The Model 20SJ is a 10” x 20” stationary jaw crusher, utilizing the same crushing platform as the 20TJ but without the mobility. READ MORE. ... From the 20,000lb. 50TJ Tracked Jaw Crusher to the 1,500lb. 10SJ Stationary Jaw Crusher, our equipment makes short work of previouslydifficult jobs. Each has its own performance niche.