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- Crosby "M279" & "S279" Machinery Shoulder Eye Bolts
M279 & S279 Features
- Forged Steel - Quenched & Tempered.
- Working Load Limits shown are for in-line pull.
- Fatigue rated at 1-1/2 times the Working Load Limit at 20,000 cycles.
- Recommended for in-line pull.
- S-279 threaded UNC.
- M-279 metric threaded.
- Meets or exceeds all requirements of ASME B30.26 including identification, ductility, design factor, proof load and temperature requirements. Importantly, these bolts meet other critical performance requirements including fatigue life, impact properties and material traceability not addressed by ASME B30.26.
M-279 Metric Dimensions & Specifications
Size | M-279 Stock No. | Working Load Limit (kg) | Weight Each (kg) | Dimensions (mm) | |||||||
A** Thread | B | C | D | E | F | G | H | ||||
M6 x 13 | 1045753 | 200 | .03 | M6 x 1.0 | 13.0 | 28.7 | 19.1 | 47.0 | 4.9 | 13.5 | 19.6 |
M8 x 13 | 1045789 | 400 | .05 | M8 x 1.25 | 13.0 | 35.1 | 22.4 | 54.6 | 6.4 | 15.0 | 24.1 |
M10 x 17 | 1045833 | 640 | .07 | M10 x 1.5 | 17.0 | 41.1 | 25.4 | 64.3 | 7.9 | 17.5 | 26.5 |
M12 x 20.5 | 1045869 | 1000 | .11 | M12 x 1.75 | 20.5 | 49.5 | 30.2 | 77.7 | 9.7 | 23.1 | 32.8 |
M16 x 27 | 1045913 | 1800 | .25 | M16 x 2.0 | 27.0 | 60.5 | 35.1 | 96.0 | 12.7 | 28.7 | 38.9 |
M20 x 30 | 1045995 | 2500 | .42 | M20 x 2.5 | 30.0 | 70.0 | 38.1 | 108 | 16.0 | 35.1 | 43.4 |
M24 x 36 | 1046029 | 4000 | 1.05 | M24 x 3.0 | 36.0 | 95.5 | 51.0 | 142 | 22.4 | 46.0 | 58.4 |
M27 x 69.8 | 1046038 | 5000 | 1.42 | M27 x 3.0 | 69.8 | 107 | 57.1 | 183 | 24.6 | 52.3 | 59.7 |
M30 x 45 | 1046075 | 6000 | 1.77 | M30 x 3.5 | 45.0 | 114 | 63.5 | 171 | 25.4 | 58.0 | 69.3 |
M36 x 54 | 1046109 | 8500 | 3.12 | M36 x 4.0 | 54.0 | 140 | 76.0 | 207 | 31.8 | 70.0 | 83.3 |
M42 x 95.2 | 1046118 | 14000 | 4.58 | M42 x 4.5 | 95.2 | 159 | 88.9 | 266 | 35.0 | 76.2 | 91.4 |
M48 x 102 | 1046127 | 17300 | 8.71 | M48 x 5.0 | 102 | 194 | 101 | 313 | 46.0 | 85.9 | 114 |
M64 x 127 | 1046136 | 29500 | 14.74 | M64 x 6.0 | 127 | 223 | 114 | 378 | 53.8 | 108 | 140 |
