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The 1/2” x 6” in. Safe Bit features a special 12.7 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 SB20 – Frequently Asked Questions
1) Will a regular carbide masonry or cobalt drill bit work on safe hardplate instead?
No. Hardplate is a hardened, often carbide-impregnated barrier specifically built to destroy ordinary bits. The SB20 is a tungsten carbide tipped bit ground for that job, with the rake and chisel geometry changed to survive the heat and pressure. Standard HSS, cobalt, or masonry bits will dull or shatter on hardplate.
2) What size is the Pro-Lok SB20 safe bit?
It is a 1/2 inch diameter bit with a 6 inch overall length. Pro-Lok also gives the tip size in metric as 12.7 mm, which is the same 1/2 inch. The 6 inch length gives you reach past the outer skin of a safe door to the hardplate behind it.
3) Why does the Pro-Lok safe bit have a negative rake angle and a shortened chisel edge?
Both are there to keep the carbide tip alive. A negative rake angle puts the cutting edge in compression rather than letting it dig, and a shortened chisel edge cuts the load at the center of the bit where a standard point tends to break down. Pro-Lok's stated result is better cutting effectiveness with fewer tip failures in hardplate.
4) Does the Pro-Lok SB20 come in more than one size or as part of a set?
The SB20 is a single item, sold as the 1/2 inch by 6 inch bit on its own. There is one model under it, so nothing to specify beyond the size when you order. Pro-Lok makes safe bits in other diameters and lengths under the same SB family if you need a different reach or hole size.
5) What kind of drill should I run a 1/2 inch safe bit in?
A 1/2 inch shank bit needs a drill with a 1/2 inch chuck capacity, and hardplate work wants low RPM with steady pressure, not speed. The SB20's carbide tip is ground to take the heat, but running it fast is still the quickest way to cook an edge. Locksmiths normally use a drill rig or safe drilling mount rather than freehand for this.
How fast can I get the Pro-Lok SB20 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 SB20 come with a warranty?
Absolutely. The Pro-Lok SB20 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 SB20?
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 SB20 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.