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BUILT FOR YOUR MACHINE / FITMENT WORKSHEET

Build drawings.
Better fit.

Customer measurements for excavator attachments and thumb builds. Bring the machine details. We’ll work through the fit.

Start the worksheet ↓
FIELD REFERENCE / AF–01

Measure once.
Define every point.

SCHEMATIC · NOT TO SCALE
Thumb length L: pivot center to outermost working tipSide view of a thumb. A straight dimension line connects P at the center of the main thumb pivot to T at the furthest working tip. Do not measure along the curved steel.L · STRAIGHT-LINE LENGTHP · MAIN THUMB PIVOT CENTERT · OUTERMOSTWORKING TIP
L = P → T. Side view: center of the thumb’s main pivot pin to the furthest working tip, in a straight line. Not the cylinder pin, bucket pin (unless shared), curved edge length or overall steel length.
Thumb width H, outside tip edge to outside tip edgeH · OUTSIDE TIP WIDTHVIEW ACROSS THE TIPS
H = outside → outside. Across the outermost working tips, perpendicular to the thumb centerline. Include tip thickness.

No existing thumb? Mark the proposed pivot center and intended tip location on a side-view photo. AllynFab must confirm fit, reach and clearances before fabrication. These sketches are measurement references, not fabrication drawings.

01 / Contact information
02 / Project type
03 / Machine & coupler
04 / Fitment dimensions

Enter either unit; the other converts automatically (1 in = 25.4 mm). Millimeters preferred. Use decimal inches. Leave unknown measurements blank—do not estimate. Converted values are rounded for display.

A · Stick-side pin diameter

Measure the pin shaft diameter, not the hole, head or retaining bolt.

B · Link-side pin diameter

Measure the second attachment pin shaft. Identify both pins in a photo.

C · Attachment pin centers

Straight-line distance from center of pin A to center of pin B.

D · Stick width

Outside face to outside face across the stick boss at pin A.

E · Inside ear spacing

Clear distance between the inside faces of the attachment mounting ears.

F · Current bucket width

Outside-to-outside width at the bucket cutting edge.

G · Desired attachment width

Overall outside width of the attachment you want built.

H · Thumb Width at Tips

Outside edge of leftmost tip to outside edge of rightmost tip; not the gap between tines.

L · Thumb Length

Straight-line distance from center of the thumb main pivot pin to the outermost working tip (see diagram).

J · Thumb pivot to linkage pin

05 / Project notes
06 / Reference photos & drawings

Include both sides of the machine linkage, coupler ID, pins with a measuring tool, bucket and thumb tips.

Up to 10 files, 10 MB each, 20 MB total. When you send, files upload privately to AllynFab’s Wix Media Manager. Your request email includes download links for AllynFab and PJs Design & Excavation.