Grip-Rite® Flat Washer Head Structural Screws are a versatile fastener intended for use in load bearing exterior construction projects. With our premium PrimeGuard Plus® coating, these structural screws are guaranteed to last the life of your project.
To help contractors and inspectors ensure the proper load values are supplied, we use clear iconography to identify use cases. Accessing ICC reports is only a click away with the QR code included on each box. Individual fasteners include a three-digit ICC-recognized code stamped in the head for quick spec reference.
Grip-Rite® Flat Washer Head Structural Screws are engineered with the power needed to replace lag screws. With a T 17 point and aggressive coarse threads, installation is a seamless process that doesn’t require pre-drilling.
Perfect for use with a variety of materials, including wood, composites, and light gauge metal, in structural applications. Our flat washer head fasteners use a star drive type for secure connection between the tool tip and fastener for a strong connection.
PrimeGuard Plus® coating protects against corrosion and rust and includes a lifetime guarantee
Structural screws engineered to replace lag screws
Approved for use in treated lumber
Flat washer head features a low profile for a smoother finish without sacrificing strength
No pre-drilling for a more efficient process than lag screws
Star drive bit included to ensure compatibility
Flat Head
| Material | Diameter | length | Point | Thread type | Head Type | Drive Style | QTY | Coating | Color |
| GRSSFW516820 | 5/16" | 8 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-30 | 20 | PrimeGuard Plus® | Black |
| GRSSFW5168300 | 5/16" | 8 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-30 | 300 | PrimeGuard Plus® | Black |
| GRSSFW516850 | 5/16" | 8 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-30 | 50 | PrimeGuard Plus® | Black |
| GRSSFW516625 | 5/16" | 6 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-30 | 25 | PrimeGuard Plus® | Black |
| GRSSFW5166400 | 5/16" | 6 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-30 | 400 | PrimeGuard Plus® | Black |
| GRSSFW516650 | 5/16" | 6 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-30 | 50 | PrimeGuard Plus® | Black |
| GRSSFW5165150 | 5/16" | 5 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-30 | 150 | PrimeGuard Plus® | Black |
| GRSSFW516525 | 5/16" | 5 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-30 | 25 | PrimeGuard Plus® | Black |
| GRSSFW516550 | 5/16" | 5 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-30 | 50 | PrimeGuard Plus® | Black |
| GRSSFW5165500 | 5/16" | 5 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-30 | 500 | PrimeGuard Plus® | Black |
| GRSSFW5164150 | 5/16" | 4 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-30 | 150 | PrimeGuard Plus® | Black |
| GRSSFW516420 | 5/16" | 4 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-30 | 20 | PrimeGuard Plus® | Black |
| GRSSFW516450 | 5/16" | 4 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-30 | 50 | PrimeGuard Plus® | Black |
| GRSSFW5164600 | 5/16" | 4 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-30 | 600 | PrimeGuard Plus® | Black |
| GRSSFW516318150 | 5/16" | 3-1/8 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-30 | 150 | PrimeGuard Plus® | Black |
| GRSSFW51631820 | 5/16" | 3-1/8 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-30 | 20 | PrimeGuard Plus® | Black |
| GRSSFW51631850 | 5/16" | 3-1/8 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-30 | 50 | PrimeGuard Plus® | Black |
| GRSSFW516318750 | 5/16" | 3-1/8 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-30 | 750 | PrimeGuard Plus® | Black |
| GRSSFW5163150 | 5/16" | 3 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-30 | 150 | PrimeGuard Plus® | Black |
| GRSSFW516320 | 5/16" | 3 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-30 | 20 | PrimeGuard Plus® | Black |
| GRSSFW516350 | 5/16" | 3 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-30 | 50 | PrimeGuard Plus® | Black |
| GRSSFW5163750 | 5/16" | 3 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-30 | 750 | PrimeGuard Plus® | Black |
| GRSSFW51621225 | 5/16" | 2-1/2 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-30 | 25 | PrimeGuard Plus® | Black |
| GRSSFW51621250 | 5/16" | 2-1/2 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-30 | 50 | PrimeGuard Plus® | Black |
| GRSSFW516212800 | 5/16" | 2-1/2 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-30 | 800 | PrimeGuard Plus® | Black |
| GRSSFW5161020 | 5/16" | 10 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-30 | 20 | PrimeGuard Plus® | Black |
| GRSSFW51610250 | 5/16" | 10 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-30 | 250 | PrimeGuard Plus® | Black |
| GRSSFW5161050 | 5/16" | 10 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-30 | 50 | PrimeGuard Plus® | Black |
| GRSSFW38820 | 3/8" | 8 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-40 | 20 | PrimeGuard Plus® | Black |
| GRSSFW388250 | 3/8" | 8 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-40 | 250 | PrimeGuard Plus® | Black |
| GRSSFW38850 | 3/8" | 8 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-40 | 50 | PrimeGuard Plus® | Black |
| GRSSFW38620 | 3/8" | 6 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-40 | 20 | PrimeGuard Plus® | Black |
| GRSSFW386300 | 3/8" | 6 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-40 | 300 | PrimeGuard Plus® | Black |
| GRSSFW38650 | 3/8" | 6 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-40 | 50 | PrimeGuard Plus® | Black |
| GRSSFW384150 | 3/8" | 4 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-40 | 150 | PrimeGuard Plus® | Black |
| GRSSFW38420 | 3/8" | 4 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-40 | 20 | PrimeGuard Plus® | Black |
| GRSSFW38450 | 3/8" | 4 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-40 | 50 | PrimeGuard Plus® | Black |
