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Master Lock 21KZ 1-3/4" Laminated Steel Padlock, 5-Pin W27 Cylinder, Zero-Bitted
The Master Lock 21KZ is the industry standard for commercial and industrial physical security. Engineered to withstand severe physical abuse, this padlock features a 1-3/4" (44mm) wide laminated steel body constructed from zinc-plated steel plates for maximum strength, corrosion resistance, and structural integrity. The 15/16" (24mm) tall hardened steel shackle provides exceptional resistance against cutting and sawing, making it a reliable choice for job sites, perimeter gates, and utility facilities.
As a Zero-Bitted (KZ) model, this padlock features a rekeyable 5-pin W27 cylinder that is assembled with zero-bitted pins (all depth cuts are flat/blank). This allows locksmiths and facility managers to quickly and easily key the lock to match their existing master key systems or specific user keyways.
⚠️ Important Ordering Note: Zero-bitted padlocks do not include cut operational keys. They are designed explicitly for locksmiths, institutions, and security personnel who plan to pin the cylinder to an existing key code upon arrival.
Product Features
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Industrial Laminated Construction: High-tensile laminated steel plates are securely riveted together to offer unmatched resistance against prying, impacts, and physical attacks.
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Hardened Steel Shackle: Designed with a 5/16" diameter hardened steel shackle that offers elite resistance against bolt cutters and hacksaws.
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Dual Ball-Bearing Locking Mechanism: Employs a dual-ball locking design that tightly grips both sides of the shackle, preventing shimming, pulling, and hammering bypasses.
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Zero-Bitted (KZ) Ready: Shipped without operational pinning configurations so you can immediately cut and pin the cylinder to integrate seamlessly into your current facility infrastructure.
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Commercial-Grade W27 Cylinder: Equipped with a 5-pin, rekeyable W27 keyway layout that provides excellent pick resistance and supports extensive master-keying matrices.
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Corrosion Protection: Every individual steel plate is treated with a proprietary weather-resistant finish to maximize outdoor service life.
Product Specifications
| Specification | Details |
| Manufacturer | Master Lock Company |
| Model / MPN | 21KZ |
| Body Material | Laminated Steel (Zinc-Plated) |
| Body Width | 1-3/4" (44 mm) |
| Shackle Diameter | 5/16" (8 mm) |
| Shackle Clearance (Height) | 15/16" (24 mm) |
| Shackle Clearance (Width) | 3/4" (19 mm) |
| Shackle Material | Hardened Steel |
| Cylinder Type | 5-Pin Rekeyable (W27 Keyway) |
| Keying State | Zero-Bitted (KZ) - No Keys Included |
| Security Grade | Commercial Grade |
Manufacturer Resources
Product Specs
- Subcategory:
- Parts & Accessories
- Keyed:
- Yes
- Product Group:
- Mechanical Locks
- Product Subgroup:
- Bored Locksets
- Product Type:
- Padlocks
- Commercial/Residential:
- Residential
- Product Attribute:
- Cylindrical Locks
- Tsgs:
- master lock door lock
- Product Model:
- 21KZ
- Cylinder Classification:
- Conventional Cylinder
- Product Category:
- Mechanical Locks
- Department:
- Door Hardware