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The 1/4” x 4” in. Safe Bit features a special 6.4 mm Tungsten Carbide tip with a unique negative rake angle and a shortened chisel edge that increases it’s effectiveness and reduces tip failure. Each PRO-LOK® Butter Bit is diamond ground for razer sharpness to withstand the rigors and temperatures a locksmith may encounter when drilling hardplate for entry into a safe.
Manufacturer Resources
Product Specs
- Subcategory:
- Locksmith Tools
- Product Subgroup:
- Locksmith Tools
- Product Type:
- Safe Bits
- Product Category:
- Safe Bits
- Department:
- Door Hardware
Pro-Lok SB05 – Frequently Asked Questions
1) Will a Pro-Lok safe bit drill through hardplate, or do I need a different bit?
Hardplate is exactly what the Pro-Lok Butter Bit is ground for. The tip is 6.4 mm tungsten carbide with a negative rake angle and a shortened chisel edge, which cuts tip failure when you are drilling hardplate to make entry on a safe. A standard HSS or cobalt twist bit will glaze or snap on hardplate; this one is diamond ground and built to take the heat that comes with that cut.
2) What does the negative rake angle on a safe drilling bit actually do for me?
It changes how the carbide meets the steel. Instead of the tip trying to bite and lift a chip the way a positive rake bit does, a negative rake edge scrapes and takes the load in compression, which is what keeps carbide from chipping out on hardplate. Pro-Lok pairs that with a shortened chisel edge at the center, so less of the cutting is done by the slowest-moving part of the tip. The practical result the manufacturer states is better effectiveness and fewer failed tips per opening.
3) Do I need a drill rig for a Pro-Lok safe bit or can I run it in a cordless drill?
Carbide with a negative rake needs steady feed pressure and low, controlled RPM, which is what a safe drill rig gives you. Free-handing it in a cordless drill lets the bit wander and chatter, and chatter is what chips a carbide tip. Mount the bit in a rig, keep the pressure constant, and let the geometry do the cutting.
4) Is the Pro-Lok Butter Bit the same thing as a Pro-Lok safe bit?
Same bit. Pro-Lok calls its safe drilling bits Butter Bits, and the SB05 is one of them. If a locksmith on a forum tells you to run a Butter Bit on a hardplate job, that is the tungsten carbide tipped safe bit being described, not a separate product line.
5) Is a carbide safe bit reusable or is it a one-opening consumable?
Treat it as a wearing tool. The carbide tip is diamond ground sharp from the factory and the geometry is aimed at reducing tip failure, but hardplate drilling loads and heats the edge every time you use it, so cutting speed drops as the edge dulls. Working safes regularly, carry spares in the sizes your rig uses rather than counting on one bit to finish an unknown job.
How fast can I get the Pro-Lok SB05 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
U.S.
Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Pro-Lok SB05 come with a warranty?
Absolutely. The Pro-Lok SB05 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Pro-Lok SB05?
You can call, text, or email our expert support team for fast answers. We’re here to help with
product
selection,
installation tips, and troubleshooting. Contact Us
Why buy the Pro-Lok SB05 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support,
and
rewards on
every order.
Our team is always ready to help you choose the right product for your project.