Thread Tension; Lower Thread Tension; Specifications <-03[]; Heavy-Weight Materials - Brother bas-311hn Instruction Manual

4. PREPARATION BEFORE SEWING

4-5. Thread tension

[Thread tension reference]
Specifications
Upper thread
Lower thread
Upper thread tension (N)
[Tension value]
Lower thread tension (N)
Pre-tension (N)
Needle
Normal sewing speed
*1 This is the tension value when the pretension is 0.1 N.

4-5-1. Lower thread tension

Weaker
28
Medium-weight materials
(-03[])
#50 or similar
#50 or similar
0.8 − 1.2
[80 - 120]*1
0.1 − 0.3
DP x 5 #16
2,000 sti/min
Stronger

Heavy-weight materials

(-05[])
#20 or similar
#20 or similar
1.4 − 1.8
[140 - 180]*1
0.2 − 0.3
0.1 − 0.6
DP x 17 #19
2,000 sti/min
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
BAS-311HN, BAS-326H
Seatbelt (-07A)
#4 or similar
#4 or similar
1.2 − 2.0
1.0 − 1.5
0.3 − 0.6
DP x 17 #25
1,300 sti/min