbus, CANopen, Serial, AS-interface, and CC-Link. Their comprehensive portfolio covers over 40 industrial protocols, providing flexible communication solutions for various industrial automation applications from PC-based control to PLC systems.