Nuts: Chouinard

Crack'N-Ups

↑ Set 083-087: Chouinard Crack'N–Ups; #2–#6

Made in USA [1976].
# 1 was too thin and so it was never mass marketed.

↑ 083: Chouinard Crack'N–Up; #2

Made in USA [1976].
Size: 1 mm.
Weight: 9 g.
Alloy steel.
Stamped with the Chouinard 〈C〉 logo. "2," and "USA" on concave side of the shaft.

↑ 084: Chouinard Crack'N–Up; #3

Made in USA [1976].
Size: 1.5 mm.
Weight: 14 g.
Alloy steel.
Stamped with the Chouinard 〈C〉 logo. "3," and "USA" on concave side of the shaft.

↑ 085: Chouinard Crack'N–Up; #4

Made in USA [1976].
Size: 2.4 mm.
Weight: 20 g.
Alloy steel.
Stamped with the Chouinard 〈C〉 logo. "4," and "USA" on concave side of the shaft.

↑ 086: Chouinard Crack'N–Up; #5

Made in USA [1976].
Size: 3.1 mm.
Weight: 27 g.
Alloy steel.
Stamped with the Chouinard 〈C〉 logo. "5," and "USA" on concave side of the shaft.

↑ 087: Chouinard Crack'N–Up; #6

Made in USA [1976].
Size: 4 mm.
Weight: 35 g.
Alloy steel.
Stamped with the Chouinard 〈C〉 logo. "6," and "USA" on concave side of the shaft.

Wired Stoppers

↑ Set 272-277: Chouinard Wired Stoppers

Made in USA [ca. 1976].
#1–#6

↑ 272: Chouinard Wired Stopper

Made in USA [ca. 1976].
#1: 3, 9 mm.
Single taper.

↑ 273: Chouinard Wired Stopper

Made in USA [1974].
#2: 5, 11 mm.
Single taper.

↑ 274: Chouinard Wired Stopper

Made in USA [1974].
#3: 6, 13 mm.
Double taper.

↑ 275: Chouinard Wired Stopper

Made in USA [ca. 1976].
#4: 9, 16 mm.
Double taper. Home wired.

↑ 276: Chouinard Wired Stopper

Made in USA [ca. 1976].
#5: 12, 20 mm.
Double taper. Home wired.

↑ 277: Chouinard Wired Stopper

Made in USA [ca. 1976].
#6: 16, 26 mm.
Double taper.

↑ Set 327-331: Chouinard Wired Stopper

Made in USA [1980s].
#8–#12
Chouinard introduced curved stoppers (generation 4) in 1981.

↑ 327: Chouinard Wired Stopper

Made in USA [1980s].
#8: 17, 25 mm.
Chouinard introduced curved stoppers (generation 4) in 1981.

↑ 328: Chouinard Wired Stopper

Made in USA [1980s].
#9: 17, 26 mm.
Chouinard introduced curved stoppers (generation 4) in 1981.

↑ 329: Chouinard Wired Stopper

Made in USA [1980s].
#10: 20, 27 mm.
Chouinard introduced curved stoppers (generation 4) in 1981.

↑ 330: Chouinard Wired Stopper

Made in USA [1980s].
#11: 23, 31 mm.
Chouinard introduced curved stoppers (generation 4) in 1981.

↑ 331: Chouinard Wired Stopper

Made in USA [1980s].
#12: 27, 34 mm.
Chouinard introduced curved stoppers (generation 4) in 1981.

Stoppers

↑ 149: Chouinard Stopper

Made in USA [1980s].
#4: 9, 16 mm.
First generation.

↑ 671: Chouinard Stopper

Made in USA [1980s].
#4: 9, 14 mm.
Second generation.

↑ 150: Chouinard Stopper

Made in USA [1980s].
#5: 12, 20 mm.
First generation.

↑ 151: Chouinard Stopper

Made in USA [1980s].
#5½: 14, 24 mm.
First generation.

