Expansion Nuts are vibration-resistant fasteners that provide quick attachment in blind or center-panel locations. These Expansion Nuts have spring legs for self-retaining in rectangular holes. If permanent retention is required, a special locking tab can be provided. Design variations accommodate box or robotics styles. Easy to apply, Expansion Nuts can be used in place of weld-, clinch-, or stake-type fasteners. No masking is required because they will not clog when painted either before or after installation.
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Metal Expansion Nuts

M4.2 Screw Size Metal Expansion Nut
Metal Expansion Nuts

M4.2 x 1.41 Screw Size Metal Expansion Nut
Metal Expansion Nuts

8-18 Screw Size Metal Expansion Nut
Metal Expansion Nuts

M4.2 x 1.69 Screw Size Metal Expansion Nut
Metal Expansion Nuts

M4.2 x 1.69 Screw Size Metal Expansion Nut
Description N/A Expansion Nuts are vibration-resistant fasteners that provide quick attachment in blind or center-panel locations. These Expansion Nuts have spring legs for self-retaining in rectangular holes. If permanent retention is required, a special locking tab can be provided. Design variations accommodate box or robotics styles. Easy to apply, Expansion Nuts can be used in place of weld-, clinch-, or stake-type fasteners. No masking is required because they will not clog when painted either before or after installation.
Weight N/A N/A 4.37 lb N/A N/A 3.85 lb N/A
Panel Thickness N/A 2.3 mm2.8 mm N/A 2.3 mm2.8 mm N/A 1 mm1.5 mm N/A 2.1 mm2.5 mm N/A 2.1 mm2.5 mm
Screw Size N/A M4.2 N/A M4.2 x 1.41 N/A 8-18 N/A M4.2 x 1.69 N/A M4.2 x 1.69
Height N/A 12.30 mm N/A 12.30 mm N/A 7.350 mm N/A 12.40 mm N/A 12.40 mm
Design Variation N/A 1 N/A 3E N/A 3K N/A Dual Lead Thread Impression N/A Dual Lead Thread Impression
Hole Length N/A 11.8 mm N/A 9.1 mm N/A 8.65 mm N/A 8.1 mm N/A 8.1 mm
Hole Width N/A 9.10 mm11.1 mm N/A 11 mm11.2 mm N/A 8.55 mm8.75 mm N/A 10.1 mm N/A 10.1 mm
Original Equipment Manufacturer (OEM) Reference N/A N/A 17997722 N/A N/A 06034833AA N/A
SAP Number N/A N/A 137752000 N/A 137672000 N/A 137675001 N/A 137675003
Features and Benefits N/A Box style expansion nuts reinforce the attachments and provide low-failure risk primarily in sheet metal applications. Tapered robotics expansion nuts are suited to automation in plastic and metals panels. Available in tapped barrel, key-hole, and speed-nut thread impressions, the tapped barrel offers the strongest attachment and is most beneficial in high volume applications.
  • One-piece, self-retaining
  • Convenience and economy of stamped fastener
  • Multiple thread strength and reliability
  • Prevailing torque inherent on screw
  • Screw will not loosen due to vibration, panel set or migration
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