Electronic vs mechanical safe locks: which belongs on your gun safe?

The differences at a glance

Two safe dealers publish side-by-side lock comparisons, Safe and Vault Store (mechanical vs electronic vs biometric) and Dean Safe (lock logic). Where they give figures, we quote them and say whose they are. Lock makers' own documents fill in the rest.

The pattern is consistent across sources: the dial trades speed for independence from batteries and a very long service life, while the keypad trades a battery and a finite lifespan for speed and convenience.

Lock ratings: UL 768 groups and electronic Type 1

Mechanical combination locks are rated under UL 768, which UL says tests "the ability of combination locks to resist unauthorized opening of the combination locks by sense of sight, touch, or hearing." The same scope is explicit that "these requirements do not cover electronic locks" (UL 768). Safe and Vault Store summarizes the groups this way:

• Group 2: "The standard rating found on most consumer safes. Based on minimum construction standards and dialing tolerances only."
• Group 2M: "Adds 2 man-hours of expert manipulation resistance on top of the Group 2 baseline."
• Group 1: "Rated to resist 20 man-hours of expert manipulation."
• Group 1R: "All the features of Group 1 plus an additional 20 hours of resistance to radiological attacks."

A common example: Sargent & Greenleaf's 6730 dial lock lists UL Group 2 certification, a "key changeable wheel design for simple combination changing" and a "familiar left-right-left dialing sequence" ( S&G 6730 spec sheet). Makers of the gun safes on this page say "UL-listed" or "UL-rated" dial without naming the group, so ask if the group matters to you.

Electronic safe locks have their own UL standard, UL 2058, titled "High-Security Electronic Locks" (UL 2058). Safe and Vault Store calls a UL Type 1 electronic lock "the high-security designation for digital locks" and adds that "UL will not certify a Type 1 lock with a key override". Consistent with that, the Stealth UL28 pairs a UL-listed electronic lock with external battery access and lists no override key.

One rule covers both types: a listed lock is not a listed safe. Liberty's Centurion uses a UL-listed electronic lock, but Liberty cites no UL listing for the safe body. The burglary listing that matters for the whole safe is the one our UL RSC rating explainer covers.

Reliability, and what to do when a keypad goes dead

A dial has no electronics to fail, which is why dealers credit it with such a long life, though Safe and Vault Store still recommends periodic servicing. An electronic lock's weak points are its power and its keypad. Sargent & Greenleaf's troubleshooting guide for its older 6120 and 6123 keypad locks lists the usual causes when a lock won't open: a wrong code, the # key not pressed, batteries that need replacing, the lock sitting in security lockout, a defective keypad or a broken wire (S&G troubleshooting guide). The same guide calls for fresh nine-volt alkaline batteries and warns that "Extra Heavy Duty" batteries are not alkaline and will not work.

Batteries are a schedule, not an emergency. GunVault suggests changing the MV500's batteries at least every six months, and Dean Safe recommends a "brand new, name brand 9 Volt Alkaline battery with an expiration date at least 4 years in the future" for 9V locks. Liberty notes that on its S&G locks the batteries sit in the keypad outside the safe, so they can be replaced with the door locked (Liberty).

Speed, codes and children

For a bedside pistol box, speed and simplicity dominate, and both lock types show up. The Fort Knox Original Pistol Box uses a Simplex mechanical push-button lock with "over 1,000 possible combinations" and no batteries; V-Line's Desk Mate lists 1,081. The GunVault MV500 uses a keypad with a 3- to 6-digit code and a backup key. For comparison, S&G lists "1 million possible combinations" for its 3-wheel 6630 dial (S&G 6600 series).

With children in the house, the lock type matters less than the habits around it. Keep codes and keys out of reach, choose a code no one in the house could guess, and change it if you think it has been seen. Electronic locks make that last step easy; a dial usually means a service call. For bedside boxes that add fingerprint or RFID entry, see biometric vs keypad vs RFID gun safes and are biometric gun safes reliable?

The safes side by side

Four gun safes, two with each lock type as standard. Every cell links to its source; a dash means the figure isn't published in the sources we checked.

And the two pistol boxes, one mechanical and one electronic:

The gun safes and the pistol boxes are scored on different published rubrics, so compare scores within each table, not across them. On the gun-safe rubric, lock and entry is 15% of the score, below the independent burglary listing (30%) and construction and fire evidence (20% each); the lock is rarely the reason to choose one safe over another, but it is the part you touch every day.

Two practical consequences of this choice have their own pages: what to do when an electronic lock has a flat battery, in how to open a gun safe with a dead battery, and what a manufacturer may hold on record about an electronic combination, in do safes have master codes.

Which lock for which owner

• Long-term storage opened rarely, no appetite for batteries: a mechanical dial. Plan on the periodic service dealers recommend.
• Opened often, or by more than one adult: an electronic keypad, with a battery change on your calendar and the backup entry checked before you need it.
• Can't decide: buy a safe that offers both at order. The Liberty Lincoln 25 offers three lock choices, the Stealth UL28 a dial upgrade, the AMSEC BFX6030 an electronic option, and the AMSEC RF6528 five choices.
• A bedside pistol box: a Simplex lock if you never want a dead battery, a keypad with a backup key if you want more possible codes. Our no-battery pistol safe picks cover the mechanical side.

Whatever the lock, it sits on a safe, and the safe's own listing does most of the protecting. If you are still choosing the safe itself, start with how to choose a gun safe.