↑ 317: Chouinard Stopper

Made in USA [1980s].
#6: 16, 26 mm.
First generation.

↑ 152: Chouinard Stopper

Made in USA [1980s].
#6½: 18, 29 mm.
Second generation.

↑ 153: Chouinard Stopper

Made in USA [1980s].
#7: 21, 32 mm.
First generation.

↑ 318: Chouinard Stopper

Made in USA [1980s].
#8: 28, 39 mm.
Second generation.

↑ Set 063-065: Chouinard Stoppers

Made in USA [1980s].
#9–#11
Chouinard introduced curved stoppers (generation 4) in 1981.

↑ 063: Chouinard Stopper

Made in USA [1980s].
9: 16.54, 27 mm.
Chouinard introduced curved stoppers (generation 4) in 1981.

↑ 064: Chouinard Stopper

Made in USA [1980s].
10: 20, 30 mm.
Chouinard introduced curved stoppers (generation 4) in 1981.

↑ 065: Chouinard Stopper

Made in USA [1980s].
11: 22, 32 mm.
Chouinard introduced curved stoppers (generation 4) in 1981.

Wired Hexentrics

↑ Set 278-280: Chouinard Wired Hexentrics

Made in USA [ca. 1976].
#1–#3

↑ 278: Chouinard Wired Hexentric

Made in USA [ca. 1976].
#1: 11, 11, 16 mm.

↑ 279: Chouinard Wired Hexentric

Made in USA [ca. 1976].
#2: 13, 14, 20 mm.

↑ 280: Chouinard Wired Hexentric

Made in USA [ca. 1976].
#3: 15.5, 16, 24.5 mm.

Hexentrics

↑ Set 052-059: Chouinard Hexentrics

Made in USA [1980s].
#4–#11

↑ 146: Chouinard Hexentric

Made in USA [1980s].
#1: 11, 11, 16 mm.

↑ 147: Chouinard Hexentric

Made in USA [1980s].
#3: 15.5, 16, 24.5 mm.

Fourth Generation

In 1980 Chouinard changed the wall thickness on their #7 through #11 hexentrics and eliminated the drilled lightening holes, resulting in a stronger chock for essentially the same weight. The sling holes were enlarged so that the recommended sling sizes would fit more easily. The non-functional basal groove found on the earlier generation disappeared, indicating that the extrusions used new molds.

↑ Set 052-059: Chouinard Hexentrics

Made in USA [1980s].
#4–#11

↑ 052: Chouinard Hexentric

Made in USA [1980s].
#4: 20, 21.5, 29 mm.

↑ 053: Chouinard Hexentric

Made in USA [1980s].
#5: 23.5, 26, 34 mm.

↑ 054: Chouinard Hexentric

Made in USA [1980s].
#6: 26.5, 29, 40 mm.

↑ 055: Chouinard Hexentric

Made in USA [1980s].
#7: 32.5, 35, 47.5 mm.

↑ 056: Chouinard Hexentric; #8

Made in USA [1980s].
Size: 39x43x56 mm.
Weight: 59 g.
Third Generation.
Extruded 6061–T6 aluminum. alloy.
Stamped with "HEXCENTRIC, " the Chouinard 〈C〉USA logo, and "8" on the large upper face.

↑ 057: Chouinard Hexentric

Made in USA [1980s].
#9: 46, 50, 65 mm.

↑ 058: Chouinard Hexentric

Made in USA [1980s].
#10: 54, 59, 77 mm.

↑ 059: Chouinard Hexentric

Made in USA [1980s].
#11: 65, 70, 88 mm.

Drilled Hexentrics
(Third Generation)

Factory Drilled

The 1976 Chouinard catalog says that their #8 through #11 Hexentrics were drilled to reduce weight. I have several drilled #7 hexentrics as well. Presumably these came out soon after the others, perhaps in 1977. In 1980 Chouinard changed the wall thickness on their #7 through #11 hexentrics and eliminated the holes, resulting in a stronger chock for essentially the same weight.

