Weld Screws, Weld Nuts, Clinch Studs

Transcription

1 Weld Screws, Weld Nuts, Clinch Studs imensions; Mechanical & Performance Requirements Weld Screws Top Projection Style... 2 ottom Projection Style... 3 Weld Nuts Single Projection... 4 Multiple Projection... 5 Self-Clinching Studs, Flush-Head

2 Weld Screws Top Projection Style P W H L Length of weld studs is measured from the welding surface of the head to the end of the shank, excluding the projections. STEEL WEL SCREWS WITH TOP PROJECTIONS Ohio Nut & olt* Nominal or asic Screw iameter Threads per Inch H P W Head iameter Head Height Projection Height Projection Width Max Min Max Min Max Min Max Min / Tolerance on Length Up to 1 in., Incl.: WEL SCREWS WITH TOP PROJECTIONS -PRT NUMER COMPRISON 6-32 x 1/4 GW x 3/8 GW x 3/8 GW x 3/8 GW1606 1/4-20 x 3/8 GW x 3/8 GW x 1/2 GW x 1/2 GW x 1/2 GW1608 1/4-20 x 1/2 GW x 1/2 GW x 5/8 GW x 5/8 GW x 5/8 GW1610 1/4-20 x 5/8 GW x 5/8 GW x 3/4 GW x 3/4 GW x 3/4 GW1612 1/4-20 x 3/4 GW x 3/4 GW x 1 GW x 1 GW x 1 GW1616 1/4-20 x 1 GW x 1 GW Tensile Strength Length of Thread Finish fastener with unified thread pitch and a cylindrical, low profile head with tlat parallel surfaces. The top of the head has three hemispheroidal-shaped weld projections equally spaced on a locating circle concentric with the shank. Enables a threaded fastener to become a permanent, integral part of an assembly. The top projection style is preferred when a smooth, finished appearance on the outer surface is desired. C or equivalent welding quality carbon steel 60,000 psi., minimum Studs with nominal lengths of 2 inches or less should have threads extend to within one thread of the top of the weld projections. Studs over 2 inches should have a minimum thread length of 1.75 inches. * is the original writer of these weld screw specifications. Weld screws are supplied with a plain, unplated finish to facilitate welding.

3 ottom Projection Style Weld Screws P H L W Length of weld studs is measured from the welding surface of the head to the end of the shank, excluding the projections. STEEL WEL SCREWS WITH OTTOM PROJECTIONS Ohio Nut & olt* Nominal or asic Screw iameter Threads per Inch H P W Head iameter Head Height Projection Height Projection Width Max Min Max Min Max Min Max Min / Tolerance on Length Up to 1 in., Incl.: WEL SCREWS WITH OTTOM PROJECTIONS -PRT NUMER COMPRISON 6-32 x 1/4 HW x 3/8 HW x 3/8 HW x 3/8 HW1606 1/4-20 x 3/8 HW x 3/8 HW x 1/2 HW x 1/2 HW x 1/2 HW1608 1/4-20 x 1/2 HW x 1/2 HW x 5/8 HW x 5/8 HW x 5/8 HW1610 1/4-20 x 5/8 HW x 5/8 HW x 3/4 HW x 3/4 HW x 3/4 HW1612 1/4-20 x 3/4 HW x 3/4 HW x 1 HW x 1 HW x 1 HW1616 1/4-20 x 1 HW x 1 HW1116 Tensile Strength Length of Thread Finish fastener with unified thread pitch and a cylindrical, low profile head with flat parallel surfaces. The underside of the head has three hemispheroidal-shaped weld projections equally spaced on a locating circle concentric with the shank. Enables a threaded fastener to become a permanent, integral part of an assembly. The bottom projection style can assemble into a prelocated hole and is stronger than the top projection style, utilizing the full head strength of the fastener. C welding quality carbon steel 60,000 psi., minimum Studs with nominal lengths of 2 inches or less should have threads extend to within one thread of the top of the weld projections. Studs over 2 inches should have a minimum thread length of 1.75 inches. Weld screws are supplied with a plain, unplated finish to facilitate welding. * is the original writer of these weld screw specifications. 233

4 Weld Nuts Single Projection K 7/64 pprox. C E F T WEL NUTS -SINGLE PROJECTION C K E F Gripco Width Length Thickness Center of Pilot Hole to Outside of Rounded Edge Pilot Height Pilot Outside iameter Pilot Hole iameter Projection Height / / / four-sided, internally threaded fastener with rounded edges at the two ends most opposite each other. The threaded hole is set off to one side and has a pilot for the entire circuference of the opening which extends above the flat surface of the nut. Next to this opening is a single, round, dome-shaped protrusion of a lesser height than the pilot. Preferred over other styles of weld nuts when working with heavier gage material. The large, single projection gives a deeper weld than possible with smaller projections. The height of the pilot minimizes the amount of welding residue that could clog the threads Low Carbon Steel 234

