Master Lock Co 1UPLJ Universal Pin Padlock

Product Description

The MASTER LOCK CO 1UPLJ is a universal pin padlock designed for applications that require field rekeying without replacing the entire lock body. The padlock features a 1.75-inch wide body and a 2.5-inch long shackle with a 0.3125-inch diameter, offering a range of clearance for hasps, chains, and similar hardware. No keys are included at the point of sale, as this lock is intended to be keyed on-site using the hand-held keying tool model 376. Locksmiths, facility maintenance techs, and security contractors are the typical installers for this product type.

This padlock is suited for commercial and industrial use cases where multiple locks must be keyed alike or keyed to an existing master system without sending hardware out for rekeying. The universal pin design allows the lock to accept a range of key cuts once configured. Compatible key blanks include the Master Lock K1BOX or the Ilco blank M1. The rekeying process is performed using the hand-held keying tool 376 along with rekeying kit TV 575-563, both sold separately.

Key Features

• Field-rekeyable universal pin cylinder — no locksmith bench required
• 2.5-inch shackle length provides clearance for standard hasps and chain links
• Shackle diameter of 0.3125 inches for compatibility with common hasp slots
• Compatible with Master Lock key blank K1BOX or Ilco blank M1
• Rekeyed using hand-held keying tool 376 and kit TV 575-563 (sold separately)
• No keys included — ready for on-site keying upon installation

Compatibility

Accepts Master Lock key blank K1BOX or Ilco blank M1. Rekeying requires hand-held keying tool 376 and rekeying kit TV 575-563. No other specific system or model compatibility is stated in available product data.

Installation Notes

Installation is performed by locksmiths, facility maintenance professionals, or security contractors familiar with pin tumbler lock systems. Before rekeying, ensure the lock is in the open position and use only the designated keying tool to avoid damaging the pin chambers. Do not force the shackle closed on an oversized hasp opening, as this can stress the shackle and reduce security integrity. Follow all applicable facility security codes and manufacturer keying instructions.

Technical Specifications

• Body Width: 1.75 inches
• Shackle Length: 2.5 inches
• Shackle Diameter: 0.3125 inches
• Weight: 3.87 pounds
• Keys Included: None
• Unit of Measure: EA
• Package Quantity: 6

Standard Information

• Brand: MASTER LOCK CO
• Manufacturer Part Number: 1UPLJ