Installation- and Operating Instructions

Important Information About Bolts and Torques

Bolt Diameter

· Stock thread holes commonly are 7/16” 20 UNF. Therefore, all SCHROTH models come with bolts and eye-bolts matching this dimension.

· A few chassis are manufactured with 15/32” or ½” thread holes at the inner [centre tunnel] anchorages. See the section “Brackets” for those thread holes that accept 15/32” or ½” bolts.

· Individually made chassis and roll cages often use other dimensions, which vary from 8 mm or 5/16” [mostly for anti-submaring strap installation] to 10 mm or 3/8” in diameter for lap- and shoulder belt installation.

· Eye-bolts for 10 mm thread holes [P/N SG 35] are available at your SCHROTH-dealer or importer.

· For all other dimensions you must provide the correct bolt diameter, type of thread and bolt length.

Bolts not supplied by SCHROTH must be of grade 8.8 at a minimum.

1. Bolts must fit to the thread dimension of the anchorage chosen.

2. Bolts must be long enough to fill the thread hole completely with all bushings, spring washers, spacers etc. in place for installation.

3. Bolts must be of correct length and must not to intrude into the fuel tank or damage any other components of the car in which they are installed.

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Tightening Torques by Bolt Dimension

· Each bolt diameter and type of thread requires an individual torque for proper tightening. These torques as listed below are defined by national or international standardisation organisations.

· For safe installation always tighten bolts to the recommended torque.

· For any installation use e.g. “Loctite 243” or spring washers where recommended to secure bolt fastening.

	M 8	5/16”	M 10	3/8”	7/16” 20 UNF	15/32”	1/2”
Torque in Nm	25	25	50	50	40	87	113
Torque in ft-lb	18,5	18,5	37	37	30	64,5	83,5

Creating a new attachment point

· Follow the recommendations for geometry and strap routing described on Pages 24 to 26 to define the proper anchor point location.

· FIA does not allow welding or drilling to roll cages, except those conducted and certified by the roll cage manufacturer. Only manufacturer specified roll cage bars must be used for racing harness installation.

· For new attachment points to the chassis heed the following WARNING box.

· For new attachment points to the chassis you must use a FIA specified reinforcement plate [see “Accessories & Spare Parts”].

· Drill a hole of 12 mm [15/32”] diameter for lap- & shoulder belt and

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· standard anti-sub strap attachments.

· Drill a hole of 8,5 mm [5/16”] diameter for anti-sub strap twin bracket anchorage point.

· Use seal compound and stick the reinforcement plate from underneath to the floor panel. The seal also helps to prevent water intrusion.

· Use SCHROTH supplied bolts and eyebolts only! They are tested for quality and fit to the threads provided by the SCHROTH reinforcement plate and to the SCHROTH brackets.