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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Roll formed hardened Spirol® Spring Dowels accurately align mating components with respect to each other. They are formed around arbors to assure roundness, have staggered seams to prevent interlocking, and lead-in beveled chamfers ease insertion. Their outer diameter is larger than the diameter of the mounting hole, and their spring action enables them to conform to a drilled or cored hole and be self-retained.
Unit of Measure

Specifications

Brands

 N/A Spirol®

Material

 N/A Steel

Outside Diameter

 N/A 0.260 to 0.270 in

Minimum Single Shear Strength

 N/A 1.00 kN

Wall Thickness

 N/A 0.022 mm

Nominal Dowel Diameter

 N/A 0.250 in

Hole Tolerance

 N/A 0.250 to 0.255 in

Length (L) (Decimal)

 N/A 0.375 in

Finish

 N/A Phosphated Oiled Plain Oiled Zinc plated

Fabrication Process

 N/A Hardened

Material and Hardness

 N/A 1070-1095 Carbon Steel (AISI 1070-1080; DIN 177222 CK67-75; BS 1449 CS70-80) HV: 420 to 545

Features and Benefits

Features and Benefits

 N/A Hole Recommendations:
  • 1/2 the hole tolerance should be used for the fixed location of the dowel, and 1/2 for the mating part
  • Use drills or core pins equal to the nominal diameters to prepare holes
  • Hole tolerances should be utilized to accommodate normal shop practices