GRK GRK-10299 - RSS 3/8" x 12" Rugged Structural Screw, 300-Count Bulk Box
GRK GRK-10299 - RSS 3/8" x 12" Rugged Structural Screw, 300-Count Bulk Box
Usually 1–2 business days in Ontario, 3–8 elsewhere in Canada. Delivery times are estimates.
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The GRK RSS (Rugged Structural Screw) 10299 is the ultimate high-performance alternative to traditional lag screws, specifically engineered for heavy-duty structural applications. Made from case-hardened steel, these 3/8" x 12" screws provide exceptional tensile, torque, and shear strength, making them ideal for ledger boards, deck posts, playground equipment, and multi-ply LVL fastening. Featuring the patented Climatek™ coating, these fasteners are code-approved for use in pressure-treated lumber and offer superior corrosion resistance for both interior and exterior environments.
Performance Features
- Zip-Tip™ & W-Cut™: Enables fast penetration and eliminates the need for pre-drilling in most wood species, significantly reducing installation time and effort.
- CEE Thread™: Enlarges the screw hole for the non-threaded portion, allowing the wood to settle naturally and increasing the screw's drawing strength while reducing friction and splitting.
- Climatek™ Coating: Provides a durable, AC257 code-approved barrier against corrosion, specifically tested for use in ground-contact and treated lumber.
- Recessed Star Drive: The T-40 drive interface provides six points of contact for zero-stripping and maximum torque transfer.
- Integrated Washer Head: Features a built-in shield that offers massive clamping force with a clean, low-profile finish.
Technical Specifications
| Diameter | 3/8" (9.5mm) |
| Length | 12" (305mm) |
| Drive Type | T-40 Star (Torx) |
| Material | Case-Hardened Steel | Climatek™ (Gold) |
| Tensile Strength | 1,941 lbs |
| Shear Strength | 1,231 lbs |
| Standards | ICC-ES ESR-2442; AC257 Compliant |
What's Included
- (300) 3/8" x 12" RSS Rugged Structural Screws
- (1) T-40 Star Drive Bit
Shipping & Returns
Shipping & Returns
Free Shipping Canada Wide* on Orders Over $149
Eligible items ship free on orders over $149 (before tax).
Free Shipping Policy Restrictions
Items that ship at carrier rates. An item doesn’t ship free if it, or its shipping box, weighs over 50 lb, is longer than 48 in. or has two sides over 30 in., or is bigger than 4 cubic feet (about a 24 × 24 × 12 in. box). Carriers charge these by size, not just weight. These items say “Shipping charge applies” on the product page, and you’ll see the exact cost at checkout before you pay. Orders to the Northwest Territories, Yukon and Nunavut, and to a few remote postal areas (codes starting A0K, A0P, A2V, G0G, J0M, R0B or V0T), are not eligible for free shipping and are charged carrier rates at checkout. *Our free shipping policy is subject to change without notice.
How long will it take to get my order?
Typical delivery times after your order ships: 1–2 business days in Ontario; 3–5 in Quebec, the Atlantic provinces (NS, NB, PE) and the Prairies; 5–8 in BC and Newfoundland & Labrador. Expedited shipping is available at extra cost on request.
Most in-stock orders placed by 12:00 PM ET (Monday–Friday) ship the same day. Orders placed after 12:00 PM ET, on weekends or on holidays ship the next business day.
Large, overweight and LTL freight orders may need 1 or more extra business days to prepare.
What shipping carriers do you use?
Most orders are shipped courier via Purolator, UPS, or Canada Post. We will use other carriers at our own descretion depending on Product size and weight.
Do you ship overseas?
We are not currently shipping to the USA. We are currently mainly shipping within Canada, and we are slowly adding Other Countries. Please Contact us if you are unable to Checkout. See more out International Orders HERE
I only received part of my order, where is the rest?
Your order may ship in more than one package depending on the quantity or size of the products purchased. Also, items in your order may ship from either of our 2 locations and arrive in separate deliveries.
Sometimes we place smaller items from your order inside of one box to save on shipping so always open all boxes to confirm what you have recieved.
Can I return my product?
Returns and exchanges follow the manufacturer's satisfaction guarantee for each brand. Please contact us before sending anything back, and we will tell you where to send it.
Please inspect your order when it arrives. If an item arrived damaged, is defective, or isn't what you ordered, contact us with your order number and photos. We'll cover return shipping and send a replacement or refund. For shipping damage, please let us know within 7 days of delivery so we can file a claim with the carrier. Defects and wrong items can be reported any time within our 30-day return window. After 30 days, defects are covered by the manufacturer's warranty.
You pay the shipping cost of returning an item, or you can bring it to either of our stores.
See our Returns Policy and Warranty Information for details.
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
Discover more in our FAQ
Shoot our team an email & we’ll get back to you ASAP
How fast will my order ship?
How fast will my order ship?
Most in-stock orders placed before 12 PM ET (Mon–Fri) ship the same day. Usually 1–2 business days in Ontario, 3–8 elsewhere in Canada. Delivery times are estimates. You will get a tracking email once your order ships.
Do you ship internationally?
Do you ship internationally?
We mainly ship within Canada and are not currently shipping to the USA. Please contact us about other international orders.
What is your return policy?
What is your return policy?
Returns and exchanges follow the manufacturer's satisfaction guarantee. Please contact us before sending anything back. Please inspect your order when it arrives. If an item arrived damaged, is defective, or isn't what you ordered, contact us with your order number and photos. We'll cover return shipping and send a replacement or refund. For shipping damage, please let us know within 7 days of delivery so we can file a claim with the carrier. Defects and wrong items can be reported any time within our 30-day return window. After 30 days, defects are covered by the manufacturer's warranty. You pay return shipping, or you can bring the item to either of our stores. See our Returns Policy and Warranty Information.
