FORD WA 971-2011 Dimensions Material and Physical Properties and Performance Requirements of Through Hardened and Carbon Restored POWERLOK and KLEERLOK Bolts with a Special Crest C.pdf
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1、 WORLDWIDE FASTENER STANDARD WA 971 Date: 2011 12 23 Copyright 2011, Ford Global Technologies, LLC Page 1 of 5 Dimensions, Material and Physical Properties and Performance Requirements of Through Hardened and Carbon Restored POWERLOKand KLEERLOK Bolts with a Special Crest Configuration 1. SCOPE This
2、 standard covers the dimensions, material and physical properties, and performance requirements of through hardened and carbon restored POWERLOKand KLEERLOK bolts with a special configuration at the crest of the threads which for Ford purposes shall be known as a “CREST INTERFERENCE” thread. As part
3、ial or complete decarburization of the thread or thread form seriously impairs the locking properties of the bolt, this condition is not permitted. Decarburization as permitted by ISO 898/1 is replaced in this standard by a requirement for carbon restoration as detailed in Clause 4.2. NOTE: These bo
4、lts are designed to be used in normal ISO metric threaded holes in the range M6 to M12 inclusive. 1.1 REFERENCE ISO 6157-3 Fasteners-Surface Discontinuities ISO 6507-1 Metallic Materials - Vickers Hardness, Part 1: Test Method ISO 898/1 Mechanical Properties of Fasteners - Part 1: Bolts, Screws and
5、Studs SAE/USCAR-8 Grain Flow Pattern for Bolts and Screws 2. DIMENSIONS The dimensions of the Crest Interference thread shall be as specified in Figure 1 and Table 1 prior to application of a protective coating. Parts already coated shall be checked with the protective coating removed. These parts s
6、hall be inspected and areas of thread damage avoided. Figure 1. See Note 2.3C PITCHa+1“C“ MajorActual3060Form as RolledThread CrestPOWERLOK Thread Form Profile“D“ Major “C“ MajorPOWERLOK KLEERLOKPrinted copies are uncontrolled WORLDWIDE FASTENER STANDARD WA 971 Date: 2011 12 23 Copyright 2011, Ford
7、Global Technologies, LLC Page 2 of 5 Printed copies are uncontrolled Table 1. Bolt Diameter and Pitch Nominal 1)C MajorD MajorPitch Diameter Cp Point Max. a 6.30 6.10 0.189 (M)6 x 1.00 6.15 5.95 6.00 0.100 8.35 8.10 0.227 (M)8 x 1.25 8.20 7.95 8.00 0.100 10.40 10.10 0.274 (M)10 x 1.50 10.25 9.95 10.
8、00 0.180 12.45 12.10 0.300 (M)12 x 1.75 12.30 11.95 The bolt pitch diameter measured atthe “C” lobes has dimensions that are Max. C = 4h max Min. C = 6g min. in accordance with ISO 965/3 12.00 0.230 1) NOTE: Although the designations for these bolts are M6, M8, etc., the thread form dimensions vary
9、from ISO metric threads. 2.1 Point Taper POWERLOK point tapered threads may be sharp crested or underfilled at the discretion of the manufacturer. KLEERLOK tapered lead threads as per shown in Fig. 1. 2.2 Method of Measurement The method of measuring the dimensions is at the discretion of the manufa
10、cturer but for referee purposes a direct measurement system shall be used. Tri-Roll gauges are necessary for the direct measurement of pitch diameter. 2.3 Minor Diameter Minor diameter must not interfere with 6H nut minor diameter. 3. MATERIALS Screws shall be made from cold heading quality fully ki
11、lled, fine grain, spherodized annealed steel wire. Material shall meet the chemical composition limits for PC10.9 per ISO 898 Part 1. 4. MECHANICAL PROPERTIES 4.1 BREAKING FORCE NOTE: POWERLOKand KLEERLOK screws have reduced tensile breaking loads as compared to ISO 898/1 due to reduced cross sectio
12、nal areas. See table 2 below. When tensile tested under wedge loading in line with ISO 898/1, the performance requirements identified in Table 2 must be met. Table 2. Size kN min. (M)6 x 1.00 19 (M)8 x 1.25 34 (M)10 x 1.50 55 (M)12 x 1.75 80 WORLDWIDE FASTENER STANDARD WA 971 Date: 2011 12 23 Copyri
13、ght 2011, Ford Global Technologies, LLC Page 3 of 5 Printed copies are uncontrolled Fracture shall occur in the threaded area, except for bolts with special heads which are weaker than the threaded section. The above requirements apply to head diameters up to 1.7d. For products with head diameter ab
14、ove 1.7d, the head may be machined to 1.7d prior to test. For products too short for tensile testing, a 6 head soundness test in accordance with ISO 898/1 will apply. 4.2 DECARBURIZATION During the hardening process the carbon potential of the atmosphere shall be maintained at a level slightly in ex
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