Materials:

Pulleys: 1006-1010 Steel - typically HRP&O, alternatively CRDQ

              Thickness Tolerance: ±.0015" within a lot for 11-7 guage,

                                         ±.005" within a lot for .250" and .375"

                                        Standard gauge tol. between lots.                

Guage

Nominal

Range

Load  Guideline*

11

.120"

.1276-.1116"

11 HP

9

.150"

.1575-.1415"

16 HP

7

.179"

.1873-.1713"

20 HP

2

.250"

.238-.262"

Not Rated

.375

.365-.405"

Not Rated

*= For guidance only - Testing in operating conditions is recommended.

Hubs: Steel - 12L14, 1215, 1018, 1045, 1144 and others

Tolerances:

Outside Diameter

±.030"

Over Pin (V-Belt pulleys)

±.030"

Groove angles

±1°

Runout

[MORE]

Radial  (Max. TIR)

.015"

Axial (Max. TIR per inch of OD)

.005"

Miscellaneous Technical Information:

What is split-forming? -    New Hampshire Industries manufactures split-formed pulleys to create both drive pulleys and idler pulleys.  In the split-forming process a disc of a ductile, work-hardenable material is split on edge and a groove is formed.  NHI split-formed products are generally made of low carbon steel, although we have also manufactured product from both aluminum and stainless steel.  Because steel is the most common material used, we here at NHI have a tendency to call these products "split steel".

Standard Bore Sizes - Click here for more information

Standard Set Screw Sizes - Click here for more information

Available Finishes - Click here for more information

Measuring "V" pulleys - NHI employs the "over pin" method to ensure that V-Belt grooves are correctly sized.  This process is defined by the Rubber Manufacturers Association (www.rma.org) and the Mechanical Power Transmission Association (www.mpta.org) standards for V-Belt Pulleys.  This is a more repeatable method than measuring the effective outer diameter (EOD) of a belt in the groove.  The catalog pages for the split-formed V-groove pulleys do list an approximate EOD for each belt type.  It is shown for reference only.