PAM 63–132 Gearbox Input: Shaft and B5 Flange

The PAM 63, 71, 80, 90, 100, 112 and 132 codes in gearbox catalogues indicate the IEC frame size of the motor intended for the input. In this range DRG Motor offers 13 different 4-pole types (22 models, aluminium and cast iron) plus a single 2-pole model in frame 63; the shaft grows from 14×30 mm on 71 to 38×80 mm on 132, and the B5 flange outer diameter from 160 mm to 300 mm. The PAM size alone is not enough, though: the same size can come with a B5 large flange or a B14 small flange, and the input bore and key must be checked separately.

Grey DRG three-phase electric motor – illustrative image for IEC frame dimensions for PAM 63–132 gearbox inputs

All motors in these frames belong to the three-phase asynchronous electric motors range; frame 71 is available only with an aluminium housing. You can compare product pages by frame in the online motor shop. DRG Motor does not sell gearboxes; this article helps you compare the input of the gearbox you already have with DRG motor dimensions.

What does a PAM code tell you, and what not?

PAM is the name of the adapter through which the motor is attached to the gearbox input (motor connection flange and hollow input shaft). The number tells you which IEC frame the input was designed for: PAM 90 is an input intended for a 90S or 90L motor. That much the code does; most of what you need to order is missing:

Flange type: the same PAM size can be built as B5 (large flange with through holes) or B14 (small flange with tapped holes). Their outer diameters and bolt circles differ.
Input bore and key: the motor shaft enters the hollow input shaft of the gearbox. Bore diameter, keyway and bore depth must be compared with the motor's D, F and E dimensions.
Power and ratio: the PAM size does not say how many kW that gearbox accepts at that ratio. This value is read from the ratio row in the gearbox maker's catalogue.

The general B5 versus B14 selection logic is covered in flange motor for gearbox: B5 and B14 selection; here we focus only on the dimensional comparison for PAM 63–132.

Shaft and key dimensions for IEC frames 63–132

The first value to compare with the gearbox input bore is the motor shaft. The values below come from the B5 rows of the DRG catalogue and match the B3 shaft dimensions in the 4-pole product records.

IEC frame (PAM size)	Shaft D×E (mm)	Key width F (mm)	Shaft end thread DH
63	11×23	4	M4×12
71	14×30	5	M5×12
80	19×40	6	M6×16
90S	24×50	8	M8×19
90L	24×50	8	M8×19
100L	28×60	8	M10×22
112M	28×60	8	M10×22
132S	38×80	10	M12×28
132M	38×80	10	M12×28

Two points stand out. 90S and 90L carry the same shaft (24×50 mm), as do 132S and 132M (38×80 mm). In DRG data, 100L and 112M also share a shaft (28×60 mm, key 8 mm). That describes the motor side only; whether a PAM 100 and a PAM 112 input come with the same bore depends on the gearbox maker, so measure the bore anyway. Shaft, key and coupling details are in motor shaft diameter, key and coupling standards, and shaft diameters for every rating in the motor shaft diameter by kW table.

B5 flange dimensions: P, N, M and S

If the gearbox input is B5, four flange dimensions must match their counterparts on the gearbox: outer diameter P, spigot diameter N, bolt circle M and hole diameter S. IM B5 large-flange values from the DRG catalogue:

IEC frame	P – flange outer diameter (mm)	N – spigot diameter (mm)	M – bolt circle (mm)
63	140	95	115
71	160	110	130
80	200	130	165
90S	200	130	165
90L	200	130	165
100L	250	180	215
112M	250	180	215
132S	300	230	265
132M	300	230	265

IEC frame	S – flange hole diameter (mm)	T – spigot depth (mm)	LA – flange thickness (mm)
63	10	3	10
71	10	3.5	10
80	12	3.5	12
90S	12	3.5	12
90L	12	3.5	12
100L	14.5	4	13
112M	14.5	4	14
132S	14.5	4	14
132M	14.5	4	14

Values for all frames up to 355 are in the B5 motor flange dimensions table; for the difference between the through-hole (FF) B5 flange and the tapped (FT) B14 flange see B5 and B14 flange FF/FT difference.

