ASME B18.10-2006 pdf – Track Bolts and Nuts.
2.2 Necks
Types of track bolts are designated as “oval neck and “elliptic neck.”
2.3 Body Diameters
This Standard prs ides for two styles of body dianwters. Bolts shall be provided with a full size body m accordance with the respective table dimensions of Table 1 or 2 for body diameter, E, unless a reduced body diameter is specified on the purchase order. These shall have a body diameter not less than the minimum pitch diameter of the thread and not exceeding the minimum body diameter, E, shown in Table 1 or 2.
2.4 Bolt Length
The bolt length shall be the distance measured parallel to the axis of the product from the bearing surface of the head to the extreme end of the bolt, including the point lithe product is pointed.
2.5 Threads
Bolt threads shall be rolled unless otherwise agreed to between the purchaser and the supplier.
Threads shall be Unified Inch Series, Class 2A as spedtied in respective dimensional tables in ASME B1.1
2.5.1 Thread Acceptance Gaging. Unless otherwise specified, dimensional acceptability of screw threads shall be determined based on System 21, ASME lil.3M.
2.6 Thread Length
The length of thread shall be measured parallel to the axis of the bolt from the end of the bolt to the last complete (fully formed) thread. The minimum thread length, L1. shall be as shown in Tables I and 2. The tolerance on thread length shall be + 0.187 in. or 2.5 X pitch, whichever is greater. Bolts of nominal lengths tno short to accommodate the minimum thread lengths shall be threaded full length. The distance from the neck to the first complete (full form) thread shall not exceed 2’4 threads for sizes up to and including I in. and 3 threads for sizes over I in.
2.7 PoInted Products
Unless otherwise specified, bolts need not be pointed. When pointed, the first full formed thread at a major diameter is located at a distance no greater than 2 times th pitch measured from the end of the screw. This distance is to be determined by measuring how far the point enters into a cylindrical NOT GO major diameter ring gage.
2.8 StraIghtness
Shanks of bolts shall be straight within the following limits at Maximum Material Condition (MMC). For bolts with nominal lengths up to and including 12 in., the maximum camber shall be 0006 in. per inch (O.006L) of bolt length. For bolts having a full diameter bod a typical gage and gaging procedure for checking bolt straightness is given in Appendix I of ASME 618.2.1. For bolts with an undersized body. the gaging method shall be the sleeve gage shown in Appendix II of ASME
611121.
2.9 Track Bolt Nuts
Track bolt nuts shall be dimensionally In accordance with ASME 618.2.2. Selected sizes are included in Table 3.
2.10 FInish
Unless otherwise specified, bolts and nuts shall he supplied with a plain (as processed> finish, unplated or uncoated.
2.11 WorkmanshIp
Bolts and nuts shall be visually. without magnification, free train burrs, seams, laps, loose scales, irregular surfaces, and any defects affecting their serviceability.
When control of surface discontinuities for bolts Is required, the purchaser shall specify conformance to
ASTM F 78$/F 78$M.
When control of surface disconrinuitics for nuts is required. the purchaser shall specify conformance to
ASTM F 812/F 12M.
2.12 DesignatIon
Bolts and nuts shall be designated by data in the following sequences as shown:
Ia) product name
(b) nominal size (fractional or decimal equivalent)
(C) threads per inch
(di product length (fractional or two-place decimal equivalent)
(e) material, including specification where necessary
(f) protective finish ii required
Sec the following examples:
F.XAMI’l.FS:
(1) Osal neck track bull. ASME 618.10, ‘4—9 X 2’4. steel ASTh4 A 449. Type 3. plain liniái
(2) Heavy square nut. ASMF 618.10, ‘4-9. steel. ASIN A 563. Grade 1)1-I, plain finish
2.13 Identification Symbols
2.13.1 Grade Symbols. Each track bolt and track nut shall be marked in accordance with its material. mechanical, or performance requirements.
2.13.2 Source Symbols. All track bolts and track nuts shall be marked to identify the manufacturing source using a mark registered with U.S. Patent arid Trademark Office in accordance with the Fastener Qualitve Act.