# Keystone test point

Keystone's colour-keyed through-hole PCB test points: a phosphor bronze wire-form loop on a nylon base, in three styles. The base stands on the board (the XY plane), centred on the origin. The loop is in the XZ plane above it, and the terminal runs down through the board. The terminal is one solid and the base another.

| Style | Catalogue numbers by base colour (red, black, white, orange, yellow, brown, green, blue, grey, purple) |
|---|---|
| miniature | 5000, 5001, 5002, 5003, 5004, 5115, 5116, 5117, 5118, 5119 |
| compact | 5005, 5006, 5007, 5008, 5009, 5120, 5121, 5122, 5123, 5124 |
| multipurpose | 5010, 5011, 5012, 5013, 5014, 5125, 5126, 5127, 5128, 5129 |

## Source

Keystone Electronics catalogue, "(THM) THRU HOLE MOUNT TEST POINTS - COLOR KEYED", page 62. Copy hosted by Chip and Dip, <https://static.chipdip.ru/lib/819/DOC031819997.pdf>. The page gives inches [mm]. The terminal is from its SPECIFICATIONS: "Terminal: thickness x width Phosphor Bronze, Silver Plate", "Base: Nylon 46, UL Rated 94V-0" and "Mtg. Hole".

| Style | Base diameter | Loop inside diameter | Base height | Above the board | Overall length | Terminal | Mounting hole |
|---|---|---|---|---|---|---|---|
| miniature | .100 [2.5] | .050 [1.25] | .120 [3.0] | .180 [4.6] | .300 [7.6] | .010 (.25) x .020 (.51) | .040 (1.0) |
| compact | .125 [3.2] | .070 [1.80] | .120 [3.0] | .220 [5.6] | .350 [8.9] | .015 (.38) x .032 (.81) | .063 (1.6) |
| multipurpose | .125 [3.2] | .070 [1.80] | .120 [3.0] | .320 [8.1] | .445 [11.3] | .015 (.38) x .032 (.81) | .063 (1.6) |

The loop is the terminal's section, thickness x width, bent to the inside diameter, with its top at the height above the board. The overall length runs from the loop's top to the terminal's end below the board.

**Proportion, stated plainly.** The page draws this but doesn't dimension it. Below the loop, the terminal's two ends run down side by side as one post, two thicknesses wide, through the base to the end below the board. The drawn snap-fit splay of the legs under the board isn't modelled. The terminal's room is cut out of the base, so no solids overlap.

**Materials.** The terminal is phosphor bronze, copper C51000, shown silver for the plating. The base is Nylon 46, and pa6 is the nearest nylon in the material list (PA46's density is about 1.18, PA6's 1.14). The base colours are for looks. The page gives no weight.

## Catalogue models

The old catalogue's `TestPoint_Keystone_5005-5009_Compact` maps to the compact style, preset 5005 (red). The entry covers 5005 to 5009, which differ only in colour. Its reference model was measured against the page, and every value is within 0.05:

| | Reference model | Keystone compact |
|---|---|---|
| Base diameter | 3.18 | 3.2 |
| Base height | 3.05 | 3.0 |
| Top above the board | 5.6 | 5.6 |
| End below the board | 3.3 | 3.3 (8.9 - 5.6) |
| Loop width | 2.54 | 2.56 (1.80 + 2 x 0.38) |
| Terminal width | 0.82 | 0.81 |

The family's other entries name no maker. The `TestPoint_Loop_*` entries are bare wire loops without a base, and the `TestPoint_Bridge_*` entries are wire bridges by pitch and drill. They are left with their reasons in `COVERAGE.md`.