Master Lock Co 312DLH Laminated Padlock Long Shackle

Product Description

The MASTER LOCK CO 312DLH is a laminated steel padlock built for outdoor and industrial applications where weather exposure is a constant concern. The lock ships with a blue weatherproof cover that shields the body from rain, moisture, and temperature extremes. The shackle is hardened steel, measuring 2 inches in length and 3/8 inches in diameter, providing a longer reach than a standard shackle for use on larger hasps, chains, and gate hardware. Licensed HVAC, plumbing, and electrical contractors frequently use locks of this type to secure outdoor equipment enclosures, gas meter access panels, and electrical disconnects.

This padlock is suited for exterior installations where weather protection is required without sacrificing lock integrity. The laminated steel body construction resists corrosion and impact, making it appropriate for both residential and light commercial service environments. The long shackle design accommodates thicker hasp hardware and chain links common in mechanical equipment rooms and rooftop unit enclosures. It is sold in a package quantity of 4 units per carton, making it practical for fleet service trucks and service contracts requiring multiple secured locations.

Key Features

• Blue weatherproof cover protects lock body from rain, moisture, and extreme temperatures
• Hardened steel shackle at 2 inches length for extended reach on large hasps and chains
• 3/8 inches shackle diameter for compatibility with standard chain and hasp hardware
• Laminated steel body construction for impact and corrosion resistance
• Keyed to Master Lock Key Blank K1BOX or Ilco Blank M1 TV 320-952 for easy rekeying sourcing
• Sold 4 units per carton for multi-location service applications

Compatibility

Keyed to Master Lock Key Blank K1BOX or Ilco Blank M1 TV 320-952. Designed as a direct-use laminated padlock for standard hasp, chain, and gate hardware with 3/8 inches shackle clearance requirements.

Installation Notes

Installation requires no special tools beyond confirming hasp or chain slot clearance matches the 3/8 inches shackle diameter. Before securing electrical disconnects or gas meter enclosures, verify that all power is off and gas is shut off per local code requirements. Ensure the weatherproof cover is fully seated after each use to maintain protection against moisture intrusion. Refer to applicable NEC or local mechanical codes when using padlocks to secure lockout-tagout points on energized equipment.

Technical Specifications

• Shackle Length: 2 inches
• Shackle Diameter: 3/8 inches
• Body Width: 1.5 inches
• Shackle Material: Hardened Steel
• Cover Color: Blue
• Package Quantity: 4 units per carton
• Weight: 2.35 pounds
• Compatible Key Blanks: Master Lock K1BOX, Ilco M1 TV 320-952

Standard Information

• Brand: MASTER LOCK CO
• Manufacturer Part Number: 312DLH