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Silver laminated steel padlock with 3/8 inch shackle

Master Lock

Master Lock 25 Keyed Padlock 3/8" Steel

SKU CH-364X-RYH3V

Keyed steel padlock with a 3/8 in shackle, laminated body and five-pin cylinder for lockout and security use

  • 5-pin cylinder resists picking for reliable security
  • 3/8-inch hardened steel shackle withstands cutting attempts
  • Laminated steel body provides layered strength against forced entry
  • Two protective bumpers shield surfaces from lock damage
  • Master K27 keyway ensures controlled key duplication

Solid steel security for lockout and access control

The Master Lock 25 is a laminated steel padlock built for lockout/tagout and general security duties. Its five-pin K27 keyway and hardened steel shackle resist picking and cutting. Each lock is keyed differently so multiple units do not share a key.

Verify shackle clearance and key management needs

Confirm the 3/8 in shackle diameter fits the hasp, chain link or lockout point you intend to secure. The 1 in vertical clearance and 15/16 in horizontal gap must accommodate your hardware. Decide whether a unique key per lock suits your key-control system or if a master-keyed suite would be simpler.

Two protective bumpers shield the laminated body

Fitted bumpers absorb impact and reduce marring on the silver steel finish during daily handling. The non-removable key stays in the cylinder until deliberately turned, preventing accidental key loss. No control-key registration is required, so deployment is immediate.

How it compares

Measured against everything we stock in Locks, Deadbolts & Access Control, at today’s prices. Recalculated every night.

Price $16.99
Cheaper than about 85% of the 358 comparable items (median $54.99).

Specifications

Product
Brand nameMASTER LOCK

Questions about this item

What comes with the Master Lock 25 padlock and what must be purchased separately?

The padlock includes two keys and a laminated steel body with a 3/8 in steel shackle. No additional hardware or accessories are required for standard lockout or security use.

Should I choose the 5-pin K27 keyway or a different keying option for this model?

This unit is supplied with a 5-pin Master K27 keyway and is keyed differently from other locks. It does not support interchangeable cores or control-key registration, so the only choice is the factory keying.

How does the 3/8 in shackle diameter perform when the padlock is used on a real hasp or chain link?

The 3/8 in hardened steel shackle fits standard 1 in high by 15/16 in wide openings. The laminated steel body resists cutting, while the 5-pin cylinder provides high-security pick resistance for lockout/tagout and general security.

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