RIBBED NECK CARRIAGE BOLTS, GRADE 5, ZINC PLATED
Earnest Machine Products line of Ribbed Neck Carriage Bolts are through hardened to a Rockwell Hardness of Rc 25/34. The threads are cold rolled and the Ribs (serrations on neck) are full formed. The high hardness provides greater wear resistance to the head and better toughness as compared to standard(or "slick head") carriage bolts. The high strength (120,000 psi min Tensile Strength) resists bending that causes slick head carriage bolts to be difficult to remove without torch cutting them out.
Earnest's Carriage Bolts are plated with Zinc and a Clear Chromate topcoat to provide resistance to corrosion.
Ribbed Neck Carriage Bolts are designed to be used in applications that are assembling wood, plastic, soft metals or composite materials together or to a steel frame. The added design features of a low profile head and a fastener that can be installed from the nut side of the assembly make this style fastener useful in many applications. The low profile head ensures that there is no interference with material or objects as they slide over the head of the product.
Popular uses included installing floor boards to the bed of trucks, installation of grain elevator buckets,wear resistant sheeting to conveyers or chutes and many more applications that require a low profile, high wear resistant fastener with excellent toughness.
Easy installation is achieved by initially tapping the head of the bolt into the material to be clamped. The nut can then be installed onto the protruding threads of the bolt. Tighten the nut to draw the carriage bolt into the material. The ribs will prevent the carriage bolt from turning during assembly.
Recommended Holes sizes for Ribbed Neck Carriage Bolts
| Bolt Size |
Hole Size |
| |
Decimal |
Drill Size |
| 1/4-20 |
.250 to .260 |
1/4 to G |
| 5/16 |
.312 to .323 |
5/16 to P |
| 3/8-16 |
.375 to .386 |
3/8 to W |
Carriage Bolts
| Part Number |
Size |
Length
L |
Head Diameter
A |
Head Thickness
H |
Rib Length
P |
Rib Diameter O |
Grip Length Lg |
Thread Length
Lt |
| |
|
Nom |
Tol |
Max |
Min |
Max |
Min |
Max |
Min |
Min |
Max |
Min |
| 218874 |
1/4-20 |
3/4 |
+.02/-.03 |
.594 |
.563 |
.145 |
.125 |
.219 |
.281 |
.274 |
.468 |
.282 |
| 218884 |
1/4-20 |
1 |
+.02/-.03 |
.594 |
.563 |
.145 |
.125 |
.376 |
.438 |
.274 |
.688 |
.312 |
| 218894 |
1/4-20 |
1 1/4 |
+.02/-.04 |
.594 |
.563 |
.145 |
.125 |
.563 |
.625 |
.274 |
.844 |
.406 |
| 218904 |
1/4-20 |
1 1/2 |
+.02/-.04 |
.594 |
.563 |
.145 |
.125 |
.563 |
.625 |
.274 |
.844 |
.656 |
| 218984 |
1/4-20 |
2 |
+.02/-.04 |
.594 |
.563 |
.145 |
.125 |
.563 |
.625 |
.274 |
1.250 |
.750 |
| 219034 |
5/16-18 |
1 |
+.02/-.03 |
.719 |
.688 |
.176 |
.156 |
.376 |
.438 |
.340 |
.671 |
.329 |
| 219044 |
5/16-18 |
1 1/4 |
+.02/-.04 |
.719 |
.688 |
.176 |
.156 |
.563 |
.625 |
.340 |
.858 |
.392 |
| 219054 |
5/16-18 |
1 1/2 |
+.02/-.04 |
.719 |
.688 |
.176 |
.156 |
.563 |
.625 |
.340 |
.858 |
.642 |
| 219084 |
5/16-18 |
1 3/4 |
+.02/-.04 |
.719 |
.688 |
.176 |
.156 |
.563 |
.625 |
.340 |
.875 |
.875 |
| 219104 |
5/16-18 |
2 |
+.02/-.04 |
.719 |
.688 |
.176 |
.156 |
.563 |
.625 |
.340 |
1.125 |
.875 |
| 219114 |
5/16-18 |
2 1/2 |
+.02/-.04 |
.719 |
.688 |
.176 |
.156 |
.563 |
.625 |
.340 |
1.625 |
.875 |
| 219204 |
3/8-16 |
1 |
+.02/-.04 |
.844 |
.782 |
.208 |
.188 |
.376 |
.438 |
.405 |
.688 |
.312 |
| 219214 |
3/8-16 |
1 1/4 |
+.02/-.04 |
.844 |
.782 |
.208 |
.188 |
.563 |
.625 |
.405 |
.875 |
.375 |
| 219344 |
3/8-16 |
1 1/2 |
+.02/-.04 |
.844 |
.782 |
.208 |
.188 |
.563 |
.625 |
.405 |
.875 |
.625 |
| 219374 |
3/8-16 |
1 3/4 |
+.02/-.04 |
.844 |
.782 |
.208 |
.188 |
.563 |
.625 |
.405 |
.875 |
.875 |
| 219384 |
3/8-16 |
2 |
+.02/-.04 |
.844 |
.782 |
.208 |
.188 |
.563 |
.625 |
.405 |
1.000 |
1.000 |
| 219444 |
3/8-16 |
2 1/2 |
+.02/-.04 |
.844 |
.782 |
.208 |
.188 |
.563 |
.625 |
.405 |
1.500 |
1.000 |