Sub frame fastening screws 


Improve efficiency and long-term hold with premium sub frame fasteners from SFS


Made from high-grade steel, our sub frame screws deliver accelerated implementation and lasting corrosion resistance.   

1/4-14 SD2 Bi-Met 300®

For light and medium gauge metal connections, curtain wall and building envelope attachment or dissimilar metal connections
Listed on Intertek Evaluation Report CCRR-0387
  • 304 stainless (bi-met) with carbon drill point
  • Drill capacity: 0.105" (2.7 mm) max
  • Diameter: 1/4" with 14 threads per inch
  • Head: 3/8" AF hex washer head
Product data sheet | PDF
Intertek CCRR-0387 Report | PDF

1/4-20 SD4 Bi-Met 300®

For heavy gauge metal connections, curtain wall and building envelope attachment or dissimilar metal connections
Listed on Intertek Evaluation Report CCRR-0387
  • 304 stainless (bi-met) with carbon drill point
  • Drill capacity: 0.312" (7.9 mm) max
  • Diameter: 1/4" with 20 threads per inch
  • Head: 3/8" AF hex washer head
Product data sheet | PDF
Intertek CCRR-0387 Report | PDF

1/4-20 SD5 Bi-Met 300®

For heavy gauge metal connections, curtain wall and building envelope attachment or dissimilar metal connections
Listed on Intertek Evaluation Report CCRR-0387
  • 304 stainless (bi-met) with carbon drill point
  • Drill capacity: 0.500" (12.7 mm) max
  • Diameter: 1/4" with 20 threads per inch
  • Head: 3/8" AF hex washer head
Product Data Sheet | PDF
Intertek CCRR-0387 Report | PDF

SDA5 Full 316 SS Self-Driller Sub-Construction Fastener

For NVELOPE bracket to aluminum
  • Available in 316 stainless steel for increased lifetime with no fastener inspection
  • Drill capacity: 0.197" (5 mm) max
  • Diameter: #12 (5.5 mm) with 14 threads per inch
  • Head: HWH 5/16" (7.8 mm) AF with SR2 Internal Drive
Product Data Sheet | PDF
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SX3 Stainless Self-drill

  • 304 stainless (bi-met) with carbon drill point
  • Drill capacity: .035"–.098" (.88–2.5 mm)
  • For max build up to .787" (20 mm)
  • Diameter: #14 with 11 threads per inch
  • Head: 5/16" AF hex washer head
  • Available with 5/8" stainless bond seal washer
Product Data Sheet | PDF

SX5 Stainless Self-Drill

Ideal for medium thickness metal to metal
  • 304 stainless (bi-met ) with carbon drill point
  • Drill capacity: .060"–.157" (1.5–4 mm)
  • Diameter: #12 with 11 threads per inch
  • Head: 5/16" AF hex washer head
  • Available with 5/8" stainless bond seal washer
Product Data Sheet | PDF

SX14 Stainless Self-Drill

Ideal for heavy-duty metal to metal
  • 304 stainless (bi-met) with carbon drill point
  • Drill capacity: .157"–.550" (4–14 mm)
  • For max build up to 2.283" (58 mm)
  • Diameter: #12 with 14 threads per inch
  • Head: 5/16" AF hex washer head
  • Available with 5/8" stainless bond seal washer
SX14 Hex Bi-Met 300 Data Shee.pdf
Maximize your sub frame installation results with superior fasteners. Call us at 1-610-790-2629 to place your order.  
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