| Name: | Chouinard Big D 1983 |
| Category: | screw lock |
| Locking Type: | manual |
| Locks: | screw |
| Unlock Style: | gate stopped - thread runout |
| Sleeve Rotation: | 360° (unlocked) | 630° (maximum) |
| Shape: | asymmetric D |
| Material: | aluminum |
| Profile: | flat |
| Nose: | notch & pin |
| Nose Guard: | none |
| Rivets: | flat |
| Gate Shield: | none |
| Weight: | 71.7 g |
| Dimensions: | Length: 110.7 mm Width: 65.26 mm Rope Bearing Depth: 9.46 mm Gate Opening: 20.70 mm |
| Strength Ratings: |  2800 KG |
| Other Markings: | Forged: CHOUINARD-USA | 2000 KG |
| Collection Criteria: | ★ Manufacturing, Engineering, or Design |
| Summary: | threaded sleeve blocks the hinge rather than nose |
| Description & Commentary: |