Pitch length LdLength along the neutral line of the belt, this is the number in the part number. DIN catalogues call it Lw; the value is the same. Source: part no. XPZ 3350 Ld L=L Pio 3VX1320, DIN 7753-1 / ISO 4184
La
3363 mm
Outside length LaLength along the back of the belt, the one a tape measure gives. For profile SPZ it is 13 mm longer than the pitch length. Source: Optibelt Technical Manual V-Belt Drives
wd
8.5 mm
Pitch width wdBelt width at the neutral line. It equals the pitch width of the SPZ pulley groove: the belt and the pulley fit each other by it. Source: Optibelt Technical Manual V-Belt Drives (allworldmachinery.com/customer/docs/OPTIBELT_TECH_MANUAL_V-BELTS.pdf), table 5 (SK), table 14; DIN 7753-1 / ISO 4184
Design
coggedX in the part number
b
9.7 mm
Top width bWidth of the belt back. Use it to check the profile of an old belt with calipers. Source: Optibelt Technical Manual V-Belt Drives (allworldmachinery.com/customer/docs/OPTIBELT_TECH_MANUAL_V-BELTS.pdf), table 5 (SK), table 14; DIN 7753-1 / ISO 4184
h
8 mm
Height hHeight of the section from the back to the bottom face of the wedge. Source: Optibelt Technical Manual V-Belt Drives (allworldmachinery.com/customer/docs/OPTIBELT_TECH_MANUAL_V-BELTS.pdf), table 5 (SK), table 14; DIN 7753-1 / ISO 4184
m
0.245 kg
Mass mMass of one piece according to the supplier. Source: supplier
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About the belt
b×hsection9.7 × 8mm
Ldpitch length3350mm
wdpitch width8.5mm
mmass0.245kg
Narrow V-belt of profile SPZ, cogged with a pitch length of 3350 mm. Section 9.7 × 8 mm, pitch width 8.5 mm: the belt sits in the SPZ pulley groove by it. Mass 0.245 kg.
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Frequently asked questions
What do Ld, Lw and La mean?+
Ld and Lw are the pitch length along the neutral line: ISO writes Ld, DIN writes Lw, the number is the same. La is the outside length along the back; for SPZ it is 13 mm more. This belt has Ld 3350 mm and La 3363 mm.
Can I fit SPZ 3350?+
The size and groove are the same; a plain belt has no cogs on the underside, so it bends less easily on small pulleys. You can fit it, but belts of one drive should be of one brand and one design.
How do I measure an old belt if the number has worn off?+
The top width of SPZ is 9.7 mm and the height is 8 mm. A tape measure along the back gives the outside length La; subtract 13 mm to get the number in the part number.
How do I get a price and a lead time?+
Press “Request a quote” and send the part number and quantity. We reply with the price, availability and delivery terms for your country.
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