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The Series 29 Long Insert is the longer version of the Series 29 Short Insert resulting in higher torque and pull-out resistance. Designed with a wide center knurl with two smaller knurls and deep undercuts on both ends, the Series 29 Long (and the Series 30 Long – Headed version of the Series 29 Long ) typically provides the highest torque and pull out performance within SPIROL’s Heat/Ultrasonic style Inserts designed for straight holes. This series is symmetrical for ease of orientation, and the generous pilot facilitates installation into the hole. The Series 29 Long is available in inch threads ranging from 2-56 up to 5/16-18.

If you don’t see what you are looking for in our standard offering (including thread size, length, quantity, etc.), please feel free to contact SPIROL directly at or call any one of our global offices for complimentary Application Engineering assistance!

Unit of Measure

Supply Status

N/A Stocked

Units per Box

N/A 1

Thread Size

N/A 2-56

Overknurl Ø (A Ref.)

N/A .143 in

Length (L)

N/A .157 in

Pilot Ø (P)

N/A .123 in

Rec. Hole Ø

N/A .126 in

Rec. Hole Ø Tolerance

N/A +.003/-.000 in

Material Type

N/A Brass

Material Grade

UNS C36000
EN 12164 CW603N CuZn36Pb3


N/A Plain

Weight Per Piece

N/A 0.0001571 kg0.0003464 lb