Columbia MFG, LLC
501 NW 214th Circle
Ridgefield, WA  97103 
(360) 887-2967 - FAX: (360)-887-2269

Forged Steel Extension Links

Material Specifications
Forged steel meeting the requirements of ASTM 668, latest revision; AISI 1040/1045 carbon steel

Quenched and tempered, final hardness 212/248 BHN.

Magnetic particle inspected.

Clevis Bolt
3/4" clevis pinwith cotter pin is standard for all clevis end units.

Optional Clevis Bolt
3/4" x 3 1/2" hex head bolt, 3/4" hex nut and 3/16" x 1 1/4" brass cotter pin is available - designate with suffix BNC for this option.

Bolts shall meet requirement of ASTM1-325, latest revision.

Finish
All steel shall be hot dipped galvanized per ASTM A153, latest revision.

Tolerances
Lengths 36" and less +/_ 3/8"

Lengths over 36", +/- 3/4"
 
Catalog
Number		 Figure
Number		 Dimensions (inches) Ultimate
Strength
lbs		 Weight (lbs)
per 100 PCS
A B C D E F G H
1112 1 12" 1 3/16" 1 3/4" 2"  -  -  - 3/4" 30,000 425
1118 1 18" 1 3/16" 1 3/4" 2"  -  -  - 3/4" 30,000 500
1124 1 24" 1 3/16" 1 3/4" 2"  -  -  - 3/4" 30,000 575
1130 1 30" 1 3/16" 1 3/4" 2"  -  -  - 3/4" 30,000 650
1136 1 36" 1 3/16" 1 3/4" 2"  -  -  - 3/4" 30,000 725
1142 1 42" 1 3/16" 1 3/4" 2"  -  -  - 3/4" 30,000 800
1148 1 48" 1 3/16" 1 3/4" 2"  -  -  - 3/4" 30,000 875
2112 2 12" 1 3/16" 1 3/4" 2"  -  -  - 3/4" 30,000 425
2118 2 18" 1 3/16" 1 3/4" 2"  -  -  - 3/4" 30,000 500
2124 2 24" 1 3/16" 1 3/4" 2"  -  -  - 3/4" 30,000 575
2130 2 30" 1 3/16" 1 3/4" 2"  -  -  - 3/4" 30,000 650
2136 2 36" 1 3/16" 1 3/4" 2"  -  -  - 3/4" 30,000 725
2142 2 42" 1 3/16" 1 3/4" 2"  -  -  - 3/4" 30,000 800
2148 2 48" 1 3/16" 1 3/4" 2"  -  -  - 3/4" 30,000 875
3112 3 12" 1 3/16" 1 3/4" 2" 2" 11/2" 5/8" 3/4" 30,000 340
3118 3 18" 1 3/16" 1 3/4" 2" 2" 11/2" 5/8" 3/4" 30,000 415
3124 3 24" 1 3/16" 1 3/4" 2" 2" 11/2" 5/8" 3/4" 30,000 490
3130 3 30" 1 3/16" 1 3/4" 2" 2" 11/2" 5/8" 3/4" 30,000 565
3136 3 36" 1 3/16" 1 3/4" 2" 2" 11/2" 5/8" 3/4" 30,000 640
3142 3 42" 1 3/16" 1 3/4" 2" 2" 11/2" 5/8" 3/4" 30,000 715
3148 3 48" 1 3/16" 1 3/4" 2" 2" 11/2" 5/8" 3/4" 30,000 790
4112 4 12" 1 3/16" 1 3/4" 2" 2" 11/2" 5/8" 3/4" 30,000 340
4118 4 18" 1 3/16" 1 3/4" 2" 2" 11/2" 5/8" 3/4" 30,000 415
4124 4 24" 1 3/16" 1 3/4" 2" 2" 11/2" 5/8" 3/4" 30,000 490
4130 4 30" 1 3/16" 1 3/4" 2" 2" 11/2" 5/8" 3/4" 30,000 565
4136 4 36" 1 3/16" 1 3/4" 2" 2" 11/2" 5/8" 3/4" 30,000 640
4142 4 42" 1 3/16" 1 3/4" 2" 2" 11/2" 5/8" 3/4" 30,000 715
4148 4 48" 1 3/16" 1 3/4" 2" 2" 11/2" 5/8" 3/4" 30,000 790
                       

Figure 1
Clevis-Clevis
Figure 2
Clevis-Clevis 90º
Figure 3
Clevis-Eye
Figure 4
Clevis-Eye 90º

 

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This page revised 11/24/08