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SPIROL’s Series 28 Long Headed Inserts are designed for straight holes with a 1° maximum (included) draft angle and are typically installed with heat or ultrasonic vibration. The Series 28 Long Inserts are similar to the Series 27 Long Inserts with the addition of a head for increased bearing area. The Series 28 Long Headed Inserts have the same body style as the standard Series 30 Long Headed Inserts with a reduced center knurl diameter for plastic assemblies where the boss diameter is less than 2x the body diameter of the Insert. The Series 28 also comes in a Short version to reduce costs and installation time for applications requiring less demanding torque and/or pull-out resistance. The SPIROL’s Series 28 Headed Inserts are available to order in inch threads ranging in size from 2-56 up to 5/16-18.

If you would like assistance in selecting the most appropriate Insert for your application, please contact SPIROL for complimentary technical support.

Unit of Measure

Package Type

 N/A Each

Supply Status

 N/A Not Stocked

Units Per Package

 N/A 1

Thread Size

 N/A 1/4-20

Overknurl Ø (A Ref.)

 N/A .335 in

Head Ø (H)

 N/A .372 in

Head Thickness (T)

 N/A .050 in

Length (L)

 N/A .500 in

Pilot Ø (P)

 N/A .312 in

Rec. Hole Ø

 N/A .315 in

Rec. Hole Ø Tolerance

 N/A +.003/-.000 in

Material Type

 N/A Brass

Material Grade

 N/A ASTM B16
UNS C36000
EN 12164 CW603N CuZn36Pb3

Finish

 N/A Plain

Weight Per Piece

 N/A 0.0031478 kg0.0069396 lb

Order Processing Note

 N/A Orders typically ship in 2-3 business days. Orders received after 3pm EST will be processed on the next business day.