U. S. Patent and Trademark Office Fastener Insignia Register Active Insignias Oct 30, 2014 Status: Name: Insignia : Rockford Bolt Steel Co. 126 Mill Street Rockford IL … U. S. Patent and Trademark Office Fastener Insignia Register Active Insignias Apr 17, 2018 Status: Name: Insignia : Rockford Bolt Steel Co. 126 Mill Street Rockford IL … Manufacturer’s identification mark, e.g., “X” ( on head of bolts and screws and on one end of studs and stud bolts). ASTM A 307* Grade A Grade B Regular ‘series and Heavy Series A or B 67614 B only 67613 Galv. A or B 67614 Galv. B only 67615 Cad. Plated A only 67634 Cad.

Bolt Screw Head Markings and What They Mean. If you’ve ever spent any time looking at the heads of different fasteners , you’ve probably noticed that there are a wide variety of markings that may be stamped onto a fastener head . The markings can be numbers, letters, … In addition to the indicated grade. marking, all grades, except A563 grades O, A and B, must. be marked for manufacturer identification. The markings shown for all grades of. A194 nuts are for cold formed and hot forged nuts. When. nuts are machined from bar stock … IFI Fastener Technology Handbook US/Canada: $100.00 International : $100.hereprehensive, basic, and insightful information into fastener technology and fastener industry history.

Sep 02, 2010 SAE Grade 5 and Grade 8 with ' Fastener Quality Act' traceability -are- marked with manufacturer mark or name. The 'special' fasteners are also marked with manufacturer info. I -think- the THE is just a marking code from the BigBox stores to let the cashiers ring up the 'right' bolt size for pricing/inventory purposes. Determining Bolt Grades Understanding Head Markings The Nut and Bolt Solution Series. Identifying bolt grades and head markings for US grades 2, 5 and 8. Metric grades 8.8.,10.9 and 12.9 (socket products). Video 1: Determining Bolt Grade and Head Markings Markings of Screws. Identification with the manufacturer’s mark and the property class is mandatory for hexagon screws 3.6 to 12.9 and socket head cap screws 8.8 to 12.9 with thread diameter d 5mm, where the shape of the screw always allows it – preferably on the head .

FASTENER IDENTIFICATION MARKING . ASTM A563 -- Carbon and Alloy Steel Nuts. ASTM A194/A194M -- Carbon and Alloy Steel Nuts for Bolts for High Pressure and High Temperature Service. Often one will find extra marks on a bolt head--marks in addition to those shown above. Usually these marks indicate the bolt's manufacturer.