Browning Split Taper Bushing Sizes

A Split Taper bushing has a double-split barrel and a 3/4 inch per foot taper on the diameter, and it is keyed to both the shaft and the hub. The series letter is the first part of the bushing number and the bore is the second, so an H 1 1/8 is an H series bushing bored 1 1/8 inches. This guide gives the bore range of every series, the stock metric and spline bores, what separates the system from Q-D bushings, and how to identify a bushing you already have. The full range is in the Split Taper bushings category of the bushings section.

What are the standard sizes of Browning Split Taper bushings?

The series run G, H, P, B, Q, R, S, U, W and Y, and every letter but G, H and B carries a number after it. Inch bores cover 3/8 inch to 7 7/16 inches across the standard range. Each series is listed in two forms, Type 1 and Type 2, and each form has its own bore range, so the series letter alone does not fix the bore the bushing can take.

The two smallest series take two cap screws and the rest take three, apart from the W and Y sizes, which take four. Torque rises with the series: a G 1/2 and an H 1 1/8 are tightened to 95 inch-pounds, a P1 1 3/4 and a B 1 1/2 to 192, a Q1 1 15/16 and an R1 2 3/16 to 348, and the W sizes to 3,000. The rest of the range is numbered the same way, series letter then bore: a P2 1 1/4, a P3 1 1/8, a Q2 2, a Q3 2, an R2 1 1/2, an S1 2, an S2 3, a U0 3, a U1 3, a U2 2 1/2, a W1 4 1/8 and a W2 5. The Y0 bushing is made to order rather than stocked.

The smaller steel sizes are the R1 at 1 1/8 and 1 3/16 inches, the R2 at 1 3/8, the S1 at 1 11/16 and 1 3/4 and the S2 from 1 7/8 to 2 1/8 inches. The U0 and U1 from 2 3/8 to 3 3/16 inches and the U2 from 2 7/16 to 3 3/16 inches are cast iron, the W and Y bushings are gray iron, and the rest of the range is sintered steel or ductile iron.

What metric and spline bores do Split Taper bushings come in?

Stock metric bores run from 10 mm to 95 mm, and stock spline bores cover the 6B, 10B and involute forms from .978 inch to 1 3/8 inches. Both are ordinary stock items rather than specials, and both use the same series letters as the inch range.

Stock spline bores

Inch bores below 1/2 inch are supplied with no keyseat. Some sizes carry a shallow keyseat and are supplied with a special key cut to fit a standard depth keyseat in the shaft, and at 1 3/8 inches a 5/16 by 5/32 keyway is supplied unless the 3/8 by 3/16 keyway is asked for on the order.

Which Split Taper bushing bores can you order?

The bores below are the ones we list, series by series: 562 bushings in 18 series, each linked to the bushing bored to it. A bore is the second half of the part number, so the 1 1/2 listed under R2 is an R2 1 1/2. The list is read from the Split Taper bushings section as the page loads, so a part the manufacturer withdraws drops out of it, and a bore the range above allows but we do not list is not shown.

Where one bore is listed twice in a row, the two designations are separate part numbers: the product page states the keyseat, the outside diameter, the length through the bore and the cap screw size for each. A millimeter bore states MM after the figure, and a spline bore states its spline form after the bore. The bushing hubs filed with these state no bore of their own, so they are listed in the Split Taper bushings section rather than in a table read by bore.

What is the difference between a Split Taper and a Q-D bushing?

They are two separate bushing systems. The Split Taper bushing is keyed to both the shaft and the hub, with an external key that provides positive drive so the cap screws carry no torque, and it has the highest torque carrying capacity in the Browning bushing line. The Q-D bushing is drawn into the hub by cap screws through its flange, can be mounted with the flange facing either way, and carries a set screw over the keyway on every series except JA.

The ranges differ as well. Split Taper covers 3/8 inch to 7 7/16 inches in inch bores, 10 mm to 95 mm in metric and a set of spline bores; Q-D covers 1/2 inch to 7 inches in inch bores and 24 mm to 100 mm in metric, and is fully interchangeable with other makers' Q-D bushings. The series letters differ too, which is usually the quickest way to tell which system a part belongs to: Split Taper uses G, H, P, B, Q, R, S, U, W and Y, while Q-D uses JA, SH, SDS, SD, SK, SF, E, F, J, M, N and P. A Split Taper P always carries a number after the letter, and a Q-D P never does. Bore ranges and mounting for the Q-D system are covered in the Q-D bushing guide.

How do you identify a Split Taper bushing?

Read the part number stamped on it: a Split Taper bushing is numbered by the series letter and the bore, written as the letter, a dash and the bore, for example H-1 1/8. If the number is unreadable, the barrel is split in two places rather than one, and the taper is 3/4 inch per foot on the diameter, which is the taper the whole system uses.

Measure the shaft for the bore and count the cap screws to narrow the series: two on G and H, three from P1 through U2, and four on the W and Y sizes. Match the cap screw thread and length against the table above and the series follows. The product page states the bore, the keyseat, the outside diameter, the length through the bore, the cap screw size and the wrench torque the manufacturer publishes for that part. Send the sheave number and the shaft diameter through the technical support form if the stamping has worn away entirely.

Which bushing does a Browning sheave take?

On a Split Taper sheave the bushing is named either by a letter in the part number or in brackets after it. An AK89H is a single groove cast iron sheave for an A section belt, 89 being the nominal diameter reference and the trailing H the bushed bore; the whole AK30H to AK184H range takes H bushings. On the B5V and TB sheaves the bushing is shown in brackets instead, so a 1TB34 takes a P1, a 2B5V46 takes a B and a 2B154R takes an R1.

The sheave is sold without the bushing, which is what lets one sheave serve a whole range of shafts: choose the V-belt sheave for the ratio and the belt section, then the bushing for the shaft. Where a shaft diameter is given as a bore code rather than in inches, the shaft size conversion chart decodes it.