Machinery's Handbook, 31st Edition
STRAIGHT PINS 1887 Table 4. American National Standard Chamfered and Square End Straight Pins ANSI/ASME B18.8.2-2000 (R2010) L 25° L
C
A
A
Break corners to .003 – .015 radius or chamfer SQUARE END STRAIGHT PIN
Contour of chamfer surface optional
CHAMFERED STRAIGHT PIN
Pin Diameter, A
Chamfer Length, C
Pin Diameter, A
Chamfer Length, C
Nominal Size a or Basic Pin Diameter
Nominal Size b or Basic Pin Diameter
Max.
Min.
Max.
Min. 0.005 0.00 0.005 0.005 0.005 0.005 0.005
Max.
Min.
Max.
Min. 0.020 0.020 0.020 0.020 0.035 0.035 0.035
0.062 0.0625 0.0605 0.025 0.094 0.0937 0.0917 0.025 0.109 0.1094 0.1074 0.025 0.125 0.1250 0.1230 0.025 0.156 0.1562 0.1542 0.025 0.188 0.1875 0.1855 0.025 0.219 0.2187 0.2167 0.025 0.250 0.2500 0.2480 0.025
5 ∕ 16 0.312 0.3125 0.3105 0.040 3 ∕ 8 0.375 0.3750 0.3730 0.040 7 ∕ 16 0.438 0.4375 0.4355 0.040 1 ∕ 2 0.500 0.5000 0.4980 0.040 5 ∕ 8 0.625 0.6250 0.6230 0.055 3 ∕ 4 0.750 0.7500 0.7480 0.055 7 ∕ 8 0.875 0.8750 0.8730 0.055
1 ∕ 16 3 ∕ 32 7 ∕ 64
1 ∕ 8
5 ∕ 32 3 ∕ 16 7 ∕ 32
0.005 1 1.000 1.0000 0.9980 0.055 0.035 a Where specifying nominal size in decimals, zeros preceding decimal point are omitted. b Where specifying nominal size in decimals, zeros preceding decimal point are omitted. All dimensions are in inches.
1 ∕ 4
Length Increments: Lengths are as specified by the purchaser; however, it is recom mended that nominal pin lengths be limited to increments of not less than 0.062 inch. Material: Straight pins are normally made from cold drawn steel wire or rod having a maximum carbon content of 0.28 percent. Where required, pins may also be made from corrosion resistant steel, brass, or other metals. Designation: Straight pins are designated by the following data, in the sequence shown: Product name (noun first), nominal size (fraction or decimal equivalent), material, and protective finish, if required. Examples: Pin, Chamfered Straight, 1 ∕ 8 × 1.500, Steel Pin, Square End Straight, 0.250 × 2.250, Steel, Zinc Plated American National Standard Taper Pins.— Taper pins have a uniform taper over the pin length with both ends crowned. Most sizes are supplied in commercial and precision classes, the latter having generally tighter tolerances and being more closely controlled in manufacture. Diameters: The major diameter of both commercial and precision classes of pins is the diameter of the large end and is the basis for pin size. The diameter at the small end is com puted by multiplying the nominal length of the pin by the factor 0.02083 and subtracting the result from the basic pin diameter. See also Table 5. Taper: The taper on commercial class pins is 0.250 ± 0.006 inch per foot and on the pre cision class pins is 0.250 ± 0.004 inch per foot of length. Materials: Unless otherwise specified, taper pins are made from SAE 1211 steel or cold drawn SAE 1212 or 1213 steel or equivalents, and no mechanical property requirements apply. Hole Sizes: Under most circumstances, holes for taper pins require taper reaming. Sizes and lengths of taper pins for which standard reamers are available are given in Table 6. Drilling specifications for taper pins are given below.
Copyright 2020, Industrial Press, Inc.
ebooks.industrialpress.com
Made with FlippingBook - Share PDF online