Mosler Mechanical Dial Locks

Opening instructions and professional combination change service for Mosler mechanical dial safe locks throughout Brevard County, FL.

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Mosler Safe Company

A legacy of vault and safe security since 1874 — now part of the Diebold family

How to Open a Mosler Dial Lock

Mosler mechanical combination locks use the same industry-standard dialing procedure as S&G and LaGard dials.

Standard 3-Number Dialing Procedure

⚠️ Before You Start

Turn the dial slowly and smoothly — Mosler dials can be more sensitive than modern locks
If you go past a number, do NOT back up — start over from the beginning
Don't force the handle — if it doesn't open, re-dial
Vintage Mosler dials typically have numbers 0–99

Direction Reference

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LEFT (CCW)

Counter-clockwise

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RIGHT (CW)

Clockwise

3-Number Combination (4-3-2-1)

Example Combination: 30 - 60 - 90

1st30

2nd60

3rd90

Clear the lock: Turn the dial LEFT (CCW) at least 4 full turns to clear the lock
First number: Continue turning LEFT and stop on the 1st number (30) on the 4th time you reach it
Second number: Turn the dial RIGHT (CW), passing the 2nd number twice, then stop on it the 3rd time (60)
Third number: Turn the dial LEFT (CCW), passing the 3rd number once, then stop on it the 2nd time (90)
Open: Turn RIGHT slowly until the bolt retracts, then turn the handle to open the safe

✅ Quick Memory Aid (4-3-2-1)

Left 4× to 1st • Right 3× to 2nd • Left 2× to 3rd • Right 1× to open

💡 Be Precise

If you go past a number, do NOT back up. Start over from the beginning with 4 full left turns. Backing up will misalign the wheels.

4-Number Combination (5-4-3-2-1) — 4-Wheel Locks

Some older Mosler high-security safes use a 4-wheel pack with a 4-number combination:

Example Combination: 30 - 60 - 90 - 15

1st30

2nd60

3rd90

4th15

Clear the lock: Turn the dial LEFT (CCW) at least 5 full turns to clear all 4 wheels
First number: Continue turning LEFT and stop on the 1st number (30) on the 5th time you reach it
Second number: Turn the dial RIGHT (CW), passing the 2nd number three times, then stop on it the 4th time (60)
Third number: Turn the dial LEFT (CCW), passing the 3rd number twice, then stop on it the 3rd time (90)
Fourth number: Turn the dial RIGHT (CW), passing the 4th number once, then stop on it the 2nd time (15)
Open: Turn LEFT slowly until the bolt retracts, then turn the handle to open the safe

💡 How Do I Know If I Have a 4-Wheel Lock?

If your combination has 4 numbers instead of 3, you have a 4-wheel lock. These are typically found on Mosler GSA-rated containers and high-security vault locks.

Mosler Lock Models

Mosler Group 2 Locks Standard Security

20-minute manipulation resistance • Commercial grade

Found on many vintage and mid-century Mosler safes, vault doors, and security containers:

302 Series — Standard combination lock, widely used on Mosler fire safes
402 Series — Heavy-duty commercial lock for vault applications
Mosler-Sargent — Later production locks after Mosler partnered with S&G mechanisms

Mosler High-Security Locks High Security

UL Listed • Government spec • Manipulation resistant

Used on GSA-rated containers, bank vaults, and high-security applications:

Mosler 1-3 — Early Group 1 lock for government containers
GSA-rated locks — Found on Class 5 and Class 6 Mosler security containers

Changing the Combination

⚠️ Professional Service Required

Mosler mechanical locks require a specific change key for each lock model
Vintage Mosler change keys may be difficult to source — not all locksmiths carry them
Incorrect procedure can lock you out permanently
Always call a professional for Mosler combination changes

Mosler dial locks require a model-specific change key inserted through a change key hole on the back of the lock. Because Mosler safes are no longer manufactured and change keys can be difficult to find, we strongly recommend calling a qualified safe technician for any combination changes on Mosler locks.

Our Mosler Lock Services

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Combination Changes

Professional combo changes with correct Mosler change keys

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Safe Opening

Lost combination? We can open your Mosler safe without damage

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Lock Repair & Rebuild

Worn wheels, sticky dials, and vintage lock restoration

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Modern Lock Upgrade

Replace your Mosler dial with S&G or SecuRam electronic lock

Troubleshooting

Problem	Possible Cause	Solution
Won’t open with correct combo	Dialing too fast or passing numbers	Slow down, start over, re-dial carefully
Dial feels gritty or stiff	Worn wheels, old lubricant, or dust	Needs professional cleaning & service
Dial spins freely	Broken drive cam or spindle	Professional repair required
Handle won’t turn after dialing	Boltwork jam or relocker engaged	Do NOT force — call a safe technician
Forgot combination	N/A	Professional safe opening — call us

Need Mosler Safe Service?

Professional combination changes, safe opening, vintage lock repair, and modern upgrades. Serving all of Brevard County.

📞 (321) 224-5625