Difference between revisions of "Grade Markings for Steel Fasteners"
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(Created page with "Bolt Grade Markings and Tensile Strength - SAE and ASTM. * Bolts,Screws,Studs with 3 symmetrical tick marks on the head = Grade 5 * Bolts,Screws,Studs with 5 symmetrical tick...") |
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| + | Bolts (non-metric) and all fasteners are made to meet certain strength requirements and have a grade or ASTM rating. Special markings on screw heads and nuts identify the fastener's grade. Bolts and screws have a grade and manufacturer identification marking. Screws and bolts above 1/4" are typically marked on the top of their head unless Grade 2. | ||
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Bolt Grade Markings and Tensile Strength - SAE and ASTM. | Bolt Grade Markings and Tensile Strength - SAE and ASTM. | ||
| − | * Bolts,Screws,Studs with 3 symmetrical tick marks on the head = Grade 5 | + | * Bolts,Screws,Studs with no tick marks on the head = Grade 2 |
| − | * Bolts,Screws,Studs with 5 symmetrical tick marks on the head = Grade 7 | + | * Bolts,Screws,Studs with 3 symmetrical tick marks spaced 120° on the head = Grade 5 |
| + | * Bolts,Screws,Studs with 5 symmetrical tick marks spaced 72° on the head = Grade 7 | ||
| + | * Bolts,Screws,Studs with 6 symmetrical tick marks spaced 60° on the head = Grade 8 | ||
Revision as of 18:14, 10 June 2019
Bolts (non-metric) and all fasteners are made to meet certain strength requirements and have a grade or ASTM rating. Special markings on screw heads and nuts identify the fastener's grade. Bolts and screws have a grade and manufacturer identification marking. Screws and bolts above 1/4" are typically marked on the top of their head unless Grade 2.
Bolt Grade Markings and Tensile Strength - SAE and ASTM.
- Bolts,Screws,Studs with no tick marks on the head = Grade 2
- Bolts,Screws,Studs with 3 symmetrical tick marks spaced 120° on the head = Grade 5
- Bolts,Screws,Studs with 5 symmetrical tick marks spaced 72° on the head = Grade 7
- Bolts,Screws,Studs with 6 symmetrical tick marks spaced 60° on the head = Grade 8
