Double-Sided Timing Belts | Teeth on Both Sides | Texas Belting

Q: What is a double-sided timing belt?

A timing belt with teeth on both inside and outside surfaces. Enables serpentine drives, counter-rotating shafts, and complex multi-sprocket layouts not possible with single-sided belts.

Q: What does the D mean in a timing belt part number?

D indicates double-sided. D5M = double-sided 5mm HTD. DL = double-sided L-profile trapezoidal. Both sides have identical teeth.

Q: Can I use the same sprockets for both sides of a double-sided belt?

Yes. Both sides have the same profile and pitch. The sprockets are the same as single-sided belts of that profile.

Q: Are double-sided belts thicker than single-sided?

Yes. Approximately twice as thick due to teeth on both surfaces. Minimum sprocket diameters are larger because the thicker belt bends less easily.

Q: Are double-sided timing belts a stock item?

Common sizes in D5M, D8M, DL, DH may be in stock. Many sizes are specialty with 1-3 week lead times. Call 888-203-2358 to confirm.

Q: Can I use a flat idler on a double-sided belt?

No. Both sides have teeth. All contact points must be toothed sprockets matching the belt profile.

Q: Are double-sided belts available in urethane?

Select profiles available in urethane, particularly T-profile and AT-profile. Most HTD and ANSI double-sided are neoprene only.

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Double-Sided Timing Belts

Double-sided timing belts have teeth on both the inside and outside surfaces, allowing the belt to engage sprockets on both sides. This enables serpentine drive layouts, counter-rotating shaft configurations, and multi-sprocket arrangements where both sides of the belt must mesh with toothed sprockets. Standard single-sided timing belts have teeth on one side and a flat back, which can only drive sprockets on the toothed side.

Double-sided timing belts are available in neoprene and polyurethane construction across the most commonly used profiles. They are a specialty product with longer lead times and higher costs than single-sided belts of the same profile and size. Texas Belting stocks select double-sided sizes and can source any double-sided timing belt from major manufacturers.

Double-sided timing belt overview:
Construction: Teeth on both sides of the belt (inside and outside)
Designation: Typically marked with a "D" prefix or suffix (for example, D5M, D8M, DXL, DL, DH)
Available profiles: HTD (D3M, D5M, D8M, D14M), trapezoidal (DXL, DL, DH), GT, T-profile
Materials: Neoprene with fiberglass cord (standard); urethane with steel cord (specialty)
Format: Closed-loop only

Need double-sided timing belts?

Double-sided belts are a specialty item. Send us your part number or drive layout and we will confirm availability, lead time, and pricing.

Request a Quote 888-203-2358

How Double-Sided Timing Belts Work

On a standard single-sided timing belt, the toothed side engages the sprockets while the flat back side runs over flat idler pulleys (if used). On a double-sided belt, both surfaces have teeth. This allows the belt to engage toothed sprockets on the inside of the belt loop and on the outside, enabling more complex drive configurations:

Serpentine drives: The belt wraps around multiple sprockets in an S-pattern, alternating between inside and outside tooth engagement. This allows a single belt to drive multiple shafts from a single motor.
Counter-rotating drives: Two shafts that need to rotate in opposite directions can be driven by a single double-sided belt, with one shaft engaging the inside teeth and the other engaging the outside teeth.
Complex multi-sprocket layouts: Equipment designs that require the belt path to wrap both inside and outside of multiple sprockets in a single loop.

Both sides must be the same profile and pitch. On a double-sided timing belt, the teeth on the inside and outside are identical in profile, pitch, and tooth count. Both sides use the same sprockets. The belt is thicker than a single-sided belt of the same profile because it has two layers of teeth with the tensile cord running through the center.

Double-Sided Part Number Format

Double-sided timing belts are designated by adding a "D" prefix or suffix to the standard part number. The specific format varies by manufacturer and profile.

Example Part Number	Profile	Pitch Length	Width	Notes
D600-5M-15	D5M (HTD double-sided)	600mm	15mm	"D" prefix indicates double-sided
D1120-8M-20	D8M (HTD double-sided)	1120mm	20mm	"D" prefix indicates double-sided
300DL075	DL (trapezoidal double-sided)	30.0"	3/4"	"D" before profile code
450DH200	DH (trapezoidal double-sided)	45.0"	2"	"D" before profile code

Not sure how to read your double-sided part number? Call 888-203-2358 or send us the number and we will identify it.

