BEST 8K Series Patio Non-Keyed...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$938.00
$541.96
BEST BEST 8K Series - Patio (P) Non-Keyed Grade 1 Heavy Duty Knob Lock BEST-8K-P

BEST 8K Series Patio Non-Keyed Grade 1 Heavy Duty Cylindrical Knob Lock

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Model: 8K30P4ASTK619
$938.00
$541.96
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$938.00
$541.96
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BEST 8K Series Patio Non-Keyed Grade 1 Heavy Duty Cylindrical Knob Lock

Premium Grade 1 Cylindrical Knob Lock for Heavy-Duty Commercial Applications

The BEST 8K Series Patio Non-Keyed Grade 1 Heavy Duty Cylindrical Knob Lock delivers dependable security for high-traffic commercial applications. This premium knob set features knobs machined from solid brass or bronze bar stock with a 2 1/8" diameter and 2 7/8" projection from door. Designed with a 2 1/16" diameter chassis to fit 2 1/8" door holes and adjustable for door thickness from 1 3/8" to 2", this Grade 1 certified lock exceeds ANSI requirements for security and reliability in demanding commercial environments.

Professional Features & Benefits

  • Heavy-Duty Construction: Knobs machined from solid brass or bronze bar stock with brass or bronze roses reinforced with steel liner for exceptional durability in commercial applications.
  • Grade 1 Certification: Exceeds ANSI Grade 1 requirements for security and reliability, ensuring professional-grade performance in high-traffic environments.
  • Precision Dimensions: 2 1/16" diameter chassis fits standard 2 1/8" door holes with adjustable door thickness accommodation from 1 3/8" to 2" for versatile installation options.
  • Enhanced Security Features: 9/16" throw deadlocking latch with no keeper hole on keyed knobs and snap-on inside rose with no exposed screws to deter attack attempts.
  • Smooth Operation: Steel retractor with low friction bearings and long bearing length in chassis provide smooth, wear-resistant operation throughout the lock’s service life.
  • Versatile Rose Options: Available with multiple rose styles including round 3 3/4" diameter (A), round 2 9/16" diameter (C), and convex round 3 3/8" diameter (D) for various aesthetic preferences.
  • Professional Strike Options: Standard STK strike (2 3/4" x 1 1/8") and optional S3 strike (4 7/8" x 1 1/4") available to accommodate different door and frame configurations.
  • Corrosion-Resistant Components: Internal parts are brass or corrosion-treated steel designed for long product life and reliable performance in demanding environments.

Technical Specifications

  • Commercial/Residential: Commercial
  • Department: Door Hardware
  • Door Hand Direction: Non-Handed
  • Duty Level: Heavy Duty
  • Electronic: No
  • Grade: Grade 1
  • Handle Type: Knob
  • Keyed: No
  • Keyed Function: Non-Keyed
  • Product Attribute: Cylindrical Locks
  • Product Category: Mechanical Locks
  • Product Function: Patio/Privacy
  • Product Group: Mechanical Locks
  • Product Subgroup: Bored Locksets
  • Product Type: Knobsets
  • Series: 8K Series
  • Subcategory: Bored Locksets

Installation & Operation

  1. Review manufacturer specifications and verify door preparation requirements including door thickness (1 3/8" to 2" standard), 2 1/8" bore hole, and 1" latch hole dimensions.
  2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and frame surfaces for proper chassis and strike alignment.
  3. Prepare door by drilling 2 1/8" diameter hole for chassis and 1" diameter hole in door edge for latch housing as specified in manufacturer instructions.
  4. Install chassis, latch assembly, and strike hardware securing all components per manufacturer torque specifications with provided screws.
  5. Adjust knob operation and latch alignment for proper engagement with strike and smooth operation throughout the full range of motion.
  6. Test lock operation to verify proper latch function, knob rotation, and strike engagement. Make final adjustments as needed and refer to manufacturer documentation for complete installation details and troubleshooting.

