EFC International
EFC International
1940 Craigshire St. Louis,
MO 63146-4008
Phone: 1 314.434.28881
Contact: www.efc-intl.com/contact
Website: www.efc-intl.com
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Dual Spaced Thread fasteners, or DST®, allow increased thread engagement in softer thermoplastics with their high thread height and wide thread spacing. This also increases resistance to pull-out and improves product performance.

They are available in sizes ranging from #2 to 5/16 (M2.50 to M8.0), in pan, hex, flat, oval, and hex washer head styles, with point styles available of blunt, gimlet or pilot.
Dual Spaced Thread (DST®) Fasteners
Unit of Measure
1 

Item #

Item Name

High Thread Diameter (HO)

Low Thread Diameter (LO)

Thread Pitch Size (P)

E50010570001 N/A 2 Millimeter (mm) Reference Minimum Diameter (mO) Dual Spaced Thread (DST®) Fastener N/A 3.43 to 3.68 mm N/A 2.74 mm N/A 1.34 mm
E50010570002 N/A 2.3 Millimeter (mm) Reference Minimum Diameter (mO) Dual Spaced Thread (DST®) Fastener N/A 3.76 to 4.01 mm N/A 3.3 mm N/A 1.34 mm
E50010570003 N/A 2.4 Millimeter (mm) Reference Minimum Diameter (mO) Dual Spaced Thread (DST®) Fastener N/A 4.06 to 4.32 mm N/A 3.3 mm N/A 1.41 mm
E50010570004 N/A 2.6 Millimeter (mm) Reference Minimum Diameter (mO) Dual Spaced Thread (DST®) Fastener N/A 4.70 to 4.95 mm N/A 3.68 mm N/A 1.59 mm
E50010570005 N/A 2.9 Millimeter (mm) Reference Minimum Diameter (mO) Dual Spaced Thread (DST®) Fastener N/A 5.03 to 5.33 mm N/A 3.81 mm N/A 1.59 mm
E50010570006 N/A 3.5 Millimeter (mm) Reference Minimum Diameter (mO) Dual Spaced Thread (DST®) Fastener N/A 5.33 to 5.59 mm N/A 4.24 mm N/A 1.59 mm
E50010570007 N/A 3.7 Millimeter (mm) Reference Minimum Diameter (mO) Dual Spaced Thread (DST®) Fastener N/A 5.84 to 6.10 mm N/A 4.83 mm N/A 1.59 mm
E50010570008 N/A 4.2 Millimeter (mm) Reference Minimum Diameter (mO) Dual Spaced Thread (DST®) Fastener N/A 6.35 to 6.60 mm N/A 5.08 mm N/A 1.69 mm
E50010570009 N/A 4.8 Millimeter (mm) Reference Minimum Diameter (mO) Dual Spaced Thread (DST®) Fastener N/A 6.98 to 7.24 mm N/A 5.84 mm N/A 1.59 mm
E50010570010 N/A 5.1 Millimeter (mm) Reference Minimum Diameter (mO) Dual Spaced Thread (DST®) Fastener N/A 7.24 to 7.49 mm N/A 6.1 mm N/A 1.59 mm
E50010570011 N/A 5.3 Millimeter (mm) Reference Minimum Diameter (mO) Dual Spaced Thread (DST®) Fastener N/A 7.80 to 6.35 mm N/A 6.35 mm N/A 1.81 mm
E50010570012 N/A 0.073 Inch (in) Reference Minimum Diameter (mO) Dual Spaced Thread (DST®) Fastener N/A 0.119 to 0.125 in N/A 0.1 in N/A 20 mm
E50010570013 N/A 0.08 Inch (in) Reference Minimum Diameter (mO) Dual Spaced Thread (DST®) Fastener N/A 0.135 to 0.145 in N/A 0.108 in N/A 19 mm
E50010570014 N/A 0.09 Inch (in) Reference Minimum Diameter (mO) Dual Spaced Thread (DST®) Fastener N/A 0.148 to 0.158 in N/A 0.13 in N/A 19 mm
E50010570015 N/A 0.095 Inch (in) Reference Minimum Diameter (mO) Dual Spaced Thread (DST®) Fastener N/A 0.160 to 0.170 in N/A 0.13 in N/A 18 mm
E50010570016 N/A 0.105 Inch (in) Reference Minimum Diameter (mO) Dual Spaced Thread (DST®) Fastener N/A 0.185 to 0.195 in N/A 0.145 in N/A 16 mm
E50010570017 N/A 0.125 Inch (in) Reference Minimum Diameter (mO) Dual Spaced Thread (DST®) Fastener N/A 0.210 to 0.220 in N/A 0.167 in N/A 16 mm
E50010570018 N/A 0.132 Inch (in) Reference Minimum Diameter (mO) Dual Spaced Thread (DST®) Fastener N/A 0.220 to 0.230 in N/A 0.18 in N/A 16 mm
E50010570019 N/A 0.165 Inch (in) Reference Minimum Diameter (mO) Dual Spaced Thread (DST®) Fastener N/A 0.250 to 0.260 in N/A 0.2 in N/A 15 mm
E50010570020 N/A 0.188 Inch (in) Reference Minimum Diameter (mO) Dual Spaced Thread (DST®) Fastener N/A 0.275 to 0.285 in N/A 0.23 in N/A 16 mm
E50010570021 N/A 0.208 Inch (in) Reference Minimum Diameter (mO) Dual Spaced Thread (DST®) Fastener N/A 0.307 to 0.317 in N/A 0.25 in N/A 14 mm
Unit of Measure
1