TAPTITE 2000® “SP”™ Fasteners have a shorter point than standard TAPTITE 2000® fasteners to maximize full thread engagement in blind holes, particularly in non-ferrous materials.
TAPTITE 2000® “SP”™ Fasteners are primarily used in aluminum and therefore are supplied with CORFLEX®-N heat treatment to minimize the potential of stress corrosion. When used in steel material, TAPTITE 2000® “SP”™ Fasteners can be ordered with the case hardened or CORFLEX®-I heat treatment.
TAPTITE 2000® HEAT TREATMENT
TAPTITE 2000® bolts perform well in large diameter sizes in deep thread engagements. In the past, the limitations of case-hardened products restricted the exploitation of in-place cost savings for larger diameter Trilobular™ fasteners. However, TAPTITE 2000® screws and bolts are available with 3 different types of heat treatment: CORFLEX®-I, CORFLEX® N, and case hardened, making the fasteners adaptable to a wider variety of applications.
CORFLEX®-I Heat Treatment – CORFLEX®-I TAPTITE 2000® bolts are neutral hardened to grade strength, metric 8.8, 9.8, 10.9 or any intermediate value. The thread forming zone is selectively induction hardened in order to form threads in untapped nuts.
CORFLEX®-I heat treatment allows TAPTITE 2000® thread rolling bolts to provide in-place cost savings in large structural applications with strength, ductility and toughness equal to grade strength machine screws or bolts. CORFLEX®-I heat treatment to Grade 10.9 level is standard for TAPTITE® 2000® bolts in sizes M6 (1/4″) and larger.
CORFLEX®-N Heat Treatment – CORFLEX®-N TAPTITE 2000® fasteners are neutral hardened to grade 10.9 strength level. CORFLEX®-N products are designed to be used in “soft white” metals such as aluminum or zinc alloys. CORFLEX®-N heat treatment can be specified for any size TAPTITE 2000® screws or bolts that are intended to be used in aluminum or zinc alloys.
Case Hardening – Case hardening is the standard heat treatment for all TAPTITE 2000® screws in sizes M5 (#12) and smaller.
The short point of the TAPTITE 2000® “SP”™ Fastener maximizes the amount of full thread engagement in blind holes. Increasing the full thread engagement is often critical in shallow depth holes. In many cases the failure mode can be shifted from internal thread stripping to fastener fracture, which is typically desired in castings. In deeper holes, the shorter “SP”™ point may allow a shorter fastener, saving weight and cost.