Industrial & Scientific > Screws > Lag Screws

Hillman One-Way Lag Screws, 5/16-18 x 3in, 50 Pack, Black Phosphate

Product ID: B003VG39Z8 Condition: New

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$ 151

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Product Description

Hillman One-Way Lag Screws, 5/16-18 x 3in, 50 Pack, Black Phosphate

ONE-WAY LAG SCREWS FOR TAMPER-RESISTANT PERMANENT FASTENING: 5/16 in. x 3 in. heat-treated one-way lag screws are engineered for security gates, public restroom fixtures, institutional hardware, and installations requiring tamper resistance.
ONE-WAY SLOTTED HEAD ALLOWS INSTALLATION BUT RESISTS REMOVAL: Slotted head installs with a standard flat-head screwdriver but prevents easy removal once tightened. Extraction requires a specialized tool, ideal for permanent installations.
HEAT-TREATED GRADE 5 STEEL FOR HIGH-STRENGTH PERFORMANCE: Heat-treated Grade 5 steel withstands high torque and demanding installation conditions, preventing snapping or breaking during driving into wood and structural materials.
PRE-DRILLING RECOMMENDED FOR PROPER INSTALLATION: Drill a pilot hole matching the screw diameter before installation to reduce material stress, prevent wood splitting, and ensure smooth, accurate driving into structural wood materials.
TRUSTED HILLMAN FASTENING SOLUTIONS: Hillman hardware products are engineered for consistent quality, dependable performance, and reliable fastening across construction, repair, and home improvement project applications.

One-way lag screws, also known as security screws are commonly used in applications where either theft or vandalism is common or expected. Common applications include safes, security gates, public restroom fixtures and enclosures, and other scenarios requiring greater security. Heat-treated and made high quality, this screw meets strict standards having virtually no chance of shearing. This screw is designed with a slotted drive for simple installation with a standard slotted screwdriver. For greater security, the one-way lag screw requires an extraction tool for removal. Use this screw in a pre-drilled hole to prevent snapping.