Whatsminer KF1921 Chips Tin Fixture Stencil Plate 70mm

Whatsminer KF1921 Tin Fixture Stencil Plate 70mm – M20S / M21S Hashboard Repair

This KF1921 tin fixture stencil plate is a 70mm square tin-construction stencil with precision-engineered holes for accurate solder paste application on Whatsminer M20S and M21S ASIC chips. The KF1921 aperture pattern ensures uniform paste deposition in a single squeegee pass, preventing bridging and voids. Weighs just 50g, built for repeated use across hundreds of chip replacements.

Why Use a Stencil for KF1921 Chips

The KF1921 BGA layout is dense — freehand paste application risks bridging adjacent pads or leaving voids that produce cold joints after reflow. This stencil controls the volume and position of paste at every aperture, delivering consistent results that reduce rework and improve first-pass yield on M20S/M21S hashboard repairs.

How to Use

Place the KF1921 chip pad-side up. Align the stencil over the pads. Apply paste in one pass. Lift vertically. Place the chip on the hashboard and reflow. Clean the stencil with IPA after use.

KF1921 Stencil Plate Specifications

Related Whatsminer & Universal Tin Stencils

• KF1921 Tin Tool Kit with Holder – M20 / M21 Series
• Universal Tin Fixture – BM1387 / BM1393 / BM1397 / BM1398
• BM1485 Tin Fixture Stencil – L3+ 100mm
• Innosilicon T1 / Lovecore A1 Tin Fixture Stencil

Stocking stencils for Whatsminer repair? Contact us at contact@lys-sz.com for tin fixtures and chip-level tooling.

Worldwide shipping from our Shenzhen warehouse.