** On Request: Special threading, as forged bolts for customer conversion.

S-279 UNC Imperial Dimensions & Specifications
Size (in.) | S-279 Stock No. | Working Load Limit (lbs) | Weight per 100 (lbs) | Dimensions (in) | |||||||
A** Thread | B | C | D | E | F | G | H | ||||
1/4 x 1 | 9900182 | 650 | 5.00 | 1/4 - 20 | 1.02 | 1.13 | .75 | 2.29 | .19 | .53 | .77 |
5/16 x 1-1/8 | 9900191 | 1200 | 9.00 | 5/16 - 18 | 1.15 | 1.38 | .88 | 2.74 | .25 | .59 | .95 |
3/8 x 1-1/4 | 9900208 | 1550 | 15.00 | 3/8 - 16 | 1.27 | 1.62 | 1.00 | 3.07 | .31 | .69 | 1.05 |
1/2 x 1-1/2 | 9900217 | 2600 | 28.00 | 1/2 - 13 | 1.53 | 1.95 | 1.19 | 3.70 | .38 | .91 | 1.27 |
5/8 x 1-3/4 | 9900226 | 5200 | 55.00 | 5/8 - 11 | 1.79 | 2.38 | 1.38 | 4.45 | .50 | 1.13 | 1.53 |
3/4 x 2 | 9900235 | 7200 | 96.00 | 3/4 - 10 | 2.05 | 2.76 | 1.50 | 5.07 | .63 | 1.38 | 1.71 |
7/8 x 2-1/4 | 9900244 | 10600 | 154.00 | 7/8 - 9 | 2.31 | 3.25 | 1.75 | 5.87 | .75 | 1.56 | 2.00 |
1 x 2-1/2 | 9900253 | 13300 | 238.00 | 1 - 8 | 2.57 | 3.76 | 2.00 | 6.66 | .88 | 1.81 | 2.30 |
1-1/8 x 2-3/4 | 9900257 | 15000 | 320.00 | 1-1/8 - 7 | 2.75 | 4.19 | 2.25 | 7.20 | .97 | 2.06 | 2.35 |
1-1/4 x 3 | 9900262 | 21000 | 399.00 | 1-1/4 - 7 | 3.09 | 4.50 | 2.50 | 7.95 | 1.00 | 2.28 | 2.73 |
1-1/2 x 3-1/2 | 9900271 | 24000 | 720.00 | 1-1/2 - 6 | 3.60 | 5.50 | 3.00 | 9.49 | 1.25 | 2.75 | 3.28 |
1-3/4 x 3-3/4 | 9900280 | 34000 | 1040.00 | 1-3/4 - 5 | 3.75 | 6.26 | 3.50 | 10.48 | 1.38 | 3.00 | 3.60 |
2 x 4 | 9900289 | 42000 | 1880.0 | 2 - 4-1/2 | 4.00 | 7.62 | 4.00 | 12.31 | 1.81 | 3.38 | 4.50 |
2-1/2 x 5 | 9900298 | 65000 | 3250.00 | 2-1/2 - 4 | 5.00 | 8.76 | 4.50 | 14.88 | 2.12 | 4.25 | 5.50 |
* Ultimate Load is 5 times the Working Load Limit. Maximum Proof Load is 2 times the Working Load Limit
** All Bolts Threaded UNC
M279 & S279 Features
- Forged Steel - Quenched & Tempered.
- Working Load Limits shown are for in-line pull.
- Fatigue rated at 1-1/2 times the Working Load Limit at 20,000 cycles.
- Recommended for in-line pull.
- S-279 threaded UNC.
- M-279 metric threaded.
- Meets or exceeds all requirements of ASME B30.26 including identification, ductility, design factor, proof load and temperature requirements. Importantly, these bolts meet other critical performance requirements including fatigue life, impact properties and material traceability not addressed by ASME B30.26.
M-279 Metric Dimensions & Specifications
Size | M-279 Stock No. | Working Load Limit (kg) | Weight Each (kg) | Dimensions (mm) | |||||||
A** Thread | B | C | D | E | F | G | H | ||||
M6 x 13 | 1045753 | 200 | .03 | M6 x 1.0 | 13.0 | 28.7 | 19.1 | 47.0 | 4.9 | 13.5 | 19.6 |
M8 x 13 | 1045789 | 400 | .05 | M8 x 1.25 | 13.0 | 35.1 | 22.4 | 54.6 | 6.4 | 15.0 | 24.1 |
M10 x 17 | 1045833 | 640 | .07 | M10 x 1.5 | 17.0 | 41.1 | 25.4 | 64.3 | 7.9 | 17.5 | 26.5 |
M12 x 20.5 | 1045869 | 1000 | .11 | M12 x 1.75 | 20.5 | 49.5 | 30.2 | 77.7 | 9.7 | 23.1 | 32.8 |
M16 x 27 | 1045913 | 1800 | .25 | M16 x 2.0 | 27.0 | 60.5 | 35.1 | 96.0 | 12.7 | 28.7 | 38.9 |
M20 x 30 | 1045995 | 2500 | .42 | M20 x 2.5 | 30.0 | 70.0 | 38.1 | 108 | 16.0 | 35.1 | 43.4 |
M24 x 36 | 1046029 | 4000 | 1.05 | M24 x 3.0 | 36.0 | 95.5 | 51.0 | 142 | 22.4 | 46.0 | 58.4 |
M27 x 69.8 | 1046038 | 5000 | 1.42 | M27 x 3.0 | 69.8 | 107 | 57.1 | 183 | 24.6 | 52.3 | 59.7 |
M30 x 45 | 1046075 | 6000 | 1.77 | M30 x 3.5 | 45.0 | 114 | 63.5 | 171 | 25.4 | 58.0 | 69.3 |
M36 x 54 | 1046109 | 8500 | 3.12 | M36 x 4.0 | 54.0 | 140 | 76.0 | 207 | 31.8 | 70.0 | 83.3 |
M42 x 95.2 | 1046118 | 14000 | 4.58 | M42 x 4.5 | 95.2 | 159 | 88.9 | 266 | 35.0 | 76.2 | 91.4 |
M48 x 102 | 1046127 | 17300 | 8.71 | M48 x 5.0 | 102 | 194 | 101 | 313 | 46.0 | 85.9 | 114 |
M64 x 127 | 1046136 | 29500 | 14.74 | M64 x 6.0 | 127 | 223 | 114 | 378 | 53.8 | 108 | 140 |
