Standard Steel

Wheels

STANDARD AAR WHEEL TYPES - WIDE FLANGE CONTOUR – FOR FREIGHT CAR SERVICE - CARBON STEEL (M-107/M-208)
AAR Type	J-33	M-33	P-33	H-36	J-36	K-36	B-38	C-38
Status Date	STND 1956	STND 1961	STND 1984	STND 1962	STND 1962	STND 1962	STND 1964	STND 1964
Effective Date	1968	1968	1985	1972	1968	1968	1973	1968
Tread Type	1-W	2-W	M-W	1-W	2-W	M-W	1-W	2-W
Intended Axle Class	5½ x 10 6 x 11	5½ x 10 6 x 11	5½ x 10 6 x 11 6½ x 12 7 x 12	6½ x 12 6½ x 9	6½ x 12 6½ x 9	6½ x 12 6½ x 9	7 x 12	7 x 12
Max. Cap. Per Wheel LBS.	27,500	27,500	32,875	35,750	35,750	35,750	39,375	39,375

DIMENSION AND TOLERANCES - ALL ENTRIES IN INCHES, EXCEPT TAPES
D	33 + 14 TAPES (5% -5)	33 + 14 TAPES (5% -5)	33 + 14 TAPES (5% -5)	36 + 14 TAPES (5% -5)	36 + 14 TAPES (5% -5)	36 + 14 TAPES (5% -5)	38 + 14 TAPES (5% -5)	38 + 14 TAPES (5% -5)
G (MIN)	1 ¼	2	2 ½	1 ½	2	2 ½	1 ½	2
Rim Width	5 23/32 ± ⅛	5 23/32 ± ⅛	5 23/32 ± ⅛	5 23/32 ± ⅛	5 23/32 ± ⅛	5 23/32 ± ⅛	5 23/32 ± ⅛	5 23/32 ± ⅛
N (MIN)	⅝	⅝	¾	¾	¾	¾	⅞	⅞
O1	+1 10 ⅝ -0	+1 10 ⅝ -0	+1 11 ⅞ -0	+1 11 ⅛ -0	+1 11 ⅛ -0	+1 11 ⅛ -0	+1 12 ⅛ -0	+1 12 ⅛ -0
O2	+1 10 ⅝ -0	+1 10 ⅝ -0	+1 11 ⅞ -0	+1 11 ⅛ -0	+1 11 ⅛ -0	+1 11 ⅛ -0	+1 12 ⅛ -0	+1 12 ⅛ -0
Max Finish Bore	8 ⅜	8 ⅜	9 ⅝	8 ⅞	8 ⅞	8 ⅞	9 ⅝	9 ⅝
Min Hub Wall	1 ⅛	1 ⅛	1 ⅛	1 ⅛	1 ⅛	1 ⅛	1 ¼	1 ¼
R1	7 ± ¼	7 ± ¼	7 ± ¼	7 ± ¼	7 ± ¼	7 ± ¼	7 ± ¼	7 ± ¼
R2	2 ½ ± ⅛	2 ½ ± ⅛	2 ½ ± ⅛	2 ½ ± ⅛	2 ½ ± ⅛	2 ½ ± ⅛	2 ½ ± ⅛	2 ½ ± ⅛

The key for these meaurements is available here.

Locomotive Wheels

STANDARD AAR WHEEL TYPES - NARROW FLANGE CONTOUR - FOR DIESEL LOCOMOTIVE
AAR Type	E-40	A-41	A-43	D-42	E-42
Status Date	STND 1982	STND 1997	STND 1997	STND 1997	STND 1997
Effective Date	3/1/83	1997	1997	1997	1997
Tread Type	M-W*	M-W*	M-W*	M-W	M-W
Intended Service	Diesel Loco.	Diesel Loco.	Diesel Loco.	Diesel Loco.	Diesel Loco.

DIMENSIONS AND TOLERANCES - ALL ENTRIES IN INCHES, EXCEPT TAPES
D	40" Tapes +14 -0	41" Tapes +14 -0	43" Tapes +14 -0	42" Tapes +14 -0	42" Tapes +14 -0
G (min)	2½	3	3	2½	3½
Rim Width	5 23/32 ± ⅛ (5 ½ ± ⅛ alternate)	5 23/32 ± ⅛ (5 ½ ± ⅛ alternate)	5 23/32 ± ⅛ (5 ½ ± ⅛ alternate)	5 23/32 ± ⅛ (5 ½ ± ⅛ alternate)	5 23/32 ± ⅛ (5 ½ ± ⅛ alternate)
N (min)	1	1	1	1	1
O1	12 ½ ± ⅛	12 ½ ± ⅛	12 ½ ± ⅛	12 ½ ± ⅛	12 ½ ± ⅛
O2	13 ¼ ± ⅛	13 ¼ ± ⅛	13 ¼ ± ⅛	13 ¼ ± ⅛	13 ¼ ± ⅛
P	6 ½ ± ⅛	6 ½ ± ⅛	6 ½ ± ⅛	6 ½ ± ⅛	6 ½ ± ⅛
R1	4 13/16 ± ⅛	4 13/16 ± ⅛	4 13/16 ± ⅛	4 13/16 ± ⅛	4 13/16 ± ⅛
R2	1 11/16 f	1 11/16 f	1 11/16 f	1 11/16 f	1 11/16 f
Max Finish Bore	9 15/16	9 15/16	9 15/16	9 15/16	9 15/16
Min Hub Wall	** 1 ⅛	1 ⅛	1 ⅛	1 ⅛	1 ⅛

Note: Where dimension R2 is marked "f", extra stock of 1/16" to 3/16" over specified dimension may be left for machining of each finished surface or wheel may be furnished finished to exact dimension shown. Hub length tolerance is based on
finished dimension.

* Reference Groove Required - See AAR RP-619
** Hub wall thickness may be reduced as necessary for application of roller bearing water guard.

Passenger Wheels

Standard Steel currently manufactures a variety of types and sizes wheels for the passenger/transit markets. Full specifications and quotes are available by contacting a sales representative.