Library › Hardware › Heat-set insert holes: hole cutters and test bosses for every insert…

G1/8 × 12.7 test boss

G1/8 × 12.7 test boss: Ø24.0 × 16.7, insert hole Ø12 × 13.7 on top, screw clearance through

Exact dimensions. True size, no printing tolerance added. Threads are plain cylinders at the major diameter.

STEP STL free, CC BY 4.0 (credit "Xem Studio")

Dimensions

thread	G1/8
insert_length_mm	12.7
hole_mm	12.0
hole_depth_mm	13.7
boss_od_mm	24.0

Let your AI pull this. Add https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.

Set it up →

From the full sheet

Heat-set insert holes: hole cutters and test bosses for every insert size: every size, notes, mating features and sources. How do I model the hole for a heat-set insert?

Other sizes

M2 × 3 hole cutter
M2 × 3 test boss
M2.5 × 4 hole cutter
M2.5 × 4 test boss
M3 × 5.7 hole cutter
M3 × 5.7 test boss
M3 × 3 hole cutter
M3 × 3 test boss
M3 × 4 hole cutter
M3 × 4 test boss
M4 × 8.1 hole cutter
M4 × 8.1 test boss
M4 × 4 hole cutter
M4 × 4 test boss
M5 × 9.5 hole cutter
M5 × 9.5 test boss
M5 × 5.8 hole cutter
M5 × 5.8 test boss
M6 × 12.7 hole cutter
M6 × 12.7 test boss
M8 × 12.7 hole cutter
M8 × 12.7 test boss
M10 × 12.7 hole cutter
M10 × 12.7 test boss
#2-56 × 3.2 hole cutter
#2-56 × 3.2 test boss
#4-40 × 5.7 hole cutter
#4-40 × 5.7 test boss
#4-40 × 3.6 hole cutter
#4-40 × 3.6 test boss
#6-32 × 7.1 hole cutter
#6-32 × 7.1 test boss
#6-32 × 3.8 hole cutter
#6-32 × 3.8 test boss
#8-32 × 8.2 hole cutter
#8-32 × 8.2 test boss
#8-32 × 4.7 hole cutter
#8-32 × 4.7 test boss
#10-24 × 9.5 hole cutter
#10-24 × 9.5 test boss
#10-32 × 9.5 hole cutter
#10-32 × 9.5 test boss
1/4-20 × 12.7 hole cutter
1/4-20 × 12.7 test boss
1/4-20 × 6.4 hole cutter
1/4-20 × 6.4 test boss
5/16-18 × 12.7 hole cutter
5/16-18 × 12.7 test boss
3/8-16 × 12.7 hole cutter
3/8-16 × 12.7 test boss
G1/8 × 12.7 hole cutter