Grip-Rite® Flat Washer Head Structural Screws

Grip-Rite® flat head structural screws offer versatility, speed, and longevity in load-bearing exterior wood construction projects. Available in both traditional flat head and hex head styles. Both styles include an ID code stamped right into the head for easy spec reference and a load value chart conveniently located on every package. As a replacement for lag screws, Grip-Rite® structural screws feature a type 17 point that translates to both efficiency and time savings by eliminating the need to pre-drill pilot holes. The flat washer head ensures maximum fastening force and features a low profile that offers a smoother finish without sharp edges on the surface.

Our premium PrimeGuard Plus® coating assures that Grip-Rite® structural screws will last throughout a project’s lifetime. Easily identifiable, cobalt blue packaging features easy-to-read iconography, lateral load value references, and a scannable QR code that links directly to the ICC report for technical specifications.

A 3-digit, ICC-recognized code is stamped into the head for easy spec reference, and a load value chart is conveniently located on every package. 

Features & Benefits

  • No pre-drilling: 17 point coarse thread

  • Approved for use in treated lumber in exterior wood structural application

  • Protected by Grip-Rite® PrimeGuard Plus® Lifetime coating for improved corrosion resistance

  • Faster than lag screws in exterior structural wood applications

  • Flat washer head features a low profile for a smoother finish without sharp edges on the surface

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

  • 1/4” Flat Washer Head replaces 1/4” Lag Screws
  • 5/16 Flat Washer Head replaces 1/4”, 5/16”, 3/8”, 7/16” Lag Screws
  • 3/8 Flat Washer Head replaces 1/4”, 5/16” 3/8”, 7/16”, 1/2” 5/8” Lag Screws

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