ZAC® and MAC™  roofing screws


Trust the strength of precision cold forged ZAC®  Impax™ and MAC Impax™ screws to endure heavy clamping loads and maximum drill speeds.  Both fasteners safeguard against red rust.


Every detail of the metal-to-metal screw accommodates the rigors of roofing and exterior cladding, from the uncompromising point strength to the zinc alloy cap head which prevents red rust. Explore our broad range to find the ideal fastener for your specific application. Our MAC™ Impax™ fasteners offer low driving requirements and thread engagement torque, resulting in optimal strength backed by our limited lifetime warranty.  

MAC™ Impax™ 304 stainless steel capped fasteners

#12-14 MAC™ Impax™ SD3

  • 5/16" AF Stainless capped hex washer head
  • #3 self-drill point
  • EPDM washer
  • Drilling capacity: .035-.210"
  • Available lengths: 1", 1-1/4", 1-1/2"
Product Data Sheet | PDF

1/4-14 MAC™ Impax™ Lap

  • 5/16" AF Stainless capped hex washer head
  • #1 self-drill point
  • EPDM washer
  • Drilling capacity: .030-.095"
  • Available lengths: 7/8"
Product Data Sheet | PDF

ZAC® Impax™ zinc alloy capped fasteners

#12-14 ZAC® Impax™ SD3

  • 3/8" or 5/16" AF Zinc alloy capped hex washer head
  • #3 self-drill point
  • EPDM washer
  • Drilling capacity: .035-.210"
  • Available lengths 3/8" CHWH: 1", 1-1/4", 1-1/2", 2", 2-1/2", 3"
  • Available lengths 5/16" CHWH: 1", 1-1/4", 1-1/2", 2"
Product Data Sheet (3/8") | PDF
Product Data Sheet (5/16") | PDF

1/4-14 ZAC® Impax™ Lap

  • 3/8" or 5/16" AF Zinc alloy capped hex washer head
  • #1 self-drill point
  • EPDM washer
  • Drilling capacity: .030-.095"
  • Available lengths: 7/8"
Product Data Sheet (3/8") | PDF
Product Data Sjeet (5/16) | PDF

1/4-14 ZAC® Impax™ SD2 & SD3

  • SD2: 3/8" AF Zinc alloy capped hex washer head
  • SD3: 5/16" AF Zinc alloy capped hex washer head
  • #2 or #3 self-drill point
  • EPDM washer
  • Drilling capacity SD2: .050-.150"
  • Drilling capacity SD3: .050-.210"
  • Available lengths SD2: 1-1/4", 1-1/2"
  • Available lengths SD3: 1-1/4"
Product Data Sheet - 1/4-14 SD2 (3/8") | PDF
Product Data Sheet - 1/4-14 SD3 (5/16") | PDF

#12-24 ZAC® Impax™ SD4.5 & SD5

  • 3/8" AF Zinc alloy capped hex washer head
  • #4.5 or #5 self-drill point
  • EPDM washer
  • Drilling capacity SD4.5: .075-.375"
  • Drilling capacity SD5: .075-.500"
  • Available lengths SD4.5: 1-1/4"
  • Available lengths SD5: 1-1/4", 1-1/2"
Product Data Sheet | PDF

1/4-14 ZAC® Type 17-AB

  • 3/8" AF Zinc alloy capped hex washer head
  • Type 17-AB milled point
  • EPDM washer
  • Drilling capacity: .018-.030"
  • Available lengths: 1", 1-1/2", 2", 2-1/2"
Product Data Sheet | PDF

#17 ZAC® Type AB

Strip-out Repair
  • 3/8" AF Zinc alloy capped hex washer head
  • Type AB
  • EPDM washer
  • Repair fastener for stripped out #14 Type A or 1/4" AB
  • Available lengths: 1", 1-1/2"
Product Data Sheet | PDF
Support your next roofing or cladding project with the strength and mastery of ZAC® and MAC  screws. All SFS drill screws undergo strict testing to ensure uncompromising performance, backed with the SFS long life fastener limited warranty. Our superior standards and forward-thinking engineering are why builders the world over prefer SFS. 

Order ZAC® or MAC roofing screws by calling 1-800-234-4533. Our team is ready to assist and answer all roofing questions! 
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