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Hardened tip on forcing screw
Square head forcing screw for use with wrench
Heavy-duty threaded hub design
Opening Size 0 in [Min], 1 5/16 in [Max]  
Throat Depth 15/16 in  
Spindle Diam 7/16 in  
Body Material Forged Alloy Steel  
Finish Black  
Locking Type Thread Locking  
Handle Type Square Head  
Type C-Clamp  
Wt. 0.70 lb  
UPC 662679480011
UNSPSC 27112120
Heavy Duty Service C-Clamps.
  Maxinum        Minimum           Throat Depth          Exterior                   Screw                 Screw Length
  Capacity        Capacity            From Center           Body Width              Diameter            Under Head
   (Inches )          (Inches)        (Inches)                 (Inches)                   (Inches)             (Inches)
    1-3/8"             0"                   1-1/8"                   2-23/32"                   13/32"                2-7/16"
The strongest C-Clamp made Square-head screw has hardened point Screw does not include handle--it must be tightened with a wrench Extra long hub helps prevent springing even under great stress
Item No Maximum Capacity(Inch) Throat Depth Thread Size
Armstrong 78-021 0 Inch( Min ) To 2-3/8"(Max) 1-9/16"

3/4"-10

Body Material Forged Steel Locking Type Thread Locking Handle Type Square Head. Wt. 3.28 lb
Armstrong 78-030 Heavy Duty Pattern C- Clamps.Made in U.S.A.
Our Price: $176.00
Sale Price: $125.00
You save $51.00!
-The strongest C-Clamp made
- Square- head screw has hardened point
- Screw does not include handle it must be tightened with a wrench
- Extra long hub helps prevent springing even under great stress Test & Approvals : FED SPEC. GGG-C-406d
Body Material : Forged Steel
- Locking Type : Thread Locking
- Handle Type: Square Head
Opening Size 5/8" to 3-5/16"
Throat Depth 2 inch
Spindle Diam 7/8"
Thread Per Inch 9   Wt 5.83 lb
Made in U.S.A
The strongest C-Clamp made Square-head screw has hardened point Screw does not include handle--it must be tightened with a wrench Extra long hub helps prevent springing even under great stress .
Item No Opening Size (Inch ) Throat Depth Thread Size
Armstrong 78 -031 0 Inch (Minimum) To 3-5/16" (Max) 2 Inch 7/8" -9
Body Material Forged Steel Locking Type Thread Locking Handle Type Square Head Wt. 5.83 lb Testing and Approvals: FED SPEC. GGG-C-406d
Models with Copper plated screws resist adherence of welding splatter. Heavy service C-Clamps are available for the most demanding applications such as construction and heavy industry. I-beam designe for greater strength and lighter weight. Drop-forged and heat treated frames for greater safety and strength.
Heavy Duty Service C-Clamps.
Features;
- Especially designed for heavy duty service frames are drop-forged and heat-treated for maximum strength and reduced springing.
- Screws are made of special grade steel and are heat-treated for added strength not found in typical case-hardened screws.
- Ideal for the most demanding applications such as construction and heavy industry.
- Square head screw allows tightening with wrench for extra heavy duty clamping requirements.
- Greater anvil surface for gripping larger work pieces and for greater stability.
  Maxinum        Minimum           Throat Depth          Exterior                   Screw                 Screw Length
  Capacity        Capacity            From Center           Body Width              Diameter            Under Head
   (Inches )          (Inches)        (Inches)                 (Inches)                   (Inches)             (Inches)
    4-21/32"             0"                   2-7/8"                   6-1/4"                   27/32"                    7-1/4"
The strongest C-Clamp made Square-head screw has hardened point Screw does not include handle--it must be tightened with a wrench Extra long hub helps prevent springing even under great stress
Item No Opening Size Throat Depth Thread Size ( Spindle Dia )
Armstrong 78-041

0 Inch (Minimum) To 4-5/8" (Max )

2 -7/16 Inch

1" - 8

Body Material Forged Steel Locking Type Thread Locking Handle Type Square Head Wt. 10.10 lb Testing and Approvals: FED SPEC. GGG-C-406d
Models with Copper plated screws resist adherence of welding splatter. Heavy service C-Clamps are available for the most demanding applications such as construction and heavy industry. I-beam designe for greater strength and lighter weight. Drop-forged and heat treated frames for greater safety and strength.
Heavy Duty Service C-Clamps.
Features;
- Especially designed for heavy duty service frames are drop-forged and heat-treated for maximum strength and reduced springing.
- Screws are made of special grade steel and are heat-treated for added strength not found in typical case-hardened screws.
- Ideal for the most demanding applications such as construction and heavy industry.
- Square head screw allows tightening with wrench for extra heavy duty clamping requirements.
- Greater anvil surface for gripping larger work pieces and for greater stability.
  Maxinum        Minimum           Throat Depth          Exterior                   Screw                 Screw Length
  Capacity        Capacity            From Center           Body Width              Diameter            Under Head
   (Inches )          (Inches)        (Inches)                 (Inches)                   (Inches)             (Inches)
    6-1/2"             1-5/32"                   3-1/2"                   7-1/2"                   1-3/32"                    8"
Models with Copper plated screws resist adherence of welding splatter. Heavy service C-Clamps are available for the most demanding applications such as construction and heavy industry. I-beam designe for greater strength and lighter weight. Drop-forged and heat treated frames for greater safety and strength.
Heavy Duty Service C-Clamps.
Features;
- Especially designed for heavy duty service frames are drop-forged and heat-treated for maximum strength and reduced springing.
- Screws are made of special grade steel and are heat-treated for added strength not found in typical case-hardened screws.
- Ideal for the most demanding applications such as construction and heavy industry.
- Square head screw allows tightening with wrench for extra heavy duty clamping requirements.
- Greater anvil surface for gripping larger work pieces and for greater stability.
  Maxinum        Minimum           Throat Depth          Exterior                   Screw                 Screw Length
  Capacity        Capacity            From Center           Body Width              Diameter            Under Head
   (Inches )          (Inches)        (Inches)                 (Inches)                   (Inches)             (Inches)
    6-1/2"             0"                   3-1/2"                   7-1/2"                   1-3/32"                    10"