The B14 small-flange table is not part of the DRG catalogue, so we give no B14 dimensions here and do not claim that a B14/B34 version exists for every frame. If your gearbox input is B14, send the flange outer diameter, bolt circle, spigot diameter and thread size on WhatsApp and we will check it.

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Same flange, different shaft: the frames most often confused

Putting the tables side by side shows why a PAM selection cannot stop at the flange:

80 and 90: the B5 flange is the same (P 200, N 130, M 165, S 12 mm), the shaft is not: 19×40 mm on 80, 24×50 mm on 90. An 80-frame motor may seat on a PAM 90 flange, but a 19 mm shaft does not fill a 24 mm bore.
63 and 71: both flange and shaft differ: P 140 mm with a 11×23 mm shaft on 63, P 160 mm with a 14×30 mm shaft on 71.
Compact 5.5 kW: the standard 4-pole 5.5 kW model is on frame 132S (DRG-132S-4-AL, shaft 38×80 mm). The compact DRG-112M-4K-AL delivers the same power on frame 112M (shaft 28×60 mm). So the same kW can mean two different inputs, PAM 132 or PAM 112; choose the model by the size on the gearbox.
Compact 11 kW: the DRG-132M-4K-AL delivers 11 kW on frame 132M with a 38×80 mm shaft; the standard 4-pole model in the same frame is 7.5 kW. On a PAM 132 input, check in the gearbox catalogue whether that power is permitted.

DRG models in the PAM 63–132 range

In frame 63, DRG's only model is the DRG-632-2-AL (0.25 kW, 3000 rpm class, 2-pole, aluminium); there is no cast iron or 4-pole model on 63. The 4-pole 0.25 kW motor is on frame 71 (DRG-711-4-AL) with a 14×30 mm shaft. The 4-pole models in the other frames:

Frame	Model (housing material)	Power	Rated speed / rated torque
71	DRG-711-4-AL (aluminium)	0.25 kW / 0.37 HP	1340 rpm / 1.78 Nm
71	DRG-712-4-AL (aluminium)	0.37 kW / 0.5 HP	1340 rpm / 2.64 Nm
80	DRG-801-4-AL (aluminium) DRG-801-4-GG (cast iron)	0.55 kW / 0.75 HP	1400 rpm / 3.75 Nm
80	DRG-802-4-AL (aluminium) DRG-802-4-GG (cast iron)	0.75 kW / 1 HP	1420 rpm / 5.04 Nm
90S	DRG-90S-4-AL (aluminium) DRG-90S-4-GG (cast iron)	1.1 kW / 1.5 HP	1445 rpm / 7.27 Nm
90L	DRG-90L-4-AL (aluminium) DRG-90L-4-GG (cast iron)	1.5 kW / 2 HP	1445 rpm / 9.91 Nm
100L	DRG-100L1-4-AL (aluminium) DRG-100L1-4-GG (cast iron)	2.2 kW / 3 HP	1450 rpm / 14.5 Nm
100L	DRG-100L2-4-AL (aluminium) DRG-100L2-4-GG (cast iron)	3 kW / 4 HP	1450 rpm / 19.8 Nm
112M	DRG-112M-4-AL (aluminium) DRG-112M-4-GG (cast iron)	4 kW / 5.5 HP	1450 rpm / 26.3 Nm
112M (compact)	DRG-112M-4K-AL (aluminium)	5.5 kW / 7.5 HP	1460 rpm / 36 Nm
132S	DRG-132S-4-AL (aluminium) DRG-132S-4-GG (cast iron)	5.5 kW / 7.5 HP	1460 rpm / 36 Nm
132M	DRG-132M-4-AL (aluminium) DRG-132M-4-GG (cast iron)	7.5 kW / 10 HP	1460 rpm / 49.1 Nm
132M (compact)	DRG-132M-4K-AL (aluminium)	11 kW / 15 HP	1465 rpm / 71.7 Nm

Torque values come from DRG records and agree with M = 9550·P/n (P in kW, n = nameplate speed in rpm); for the DRG-90L-4-AL, for example, 9550·1.5/1445 = 9.91 Nm. Models up to 3 kW are 230/400 V (Δ/Y), 4 kW and above 400/690 V (Δ/Y). For cable and protection sizing use the motor current chart.