Professional Applications

  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Government and Military Facilities
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential Properties
  • International Projects in Non-ADA Compliant Regions

Why Choose BEST Quality?

BEST 8K Series cylindrical knob locks deliver professional-grade reliability with solid brass or bronze construction and Grade 1 certification that exceeds ANSI requirements for security and performance. Internal components feature corrosion-resistant treatment and precision engineering including steel retractor with low friction bearings for long-term dependable operation. Engineered for demanding commercial applications where heavy-duty construction and reliable security performance are essential.

Product Specs

Series:
8K Series
Grade:
Grade 1
Duty Level:
Heavy Duty
Keyed Function:
Non-Keyed
Product Group:
Mechanical Locks
Product Subgroup:
Bored Locksets
Product Type:
Knobsets
Subcategory:
Bored Locksets
Keyed:
No
Electronic:
No
Commercial/Residential:
Commercial
Handle Type:
Knob
Product Attribute:
Cylindrical Locks
Product Function:
Patio/Privacy
Door Hand Direction:
Non-Handed
Product Category:
Mechanical Locks
Department:
Door Hardware

BEST 8K30P4ASTK619 – Frequently Asked Questions

1) What is the difference between the BEST 8K patio function and a standard privacy knob lock?
The 8K patio lock is non-keyed and locks from the inside only, with no outside key or emergency release. That is the distinction from a bed/bath privacy set, which normally has a small emergency unlocking hole on the outside knob. Patio function suits a door where you want someone inside to secure the opening and nobody outside to have any access, like a rear patio or a service door. If you need staff to be able to unlock a bathroom from the corridor, this isn't the function you want.
2) Will a BEST 8K knob lock fit a 1-3/4 inch commercial door?
Yes. The 8K chassis adjusts for door thickness from 1-3/8 inches up to 2 inches, so the standard 1-3/4 inch commercial door sits in the middle of the range. Thicker doors up to 2 inches are covered too, and there is a 3-3/8 inch concave thick-door rose option for those. Door prep is a 2-1/8 inch cross bore (the chassis is 2-1/16 inches in diameter) and a 1 inch hole in the door edge for the latch.
3) Does the 8K knob lock come in a 5 inch backset for a wide stile or aluminum door?
Both backsets are offered: 2-3/4 inches, which is the standard commercial bore location, and 5 inches for wide stile applications. Pick the 5 inch version only if the existing cross bore is already at 5 inches from the door edge, since backset is not field adjustable on this chassis. Residential doors bored at 2-3/8 inches are not covered.
4) Will the 8K latch engage my existing strike, and which strike should I order?
The latch is a deadlocking type with a 9/16 inch throw, so it needs a strike lip and frame prep that lines up with that projection. Two strikes are offered: the standard STK at 2-3/4 by 1-1/8 inches, and the ANSI S3 at 4-7/8 by 1-1/4 inches. If the frame is already cut for an ANSI strike box, order the ANSI option; if you are replacing a lock in an older frame with a small strike cutout, the standard strike matches that prep.
5) Is a knob lock like the BEST 8K acceptable on an ADA compliant opening?
No. A round or tulip knob requires grasping and twisting, which is why the 8K's stated applications include international projects in regions without ADA requirements. On an accessible opening in the US you need lever trim, not a knob. Use the 8K where knobs are still permitted, such as mechanical rooms, storage, and non-accessible service doors.
6) What is the closest Grade 1 heavy duty knob lock to the BEST 8K patio if I need a non-keyed function on a commercial door?
