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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Top Collar Lock Nuts combine reliable self-clinching mounting with a reusable clear nylon thread locking element. All self-clinching fasteners install into a round hole that may be punched or drilled in ductile materials. They provide a permanently attached fastener, which becomes an integral part of the panel or frame and eliminates the problems associated with loose hardware. Self-Clinching fasteners provide added value by speeding initial assembly as well as servicing in the field, keeping costs to a minimum.
Unit of Measure

Specifications

Thread

 N/A Class 2B, MIL- S-7742; (6H ISO metric)

Material

 N/A Carbon Steel

Thread Size

 N/A M4x0.7

Maximum Dimension A

 N/A 7.47 mm

Maximum Dimension D

 N/A 7 mm

Panel Thickness Range

 N/A 1.5 to 1.78 in

Hole Inside Diameter

 N/A 7.5 mm

Maximum Dimension B

 N/A 8.6 mm

Maximum Dimension C

 N/A 4.2 mm

Minimum Center of Hole to Edge of Panel

 N/A 5.6 mm

Use In

 N/A CFH-Materials with Rockwell Hardness of B-70 or less.

Installation Tips

Installation Tips

 N/A
  • Thin Sheets - May be installed in panel thickness of 0.040 to 0.059 (1mm to 1.5mm) if fastener is partially installed in sheet. The knurled collar must be raised above sheet by the difference in thickness from 0.059 (1.5mm)
  • Thick Sheets - If fastener is installed in sheet greater than 0.070 (1.7mm), knurled collar may crack if mating screw is tightened above maximum torque limit
  • Locking Element is Clear Nylon

Features and Benefits

Features and Benefits

 N/A Self-clinching fasteners are pressed into holes in sheet metal by applying a steady squeezing force. This results in the cold-flow of sheet material, which is displaced by the knurl, into the undercut area on the shank of the fastener. Once fully embedded, the knurled area prevents torque-out during tightening of mating part.