| GRSSFW384500 | 3/8" | 4 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-40 | 500 | PrimeGuard Plus® | Black |
| GRSSFW38312150 | 3/8" | 3-1/2 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-40 | 150 | PrimeGuard Plus® | Black |
| GRSSFW3831220 | 3/8" | 3-1/2 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-40 | 20 | PrimeGuard Plus® | Black |
| GRSSFW3831250 | 3/8" | 3-1/2 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-40 | 50 | PrimeGuard Plus® | Black |
| GRSSFW38312500 | 3/8" | 3-1/2 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-40 | 500 | PrimeGuard Plus® | Black |
| GRSSFW383150 | 3/8" | 3 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-40 | 150 | PrimeGuard Plus® | Black |
| GRSSFW38320 | 3/8" | 3 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-40 | 20 | PrimeGuard Plus® | Black |
| GRSSFW38350 | 3/8" | 3 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-40 | 50 | PrimeGuard Plus® | Black |
| GRSSFW383600 | 3/8" | 3 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-40 | 600 | PrimeGuard Plus® | Black |
| GRSSFW3816150 | 3/8" | 16 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-40 | 150 | PrimeGuard Plus® | Black |
| GRSSFW381650 | 3/8" | 16 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-40 | 50 | PrimeGuard Plus® | Black |
| GRSSFW3814150 | 3/8" | 14 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-40 | 150 | PrimeGuard Plus® | Black |
| GRSSFW381450 | 3/8" | 14 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-40 | 50 | PrimeGuard Plus® | Black |
| GRSSFW381215 | 3/8" | 12 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-40 | 15 | PrimeGuard Plus® | Black |
| GRSSFW381250 | 3/8" | 12 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-40 | 50 | PrimeGuard Plus® | Black |
| GRSSFW381015 | 3/8" | 10 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-40 | 15 | PrimeGuard Plus® | Black |
| GRSSFW381050 | 3/8" | 10 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-40 | 50 | PrimeGuard Plus® | Black |
| GRSSFW14625 | 1/4" | 6 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 25 | PrimeGuard Plus® | Black |
| GRSSFW14650 | 1/4" | 6 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 50 | PrimeGuard Plus® | Black |
| GRSSFW146600 | 1/4" | 6 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 600 | PrimeGuard Plus® | Black |
| GRSSFW145150 | 1/4" | 5 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 150 | PrimeGuard Plus® | Black |
| GRSSFW14525 | 1/4" | 5 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 25 | PrimeGuard Plus® | Black |
| GRSSFW14550 | 1/4" | 5 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 50 | PrimeGuard Plus® | Black |
| GRSSFW145750 | 1/4" | 5 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 750 | PrimeGuard Plus® | Black |
| GRSSFW14412150 | 1/4" | 4-1/2 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 150 | PrimeGuard Plus® | Black |
| GRSSFW1441225 | 1/4" | 4-1/2 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 25 | PrimeGuard Plus® | Black |
| GRSSFW1441250 | 1/4" | 4-1/2 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 50 | PrimeGuard Plus® | Black |
| GRSSFW14412750 | 1/4" | 4-1/2 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 750 | PrimeGuard Plus® | Black |
| GRSSFW1441000 | 1/4" | 4 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 1000 | PrimeGuard Plus® | Black |
| GRSSFW144150 | 1/4" | 4 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 150 | PrimeGuard Plus® | Black |
| GRSSFW14425 | 1/4" | 4 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 25 | PrimeGuard Plus® | Black |
| GRSSFW14450 | 1/4" | 4 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 50 | PrimeGuard Plus® | Black |
| GRSSFW1431000 | 1/4" | 3 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 1000 | PrimeGuard Plus® | Black |
| GRSSFW14325 | 1/4" | 3 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 25 | PrimeGuard Plus® | Black |
| GRSSFW14350 | 1/4" | 3 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 50 | PrimeGuard Plus® | Black |
| GRSSFW142121500 | 1/4" | 2-1/2 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 1500 | PrimeGuard Plus® | Black |
| GRSSFW1421225 | 1/4" | 2-1/2 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 25 | PrimeGuard Plus® | Black |
| GRSSFW1421250 | 1/4" | 2-1/2 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 50 | PrimeGuard Plus® | Black |
| GRSSFW921225 | #9 | 2-1/2 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 25 | PrimeGuard Plus® | Black |
| GRSSFW921250 | #9 | 2-1/2 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 50 | PrimeGuard Plus® | Black |
| GRSSFW911225 | #9 | 1-1/2 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 25 | PrimeGuard Plus® | Black |
| GRSSFW91123000 | #9 | 1-1/2 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 3000 | PrimeGuard Plus® | Black |
| GRSSFW911250 | #9 | 1-1/2 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 50 | PrimeGuard Plus® | Black |
| GRSSFW1031500 | #10 | 3 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 1500 | PrimeGuard Plus® | Black |
| GRSSFW10325 | #10 | 3 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 25 | PrimeGuard Plus® | Black |
| GRSSFW10350 | #10 | 3 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 50 | PrimeGuard Plus® | Black |
| GRSSFW102121500 | #10 | 2-1/2 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 1500 | PrimeGuard Plus® | Black |
| GRSSFW1021225 | #10 | 2-1/2 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 25 | PrimeGuard Plus® | Black |
| GRSSFW1021250 | #10 | 2-1/2 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive T-25 | 50 | PrimeGuard Plus® | Black |
| GRSSFW1011225 | #10 | 1-1/2 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive | 25 | PrimeGuard Plus® | Black |
| GRSSFW1011250 | #10 | 1-1/2 " | Type 17 Point | Coarse Thread | Flat Washer Head | Star Drive | 50 | PrimeGuard Plus® | Black |
LAG SCREW REPLACEMENT GUIDE