Within heavy duty cylindrical knobsets, the Schlage D10S is a Grade 1 non-keyed knob lock with an Orbit knob in a passage latch function, and the Falcon X101 is a Grade 1 heavy duty cylindrical passage knobset that takes an interchangeable core and carries a fire rating, with a 1-3/8 inch to 2-1/4 inch door thickness range. The Corbin Russwin CK4310 is another Grade 1 non-keyed Global knob lock, rated for 1-3/8 inch to 2 inch doors. All three differ in function from the BEST 8K patio, which is a patio/privacy function that locks from the inside rather than staying free-swinging both ways.
7) I need a privacy knob for a bathroom door but Grade 1 is more than the job calls for. What is a lighter option?
For lighter traffic, the Dexter C2000 privacy knob is a Grade 2 cylindrical ball knob lock for 1-3/8 inch to 1-3/4 inch doors, and the Pamex FTF Baron and Cal-Royal BER20 are Grade 3 privacy knob locksets over the same 1-3/8 inch to 1-3/4 inch door range. The BEST 8K patio is Grade 1 heavy duty and adjusts for door thickness from 1-3/8 inch to 2 inch, so it is the one to keep where the door is thicker than 1-3/4 inch or the traffic is institutional.
8) The door needs a key, not a privacy button. What should I order instead of the BEST 8K patio?
The 8K patio is non-keyed, so it will not accept a cylinder. For a keyed opening, the Corbin Russwin CK4851 is a Grade 1 entrance/office Global knob lock with a conventional cylinder for 1-3/8 inch to 2 inch doors, and the Sargent 8XG04 is a Grade 1 heavy duty storeroom/closet single cylinder knob lock on a 2-3/4 inch backset. Sargent's 6G04 covers the same storeroom/closet function at Grade 2 standard duty.
9) Is a passage knob the same thing as the BEST 8K patio function?
No. The BEST 8K patio is a patio/privacy function, which locks. A passage knob never locks at all, which is what the Arrow MK01 and RK01 Grade 2 knobs, the Dexter C2000 passage knob, and the Corbin Russwin CK4410 Grade 2 Global knob all are. Ordering a passage set for an opening that needs to be secured from the inside will leave the room unlockable.
10) The door is 2 inches thick. Which knob locksets actually cover that?
The BEST 8K adjusts for door thickness from 1-3/8 inch to 2 inch, and offers a 3-3/8 inch concave thick-door rose. Among other knobsets, the Corbin Russwin CK4310 Grade 1 and CK4851 Grade 1 both list 1-3/8 inch to 2 inch, the Falcon X101 goes to 2-1/4 inch, and the Deltana 3381 and 6171 entry knobs cover 1-3/8 inch to 2 inch. Grade 3 sets such as the Pamex FT3 and Cal-Royal BER00 stop at 1-3/4 inch.
11) Do I have to specify handing when ordering a BEST 8K patio knob lock?
No handing to specify. The 8K cylindrical knob lock is non-handed, so one part number works on a left or right hand door, inswing or outswing. That is useful for a property manager stocking spares, since one lock covers every opening in the building regardless of swing.
12) Which rose and finish options do I need to pick to match the other BEST locks in my building?
Four roses are offered: 2-9/16 inch concave, 3-3/8 inch concave, 3-3/8 inch concave for thick doors, and 3-3/8 inch convex. The larger 3-3/8 inch roses cover more of the door face, which helps when you are replacing an older lock and want to hide the previous prep. Finishes run 605 bright brass, 606 satin brass, 611 bright bronze, 612 satin bronze, 613 oil-rubbed satin bronze, 619 satin nickel, 625 bright chrome, 626 satin chrome, 626AM satin chrome antimicrobial, and 690 statuary dark bronze. 626 is the usual match for existing commercial hardware.
13) Is a Grade 2 knob lock good enough, or do I need Grade 1 for a high traffic door?
The 8K is Grade 1 heavy duty and built for commercial traffic: solid brass or bronze knobs, steel-lined roses, and a steel retractor running on low friction bearings. On a door cycled hundreds of times a day, that is what holds up. For lighter interior openings, Grade 2 options like the Corbin Russwin CK4410 or the Dexter C2000 passage knob will do the job at a lower duty level, and Grade 3 sets such as the Cal-Royal BER20 privacy knob are light residential duty. Note that Grade 2 units like the CK4410 and the C2000 top out at 1-3/4 inch doors, while the 8K goes to 2 inches.
