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Replacement Locks and Keys for 4C Horizontal Mailboxes
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Salsbury Key Keeper (Includes Commercial Lock) - Surface Mounted - Private Access$129.97 in December!Additional Discounts for 2+ units!
Usually ships within 1-2 days!
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Compx/National Tenant Cam Lock With 3 Keys Each - Hook Cam For Type I$86.00 $68.94Additional Discounts for 2+ units!
Usually ships in 1 to 2 weeks!
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Cut Key - Long Shank For CK25750 Conversion Kit - Horizontal Mailbox Replacement Part$15.00 $11.94Additional Discounts for 2+ units!
Usually ships in 1 to 2 weeks!
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Parcel Locker Lock (Hudson) w/ Cam and 2 Keys - for Tenant Side Of Captive Mechanism - Lock/Key Codes H4001-H5000 - Large$45.40 $40.85Additional Discounts for 2+ units!
Usually ships in 1 to 2 weeks!
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Wind Blank Key for K30802 Lock (Equal To Ilco R1003M Blank) Blanks Will Be Discontinued When Stock Is Depleted$12.00 $9.94Additional Discounts for 2+ units!
Usually ships in 1 to 2 weeks!
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Hudson Blank Key for 30812 Master Keyed Lock$11.00 $9.00Additional Discounts for 2+ units!
Usually ships in 1 to 2 weeks!
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Hudson Key Blank (Hl1 Blank) - for K30809 and 30803 Locks$3.00 $2.79Additional Discounts for 2+ units!
Usually ships in 1 to 2 weeks!
- Key Blank Compx/National for K91910 Lock w/ Codes 1000Ps-1999Ps Or 3000Ps-3999Ps$3.00 $2.79
Additional Discounts for 2+ units!
Usually ships Usually ships in 2-3 business days.
- Key Blank Compx/National Key Blank for K91910 Lock w/ Codes 2000Ps-2999Ps Or 4000Ps-4999Ps$3.00 $2.79
Additional Discounts for 2+ units!
Usually ships Usually ships in 2-3 business days.
- Hudson Cam Lock w/ 2 Keys Each - Lock Codes H4001-H5000 (Used On Af Horiz/Vert 2/19/07 and After)$15.10 $13.65
Additional Discounts for 2+ units!
Usually ships in 1 to 2 weeks!
- Parcel Locker Key Tag Kit - Includes 3 Plastic Key Tag Holders and Labels$18.20 $16.82
Additional Discounts for 2+ units!
Usually ships in 1 to 2 weeks!
- Lock Replacement w/ (3) Keys for Cluster Mailboxes$33.30 $27.24
Additional Discounts for 2+ units!
Usually ships in 1 to 2 weeks!
Replacement Locks and Keys for 4C Horizontal Mailboxes
Lock problems happen - tenants lose keys, locks wear out, or you need fresh security for new residents. Rather than replacing entire mailbox units, replacement locks solve these issues cost-effectively. The key is using parts specifically made for your system to maintain security and postal compliance.
Master key systems help property managers access units for maintenance, while individual locks keep tenant mail secure. Quality locks typically last 10-15 years with normal use.
Frequently Asked Questions
Match your lock model to the manufacturer’s label on the mailbox or contact customer support with your unit’s serial number for verification.
Property managers use a master key to open all compartments, while each tenant has a unique key for their individual box. This setup ensures security and accessibility.
Replace locks whenever tenants move out or lose keys. Under normal use, quality locks last 10–15 years, but replace sooner if operation becomes stiff or inconsistent.
Yes. Many lock sets include two keys, and spares can be ordered by referencing your mailbox model or lock number for accurate matching.
Yes — all approved replacement parts meet USPS standards for security and compatibility with 4C mailbox systems.
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