Technical Specification Confirmation
PROCUREMENT & SUPPLY DECISION RECORD
Ref: ACG-SPEC-MQEIXGUO  ·  Generated: 15 Jun 2026
ACG AgaCanGroup
sales@agacaninvestment.com
agacangroup.com
Dormer HSS Drill Bit, 20.5mm Head, 3 Flute(s), 90°, 1 Piece(s)
Dormer
Dormer HSS Drill Bit, 20.5mm Head, 3 Flute(s), 90°, 1 Piece(s)
Part No.
G57020.5
Procurement Intelligence
This is a Dormer HSS countersink drill bit from the general-purpose HSS tooling line, designed for creating 90° conical recesses in metal workpieces for countersunk fasteners. Critical verification: confirm the 10mm shank diameter compatibility with your machine spindle or chuck collet capacity before procurement.
Countersinking fastener holes metals
Before ordering — verify:
☐ Shank diameter compatibility
☐ Single piece quantity
☐ HSS material coolant requirements
Technical Specifications
Drill Bit TypeCountersink
Head Diameter20.5mm
Countersink Angle90°
Number Of Flutes3
MaterialHSS
Overall Length63 mm
Shank Diameter10 mm
Number of Pieces1
ACG Industrial & Infrastructure Solutions
Kampala, Uganda  ·  Malatya, Turkey
http://agacangroup.com/product/mechanical/power-tools-soldering-welding/drill-bits-parts/countersinks/dormer-hss-drill-bit-20-5mm-head-3-flute-s-90-1-piece-s?mal=66275af712f5f0d90d9b2034
This document confirms the above specification is available in the ACG Industrial catalogue. Pricing and availability on request. Forward to your procurement team to initiate an RFQ.