If you do not have a magnet you can still identify grade 8 bolts by brushing the head of the bolt using a wire brush and counting its radial lines. Hex bolt identification markings and strength chart table guide.
Aircraft Hardware Threaded Fasteners Part Two Bolts Part One
How to identify a bolt. There are six radial lines on the heads of grade 8 bolts. It also features a larger curved bottom metal surrounding the magazine well which is not only elegant but easy to identify as on an x bolt. If it takes eight screws to mount the bases it is an x bolt. It might have been wrong to refer to a cheat sheet in high school calculus class but nobody is going to blame you for not being able to identify all of the various types of fasteners screw heads drive types nut and washer styles available todayi ran into this fastener type chart created by bolt depot while trying to identify a mystery drive shape used to fasten a part i wanted to remove. 14 thru 4 na. Print this page.
In 1994 browning introduced the boss ballistic optimizing shooting system and with it the a bolt ii. Hex bolts will have 109 equivalent to sae grade 8 88 equivalent to sae grade 5 or no markings equivalent to sae grade 2. Additonal information on bolts is located at the bottom of the webpage. Type material diameter length and thread pitch or count machine thread fasteners only. We have most owners manuals online. Tensile strength psi 307a low carbon steel.
As you can see the thread pitch of the coarse metric bolt is much finer than a coarse thread standard bolt. Diameter is in either inches not decimal or millimeter. Hex bolt identification markings and strength chart. Look for bolt markings. Second measure the pitch pitch is threads per unit. The first two are 14 diameter and the last one is 6mm.
Information on how they are written can be found on our how fastener measurements are notated page. Identifying bolts by thread pitch. Proof load psi min. First measure the diameter. In the picture to the left you can see 3 bolts that look very similar at first glance when lying around your work bench. Grade 2 low or medium carbon steel.
Fasteners are identified by four or five attributes. Head marking grade and material nominal size range inches mechanical properties. For instance 10 x 110 109 would be a hex head capscrew 20 mm in diameter 110 mm long grade 109. Just remember that each scope base is held down by four screws four at the front and four at the back. Inches are measured threads per inches. Some bolts share identical head identification and have significantly different strengths.
Diameter and length are identified in millimeters. The a bolt ii model is currently in production. To determine the size of a bolt. How to identify a metric bolt. Bolt grade markings and strength chart. To determine the size of a bolt.
Metric are measured thread per millimeter. Yield strength psi min. This page describes what these attributes represent. To find your serial number you will need to refer to your owners manual. Length is measured from under the head. You identify grade by looking at the head of the bolt.
The browning ab3 stalker rifle.
Gallery of How To Identify A Bolt
