Sub frame fastening screws 


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


Made from high-grade steel, SFS 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" (2.7mm) 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" (7.9mm) 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" (12.7mm) 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" (5mm) max
  • Diameter: #12 (5.5) with 14 threads per inch
  • Head: HWH 5/16" (7.8mm) 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" (.88-2.5mm)
  • For max build up to .787" (20mm)
  • 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" (1.5-4mm)
  • 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" (4-14mm)
  • For max build up to 2.283" (58mm)
  • Diameter: #12 with 14 threads per inch
  • Head: 5/16" AF hex washer head
  • Available with 5/8" stainless bond seal washer
Product Data Sheet | PDF
Maximize your subframe installation results with superior fasteners. Call SFS at 1-610-790-2629 to place your order.  
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