All AMPG Shoulder Screws are Precision Made
AMPG has assembled the most complete line of nonferrous shoulder screws manufactured in North America. Each shoulder bolt is made in one operation on state of the art Swiss Lathes. AMPG begins with precision ground DFARS compliant material. A finished part is made in one operation without the need for secondary broaching, slotting or thread rolling which can lead to many inconsistencies. AMPG’s process ensures shoulder diameter concentricity and tight tolerances. Each part is then carefully cleaned and packaged.
AMPG manufactures two types of precision shoulder screws, Knurled Head and Smooth Head. Both types have shoulders that are held to a precise diameter. This dimension determines the type of component the shoulder can accommodate.Knurled head shoulder screws are made to ASME shoulder tolerance and have been the industry standard suitable for use in machinery, and other critical mechanical applications. Smooth head, also known as precision-grade shoulder screws, have tighter shoulder tolerances making them ideal for use with ball bearings and other precision components.
Ordering Shoulder Screws
Shoulder screws are specified by shoulder diameter and shoulder length. For instance, a 5/16 x 3/8-inch shoulder screw has a shoulder diameter of 5/16-inch and shoulder length of 3/8 inch. This differs from other screws and bolts, where this size represents the screws thread size and a thread length.
Measuring Shoulder Screws
How It's Used
| Material Type | Specification | Tensile, psi | Yield, psi | Estimated Shear, psi | Elongation | Brinell Hardness | Rockwell Hardness |
|---|---|---|---|---|---|---|---|
| Aluminum 6061-T6 | ASTM B211 | 45,000 | 40,000 | 22,500 | 17% | BHN 95 | B56 |
| Brass 360 | ASTM B16 | 58,000 | 45,000 | 29,000 | 25% | BHN 143 | B78 |
| Nickel Alloy 405 (Monel) | ASTM B164 | 85,000 | 60,000 | 42,500 | 24% | BHN 163 | B85 |
| Stainless Steel 18-8 (303) | ASTM A582 | 90,000 | 35,000 | 45,000 | 50% | BHN 160 | B83 |
| Stainless Steel 316 (316/316L) | ASTM A276 | 75,000 | 30,000 | 37,500 | 45% | BHN 160 | B83 |
| Stainless Steel High Five® (316 H5) | ASTM A276 | 125,000 | 100,000 | 62,500 | 26% | BHN 250 | C25 |
| Stainless Steel 416 | Cond A ASTM A582 Cond T |
75,000 123,000 |
40,000 110,000 |
37,500 61,500 |
30% 11% |
BHN 155 BHN 245 |
B82 C24 |
| Stainless Steel 17-4 PH | Cond A ASTM A564 TYPE 630 |
160,000 | 145,000 | 80,000 | 15% | BHN 332 | C36 |
| Stainless Steel A286 | ASTM A638 GR 660 | 160,000 | 120,000 | 80,000 | 27% | BHN 248 | C24 |
| Steel 12L14 | ASTM A108 | 78,000 | 60,000 | 39,000 | 15% | BHN 160 | B84 |
| Steel Alloy C4140/4140 (Alloy) | ASTM A108 Cold ASTM A108 Thru Hard |
105,000 140,000 |
85,000 n/a |
52,500 70,000 |
15% n/a |
BHN 187 BHN 300 |
B91 C32 |
| Steel Grade 2 | ASTM A307 Equivalent | 60,000 | 36,000 | 30,000 | 18% | BHN 160 | B70 |
| Titanium Grade 2 | ASTM B348 GR 2 | 75,000 | 55,000 | 37,500 | 20% | BHN 163 | B85 |
| Titanium Grade 5 (6AL-4V) | ASTM B348 GR 5 | 140,000 | 125,000 | 70,000 | 18% | BHN 296 | C32 |