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ANSI B18.5.2.3M Round Bolt
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Product Description
Leader-Fastener® ANSI B18.5.2.3M Round Bolt is a standard developed through the procedures of The American Society of Mechanical Engineers. B18.5 is under the jurisdiction of ASME Standards Committee B18 and is the directresponsibility of its Subcommittee 2.
This standard covers the complete general and dimensional data for the various typeof inch series bolts generally classified as roundhead bolts and recognized as American National Standard. Also included is an appendix covering gages and gaging for checking bolt straightness.
The inclusion of dimensional data in thisstandard is not intended to imply that all of the products described are stock production sizes. Consumers should consult with manufacturersconcerning availability of products.
Round Head Bolt (Formerly Designated Button Head Bolt). The round head boltshall have a circular head with a low roundedtop surface and a flat bearing surface.
Round Head Square Neck Bolt (Formerly Designated Round Head Carriage Bolt). The round head square neck bolt shall have a circular head with a low rounded top surface and flat bearing surface, and an integrally formed square neck under the head.
Round Head Short Square Neck Bolt.The round head short square neck bolt shall havea circular head witha low rounded top surface and flat bearing an integrally formedshort length square neck under the head.
Round Head Ribbed Neck Bolt (Formerly Designated Ribbed Neck CarriageBolt). The round head ribbed neck bolt shall have a circular head with a low rounded top surface and flat bearing surface, and a ribbed or splined neck formed on the shank below the head.
Round Head Fin Neck Bolt (Formerly Designated Fin Neck Carriage Bolt). The round head fin neck bolt shall have a circularhead with a low rounded top surface and flatbearing surface,and two diametrically oppositeintegrally formed fins at the junction of head withshank.
Step Bolt. The step bolt shall have alarge circular head with a low rounded top surface and flat bearing surface, and an integrallyformed square neck under the head.
Countersunk Bolt.The countersunk bolt shall have a circular head with a flat top surface and a conical bearing surface having a headangle of approximately 80 deg. Countersunkbolts are available with and without a slot in the head, as specified by the purchaser.
Deg Countersunk Square NeckBolt (Formerly Designated Countersunk Carriage Bolt). The 114 deg countersunk squareneck bolt shall have a circular head with a flattop surface and a conical bearing surface having a head angle of approximately 114 deg, andan integrally formed square neck under the head.
Flat Countersunk Head Elevator Bolt.The flat countersunk head elevator bolt shallhave a large circular head with a flat top surfaceand a shallow conical bearing surface, and anintegrally formed square neck under the head.
T-Head Bolt.The T-head bolt shall havea rectangular head with a rounded top surfaceand a flat bearing surface.
Leader-Fastener® ANSI/ASME B 18.5.2.3M - 1998 Metric round head square neck bolts with large head
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Screw Thread d |
M5 | M6 | M8 | M10 | M12 | M16 | M20 | |
| P | Pitch | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2.5 |
| b | L≤125 | 16 | 18 | 22 | 26 | 30 | 38 | 46 |
| 125＜L≤200 | 22 | 24 | 28 | 32 | 36 | 44 | 52 | |
| 200＜L | 35 | 37 | 41 | 45 | 49 | 57 | 65 | |
| dk | max | 13 | 16 | 20 | 24 | 30 | 38 | 46 |
| min | 11.9 | 14.9 | 18.7 | 22.7 | 28.7 | 36.4 | 44.4 | |
| k1 | max | 4.1 | 4.6 | 5.6 | 6.6 | 8.8 | 12.9 | 15.9 |
| min | 2.9 | 3.4 | 4.4 | 5.4 | 7.2 | 11.1 | 14.1 | |
| k | max | 3.1 | 3.6 | 4.8 | 5.8 | 6.8 | 8.9 | 10.9 |
| min | 2.5 | 3 | 4 | 5 | 6 | 8 | 10 | |
| s | max | 5.48 | 6.48 | 8.58 | 10.58 | 12.7 | 16.7 | 20.84 |
| min | 4.52 | 5.52 | 7.42 | 9.42 | 11.3 | 15.3 | 19.16 | |
| ds | max | 5.48 | 6.48 | 8.58 | 10.58 | 12.7 | 16.7 | 20.84 |
| min | 4.36 | 5.21 | 7.04 | 8.86 | 10.68 | 14.5 | 18.16 | |
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