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Insert(Thread Dia. (After inserted), Unified:1/4-28)

These products are used for reinforcing female threads. These can be used with damaged female threads or soft materials to enable screws/bolts to be tightened.
In general, coil inserts that have been machined into a coil shape are very common, but we also have a wide lineup that includes "self-tapping inserts", "inserts for resin", "insert nuts", "locking inserts", etc., enabling use to suit various environments or materials.
MISUMI enables spec searches and ordering quantities from just 1 piece. Tools are also sold in addition to the inserts themselves.
Iron, stainless steel, brass, phosphor bronze, Inconel, nitronics
M1.4 to M39 are available as well as imperial sizes
[Search Keywords]
Heli-Sert, E-Sert, Sprue, Female Thread

Search by specifying the lower class category

Days to Ship
  • All
  • Same day
  • 3 Day(s) or Less
  • 4 Day(s) or Less
  • 5 Day(s) or Less
  • 6 Day(s) or Less
  • 7 Day(s) or Less
  • 8 Day(s) or Less
  • 9 Day(s) or Less
  • 10 Day(s) or Less
  • 11 Day(s) or Less
  1. 1
Product Series
Days to Ship
Screw Type
Screw Dia. M (after insertion)(mm)
Thread Dia. (After inserted), Unified(inch)
Length L (after insertion) (D = Thread Dia. M)
Sales Unit

    Sprue (Unify) (UNF)

      Recoil Packet (UNF)

        Recoil-Free (UNF) SUS304

          Stainless Steel E-Sert (Unify) (UNF)


          NIPPON SPREW




          Product Series

          Sprue (Unify) (UNF)【10-100 Pieces Per Package】

          Recoil Packet (UNF)【10 Pieces Per Package】

          Recoil-Free (UNF) SUS304

          Stainless Steel E-Sert (Unify) (UNF)【100 Pieces Per Package】

          Days to Ship 4 Day(s) or more 6 Day(s) or more 6 Day(s) or more 14 Day(s) or more
          ApplicationLight MetalLight MetalLight Metal-
          MaterialStainless Steel (SUS303/304)Stainless Steel (SUS303/304)Stainless Steel (SUS303/304)Stainless Steel (SUS303/304)
          Screw TypeUnified (Fine) ThreadUnified (Fine) ThreadUnified (Fine) ThreadUnified (Fine) Thread
          Screw Dia. M (after insertion)(mm)----
          Thread Dia. (After inserted), Unified(inch)1/4-281/4-281/4-281/4-28
          Length L (after insertion) (D = Thread Dia. M)1D / 1.5D / 2D / 2.5D / 3D1.5D1D / 1.5D / 2D1D / 1.5D / 2D / 2.5D / 3D
          Sales UnitBox, Pkg.Box, Pkg.Low Quantity (Available beginning with 1 pc.)Box, Pkg.


          1. 1

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