All of these have the basal groove found on the smaller second-generation Hexentrics. Sizes #1 through #6 remained unchanged.

↑ Set 148, 756-758, 323: Chouinard Drilled Hexentrics; #7–#11

Made in USA [1976–1979].
Second Generation.
Factory drilled to reduce weight.

↑ 148: Chouinard Drilled Hexentric; #7

Made in USA [1974–1979].
Size: 33x36x47 mm.
Weight: 45 g.
Second Generation.
Factory drilled to reduce weight.
Extruded 6061–T6 aluminum. alloy.
Top is stamped with "HEXENTRIC," the USA–Chouinard 〈C〉 logo, and "7.".
From Mike Gerbman, 2025.

↑ 756: Chouinard Drilled Hexentric; #8

Made in USA [1976–1979].
Size: 39x42x55 mm.
Second Generation.
Factory drilled to reduce weight.
Extruded 6061–T6 aluminum. alloy.
Top is stamped with "HEXENTRIC," the USA–Chouinard 〈C〉 logo, and "8.".
From Mike Gerbman, 2025.

↑ 761: Chouinard Drilled Hexentric; #8

Made in USA [1976–1979].
Size: 39x42x55 mm.
Second generation.
Extruded 6061–T6 aluminum. alloy.
No markings.
Probably home–drilled. Mike had several Hexcentrics drilled to reduce weight, carefully matching the commercial hole pattern.
From Mike Gerbman, 2025.

↑ 761: Chouinard Drilled Hexentric; #8

Made in USA [1976–1979].
Size: 47x51x66 mm.
Second Generation.
Factory drilled to reduce weight.
Extruded 6061–T6 aluminum. alloy.
Top is stamped with "HEXENTRIC," the Chouinard USA〈C〉 logo, and "9.".
From Mike Gerbman, 2025.

↑ 758: Chouinard Drilled Hexentric; #10

Made in USA [1976–1979].
Size: 55x60x77 mm.
Second Generation.
Factory drilled to reduce weight.
Extruded 6061–T6 aluminum. alloy.
Top is stamped with "HEXENTRIC," the Chouinard 〈C〉USA logo, and "10.".
From Mike Gerbman, 2025.

↑ 323: Chouinard Drilled Hexentric; #11

Made in USA [1974–1979].
Size: 65x70x88 mm.
Second Generation.
Factory drilled to reduce weight.
Extruded 6061–T6 aluminum. alloy.
Top is stamped with "HEXENTRIC," the Chouinard 〈C〉USA logo, and "11.".
From Mike Gerbman, 2025.

Home Drilled

Mike Gerbman drilled several Hexcentrics to reduce weight. He used factory-drilled Hexentrics as patterns and carefully matched the commercial hole pattern. I find it difficult to confidently separate the factory-drilled hexentrics from the home-drilled ones. I found that the factory-drilled hexentrics were deburred with a wire wheel and this left tell-tale marks inside the hexentic, while Mike's do not have these marks.

All of these have the basal groove found on the smaller second-generation Hexentrics.

↑ Set 759, 760, 762, 763: Chouinard Home–Drilled Hexentrics; #7–#9, #11

Made in USA [1976–1979].
Second Generation.
Extruded 6061–T6 aluminum. alloy.
Probably home–drilled. Mike had several Hexcentrics drilled to reduce weight, carefully matching the commercial hole pattern.

759: Chouinard Home–Drilled Hexentric; #7

↑ 759: Chouinard Home–Drilled Hexentric; #7

Made in USA [1976–1979].
Size: 33x36x47 mm.
Weight: 45 g.
Second generation.
Extruded 6061–T6 aluminum. alloy.
Stamped with "HEXCENTRIC, " the Chouinard 〈C〉USA logo, and "8" on the large upper face.
Probably home–drilled. Mike had several Hexcentrics drilled to reduce weight, carefully matching the commercial hole pattern.
From Mike Gerbman, 2025.

