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High-speed, Overlock / Safety Stitch Machine – MO-6800S Series

This advanced overlock / safety stitch machine is easier to use and promises superior cost effectiveness. The MO-6800S Series responds to various kinds of sewing materials and processes, producing delicate and beautiful soft-to-the-touch seams while further reducing operating noise as well as increasing durability. This advanced overlock / safety stitch machine is easier to use and promises superior cost-effectiveness.responsiveness from light- to heavy-weight materials with a lower applied tension. Comes with differential feed and cloth cutting knife.

The machine achieves beautifully finished seams of improved quality even when run at a high speed.

  • The machine is widely applicable to the sewing of light- to heavy-weight materials. Since the machine is provided with a needle thread take-up mechanism and a looper thread take-up lever, it ensures high-quality, well-tensed and soft seams with a beautiful texture which flexibly correspond to the elasticity of the materials even when run at speeds as high as 7,000 sti/min. In addition, the machine has a wider and brighter needle entry and provides improved responsiveness to the materials, thereby helping the operator use the machine more easily. The optimally-balanced design of the machine reduces both operating noise and vibration, contributing to more comfortable sewing work.

The machine is provided with functions which contribute to easier operation.

  • The differential-feed micro-adjustment mechanism, external increasing of the differential feed ratio and the main feed dog height can all be adjustable on the front face of the sewing machine with a screwdriver. The machine is provided as standard with functions which enable easy and best-suited adjustments according to the material to be used.

The sewing machine complies with the “Juki Group Green Procurement Guidelines” on the use of hazardous substances, which is stricter than other restrictions, such as those of the RoHS Directive.



Model name MO-6804S MO-6814S MO-6816S
Stitch type 1-needle overlock 2-needle overlock Safety stitching
Stitch style in the U.S.A. 504 514 516
Max. sewing speed 7,000sti/min
Stitch length 0.6 ~ 3.8 (4.5) mm
Needle gauge 2.0 3.0, 5.0
Overedging width 1.5, 4.0 3.0, 4.0 4.0, 5.0, 6.0
Differential feed ratio For gathering 1:2 (Max. 1:4), For stretching 1:0.7 (Max. 1:0.6)
Needle bar stroke 24.5mm
Inclination angle of the needle 20°
Needle bar bushing Lower bushing method
Needle DC×27 (excluding some subclass model)
Max. lift of the presser foot 7mm (excluding some subclass model)
Max. presser foot pressure 63.7N (6.5kgf)
Stitch adjusting method By push-button
Differential-feed adjusting method By lever (with micro-adjustment)
Weight of the machine head 27kg
Lubrication Automatic
Lubricating oil JUKI Machine Oil 18 (equivalent to ISO VG18)
Needle cooler Provided as standard
Needle thread heat remover Provided as standard

Devices & Attachments

Model Part No. Description
Chain-off thread trimming device
T053 70000081 Pneumatic flat cutter
T054 70000082 Pneumatic side cutter (for overlock machine)
Pneumatic chain-off thread suction device
MC904 / MC907 70000083 / 70000102 Specific to chain-off thread, pedal-operated clutch motor / servo motor
MC905 / MC908 70000084 / 70000103 MC904 / MC907 + Air type auto-lifter clutch motor / servo motor
MC906 / MC909 70000085 / 70000104 Pneumatic chain-off thread + cloth chips clutch motor / servo motor
MC910 / MC911 70000106 / 70000107 MC906 / MC909 + Air type auto-lifter clutch motor / servo motor
Combination table of “chain-off thread suction device” and “auto-lifer” which correspond to “chain-off thread trimming device”.

