Gilson CDA-231, 3in Asphalt Core Drill Bit (Closed-Head)

Nominal Bit Size, OD:
3in (76.2mm)
Mounting Connection:

Price $153.98
Estimated delivery in 4-7 days after ordering
* Estimate is for US customers only.
* Shipping and Import Duties are calculated at checkout.

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Gilson Asphalt Diamond Coring Bits

CDA-231 3in Asphalt Core Drill Bit (Closed-Head)is for use with electric or gasoline-powered Core Drills. Coring Bits obtain drilled asphalt cores for evaluation and testing. The core bit is a one-piece unit with seamless construction that attaches directly to the drilling machine; it works best for light to medium-duty applications. Diamond Coring Bits are designed for wet-use with solid performance in obtaining samples. They are fast-cutting when used as recommended. The bit is 14in (356mm) long and cuts cores up to 13in (330mm) in length. The coring bit can be refurbished when it becomes worn. Final core diameter is approximately 0.25in (6.4mm) smaller than nominal outside diameter.


  • Designed for fast-cutting based on design application
  • Easy connection to drilling machine
  • Meets ASTM and AASHTO standards

Included Items:

3in Asphalt Core Drill Bit (Closed-Head)


  • Application: Asphalt
  • Nominal Bit Size, OD: 3in (76.2mm)
  • Mounting Connection: Closed-Head
  • Estimated Shipping Weight: 10.0lb (4.54kg)

Meets Standard(s):

  • AASHTO T 24M/T 24
  • ASTM C42/42M
3in Asphalt Core Drill Bit (Closed-Head)

Gilson CDA-231, 3in Asphalt Core Drill Bit (Closed-Head)