Fields to read from the gearbox nameplate and catalogue

A gearbox nameplate often shows only the type, ratio and input size; flange and bore dimensions come from the catalogue or from measuring the part itself. Once this list is filled in, you can compare it line by line with DRG data.

Field to read on the gearbox	Where / how	Matching DRG data
Input size (PAM / IEC code)	Nameplate, order code or catalogue row	IEC frame: 63 … 132M
Input flange type: B5 or B14	Input description in the catalogue; if unsure, measure the flange outer diameter	If B5, the P value (table above); if B14, send us the dimensions
Spigot diameter	Inner locating diameter of the input flange	N
Bolt circle and hole/thread	Distance between two opposite hole centres; through hole or tapped	M and S
Input bore diameter	Bore inner diameter with a caliper	Shaft diameter D
Keyway width	Width of the keyway in the bore	Key F
Bore depth	From flange face to bottom of bore	Shaft length E
Ratio (i)	Nameplate	Output speed = rated speed / i
Permitted input power or output torque	Ratio row of the gearbox catalogue	Motor kW and rated torque (Nm)

Calculate output speed from the nameplate speed

"1500 rpm" is the motor's speed class (synchronous speed); when calculating gearbox output use the actual nameplate speed. Example: the DRG-90L-4-AL has a nameplate speed of 1445 rpm; with a ratio of i = 40 the output speed is 1445 / 40 ≈ 36.1 rpm (40 is only an example ratio). Calculating with 1500 would give 37.5 rpm. For output torque, rely on the value the gearbox maker gives for that ratio. The electric motor calculator helps with power and torque conversions.

Frequently asked questions

Does a PAM 90 input take a 90S or a 90L motor?

In DRG data both have the same shaft (24×50 mm), key (8 mm) and B5 flange; they differ in power (1.1 kW / 1.5 kW), and the 90L is 25 mm longer (B5 overall length L 336 / 361 mm). The power the gearbox permits at that ratio decides which one fits.

Can I choose a 5.5 kW motor for a gearbox marked PAM 112?

DRG has a compact 4-pole 5.5 kW model on frame 112M (DRG-112M-4K-AL, shaft 28×60 mm). The standard 5.5 kW 4-pole motor is 132S and does not carry PAM 112 input dimensions. With the compact model too, the gearbox's permitted input power must be checked.

My gearbox has a B14 input; can I find the dimensions here?

No. The DRG catalogue has no B14 small-flange table. Send the flange outer diameter, bolt circle, spigot diameter and thread size, and we will check the matching frame and shaft.

Is there a 4-pole motor for a PAM 63 input?

DRG's only model on frame 63 is 2-pole. The 4-pole 0.25 kW model is on frame 71 with a 14×30 mm shaft and a P 160 mm flange; these do not correspond to a PAM 63 input (11×23 mm shaft, P 140 mm).

Technical confirmation

DRG Motor is an electric motor manufacturer, supplier and seller; you source the gearbox, and we suggest the motor that corresponds to its input dimensions. Motors for worm gearboxes are grouped on the worm gearbox electric motor page, and ordering steps by shaft and frame are in the motor frame size order guide. Dimension drawings are available as 2D technical drawings and in the DRG technical and product catalogue. The fastest route: send a photo of the gearbox nameplate together with the input bore, key and flange dimensions.

Send a photo of your current motor nameplate and we will find the suitable DRG model together.Send on WhatsApp

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Electric Motors Related to This Topic — Models and Current Prices

Suitability is not decided by power alone: compare the speed, voltage, mounting, shaft and fixing dimensions of your machine with the product data; if unsure, send us the nameplate of your current motor.