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Technical Specification

Product	Bolt c/w Flat & Spring Washer SEM
Head Type	Hex
Pre-Assembled with Washers	Spring & Flat Washer to suit
Bolt Size	Choose from the dropdown above
Thread Pitch	M5 = 0.80mm, M6 = 1.00mm, M8 = 1.25mm
Thread Type	Metric - Coarse
Length - measure from under the head	Choose from the dropdown above
Thread Length	Full Thread
Bolt Diameter APPROX	M5 = 4.82 - 5.00mm, M6 = 5.70 - 6.00mm, M8 = 7.70 - 8.00mm
Across Flats APPROX	M5 = 7.73 - 8.00mm, M6 = 9.73 - 10.00mm, M8 = 12.73 - 13.00mm
Spanner Size	M5 = 8mm, M6 = 10mm, M8 = 13mm
Across Corners APPROX	M5 = 8.79mm, M6 = 10.91mm, M8 = 13.91mm
Head Height APPROX	M5 = 3.47mm, M6 = 3.85mm, M8 = 4.58mm
Drive Type	M5 & M6 = PH2, M8 = PH3
Material	Mild Steel
Class	Class 4.6
Finish	Zinc Yellow
Brand	Fasteners Galore
Pack Quantity	Choose from the dropdown above

Product Information

Hex Bolt c/w Flat & Spring Washer SEM Mild Steel Class 4.6 Zinc Yellowis a called a SEM because of the bolt combination with a permanently attached washer or set of washers. It is also referred to as captivated washers, screw/bolt-washer assemblies or combi bolts. The word SEMS originates from The Illinois Tool Works Inc., who made machines that produced pre-asSEMbled washers and screws. In spite of the original patents and trademarks, the word SEMS is generally recognised as a generic term applicable to screw and washer assemblies. The washers are installed on the bolt blank before thread rolling. Since the outer diameter of the threads becomes larger than the inner diameter of the washers, the washers are prevented from prising loose from the bolt. It is normally possible for the washer/washers to slide on the non-threaded part of the bolt.Zinc Yellow plated refers to the colour of the chromate that is applied after zinc has been applied. Yellow chromate increases the overall protection of the finish. Commonly used in the automotive industry. The coating is intended to be used internally as it only offers an average level of protection against corrosion
Imperial fastenings are referred to as grades, and metric fastenings are referred to as classes. Both have marking systems that make it possible to determine grade and class. An example is a ½” UNC bolt with 5 lines on the head is grade 8 and 3 lines is grade 5, both are regarded as high tensile. Metric bolts are slightly different, if it has 4.6 then it is mild steel and 8.8 is high tensile. The markings on a stainless fastener indicate the grade of material and strength, e.g. material G304 grade will have one of the following markings: A2-70, G304, A2, 304 and G316 grade stainless will have one of the following: A4-70, G316, A4, 316
Pitch means the distance between the peaks of two threads along a screw, bolt, or fastener expressed in millimetres (mm). Used when referring to Metric parts. For example, a thread pitch of 1.50mm means that the distance between one thread and the next is 1.50mm
Fastener length is generally measured from the point where the surface of the material will be when the fastener is installed to the end of the fastener. Thus, fasteners with heads that sit above the surface are measured from under the head to the end of the fastener, while fasteners that sit flush with the surface are measured from the top of the head to the end of the fastener
Every effort has been made to ensure all measurements on our site are accurate and to the relevant standard, they should only be used as a guide
Our stock is sourced from various suppliers, therefore differences may exist between batches such as head dimensions, visible stamped head markings, appearance or actual finish
Photos are of the product but may not be the actual diameter, head size or length you may require, always refer to the size in the description and additional specifications data provided prior to ordering
Note: Technical data and specifications were researched and compiled from numerous industry sources for the sole purpose of providing basic information. All material is advisory only and its use by anyone is entirely voluntary. Reliance on it for any purpose by anyone is at the sole risk of that person, and Bolt and Nut Australia is not responsible for any loss, claim or damages arising therefrom. In developing this information, Bolt and Nut Australia has made a determined effort to present it accurately
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