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Technical Specifications
Comprehensive technical data for our industrial fasteners including strength classifications, torque specifications, and general product information.
Strength Classification
Imperial System
| Strength Classification | Head Marking | Diameter Range | Minimum Tensile Stress | Minimum Yield Stress | Proof Stress | Hardness Rockwell - HRC |
|---|---|---|---|---|---|---|
| SAE Grade 9 | 9 | 1/4 to 1.1/8" | 170,000 PSI 1172 MPa | 150,000 PSI 1034 MPa | 136,000 PSI 938 MPa | 36 - 42 HRC |
| Grade A9 | A9 | 1/4 to 1.1/2" | 180,000 PSI 1241 MPa | 160,000 PSI 1103 MPa | 144,000 PSI 993 MPa | 39 - 43 HRC |
Metric System
| Strength Classification | Head Marking | Diameter Range | Minimum Tensile Stress | Minimum Yield Stress | Proof Stress | Hardness Rockwell - HRC |
|---|---|---|---|---|---|---|
| Class 10.9 | 10.9 | M10 to M33 | 1040 MPa (150,840 PSI) | 940 MPa (136,335 PSI) | 830 MPa (120,380 PSI) | 32 - 39 HRC |
| Class 12.9 | 12.9 | M10 to M33 | 1220 MPa (176,946 PSI) | 1100 MPa (159,542 PSI) | 970 MPa (140,687 PSI) | 39 - 44 HRC |
Suggested Tightening Torque Values
- • Torques given in the following table are indicative only.
- • Torque has an approximately up to ±35% error on desired tension depending on many joint related parameters.
- • Torque has been estimated using a nut factor of 0.19 which generally represents blackened surface with light oil (mostly as supplied condition).
- • Torque has been estimated to achieve 65% of the proof load.
Imperial System - Grade A9 Bolts
| Thread Diameter (in) | 7/16" | 1/2" | 9/16" | 5/8" | 3/4" | 7/8" | 1" | 1.1/8" | 1.1/4" |
|---|---|---|---|---|---|---|---|---|---|
| UNC Torque (lb.ft) | 70 | 107 | 154 | 212 | 376 | 605 | 907 | 1286 | 1812 |
| UNC Torque (Nm) | 95 | 145 | 209 | 287 | 510 | 820 | 1230 | 1743 | 2457 |
| UNF Torque (lb.ft) | 78 | 119 | 171 | 239 | 417 | 665 | 989 | 1435 | 1998 |
| UNF Torque (Nm) | 105 | 162 | 231 | 324 | 566 | 901 | 1341 | 1945 | 2709 |
Metric Fine Thread Series - Class 10.9 Bolts
| Thread Size | M12 | M14 | M16 | M18 | M20 | M22 | M24 | M27 | M30 | M33 |
|---|---|---|---|---|---|---|---|---|---|---|
| Torque (Nm) | 113 | 178 | 275 | 388 | 556 | 750 | 946 | 1370 | 1912 | 2572 |
| Torque (lb.ft) | 83 | 131 | 203 | 293 | 410 | 553 | 697 | 1011 | 1410 | 1897 |
Metric Fine Thread Series - Class 12.9 Bolts
| Thread Size | M12 | M14 | M16 | M18 | M20 | M22 | M24 | M27 | M30 | M33 |
|---|---|---|---|---|---|---|---|---|---|---|
| Torque (Nm) | 132 | 208 | 321 | 465 | 649 | 876 | 1105 | 1602 | 2234 | 3005 |
| Torque (lb.ft) | 97 | 154 | 237 | 343 | 479 | 646 | 815 | 1181 | 1648 | 2217 |
Tensile Strength Comparison
180,000160,000140,000120,000100,00080,00060,000
A9
1/4"-1.1/2"
180,000 PSI
12.9
M10-M33
176,946 PSI
Gr8/10.9
1/4"-1.1/2"
150,000 PSI
Gr5
1"-1.1/2"
120,000 PSI
Gr5
1/4"-1"
105,000 PSI
Gr2
1/4"-3/4"
74,000
Minimum Tensile Strength (PSI)
Grade A9 (Highest)
Class 12.9
Grade 8 / Class 10.9
Grade 5
Grade 2
Product Information
TRACK & SEGMENT FASTENERS
- ■Manufactured from premium alloy steel (40Cr, 42CrMo) ensuring exceptional durability in demanding applications.
- ■Precision cold heading process creates optimal grain flow structure for enhanced head strength.
- ■Generous fillet radius beneath the head minimizes stress concentration points.
- ■Thread rolling produces continuous grain flow with smooth root radius, improving fatigue life.
- ■Washer-faced hex heads ensure:
- - Secure tool engagement
- - Even load distribution
- - Reliable torque application
- ■Controlled heat treatment achieves:
- GRADE 8.8 / 10.9
- - Tensile strength: 830-1040 MPa
- - Surface hardness: HRC 32-39
- GRADE 12.9 / A9
- - Tensile strength: 1220-1241 MPa
- - Surface hardness: HRC 39-44
- ■Optional induction hardening available for head wear resistance (HRC 58-62).
PLOW BOLTS & CUTTING EDGE HARDWARE
- ■Engineered for ground engaging equipment (GEE) applications including graders, dozers, and scrapers.
- ■Countersunk head design provides flush mounting, protecting hardware from abrasion.
- ■Square neck prevents rotation during installation and tightening.
- ■Available in multiple head styles: No.3, No.5, No.7 configurations to match OEM specifications.
- ■Compatible with CAT, Komatsu, John Deere, and other major equipment manufacturers.
MATCHING NUTS
- ■Heat treated to complement bolt strength grades, ensuring balanced joint performance.
- ■Available in hex, flanged hex, and heavy hex configurations.
ORDERING INFORMATION
- ■Products manufactured to ISO, DIN, and ASTM standards with full material traceability.
- ■Part numbers reference OEM equivalents for identification purposes only; all products are AzuLong manufactured.
- ■Bolts and nuts available separately or as matched sets. Custom packaging available upon request.
- ■Minimum order quantities apply for certain specifications. Contact us for pricing on custom requirements.
PACKAGING & SHIPPING
- ■Export-quality wooden pallets with ISPM-15 fumigation certification for international shipping.
- ■Shrink-wrapped protection with desiccants for moisture control during ocean transit.
- ■Direct shipping from Ningbo Port with competitive freight rates worldwide.
QUALITY COMMITMENT
- ■ISO 9001:2015 certified manufacturing facility with in-house metallurgical laboratory.
- ■100% inspection on critical dimensions with documented quality records.
- ■Each production batch carries a unique lot number for complete traceability from raw material to finished product.
DOCUMENTATION
- ■Material Test Reports (MTR) / Mill Certificates provided with each shipment upon request.
- ■Certificate of Conformance (CoC) available documenting compliance with specified standards.
- ■Hardness test reports and dimensional inspection records maintained for quality assurance.