Strongest commercial thread. Almost no stretch. Fire retardant to 800F
kevlar thread Kevlar® thread is one of the strongest and most fire retardant commercially available threads. It is about 2.5 times stronger than nylon or polyester, has almost no stretch, does not melt, and decomposes at 800°F.

New ! All Groz-Beckert Machine Needles and C.S. Osborne Hand Sewing Needle Kits

Information
Code Color Description
kevlar_juniors Kevlar Thread - Small Spools Kevlar Thread - Small Spools
Buy what you need. Spools, coils, and tubes priced $7 to $40 		Select
Kevlar_Thread_Size_046 Kevlar Thread - Size 46 / Tex 40 / Govt. B Kevlar Thread - Size 46 / Tex 40 / Govt. B
Use to sew lightweight fabrics and leather, gear, and fishing tackle. Average thickness: 0.21 mm (8/1000 In). Nominal tensile strength: 14 Lbs. Needle sizes: 90/14 to 100/16. 		Select
kevlar_thread_Size_069 Kevlar Thread - Size 69 / Tex 60 / Govt. E Kevlar Thread - Size 69 / Tex 60 / Govt. E
Use to sew light to middleweight fabrics and leather, and for reinforcing lighter duty belts. Average thickness: 0.25 mm (10/1000 In). Nominal tensile strength: 23 Lbs. Needle sizes: 100/16 to 110 /18. 		Select
Kevlar_Thread_Size_092 Kevlar Thread - Size 92 / Tex 80 / Govt. F Kevlar Thread - Size 92 / Tex 80 / Govt. F
Use to sew middleweight fabrics and leather and reinforcing lighter duty belts. Average thickness: 0.29 mm (11/1000 In). Nominal tensile strength: 30 Lbs. Needle sizes: 110/18 to 125/20. 		Select
kevlar_thread_size_138 Kevlar Thread - Size 138 / Tex 135 / Govt. FF Kevlar Thread - Size 138 / Tex 135 / Govt. FF
Use to sew middleweight fabrics and leather and reinforcing light to medium duty belts. Average thickness: 0.36 mm (14/1000 In). Nominal tensile strength: 45 Lbs. Needle sizes: 125/20 to 140/22. 		Select
kevlar_thread_size_207 Kevlar Thread - Size 207 / Tex 210 / Govt. 3-Cord Kevlar Thread - Size 207 / Tex 210 / Govt. 3-Cord
Use to sew middleweight fabrics and leather and reinforcing light to medium duty belts. Average thickness: 0.46 mm (18/1000 In). Nominal tensile strength: 64 Lbs. Needle sizes: 140/22 to 180/24. 		Select
kevlar_thread_size_346 Kevlar Thread - Size 346 / Tex 400 / Govt. 5-Cord Kevlar Thread - Size 346 / Tex 400 / Govt. 5-Cord
Use to reinforce medium to heavy duty belts, and to sew heavyweight and multi-ply fabrics, canvas, leather, and footwear. Average thickness: 0.65 mm (26/1000 In). Nominal tensile strength: 135 Lbs. Needle sizes: 230/26 to 280/28 		Select
kevlar_thread_size_800 Kevlar Thread - Size 800 / Tex 800 Kevlar Thread - Size 800 / Tex 800
Use mostly for non-sewing applications such as binding, reinforcing, hanging, and whipping where exceptional strength is required. Average thickness: 1.14 mm (45/1000 In). Nominal tensile strength: 225 Lbs. 		Select

Related Products 

Kevlar Thread
kevlar thread
Kevlar thread is heat resistant to 800F. Use up to size 69 in home sewing machines. It is also one of the strongest commercially available threads, but it only comes in yellow.

Fire Retardant Sewing Thread
Fire retardant thread
Fire Retardant Sewing Thread - Use for sewing fire retardant gear like racing suits, welding apparel, and firefighting gear. Heat resistant to 700F.

Fire Retardant Embroidery Thread
Fire retardant thread
Fire Retardant Embroidery Thread - Looks and performs like regular embroidery thread. Use it for embroidering names and logos on fire retardant clothing and gear. Heat resistant to 700F.

PTFE Coated Fiberglass Thread
hand sewing needles
PTFE coated fiberglass thread is made from continuous fiberglass filaments that are heat resistant, chemical resistant, and strong. The PTFE Coating is heat resistant to 620F. The fiberglass filament has a 1022F operating temperature.

Nomex Thread
nomex thread

Nomex thread is heat resistant to 700F. Use up to size 69 in home sewing machines. With very few exceptions, it only comes in white.

Needles
groz-beckert needles 

Groz-Beckert Needles with cross reference to other brands, needle size charts, and our exclusive needle / machine use guide.

Nylon Thread
nylon thread

Polyester Thread
polyester thread

Nylon and Polyester Thread - Use a heavier weight nylon or polyester thread instead of a lighter weight Kevlar. For example, a Size 138 nylon or polyester thread has about the same strength as a Size 69 Kevlar thread, costs about 80% less, and comes in colors. But, it is twice as thick, not fire retardant, and has 25% elasticity.

Aurifil Cotton
aurifil cotton thread
Cotton thread has a lower heat resistance. It chars, but it does not melt.