Profiles Available in Double-Sided

Profile Family	Double-Sided Designation	Pitches Available	Material
HTD	D3M, D5M, D8M, D14M	3mm, 5mm, 8mm, 14mm	Neoprene (standard)
GT / GT3	D-GT3	3M, 5M, 8M	Neoprene
Trapezoidal (ANSI)	DXL, DL, DH	XL, L, H	Neoprene
T-Profile	DT5, DT10	5mm, 10mm	Neoprene or urethane
AT-Profile	DAT5, DAT10	5mm, 10mm	Urethane

D5M and D8M (HTD double-sided) are the most commonly stocked double-sided sizes. DL and DH are the most common ANSI double-sided profiles. Larger and less common sizes may require special order. Contact Texas Belting for current stock availability.

Double-Sided vs. Single-Sided: Key Differences

Factor	Single-Sided (Standard)	Double-Sided
Teeth	One side only (inside)	Both sides (inside and outside)
Back surface	Flat (can run over flat idlers)	Toothed (must engage toothed sprockets on both sides)
Belt thickness	Standard	Thicker (two tooth layers)
Minimum pulley size	Standard for profile	Larger minimum (thicker belt bends less easily)
Cost	Standard	Higher (specialty manufacturing)
Availability	Broadly stocked	Limited stock, many sizes made to order
Drive layouts	Standard two-sprocket or multi-sprocket (inside mesh only)	Serpentine, counter-rotating, complex multi-sprocket

Common Double-Sided Timing Belt Applications

Application	Why Double-Sided	Typical Profile
Textile machinery	Multiple rollers driven from a single belt, alternating wrap direction	D5M, DL, DT5
Packaging equipment	Counter-rotating seal bars, multiple driven stations	D5M, D8M, DL
Printing and converting	Multiple rollers at precise synchronization, serpentine layout	D5M, DL, DH
Paper handling	Multiple feed rollers driven in alternating directions	DXL, DL, D5M
Woodworking machinery	Multiple spindle drives with counter-rotating cutters	D8M, DH
Material handling conveyors	Multiple conveyor rollers driven from one belt in serpentine	D8M, D14M, DH
Automotive and engine accessories	Serpentine accessory drives with multiple pulleys	D5M, D8M
Medical and laboratory equipment	Compact multi-axis drives requiring counter-rotation	DXL, D3M, D5M

Double-Sided Timing Belt Brands We Carry

Brand	Double-Sided Products	Notes
Gates	PowerGrip D-HTD, D-GT3, D-trapezoidal	Broadest double-sided range in neoprene
Continental / ContiTech	Synchroforce double-sided HTD, T-profile	OEM and replacement
Bando	Bando double-sided HTD, trapezoidal	Japanese OEM spec
Diesel Belting	Diesel double-sided HTD	Cost-effective replacement for common D-HTD sizes
Megadyne	Megalinear double-sided	Neoprene and urethane double-sided options

Double-Sided Timing Belt FAQs

What is a double-sided timing belt?

A double-sided timing belt has teeth on both the inside and outside surfaces, allowing it to mesh with toothed sprockets on both sides of the belt loop. This enables serpentine drive layouts, counter-rotating shaft configurations, and complex multi-sprocket arrangements that are not possible with standard single-sided belts.

What does the "D" mean in a timing belt part number?

The "D" prefix or designation indicates double-sided. For example, D5M means double-sided 5mm pitch HTD, DL means double-sided L-profile trapezoidal. The teeth on both sides are the same profile and pitch.

Can I use the same sprockets for both sides of a double-sided belt?

Yes. Both sides of a double-sided timing belt have the same tooth profile and pitch, so the same sprockets are used on both sides. The sprockets for a D5M belt are the same 5M sprockets used with standard single-sided 5M belts.

Are double-sided belts thicker than single-sided?

Yes. Double-sided belts have teeth on both surfaces with the tensile cord layer in the center, making them approximately twice as thick as a single-sided belt of the same profile. This means minimum sprocket diameters are larger because the thicker belt does not bend as easily around small pulleys.

Are double-sided timing belts a stock item?

Common sizes in D5M, D8M, DL, and DH may be in stock. Many double-sided sizes are specialty items with lead times of 1 to 3 weeks. Call 888-203-2358 early in your project to confirm availability and lead time for your specific size.

Can I use a flat idler on a double-sided belt?

No. Both sides of a double-sided timing belt have teeth, so flat idler pulleys cannot be used. All contact points must be toothed sprockets that match the belt profile. If your drive layout requires a backside idler, you must use a toothed sprocket on the back side as well.

Are double-sided belts available in urethane?

Select double-sided profiles are available in urethane, particularly in T-profile (DT5, DT10) and AT-profile (DAT5, DAT10). Most HTD and ANSI double-sided belts are neoprene only. Contact Texas Belting for urethane double-sided availability.

Need Double-Sided Timing Belts?

Double-sided belts are specialty items. Send us your part number or drive layout for availability, lead time, and pricing.

Request a Quote

888-203-2358