Alumi-Flex^®

Specifications FASTENER MATERIALS 300 series (18-8) stainless steel DIAMETER #10, #12 1/4" DRILL POINT TYPES #3, #4 HEAD STYLES Hex Washer Head (HWH) Undercut Flat Head (PUFH) FINISH Stalgard GB (Galvanic Barrier) coating

Stainless Steel Self-Drilling Screws

Alumi-Flex structural drill screws are 300 series (18-8) stainless steel self-drilling tapping screws. The screw body is entirely stainless steel and can be an excellent solution for fastening to aluminum
when corrosion resistance and galvanic reaction are a primary concern.

 

GENERAL APPLICATIONS AND USES 

• Curtain Walls
• Rainscreen
• Window walls/glazing
• Solar panel systems
• For fastening to aluminum only

 

FEATURES AND BENEFITS  

• Immune to hydrogen assisted stress corrosion cracking (HASCC)
• Higher corrosion resistance compared with carbon steel and 410 series stainless steel fasteners
• Stalgard® GB coating provides improved corrosion resistance as well as enhanced galvanic compatibility in dissimilar metal applications, including those involving aluminum, compared with
  bare stainless fasteners and those with standard zinc plating
• Fasteners coated with Stalgard® GB typically show no base metal corrosion on significant surfaces
  after 500 hours of salt spray exposure in accordance with ASTM B117
• Head marked with a "3" for easy identification (undercut flat head screws do not have a head marking)
  
  

APPROVALS AND LISTINGS

• International Code Council, Evaluation service (ICC-Es), ESR-4374
• Compliant with the International Building Code/Internation Resiential Code: 2021 IBC/IRC, 2018 IBC/IRC, 2015IBC/IRC and 2012 IBC/IRC
• Los Angeles Building Code (LABC) and Los Angeles Residential Code (LARC) Supplement (within ICC-ES report)
• Florida Building Code (FBC) Supplement (within ICC-ES report)
• Tested in accordance with ICC-ES AC491 for us in Aluminum

 

GUIDE SPECIFICATIONS

05 05 23 – Metal Fastenings, 09 22 16.23 – Fasteners. Fasteners shall be Alumi-Flex as supplied by DEWALT, Towson, MD. Fasteners shall be installed with published instructions and the Authority Having Jurisdiction.

 

MATERIAL SPECIFICATIONS

Fastener component	Specification
Fastener	300 Series (18-8) Stainless Steel
Plating/Coating	Stalgard GB coating 500 hour rating in ASTM B117 salt spray test

 

INSTALLATION SPECIFICATIONS

Point Size Selection
Maximum Combined Material Thickness By Point Type

 

 

Drilling and Tapping Capacity in Aluminum
(Maximum Material Thickness)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Maximum Recommended Installation RPM

Diameter	RPM
#10	2500
#12	2500
1/4"	1800

 

Nominal Sheet Metal Sizes (Aluminum)

Gauge	Decimal (in.)
22	0.025
20	0.032
18	0.040
16	0.050
14	0.064
12	0.100

 

Nominal Screw Sizes

Thread Dia.	Decimal (in.)
#10	.190
#12	.216
1/4"	.250

 

Minimum Screw Spacing and Edge Distance in Aluminum 

Screw Diameter: d (in.)	Minimum Spacing: 2.5d (in.)	Minimum Edge Distance: 1.5d (in.)
0.19 (#10)	1/2	5/16
0.216 (#12)	9/16	3/8
0.25 (1/4)	5/8	3/8

 

Installation Instructions

 

Step 1 Select a torque adjustable screwgun that aligns with the recommended installation RPM's of the particular fastener (DeWALT VersaClutch Screwguns are recommended). Adjust the setting on the screwgun so that the tool does not overdrive the fastener.	Step 2 Attach an appropriate sized hex nut driver/ phillips bit to the screwgun. Mount the screw fastener head into the driver.	Step 3 Place the screw fastener against the work surface. While the screw fastener is in a perpendicular position, begin driving the screw fastener into the base material. Note: The ideal speed and pressure will depend on the characteristics of the base material as well as the screw size and point type. A trial installation is suggested to determine the optimal tool setting, speed and pressure for the material and application.	Step 4 Drive the screw fastener until the head of the screw is in contact and snug tight with the work surface and/or the material being fastened.

Download the complete Stainless Steel Self-Drilling Screw Spec Sheet