Master Lock 1630 vs. 1631: Right- vs. Left-Hinged Lift-Handle Locker Locks

Short answer: the Master Lock 1630 is the right-hinged model and the Master Lock 1631 is the left-hinged model for the manufacturer’s standard lift-handle locker application. Their operating concept is otherwise closely related, but handing is a functional fit requirement, not a cosmetic choice. Master Lock currently identifies the 1631 as discontinued, so a left-hinged replacement project needs an especially careful review of the existing lock, locker preparation, and current supported options.

Key Takeaways

• Use the 1630 family for the specified right-hinged lift-handle application and the 1631 family for the specified left-hinged application.
• Both base models are built-in combination locks with automatic locking and five manufacturer-provided preset combinations.
• Master Lock’s current 1630 page does not carry a discontinued notice; its current 1631 and 1631MD pages label those models discontinued.
• The MD suffix identifies a metal-dial version, not a different hinge side or locker mechanism.
• Do not reverse, rotate, or substitute a lock simply because the front dial and body look similar.
• Confirm the full model, hinge side, handle linkage, mounting preparation, and door condition before requesting a replacement.

Master Lock 1630 vs. 1631 Comparison

This comparison is a starting point, not a compatibility approval. The locker manufacturer’s preparation, linkage, door thickness, mounting locations, and current documentation must agree with the selected model.

Hinge Side Is the Deciding Difference

When comparing Master Lock 1630 vs. 1631, begin with the complete locker door rather than the lock face. Master Lock associates the 1630 with hinges on the right and the 1631 with hinges on the left. The internal case and interface are arranged for that application. A dial that appears similar from the aisle does not make the two locks reversible.

Record the hinge location while facing the closed locker, and include a full-door photograph so the orientation is unambiguous. Also photograph the back of the door, lift handle, lock case, connecting hardware, and frame-side components. If an old label is readable, capture the entire model designation, including its suffix.

What the 1630 and 1631 Share

Both models are built-in combination locks for standard lift-handle lockers. Master Lock describes automatic locking, five preset combinations, a three-digit dialing sequence, and a 1-7/8-inch body width for each. Those common specifications explain why the units may look related, but they do not override the right-versus-left application.

A school using these locks also needs an authorized combination-record and control process. The preset combinations are manufacturer provided, while authorized school staff manage which preset is active and protect the related records; this is not a user-programmable padlock. Keep combination charts and control information restricted to authorized personnel, and avoid including sensitive credentials in an ordinary product inquiry.

How Current Model Status Affects a Left-Hinged Project

The current School Lock Supply 1630 page and 1630MD page help identify the right-hinged family. For the left-hinged family, the catalog also has a 1631 reference page and 1631MD reference page. A catalog page should not be read as a promise of availability.

More importantly, Master Lock’s current official 1631 and 1631MD product pages say those models are discontinued. That fact should be surfaced at the beginning of a left-hinged replacement review, not after a model has been assumed. It does not establish which alternative, if any, will fit a particular legacy locker. Ask for current manufacturer-supported guidance using the locker details and photographs; do not infer a successor solely from appearance or numbering.

Base Models and MD Variants

The 1630 and 1631 base designations identify the application and hinge side. The corresponding 1630MD and 1631MD designations identify metal-dial variants within those families. A dial-material preference does not change right handing to left handing, alter the lift-handle interface, or make an otherwise unsuitable installation compatible.

For a mixed locker bank, record the exact designation on every installed unit. Do not consolidate base and MD rows until the project team has decided whether the distinction matters to its approved specification and has verified a current product path.

Keep Product Status Separate From Physical Compatibility

A discontinued label answers an important product-status question, but it does not identify a replacement. Legacy locker banks may still contain 1631 or 1631MD locks, and documenting them accurately helps a manufacturer or product specialist understand the original left-hinged application. Keep the original model in the survey even when the proposed solution will need a different current designation.

Conversely, a product page without a discontinued notice does not prove current supply or fit for every right-hinged lift-handle locker. The 1630 still has to match the preparation and linkage of the opening under review. Treat manufacturer status, physical compatibility, and the school’s operating specification as three separate checks. This prevents a current model from being chosen for the wrong mechanism and prevents a legacy model number from being mistaken for a confirmed ordering path.

Replacement Survey Checklist

• Full existing lock model and suffix, without publishing combination or control data.
• Locker manufacturer, series, and any door or frame labels.
• Hinge side, documented with a full closed-door photograph.
• Front and rear views of the lock, lift handle, linkage, and mounting points.
• Door thickness and relevant preparation measurements taken with a ruler in view.
• Door, handle, latch, and frame condition, including bent or missing components.
• Quantity separated by confirmed 1630-type, legacy 1631-type, and uncertain openings.

Use the replacement school locker lock identification guide when the model or mechanism is uncertain. If the question is automatic versus manual locking on a right-hinged lift-handle application, read the separate Master Lock 1630 vs. 1670 guide. The broader built-in combination lock category can help organize confirmed product families.

Frequently Asked Questions

What is the main difference between Master Lock 1630 and 1631?

The manufacturer specifies the 1630 for right-hinged lift-handle locker doors and the 1631 for left-hinged doors. That handing difference affects fit and operation.

Is the Master Lock 1631 discontinued?

Yes. Master Lock’s current official product pages label both the 1631 and 1631MD discontinued. Confirm current supported options for a specific left-hinged locker rather than assuming a direct substitute.

Can a 1630 be turned around for a left-hinged locker?

Do not assume it can. The models are application specific; verify the lock case, mounting, linkage, door preparation, and manufacturer guidance.

What do 1630MD and 1631MD mean?

MD identifies the metal-dial version within the corresponding model family. It does not change the model’s hinge side or lift-handle application.

Do both models lock automatically?

Master Lock’s product descriptions identify automatic locking for both the 1630 and 1631. Follow the current instructions for the exact approved configuration.

Are their five preset combinations user changeable?

They are manufacturer-provided preset combinations, not an ordinary user-settable code feature. Authorized school staff should manage the related records and procedures.

What should a school send for a fit review?

Send the non-sensitive full model, locker identity, hinge side, clear front and rear photos, lift-handle and linkage views, measurements, condition notes, and quantity by configuration.

Product References

• Master Lock 1630 product specifications
• Master Lock 1631 product specifications and discontinued status
• Master Lock 1631MD product specifications and discontinued status
• Master Lock locker lock catalog
• Master Lock locker installation and maintenance resources

Get Help Identifying a 1630 or 1631 Application

For a right-hinged project or a legacy left-hinged replacement question, ask School Lock Supply for product-selection or quote help. Share the verified, non-sensitive locker details so the application can be reviewed before a model is specified.

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