** On Request: Special threading, as forged bolts for customer conversion.

S-279 UNC Imperial Dimensions & Specifications
Size (in.) | S-279 Stock No. | Working Load Limit (lbs) | Weight per 100 (lbs) | Dimensions (in) | |||||||
A** Thread | B | C | D | E | F | G | H | ||||
1/4 x 1 | 9900182 | 650 | 5.00 | 1/4 - 20 | 1.02 | 1.13 | .75 | 2.29 | .19 | .53 | .77 |
5/16 x 1-1/8 | 9900191 | 1200 | 9.00 | 5/16 - 18 | 1.15 | 1.38 | .88 | 2.74 | .25 | .59 | .95 |
3/8 x 1-1/4 | 9900208 | 1550 | 15.00 | 3/8 - 16 | 1.27 | 1.62 | 1.00 | 3.07 | .31 | .69 | 1.05 |
1/2 x 1-1/2 | 9900217 | 2600 | 28.00 | 1/2 - 13 | 1.53 | 1.95 | 1.19 | 3.70 | .38 | .91 | 1.27 |
5/8 x 1-3/4 | 9900226 | 5200 | 55.00 | 5/8 - 11 | 1.79 | 2.38 | 1.38 | 4.45 | .50 | 1.13 | 1.53 |
3/4 x 2 | 9900235 | 7200 | 96.00 | 3/4 - 10 | 2.05 | 2.76 | 1.50 | 5.07 | .63 | 1.38 | 1.71 |
7/8 x 2-1/4 | 9900244 | 10600 | 154.00 | 7/8 - 9 | 2.31 | 3.25 | 1.75 | 5.87 | .75 | 1.56 | 2.00 |
1 x 2-1/2 | 9900253 | 13300 | 238.00 | 1 - 8 | 2.57 | 3.76 | 2.00 | 6.66 | .88 | 1.81 | 2.30 |
1-1/8 x 2-3/4 | 9900257 | 15000 | 320.00 | 1-1/8 - 7 | 2.75 | 4.19 | 2.25 | 7.20 | .97 | 2.06 | 2.35 |
1-1/4 x 3 | 9900262 | 21000 | 399.00 | 1-1/4 - 7 | 3.09 | 4.50 | 2.50 | 7.95 | 1.00 | 2.28 | 2.73 |
1-1/2 x 3-1/2 | 9900271 | 24000 | 720.00 | 1-1/2 - 6 | 3.60 | 5.50 | 3.00 | 9.49 | 1.25 | 2.75 | 3.28 |
1-3/4 x 3-3/4 | 9900280 | 34000 | 1040.00 | 1-3/4 - 5 | 3.75 | 6.26 | 3.50 | 10.48 | 1.38 | 3.00 | 3.60 |
2 x 4 | 9900289 | 42000 | 1880.0 | 2 - 4-1/2 | 4.00 | 7.62 | 4.00 | 12.31 | 1.81 | 3.38 | 4.50 |
2-1/2 x 5 | 9900298 | 65000 | 3250.00 | 2-1/2 - 4 | 5.00 | 8.76 | 4.50 | 14.88 | 2.12 | 4.25 | 5.50 |
* Ultimate Load is 5 times the Working Load Limit. Maximum Proof Load is 2 times the Working Load Limit
** All Bolts Threaded UNC
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