Letterlok 3000 (Return Fastener)


The LETTERLOK 3000 is designed to fasten the open end of the channel letter returns.  This versatile tool eliminates drilling and pop riveting open letter returns and letter centers. It can produce a UL recognized fastener in just two pieces of aluminum.


  • Air over oil powered clinching machine
  • Features a one-piece steel frame with a 3 1/4” or 4 1/2” throat
  • Nearly maintenance free
  • Supplied with a tooling set for 0.040” aluminum
  • Comes complete with a spring balancer for mounting to an optional mobile cart or customer supplied fixture
  • Fasten applications in any area where a 3/8” air line and 75lbs of air pressure are available
  • Only required to unpack and attach a 3/8” airline
  • Portable machine

LL3000 Mobile Cart

Perfectly balanced to effectively carry the LETTERLOK 3000 return fastener. The optional mobile cart for the LETTERLOK 3000 return fastener is an all-steel welded cart designed to support the portable tool for easy locating and transportation in any environment.

Features include:

  • 3” diameter locking casters
  • Collapsible design for easy shipping and storage
  • Mounting for power unit
  • Hooks for machine and hydraulic hoses

Features & Options

Press Design Single steel “C” frame
Features Air over oil intensifier.
Single shot auto return.
Stroke 1/4”
Throat 3 1/4” or 4 1/2″
Work Height Not applicable
Upper Tooling Fast change punch.
Replaceable punch stripper.
Lower Tooling MDWA insert style.
Adjustable to suit material thickness.
Capacity MEDIUM DUTY (0.18ӯ PUNCH)
Aluminum MAX: Combined thickness of 0.125”
MIN: Two ply 0.024”
Cycle speed 30 – 40 CPM (standard speed)
Air Requirements 65 psi (min) 85 psi (max)
75 psi (recommended)
Approx. 0.8 cu ft free air per cycle.
(5 HP @ 40 clinches per minute)
Dimensions Width 2-1/4″ (overall)
Length 12 1/8″ (overall)
Height 8 1/4″ (overall)
Weight 15 lbs Workhead
45 lbs Booster
Options 7 ft tall mobile cart with 2 1/2 ft arm

Typical Joint Strengths (Aluminum)


Material Thickness
Punch side/ Die side
0.090” to 0.063” 240 95
0.080” to 0.080” 265 90
0.063” to 0.063” 240 72
0.063” to 0.040”  270 50
0.040” to 0.040”  175 60



Click here to download brochure: Letterlok 3000

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