760: Chouinard Home–Drilled Hexentric; #8

↑ 760: Chouinard Home–Drilled Hexentric; #8

Made in USA [1976–1979].
Size: 39x42x55 mm.
Second generation.
Extruded 6061–T6 aluminum. alloy.
Stamped with "HEXCENTRIC, " the Chouinard 〈C〉USA logo, and "7" on the small upper face.
Probably home–drilled. Mike had several Hexcentrics drilled to reduce weight, carefully matching the commercial hole pattern.
From Mike Gerbman, 2025.

811: Chouinard Home–Drilled Hexentric; #8

↑ 811: Chouinard Home–Drilled Hexentric; #8

Made in USA [1976–1979].
Size: 39x42x55 mm.
Second generation.
Extruded 6061–T6 aluminum. alloy.
No markings.
Probably home–drilled. Mike had several Hexcentrics drilled to reduce weight, carefully matching the commercial hole pattern.
From Mike Gerbman, 2025.

762: Chouinard Home–Drilled Hexentric; #9

↑ 762: Chouinard Home–Drilled Hexentric; #9

Made in USA [1976–1979].
Size: 47x51x66 mm.
Second generation.
Extruded 6061–T6 aluminum. alloy.
No markings.
Probably home–drilled. Mike had several Hexcentrics drilled to reduce weight, carefully matching the commercial hole pattern.
From Mike Gerbman, 2025.

763: Chouinard Home–Drilled Hexentric; #11

↑ 763: Chouinard Home–Drilled Hexentric; #11

Made in USA [1974–1979].
Size: 65x71x90 mm.
Second Generation.
Factory drilled to reduce weight.
Extruded 6061–T6 aluminum. alloy.
No markings.
Probably home–drilled. Mike had several Hexcentrics drilled to reduce weight, carefully matching the commercial hole pattern.

Tube Chocks

Chouinard's Tube Chocks addressed the need for placing clean protection in wide cracks. They offereded a significant weight savins over what equivalent-sized hexes could have provided.

Tube CHock Data

First Generation (ca. 1973)

↑ 031: Chouinard Tube Chock; #4

Made in USA [ca. 1973].
Size: 100x63.5 mm.
Weight: 152 g.
First generation.
6061–T6 2½" o.d. aluminum alloy tube.
Stamped with the Chouinard 〈C〉 logo and "4" on one side (both rotated CCW 90°).

↑ 626: Chouinard Tube Chock; #4½

Made in USA [ca. 1973].
Size: 115x63.5 mm.
Weight: 170 g.
First generation.
6061–T6 2½" o.d. aluminum alloy tube.
Stamped with the Chouinard 〈C〉USA logo and "4½" on one side.

↑ 791: Chouinard Tube Chock; #5½

Made in USA [ca. 1973].
Size: 139.2x63.5 mm.
Weight: 212 g.
First generation.
6061–T6 2½" o.d. aluminum alloy tube.
Stamped with the Chouinard USA〈C〉 logo and "5.5" on one side near the top.
From Mike Gerbman, 2025.

↑ 627: Chouinard Tube Chock; #5½

Made in USA [ca. 1973].
Size: 140x63.5 mm.
Weight: 208 g.
First generation.
6061–T6 2½" o.d. aluminum alloy tube.
Stamped with the Chouinard 〈C〉USA logo and "5½" on one side.

↑ 627: Chouinard Tube Chock; #5½

Made in USA [ca. 1973].
Size: 140x63.5 mm.
Weight: 208 g.
First generation.
6061–T6 2½" o.d. aluminum alloy tube.
Stamped with the Chouinard 〈C〉USA logo and "5½" on one side.

↑ 809: Chouinard Tube Chock; #6

Made in USA [ca. 1973].
Size: 153.3 mm.
Weight: 246 g.
First generation.
6061–T6 2½" o.d. aluminum alloy tube.
Stamped with a the Chouinard 〈C〉 logo (rotated CCW 90°) and "6" on one side.
Stamped with "8" on top near each end (probably by previous owner).