14) Can I use a dummy knob in place of the BEST 8K patio knob lock?
No, a dummy knob has no latch and no locking mechanism, so it only pulls a door shut. The Schlage A170 single dummy trim, the Cal-Royal BA40 Barrington dummy, and the Bravura Biloxi dummy knobset all fall in that group. The BEST 8K patio is a working cylindrical lockset with a 9/16 inch throw deadlocking latch, so it is not interchangeable with dummy trim on an active opening.
15) We have residential apartment interiors to do, not institutional doors. What privacy knob fits that better than the BEST 8K?
For residential interiors, the Baldwin Estate 5000 Baltimore knob privacy set comes preconfigured with a 2-3/8 inch backset and full lip strike, the Baldwin Estate 5077 Bethpage is a privacy knob on an R027 rose, and the Deltana 6112 St. Thomas is a privacy knob for 1-3/8 inch to 2 inch doors. The BEST 8K is a Grade 1 commercial knobset offered on 2-3/4 inch and 5 inch backsets, so it suits corridor and institutional openings rather than decorative residential interiors.
16) I need a knob lock on a labeled fire door. Does the BEST 8K patio cover that, or is there a better choice?
For a labeled opening, the Falcon X101 Grade 1 heavy duty passage knobset and the Falcon W101 Grade 2 medium duty passage/closet knob lock with a 2-3/4 inch backset both carry a fire rating. The BEST 8K is a Grade 1 heavy duty patio/privacy knobset; confirm the label requirements for the specific function before specifying it on a rated door.
17) What should I use for a door that needs coded entry instead of a privacy knob?
The Lockey 3830 is a mechanical keyless combination knob lock with an auto-locking passage function for doors 1 3/16 inch to 2 inch thick, so no key or credential is carried. The BEST 8K patio is a mechanical non-electronic knobset with a thumbturn-style patio/privacy function, so it does not offer code entry.
18) Is the BEST 8K knob a substitute for exit device knob trim?
No. Trim such as the Sargent 28C-KNOB, which is exit device trim with a knob and rose in an entrance function for 1-3/4 inch doors, the Sargent 78-2875 outside knob only with B design, and the Imperial USA ED-BKL580 knob trim in a storeroom function all mount to an exit device and have no chassis or latch of their own. The BEST 8K is a complete cylindrical knobset with its own chassis sized for a 2-1/8 inch bore and a 1 inch latch hole.
19) Which knobset should I use if the opening needs classroom function rather than patio?
For classroom function, the Dexter C2000 is a Grade 2 non-clutching cylindrical ball knob classroom lock for 1-3/8 inch to 1-3/4 inch doors. The BEST 8K is a non-keyed patio/privacy set and cannot be keyed for classroom control.
20) How much does a BEST 8K knob stick out from the door face?
The knob projects 2-7/8 inches from the door and measures 2-1/8 inches in diameter. That matters where a door swings back against a wall, into a narrow corridor, or beside a return wall, since the knob is what hits first. Round and tulip knob styles are both available.
21) Is the antimicrobial 626AM finish worth it for a healthcare facility?
626AM is satin chrome with an antimicrobial treatment, and it is one of the ten finish choices on the 8K knob. For patient rooms, clinics, and food service areas where touch surfaces get specified, it is the option to order; elsewhere plain 626 satin chrome is the same appearance. Note that the knobs themselves are machined from solid brass or bronze bar stock with a steel-reinforced rose underneath, so the finish sits on heavy-duty hardware either way.
How fast can I get the BEST 8K30P4ASTK619 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 8K30P4ASTK619 come with a warranty?
Absolutely. The BEST 8K30P4ASTK619 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 8K30P4ASTK619?
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 8K30P4ASTK619 from ZenSupply?
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