Oval Neck Track Bolt Manufacturer
An oval neck track bolt joins two rail ends through the joint bar, or fish plate, at a rail joint. Its button head has an oval neck forged directly beneath it. The neck sits in the oval hole of the joint bar, so the bolt cannot turn while the nut is tightened, and one spanner does the job.
The same bolt goes by different names in different markets. In the USA and Canada it is a track bolt or BHON bolt (button head oval neck). In India and the UK it is a fish bolt, fishplate bolt or fishbolt, and many buyers call it a mushroom head oval neck bolt. It is also used to splice crane rails.
S.R. Forgings forges oval neck track bolts and fish bolts in alloy steel at Focal Point, Ludhiana, in inch sizes with UNC or BSW threads, supplied with heavy square nuts.
Oval Neck Track Bolts
Size: 3/4" to 1-1/8" diameter
Thread: UNC or BSW
Length: As ordered
Nut: Heavy square nut
Material: Alloy steel
Finish: Plain, black or hot-dip galvanised
Minimum order: Depends on size; 1" from 1,500 pcs
Drawing and Dimensions
Our drawing shows the head, oval neck, thread length and nut, with the size range in UNC and BSW. Head, neck and thread dimensions are made to your drawing or to the railway standard you specify.
Send EnquiryTrack Bolt Size Chart
| Nominal diameter | UNC thread (tpi) | BSW thread (tpi) | Length | Nut |
|---|---|---|---|---|
| 3/4" (19.05 mm) | 3/4"-10 UNC | 3/4"-10 BSW | As ordered | Heavy square |
| 7/8" (22.23 mm) | 7/8"-9 UNC | 7/8"-9 BSW | As ordered | Heavy square |
| 1" (25.40 mm) | 1"-8 UNC | 1"-8 BSW | As ordered | Heavy square |
| 1-1/8" (28.58 mm) | 1-1/8"-7 UNC | 1-1/8"-7 BSW | As ordered | Heavy square |
Head diameter, head height, neck length and width, and thread length are made to customer drawing or the applicable railway standard. Other diameters and special neck forms are made to drawing.
Fish Bolt Manufacturer in India
We manufacture fish bolts and nuts for rail joints: the fish bolt passes through the two fish plates and the web of both rails, and the oval neck locks into the plate so the nut can be pulled up from one side. The head and oval neck are forged in one piece.
Fish bolts are made in alloy steel only, in 3/4" to 1-1/8" diameter, with BSW threads for Indian and British rail practice or UNC for North American track. Each bolt is supplied with its heavy square nut, plain, black or hot-dip galvanised. The minimum order depends on size: in 1" diameter we can take orders from 1,500 pieces.
Questions Buyers Ask
Is a fish bolt the same as a track bolt?
Yes. Both join rail ends through the plates at a rail joint. "Fish bolt" is the Indian and British name, taken from the fish plate. "Track bolt" is the North American name, where the plate is called a joint bar or splice bar. The button head and oval neck are the same idea.
Why an oval neck and not a square neck?
The oval neck stops the bolt turning, exactly like the square neck of a carriage bolt, but the matching hole in the plate is oval rather than square. An oval hole is easier to punch or machine and has no sharp corners where cracks can start.
Do you make inch sizes?
Yes. Rail practice in India came from the British system, so fish bolts here are made in inch sizes with BSW threads. We also make them with UNC threads for North American buyers. Tell us which thread form you need, because a UNC nut will not run on a BSW bolt of the same diameter.
Do you make stainless steel fish bolts?
No. We make oval neck track bolts and fish bolts in alloy steel only. If your specification calls for stainless steel, we are not the right supplier for that item.
What is the minimum order for fish bolts?
It depends on the size. In 1" diameter we can make as few as 1,500 pieces. For other sizes, send the diameter and quantity and we will confirm.
What should I send for a quotation?
Diameter, length under head, thread form (UNC or BSW), grade, finish and quantity, or simply your drawing. Related products: heavy nuts and washers.
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