ASTM A320 Grade L7 Countersunk Screws
Boltport offers ASTM A320 Grade L7 Countersunk Screws in metric and inch sizes, manufactured to DIN 7991, ISO 10642, UNI 5933, ASME B18.3 & B18.3.1M standards with coarse, UNC, UN, fine UNF, extra fine UNEF, ISO, BSW & BSF threads. Countersunk screws are available in full thread, part threads pattern. A320 Grade L7 countersunk screws are produced from SAE / AISI 4140 alloy steel and heat-treated to induce properties suitable for low temperature service.
Countersunk Screw Sizes & Thread Specifications
| Metric Sizes |
M1.6 – M20 |
| Inch Sizes |
#0 to 1-1/2" |
| Metric Threads |
ISO, ASME |
| Imperial Threads |
ASME, BSW, BSF |
| Thread Standards |
ISO 68-1, ISO 268, ISO 724, ASME B1.1, ASME B1.13M, BS 84, BS 3643 |
Countersunk Screw Standards
