The catalog features the new GT®2 Series timing belt drives. GT®2 belts are as much as 7 dBA quieter than other types.A highlight of the catalog, identified as D265, is a comprehensive 169-page Technical Reference Section which covers in detail designing with and installing the new GT®2 belt drives. Other topics covered in detail include belt configurations, belt construction, belt tensioning, drive alignment, idler usage, and belt pull and bearing load considerations, etc. The catalog is divided into 4 product sections. Section 1 covers inch and metric timing belts which include the following Pitches: MXL, 40 DP, XL, L, 3 mm HTD, 5 mm HTD, T2.5, T5, T10, 2 mm GT®2, 3 mm GT®2, and 5 mm GT®2. Section 1 also includes timing belt stock, and belt tension tester products. Section 2 and 3 features over 9,400 inch and metric timing belt pulleys which are stocked in the following 5 materials: steel, aluminum, polycarbonate, acetal, and nylon. The newly patented Shaftloc® rotating component fastening device, consisting of a simple to use 2 part collet lock is featured in this section. Section 4 covers both inch and metric timing pulley stock and flanges.

	Introduction
	Part Number Index
	Reference Tableection 1 • GEARS
T-0	TECHNICAL SECTION
T-3	Introduction
T-6	Comparative Graphs
T-8	Drive Comparative Graphs
T-10	Belt Configurations & Construction
T-15	Belt Tooth Profiles
T-16	Pulley Pitch & Outside Diameters
T-42	Design & Installation Suggestions
T-50	Belt Tensioning & Alignment
T-56	Idler Usage
T-58	Belt Pull & Bearing Loads
T-61	Standards Applicable to Belts
T-63	Standards Applicable to Pulleys & Flanges
T-69	Double-Sided Twin Power® Belt Tolerance
T-70	Long Length Timing Belt Stock Specifications
T-71	Design Aids on Internet | www.sdp-si.com
T-72	Drive Ratio Tables
T-79	Center Distance Formulas
CENTER DISTANCE FACTOR TABLES (N1-N2 = 1 to 70)
T-82	NB-N1 = 1 to 24
T-84	NB-N1 = 25 to 48
T-86	NB-N1 = 49 to 72
T-88	NB-N1 = 73 to 96
T-90	NB-N1 = 97 to 120
T-92	NB-N1 = 121 to 144
T-94	NB-N1 = 145 to 168
T-96	NB-N1 = 169 to 192
T-98	NB-N1 = 193 to 216
T-100	NB-N1 = 217 to 240
T-102	NB-N1 = 241 to 264
T-104	NB-N1 = 265 to 288
T-106	NB-N1 = 289 to 312
T-108	NB-N1 = 313 to 336
T-110	NB-N1 = 337 to 360
T-112	NB-N1 = 361 to 384
CENTER DISTANCE FACTOR TABLES (N1-N2 = 71 to 140)
T-114	NB-N1 = 1 to 24
T-116	NB-N1 = 25 to 48
T-118	NB-N1 = 49 to 72
T-120	NB-N1 = 73 to 96
T-122	NB-N1 = 97 to 120
T-124	NB-N1 = 121 to 144
T-126	NB-N1 = 145 to 168
T-128	NB-N1 = 169 to 192
T-130	NB-N1 = 193 to 216
T-132	NB-N1 = 217 to 240
T-134	NB-N1 = 241 to 264
T-136	NB-N1 = 265 to 288
T-138	NB-N1 = 289 to 312
T-140	NB-N1 = 313 to 336
T-142	NB-N1 = 337 to 360
T-144	NB-N1 = 361 to 384
T-146	Timing Belt Drive Selection Procedure
T-168	List of Tables & Figures
1-1	Section 1 • TIMING BELTS
1-3	MXL - .080" (2.03 mm) Pitch
1-10	40 D.P. - .0816" (2.07 mm) Pitch
1-14	XL - 1/5" (5.08 mm) Pitch
1-20	L - 3/8" (9.525 mm) Pitch
1-23	HTD ® 3 - 3 mm (.118") Pitch
1-27	HTD ® 5 - 5 mm (.197") Pitch
1-31	T2.5 - 2.5 mm (.098") Pitch
1-32	T5 - 5 mm (.197") Pitch
1-34	T10 - 10 mm (.394") Pitch
1-36	GT®2 - 2 mm (.079") Pitch
1-37	GT®2 - 3 mm (.118") Pitch
1-38	GT®2 - 5 mm (.197") Pitch
1-39	Timing Belt Stock
1-42	Belt Tension Testers
2-1	Section 2 • TIMING PULLEYS (INCH)
2-3	MXL - .080" Pitch
2-14	40 D.P. - .0816" Pitch
2-26	XL - 1/5" Pitch
2-58	L - 3/8" Pitch
2-65	HTD ® 3 - 3 mm Pitch
2-77	HTD ® 5 - 5 mm Pitch
2-94	GT®2 - 2 mm Pitch
2-100	GT®2 - 3 mm Pitch
2-107	GT®2 - 5 mm Pitch
3-1	Section 3 • TIMING PULLEYS (METRIC)
3-3	MXL - 2.03 mm Pitch
3-14	40 D.P. - 2.07 mm Pitch
3-20	XL - 5.08 mm Pitch
3-39	L - 9.525 mm Pitch
3-42	HTD ® 3 - 3 mm Pitch
3-53	HTD ® 5 - 5 mm Pitch
3-67	T2.5 - 2.5 mm Pitch
3-69	T5 - 5 mm Pitch
3-71	GT®2 - 2 mm Pitch
3-77	GT®2 - 3 mm Pitch
3-84	GT®2 - 5 mm Pitch
4-1	Section 4 • TIMING PULLEY STOCK & FLANGES
4-3	MXL - .080" (2.03 mm) Pitch
4-6	40 D.P. - .0816" (2.07 mm) Pitch
4-8	XL - 1/5" (5.08 mm) Pitch
4-12	L - 3/8" (9.525 mm) Pitch
4-14	HTD ® 3 - 3 mm (.118") Pitch
4-19	HTD ® 5 - 5 mm (.197") Pitch
4-24	T2.5 - 2.5 mm (.098") Pitch
4-26	T5 - 5 mm (.197") Pitch
4-28	T10 - 10 mm (.394") Pitch
4-30	GT®2 - 2 mm (.079") Pitch
4-33	GT®2 - 3 mm (.118") Pitch
4-36	GT®2 - 5 mm (.197") Pitch
A-0	ALPHABETICAL INDEX