4. PREPARATION BEFORE SEWING
28
BAS-311HN, BAS-326H
4-5. Thread tension
[Thread tension reference]
Specifications
Medium-weight materials
(-03[])
Heavy-weight materials
(-05[])
Seatbelt (-07A)
Upper thread #50 or similar #20 or similar #4 or similar
Lower thread #50 or similar #20 or similar #4 or similar
Upper thread tension (N)
[Tension value]
0.8 − 1.2
[80 - 120]*1
1.4 − 1.8
[140 - 180]*1
1.2 − 2.0
Lower thread tension (N)
0.2 − 0.3 1.0 − 1.5
Pre-tension (N)
0.1 − 0.3 0.1 − 0.6 0.3 − 0.6
Needle DP x 5 #16 DP x 17 #19 DP x 17 #25
Normal sewing speed 2,000 sti/min 2,000 sti/min 1,300 sti/min
*1 This is the tension value when the pretension is 0.1 N.
4-5-1. Lower thread tension
Adjust the thread tension to the weakest possible tension by
turning the thread tension nut (1) until the bobbin case will
not drop by its own weight while the thread end coming out
of the bobbin case is held.
2536Q
Stronger
Weaker
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