GRK GRK-10275 - RSS™ Rugged Structural Screw 3/8" x 4" Bulk Box (400 Count)
GRK GRK-10275 - RSS™ Rugged Structural Screw 3/8" x 4" Bulk Box (400 Count)
Delivery usually 1–2 business days in Ontario, 3–8 in other provinces.
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The GRK RSS™ (Rugged Structural Screw) is the premier alternative to traditional lag screws, specifically engineered for heavy-duty structural applications. Manufactured from case-hardened steel, these high-performance fasteners offer superior tensile, torque, and shear strength. The patented design features an integrated washer head with cutting teeth that seats cleanly without the need for additional washers or pre-drilling. Whether you are securing ledger boards, deck posts, or timber frames, the GRK 10275 provides an exceptionally strong connection with significantly lower installation effort compared to conventional hardware.
Performance Features
- Climatek™ Coating: ICC-ES AC257 code-approved for use in pressure-treated lumber and exterior environments.
- Zip-Tip™ Technology: Eliminates the need for pre-drilling and enables faster penetration through even the densest hardwoods.
- CEE Thread™: Enlarges the screw hole for the non-threaded shank, reducing friction and increasing drawing strength while preventing wood splitting.
- W-Cut™ Thread Design: Functions like a saw blade to clear away debris, resulting in lower driving torque and a smoother installation.
- T-40 Star Drive: Provides six points of contact to eliminate cam-out and stripping during high-torque applications.
Technical Specifications
| Screw Size | 3/8" x 4" (8.0mm x 100mm) |
| Drive Type | T-40 Star Drive |
| Material | Case Hardened Steel |
| Head Style | Built-in Washer Head |
| Coating | Climatek™ Corrosion Resistant |
| Box Quantity | 400 Screws |
| Code Compliance | ICC-ES ESR-2442 Approved |
What's Included
- (400) GRK 10275 RSS™ Structural Screws (3/8" x 4")
- (1) T-40 Pro-Bit Driver
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
Any single item over 50 lb or longer than 48 in. ships at a calculated carrier rate, shown at checkout. The other eligible items in your order still ship free. 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?
Delivery usually 1–2 business days after dispatch 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.
If a product is defective on arrival and you notice it and contact us within 3 days of delivery, Wise Line Tools will handle it and pay the shipping.
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.
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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. Delivery usually 1–2 business days after dispatch in Ontario, 3–8 in other provinces. 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. If a product is defective on arrival and you notice it and contact us within 3 days of delivery, Wise Line Tools will handle it and pay the shipping. You pay return shipping, or you can bring the item to either of our stores. See our Returns Policy and Warranty Information.
