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Description
Falcon X521 Office Knob LockOverview The X Series heavy duty cylindrical knob lock features optional XC construction that combines a stainless steel and nonferrous built chassis with stainless steel trim to resist corrosion when exposed to moisture and salt. It is ideal for government and military applications that are in marine environments. The X Series is UL listed and is certified ANSI BHMA A156. 2 Series 4000 Grade 1 for durability. The interchangeable cores provide quick,
Overview
The X Series heavy-duty cylindrical knob lock features optional XC construction that combines a stainless steel and nonferrous-built chassis with stainless steel trim to resist corrosion when exposed to moisture and salt. It is ideal for government and military applications that are in marine environments.
The X Series is UL listed and is certified ANSI/BHMA A156.2 Series 4000 Grade 1 for durability. The interchangeable cores provide quick, convenient re-keying and are compatible with cores built by other manufacturers. The X Series is designed for those unique applications that can use a knob and need added strength for security.
Function
- Brass or cold-formed steel construction with a zinc dichromate for rust resistance
- Interchangeable cores can be removed for quick, easy re-keying
- Interchangeable cores are compatible with SFIC products from other manufacturers
- Heavy-wrought brass, bronze or stainless steel roses over steel through-bolted rose inserts provide added strength
- Available in multiple knob designs and finishes
- 10-year limited warranty
- ANSI/BHMA: Certified ANSI/BHMA A156.2, Series 4000, Grade 1
- UL: UL 3-hour A label
View the Falcon Locks catalog for full design and finish offerings.
- Knobs and roses are wrought brass, bronze or stainless steel installed over steel or nonferrous reinforcing plates
- Knobs are secured by a spring-loaded retainer
- Retainer cannot be depressed when locks have been locked
- Abrasive-coated knobs are available to help identify entrances to hazardous areas to the handicapped
- Knurled knobs are available to identify entrances to hazardous areas for the handicapped
- Knob styles include:
- Hana-Gala
- Troy-Gala
- Troy-York
- Hana-York
- Elite-Gala
- Elite-York
- Available in:
- Bright brass (605)
- Satin brass (606)
- Satin bronze (612)
- Oil-rubbed bronze (613)
- Bright chrome (625)
- Satin chrome (626)
- Satin stainless steel
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In accordance with California PROP65 - WARNING: Cancer & Reproductive Harm P65Warnings.ca.gov
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.2 ★★★★★
Based on 29 reviews
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Product Reviews
★★★★★ 5
A Difficult to Find T-Shirt
These T-Shirts are nice. A super difficult to find. The manufacturer calls it a mock-turtle neck (MTN). But the collar height is actually a bit shorter than the traditional MTN, which is great. It's closer to a regular T-Shirt that comes all the way to the neckline. And very somt a comfortable. This is the perfect style of T-Shirt to wear under a sportscoat, if desired. Or under a shirt where you want the T-Shirt to show for contrast. Just the right look.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 17, 2026
★★★★★ 1
Sugerencia
Me llego pero el pedido tiene un fuerte mal olor a agua tipo de químico que aún lavandolo no se se va el mal olor . primera ves que me pasa esto
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 7, 2026
★★★★★ 4
Nice shirts for the price! But do not recommend for thick body types.
I bought 3 different ones. 2 Mediums and 1 2XL. The mediums fit correct and really nice! Would definitely recommend for the price! More like a exercise material, and sticks to your body shape... Sooo the 2Xl did not fit the person correct. Was so tight... And the strech is to stick to your body... So would not recommend for anyone a bit hefty or fit tbh. But the shirts are good materials and feel nice for a fresh day out or to use as gym clothes!!
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Reviewed in the United States on August 26, 2025
★★★★★ 5
Great Value heat gear material with high neck collar and loose fitting
Color: Black, Size: X-Large
My husband has been looking for mock neck shirts that are comparable to UA heat gear material but that are short sleeve and fit loose to wear under his work uniform. These seemed to have been a good soft quality option and the price is is great.
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Reviewed in the United States on December 4, 2025
★★★★★ 5
Bought second one
Color: Navy, Size: Medium
I bought the black T-shirt about a month ago and really liked the quality the fabric is soft, the fit is great, and it holds up well after washing. So I decided to get the same one in dark blue.Very satisfied with the purchase
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 9, 2025
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