5 Multiple Projection Weld Nuts C E F T WEL NUTS -MULTIPLE PROJECTIONS Gripco C E F Width Length Thickness Pilot Height Pilot Outside iameter Pilot Hole iameter Projection Height / / / / four-sided, internally threaded fastener with rounded edges at the two ends most opposite each other. The threaded hole runs through the center and has a pilot for the entire circuference of the opening which extends above the flat surface of the nut. Surrounding the hole in the four corners and on the same side of the nut as the pilot, are four identical round, dome-shaped protrusions of less height than the pilot. The four projections are designed to weld simultaneously, covering a greater area than single projection nuts to achieve maximum weld strength. The height of the pilot minimizes the amount of welding residue that could clog the threads Low Carbon Steel 235

6 Self-Clinch Studs 12-Rib Style Flush Head STEEL SELF-CLINCHING STUS - 12-RI STYLE WITH NNULR GROOVE Crescent Manufacturing Thread Head iameter Unthreaded Length Minimum Sheet Thickness Hole in Sheet (+.003, -.000) istance to Center of Hole in Panel Max Min Max Min Push-Out (lbs.) Torque-Out (In.-lbs.) (ased on.060 steel plates) Estimate of Installation Force in Steel (lbs.) pprox / Tolerance on Length ±.015 Heat Treatment Case Hardness fastener with unified thread pitch and a cylindrical, low profile head with small, rectangular ribs protruding from the underside of the head. The top of the head is flat and is flush with the mating surface when installation is complete. elow the ribs and above the first thread is an annular groove which helps to hold the fastener in position. Intended for metal panel-to-panel applications and well-suited for use in printed circuit boards. hole is pierced into the circuit board and the unit it is attached to. The stud is inserted using a hand press or by hand, applying parallel squeezing forces. hex nut is twisted onto the stud, securing it from the back. s the nut is tightened, the ribbed stud head grips the front panel to secure the application from the front as well, eliminating the need for welding. s the application force is applied, part of the sheet cold flows into an undercut under the head, making the fastener an integral part of the sheet. Low carbon steel Clinch studs shall be case hardened, oil quenched and tempered. Rockwell C 45 minimum Core Hardness Rockwell C Plating See ppendix- for plating information. 236

7 Flush Head 12-Rib Style Self- Clinch Studs 45 T THIN SHEET NVIL Intended for panels less than in thickness, with #4 thru #10 thread sizes, inclusive. lso, for panels less than in thickness with 1/4 thread size. T THICK SHEET NVIL Intended for panels and greater in thickness, with #4 thru #10 thread sizes, inclusive. lso, for panels and greater in thickness with 1/4 thread size. STU PRESS SHEET NVIL IMENSIONS nvil Thread T & / NVIL Notes on Installation: pply only sufficient squeezing pressure to embed head of stud flush with panel. o not use more pressure than necessary. mount of pressure varies with panel material and size of stud. Studs install flush in sheets.040 or thicker but will project up to.020 in thinner sheets. FLUSH HE CLINCH STU -PRT NUMER COMPRISON PEM PEM PEM 4-40 x 1/4 FH x 1/4 FH x 3/8 FH x 5/16 FH x 5/16 FH x 1/2 FH x 3/8 FH x 3/8 FH x 5/8 FH x 1/2 FH x 1/2 FH x 3/4 FH x 5/8 FH x 5/8 FH x 7/8 FH x 3/4 FH x 3/4 FH x 1 FH x 1/4 FH x 7/8 FH x 1 1/4 FH x 5/16 FH x 1 FH x 1 1/2 FH x 3/8 FH x 1 1/4 FH /4-20 x 1/2 FH x 1/2 FH x 3/8 FH /4-20 x 5/8 FH x 5/8 FH x 1/2 FH /4-20 x 3/4 FH x 3/4 FH x 5/8 FH /4-20 x 7/8 FH x 7/8 FH x 3/4 FH /4-20 x 1 FH x 1 FH x 7/8 FH /4-20 x 1 1/4 FH x 1 1/4 FH x 1 FH /4-20 x 1 1/2 FH x 1 1/4 FH x 1 1/2 FH