AN21
Self-Drill Anchor
GSA Specification FF-S-325
Group III, Type 1
The Self-Drill Anchor is a precision-machined combination anchor-drill of high-grade steel, specially tempered to
insure clean, close-fitting holes and plated to resist rust and corrosion. Eight sharp cutting teeth quickly and
accurately drill into masonry materials without fouling. On being driven down on a tapered steel plug, vertical slots
in the shield insure uniform expansion, giving Self-Drill Anchors extraordinary holding power. At the surface end
of the Self-Drill Anchor are internal threads, precision-machined to receive standard machine bolts or machine
screws. Self-Drill Anchors are permanently secured after expansion... though fixtures may be readily removed
and replaced.
BENEFITS:
• Self-drilling action produces accurate hole size, every time
• Quick easy installation
• Dependable, convenient overhead application
• Eliminates use of carbide bits by drilling its own hole
Installation
A
B
Ultimat Ultimat
Part
Bolt
Outsid
ThreadDepth In
Pullout* Shear*
Number Size
Dia.
Depth Concret
(lbs.) (lbs.)
20A-1Z0 1/4"-2 3/8" 1-3/32" 7/16" 2,713 2,103
20A-1Z0 3/8"-1 9/16" 1-17/32" 9/16" 4,200 4,550
20A-1Z0 1/2"-1 13/16" 2-1/32" 11/16" 7,350 6,800
20A-1Z0 5/8"-1 15/16" 2-15/32" 27/32" 10,250 9,900
1"
13,950 12,350
20A-1Z0 3/4"-1 1-7/32" 3-1/4"
* Ultimate load capacity in 4713 psi 3/4" crushed limestone aggregate concrete. Based on independent testing
laboratory tests.
Safe working loads for single installations under static loading should not exceed 25% of the ultimate load capacity.
1. Drill with anchor until chuck
holder is flush with concrete
surface. Remove anchor.
Clean hole. Tap cuttings from
anchor core.
2. Place expander plug into
drilling end of anchor. Reinsert
anchor into hole. Using impact
only, drive anchor into hole
until chuck holder is flush with
concrete surface.
HAMMER
SHANK
SHANK DRIFT PIN
HEAD
ANCHOR
ANCHOR EJECTOR KEY
Self-Drill Accessory Selection Chart
3. Snap off taper cone. Use
ejector key to remove cone from
chuck holder.
4. Complete installation.
Anchor
Hamme
Anchor Chuck Chuck
Shank
Model
Ejector
Make
Capacit Shank Head
Drift Pin
Key
1/4"
20A-2C0
RED®
747-2
3/8"
20A-2C0
HEAD
or
1/2" 20A-2B020A-2C020A-2E020A-2F0
(Phillips
®
747-30
5/8"
20A-2C0
)
3/4"
20A-2C0
APPROVALS/LISTINGS:
The availability of UL listings, ICBO reports, and city approvals vary by
manufacturer. Specific approval requirements must be stated at order entry.