BEST KD303 9K Door Handle Dril...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$16.00
$11.70
BEST KD303 9K door handle drill jig for cylindrical lock installation

BEST KD303 9K Door Handle Drill Jig for Cylindrical Lock Installation

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Model: KD303

In Stock (leaves warehouse same day if ordered before 3pm ET)

$16.00
$11.70
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BEST KD303 Drill Jig for 9K Cylindrical Lock Installation

The BEST KD303 is a drill jig for aligning 5/16" through bolt holes during 9K cylindrical lock installation. It inserts into a standard 2-1/8" bored hole and registers against the door edge to guide the drill bit, eliminating layout errors on commercial door preparations. Part of the BEST KD Series installation accessories.

Key Features

  • Through Bolt Alignment: Positions the 5/16" through bolt holes accurately for proper 9K cylindrical lock mounting.
  • Standard Bored Hole Fit: Inserts into a 2-1/8" bored hole for compatibility with standard commercial door preparations.
  • 9K Series Specific: Engineered for BEST 9K cylindrical lock installations.
  • Repeatable Results: Provides a fixed alignment reference for consistent hole placement across multiple doors.

Specifications

  • Model: KD303
  • Series: KD Series
  • Compatible Lock Series: BEST 9K Cylindrical
  • Bored Hole Size: 2-1/8"
  • Through Bolt Hole Size: 5/16"
  • Type: Installation Accessory

Typical Applications

  • Locksmith installation services
  • Commercial door hardware installation
  • Institutional facility maintenance
  • Security system integration
  • Building contractor door preparation
  • Property management lock replacement

Why BEST KD303?

Precise through bolt hole placement is critical for 9K cylindrical lock function and security. The KD303 jig removes the measurement step from the installation workflow, reducing callbacks and rework on commercial door preparations.

Manufacturer Resources

D Series Service Equipment

Product Specs

Subcategory:
Parts and Accessories
Series:
KD Series
Product Group:
Parts and Accessories
Product Subgroup:
Parts and Accessories
Product Type:
Cylindrical/Tubular Equipment
Parts and Accessories Type:
Installation Accessories
Product Attribute:
Parts and Accessories
Tags:
lock drill jig, tubing drill jig
Product Model:
KD303
Product Category:
Door Trim and Accessories
Department:
Door Hardware

BEST KD303 – Frequently Asked Questions

1) What is the BEST KD303 drill jig used for?
The KD303 is an installation jig, not a lock part. It drops into the 2-1/8 inch bored hole in the door and indexes off the door edge so you can drill the two 5/16 inch through bolt holes for a BEST 9K cylindrical lock in the right place, first time. If you are prepping doors by hand or field-modifying an existing bore, it takes the layout guesswork out.
2) Will the BEST KD303 jig work on a standard 2-1/8 inch door bore?
That is exactly the prep it is built for. The KD303 inserts into a standard 2-1/8 inch bored hole, which is the normal cross bore on commercial and residential doors prepped for cylindrical locks, and registers against the door edge from there. If the door is already bored to 2-1/8 inches, the jig seats.
3) Can I use the KD303 drill jig for BEST lock series other than the 9K?
The KD303 is set up for BEST 9K cylindrical lock installations specifically, aligning the through bolt holes to that lock's mounting pattern. For a different BEST series or a mortise or exit device prep, this is the wrong jig, you want the installation template that matches that product's prep.
4) Does the KD303 bore the 2-1/8 inch hole, or do I still need a hole saw?
You still need to bore the door. The KD303 goes into a 2-1/8 inch hole that already exists and only guides the 5/16 inch through bolt drilling from there. Budget a separate 2-1/8 inch hole saw and the latch bore for new door prep, the jig covers the alignment step only.
5) What size drill bit do I need with the BEST KD303 jig?
A 5/16 inch bit. The jig guides the bit for the through bolt holes that mount a 9K cylindrical lock, so the bit size and the jig are matched, use anything else and the bolts will not pull up square.
6) Is the BEST KD303 a lock part or a tool I order once?
It is a tool. The KD303 is a BEST KD Series installation accessory, so it is bought per installer or per truck, not per door. One jig preps as many openings as you have, which is the point of it on a multi-door retrofit where every lock has to go on the same way.
7) How many KD303 jigs do I need for a crew doing a building-wide 9K lock changeover?
One per installer working a door. The KD303 is reusable hardware built for repeated commercial installs, so it is not consumed per opening, but it can only be in one bore at a time. Two techs prepping in parallel means two jigs, otherwise one is standing around waiting for it.
How fast can I get the BEST KD303 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 BEST KD303 come with a warranty?
Absolutely. The BEST KD303 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 BEST KD303?
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 BEST KD303 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.
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