Chain-off thread trimming device + Chain-off thread suction device Auto-lifter
T053 or T054 MC904 / MC907 Clutch motor / servo motor
MC905 / MC908 Air type auto-lifter clutch motor / servo motor
MC906 / MC909 Clutch motor / servo motor
MC910 / MC911 Air type auto-lifter clutch motor / servo motor
Gathering device
S206 70000089 Swing-type gathering device (interlocked with pedal / for overlock machine) The attachment opens with the presser foot pedal. This facilitates material setting on the machine. Furthermore, knee-control type differential-feed adjusting device is built in the attachment. It controls a differential-feed ratio as desired, thereby enabling the operator to make beautiful gathers.
S207 70000090 Swing-type gathering device (interlocked with pedal / for safety stitch machine)(DF6)
S208 70000091 Swing-type gathering device (interlocked with pedal / for safety stitch machine) (FF6)
Guide, tape guide
H253 40159861 Cloth edge guide ruler (for overlock machine) A swing type edge guide.
H254 40159862 Cloth edge guide ruler (for safety stitch machine)
Q143 40159863 Tape guide – This attachment is used attached on the machine head (face plate). It is used for tapes with the width of 7mm or less.
Feller, Binder
N080 70000095 Reinforcement tape attachment binder – This binder binds the edge of a pocket bag while cutting round its periphery.
Optional Devices
40159749 Micro-lifter – The micro-lifter is suited to fine adjustments of the lifting amount of the presser foot so as to prevent puckering.
R040 70000098 Tape holder – Table-mounting type tape folder
Z065 70000092 Square upper knife (for overlock machine)
Z067 70000093 Square upper knife (for safety stitch machine)


Subclass Machine List

Model No. Materials No. of needles No. of threads Needle
Overedging width No.
of feed
dog rows
Bottom differential feed ratio Presser
1-needle overlock – For runstitching in general fabric
(Suitable for under shirts, T-shirts, trousers, one-piece dresses, skirts & blouses)
MO-6804S-0E4-30H L~M 1 3 4.0 2 3.8 1:0.7~1:2 6.0 DCx27
For rolled hemming (folded downward)
(Suitable for hankerchief & scarf)
MO-6804S-0A4-150 EL~L 1 3 1.5 2 3.8 1:0.7~1:2 6.0 DCx1
2-needle overlock – For runstitching in general fabric
(Suitable for under shirts, polo shirts, T-shirts, trousers, one-piece dresses, skirts & sportswear)
MO-6814S-BD6-30H L~M 2 4 2.0 3.0 3 3.8 1:0.7~1:2 5.5 DC×27 #11 7,000
MO-6814S-BE6-40H M~H 4.0 7.0 6,500
L~M 2.0 5.0 7,000
4.0 5.0
For tape attaching – G44: Tape attaching presser foot Q143: Tape guide
(Suitable for under shirts, knit shirts, polo shirts, T-shirts, one-piece dresses, sportswear & pyjamas)
L~M 2 4 2.0 3.0 3 3.8 1:0.7~1:2 5.5 DC×27 #9 7,000
3.0 DC×27
M~H 7.0 DC×27
Safety stitching – For runstitching in general fabric
(Suitable for suits, coats, jumpers, trousers, one-piece dresses, skirts, sportswear, dress shirts, blouses & jeans)
MO-6816S-DE6-30H L~M 2 5 3.0 4.0 3 3.8 1:0.7~1:2 5.5 DC×27 #11 7,000
MO-6816S-FF6-30H 5.0 5.0
MO-6816S-FF6-50H M~H 7.0 DC×27
MO-6816S-FH6-50H 6.4
L~M 3.0 4.0 2 5.0 DC×27
For rolling-in tape – N075: Clean finish top and bottom
(Suitable for suits, coats & jeans)
(2-needle type for
on pocket bags)
M~H 2 4 5.0 5.0 3 3.8 1:0.7~1:2 5.0 DC×27
3-needle safety stitching
(Suitable for one-piece dresses, polo shirts, knit shirts & sportswear)
MO-6843S-1D6-40H M~H 3 6 5.0+2.0 3.0 3 3.8 1:0.7~1:2 6.5 DC×27
MO-6843S-2D6-40H 3.0+2.0

*”sti/min” stands for “Stitches per Minute


When you place your orders
Please note when placing orders, that the model name should be written as follows:MO-6800S