Use
Arrow #214 / 1/4 inch
Manufacturer-listed JT21 staple.
Arrow places #214 in the JT21 light-duty family.
Evidence note C022 · United States
Which staples fit an Arrow JT21 stapler?
The printed fraction is only leg length. It does not make JT21 and T50 staples interchangeable.
Direct answer
Use JT21-family #214 (1/4 inch), #215 (5/16 inch) or #276 (3/8 inch). Do not substitute T50 #506.
Arrow’s own staple guide assigns those three item families to JT21 light-duty tools. #276 and T50 #506 both use a 3/8-inch leg, but they belong to different staple formats. Matching one dimension is not a compatibility test.
Decision map
What the identifiers actually prove
Family resemblance is not compatibility evidence. Each row stops exactly where the cited source stops.
Use
Arrow #215 / 5/16 inch
Manufacturer-listed JT21 staple.
Arrow places #215 in the JT21 light-duty family.
Use
Arrow #276 / 3/8 inch
Manufacturer-listed longest JT21 option in the checked guide.
Arrow identifies #276 as the 3/8-inch JT21 staple.
Do not infer
Arrow T50 #506 / 3/8 inch
Same leg length, different staple family.
The product number and family define crown/wire format; 3/8 inch alone does not.
Before buying
Run these checks in order.
- 01
Read the stapler label and confirm it calls for JT21 staples.
- 02
Choose the leg length for the material: #214, #215 or #276.
- 03
Reject packages that say T50/#506 without also naming JT21 compatibility.
- 04
Unload and clear the tool according to its manual if a wrong-family staple has already jammed it.
Primary evidence
Source links, not search snippets.
Evidence boundary
What this page does not prove
This page maps Arrow’s published JT21 staple families. It does not approve unbranded dimensional lookalikes or tell you which leg length is safe for every substrate, concealed wire or workpiece.