Stainless Steel Hexagon Socket Head Bolt - Grade 202, 304, 316, A2, A2-70
Hexagon Socket Head Bolts, commonly known as Socket Head Cap Screws or Allen Bolts, are high-strength precision fasteners designed for applications requiring compact installation and high torque transmission. The cylindrical head with an internal hexagonal socket allows tightening using an Allen key, making these fasteners ideal for installations where conventional hex bolts cannot be used. Manufactured according to DIN 912, ISO 4762, and IS 2269 standards, grade 202, 304, 316 , these bolts provide excellent strength, reliability, and dimensional accuracy. They are widely used in machinery, automotive assemblies, industrial equipment, tooling fixtures, and heavy engineering applications.
Technical Specifications
Metric – ISO 4762 / DIN 912 / IS 2269
| Nominal Size | Pitch (P) | Head Ø (Dₖ) | Head Ht (K) | Socket (S) | Spanner Size | F/T Length (mm) |
H/T Length (mm) |
| M4 | 0.7 | 7 mm | 4 mm | 3 mm | 3 mm | 16-40 |
30-40 |
| M5 | 0.8 | 8.5 mm | 5 mm | 4 mm | 4 mm | 16-50 |
30-50 |
| M6 | 1.0 | 10 mm | 6 mm | 5 mm | 5 mm | 20-60 |
35-60 |
| M8 | 1.25 | 13 mm | 8 mm | 6 mm | 6 mm | 25-70 |
40-70 |
| M10 | 1.5 | 16 mm | 10 mm | 8 mm | 8 mm | 25-100 |
45-100 |
| M12 | 1.75 | 18 mm | 12 mm | 10 mm | 10 mm | 30-100 |
55-100 |
| M16 | 2.0 | 24 mm | 16 mm | 14 mm | 14 mm | 30-150 |
70-150 |
ASME B18.3/ASTM A574
| Nominal Size | TPI | Head Ø (A) | Head Ht (H) | Socket (J) |
| 1/4″ | 20 | 0.375 ″ | ~0.250″ | 3/16 ″ |
| 5/16″ | 18 | 0.437 ″ | ~0.313 ″ | 1/4″ |
| 3/8″ | 16 | 0.562 ″ | ~0.375 ″ | 5/16 ″ |
| 1/2″ | 13 | 0.750 ″ | ~0.500 ″ | 3/8 ″ |
- Typical for property class 8.8 (800 MPa), 10.9 (940 MPa), and 12.9 (1220 MPa) according to ISO 898‑1 / ISO 3506‑1
- Head & socket sizes per ISO 4762 & ISO metric thread standards
Imperial – ASME B18.3 (Coarse Thread, Alloy Steel, 120ksi+ Grade)
- Based on tensile strengths for alloy-steel socket cap screws per ASME B18.3 / ASTM A574 (~140 ksi = 965 MPa)
- Metric values follow ISO 4762 and ISO 898‑1 tensile classification for property classes 8.8, 10.9, and 12.9
- Imperial data is from ASME B18.3 alloy-steel socket cap screws with tensile ~140 ksi (~965 MPa)
- Spanner (wrench) and socket sizes are standardized by ISO and ASME.
Here’s a clear, line-art style diagram of a hexagon socket-head bolt that highlights the key dimensions and parts (head diameter D, head height K, shank, overall length L, threaded length L1, and thread major diameter d). Let me know if you’d like any additional details—such as metric/imperial tables or a version with specific standard call-outs (ISO 4762, ASTM F879, etc.)!
The Hexagon Socket Head Bolt is engineered for precision and reliability, featuring a robust design that ensures optimal performance in high-stress applications. With its hexagonal socket drive, this bolt allows for enhanced torque control, making installation and removal effortless. Crafted from high-grade materials to resist corrosion and wear, it stands as the go-to choice for engineers seeking durable fastening solutions. Elevate your assembly with the unmatched strength and versatility of our Hexagon Socket Head Bolt—where technical excellence meets everyday utility!
Tensile Strength
≥1220 MPa
Yield Strength
≥1100 MPa
Elongation
≥12%
Hardness Max
30–44 HRC
Materials
- Stainless Steel
- AISI 202
- AISI 304
- AISI 316
Steel Grade
- 8.8
- 10.9
- 12.9
Finishing
- Polished
- Geomet
- Dacromet
- Teflon
- Hot-Dip Galvanzing
- Zinc (Yellow, White, Blue)
- Black Qxide
Thread
- Metric
- BSW
- UNC
- UNF
Standards
- Din 912
- ISO 4762
- IS 2269
- BS 2470 - 1973
- ASTM F835
- ASTM A574
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