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(888) 312-8812 Login SignupFine threads take more turns per inch than coarse ones, and the Allison Transmission Bolt puts that grip into a 1/2-20 fastener. Fine pitch also allows more precise tightening, because each turn advances the bolt a smaller distance. At 2.75 inches long, it reaches deep enough into the mating part to use all that thread grip. That pitch and reach are what the Allison Transmission 29536847 brings to a joint built for them.
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