Copperhead Climbing Nuts were originally developed as chocks for clean climbers, which is why I included them here. Nowadays they are primarily used as bashies for aid climbing on harder nail-ups where they are artfully pounded into thin seams to provide marginal bodyweight support. These placements cannot be trusted to hold a fall — they rarely will.

Copperhead data tables in my Forrest Mountaineering Ltd. catalogs from 1974 to 1983 list cable sizes of 3/32", 3/32", 1/8", 5/32" and 3/16" for Copperhead sizes #1 through #5, respectively. I have an earlier (undated) Forrest brochure that listed 1/16" for the #1's cable. That version was much weaker, rated at only 480 lbs (2.1 kN) under ideal laboratory conditions. The #1 (either version) and #2 Copperheads should only be trusted for direct aid.

Forrest discontinued making copperheads long ago, but Fish and others continue making them to support the demand of aid climbers. Original Forrest Copperheads are difficult to find and even more difficult to verify, as there are no distinct features that make specific brand identification practical.

↑ 414: Forrest Copperhead Climbing Nut #1–S: 13x4 mm.

• Made in USA [ca. 1967].
• Plated head, short version.

↑ 326: Forrest Copperhead Climbing Nut #3: 18x9 mm.

• Made in USA [ca. 1967].
• Plated head, standard length.

↑ 333: Forrest Copperhead Climbing Nut #3–S: 18x9 mm.

• Made in USA [ca. 1967].
• Bare head, short version. Originally a nut head, now primarily a bashie.

↑ 412: Forrest Copperhead Climbing Nut #4: 22x10 mm.

• Made in USA [ca. 1967].
• Bare head, standard length.

↑ 413: Forrest Copperhead Climbing Nut #4–S: 22x10 mm.

• Made in USA [ca. 1967].
• Plated head, short version.

↑ 014: Forrest Plastic Foxhead #3: 24, 35 mm.

• Made in USA [ca. 1970].
• This was the only size Plastic Foxhead made.

↑ Set 014, 163: Forrest Plastic vs. Aluminum Wired Foxhead #3

• Made in USA [ca. 1970].
• Plastic vs. #3 aluminum wired Foxhead.

↑ 630: Forrest Wired Foxhead #2: 22, 30 mm.

• Made in USA [ca. 1970].
• Triple crimp. Early Forrest logo.

↑ Set 164-165: Forrest Short Wired Foxheads #1–S, #3–S

• Made in USA [ca. 1970].
• Triple crimp. Early Forrest logo.

↑ 164: Forrest Short Wired Foxhead #1–S: 19, 24 mm.

• Made in USA [ca. 1970].
• Triple crimp. Early Forrest logo.

↑ 165: Forrest Short Wired Foxhead #3–S: 24, 35 mm.

• Made in USA [ca. 1970].
• Triple crimp. Early Forrest logo.

↑ Set 294-294: Forrest Titons T3–T5, #6–#9

• Made in USA [ca. 1975].
• Slotted stem Titons.

↑ 122: Forrest Titon T3: 18, 25 mm.

• Made in USA [ca. 1973].
• Stainless steel.

↑ 296: Forrest Titon T4: 22, 31 mm.

• Made in USA [ca. 1975].
• Stainless steel.

↑ 121: Forrest Titon T5: 25, 34 mm.

• Made in USA [ca. 1973].
• Stainless steel.

↑ 120: Forrest Titon #6: 31, 44 mm.

• Made in USA [ca. 1973].
• Anodized.

↑ 297: Forrest Titon #6: 31, 43 mm.

• Made in USA [ca. 1975].
• Anodized.

↑ 118: Forrest Titon #7: 37, 54 mm.

• Made in USA [ca. 1973].

↑ 119: Forrest Titon #7: 37, 54 mm.

• Made in USA [ca. 1973].
• Anodized.

↑ 324: Forrest Titon #8: 50, 70 mm.

• Made in USA [ca. 1973].

↑ 298: Forrest Titon #9: 63, 83 mm.

• Made in USA [ca. 1975].
• Anodized, slotted stem.

↑ 117: Forrest Titon #9: 50, 79 mm.

• Made in USA [1980].
• Two drilled stem holes Smaller than slotted version.

↑ Set 109-116: Forrest Titons #10–#17

• Made in USA [1980].

↑ 109: Forrest Titon #10: 50, 89 mm.

• Made in USA [1980].

↑ 110: Forrest Titon #11: 50, 99 mm.

• Made in USA [1980].

↑ 111: Forrest Titon #12: 50, 114 mm.

• Made in USA [1980].

↑ 112: Forrest Titon #13: 50, 126 mm.

• Made in USA [1980].

↑ 113: Forrest Titon #14: 50, 140 mm.

• Made in USA [1980].

↑ 114: Forrest Titon #15: 50, 152 mm.

• Made in USA [1980].

↑ 115: Forrest Titon #16: 50, 165 mm.

• Made in USA [1980].

↑ 116: Forrest Titon #17: 50, 177 mm.

• Made in USA [1980].