Sinker Bar

Sinker Bar (Grade C, K, D, HS)

Description
Sinker bar, a steel rod of a specified length, normally in a larger diameter than sucker rods, is provided in standard sizes with externally threaded ends offered to add weight and stability to the sucker rod string. An oil well uses only one sinker bar, and it is placed at the bottom of the sucker rod string. We offer carbon steel sinker bar, alloy steel sinker bar, etc.

Features
Generally, sinker bar has one elevator neck on one end, and pin threads on each end maybe sucker rod thread or polished rod thread, determined by the sucker rod string.

Advantages
We produce all grades of sinker bars in accordance with API Specification 11B. We use pit furnace to carry out heat treatment for larger diameter sinker bars to guarantee qualified mechanical properties and straightness of API sinker bars.

Parameter

Dimensions and Tolerances of Sinker Bars
Nominal Size		1-1/4 in.		1-3/8 in.			1-1/2 in.		1-5/8 in.		1-3/4 in.
		in.	mm	in.		mm	in.	mm	in	mm	in.	mm
With Sucker Rod Pin Threads
Sinker Bar Diameter	Size	1.250	31.75		1.375	34.93	1.500	38.10	1.625	41.28	1.750	44.45
	Tolerances	+0.000 -0.030	+0.00 -0.76		+0.000 -0.030	+0.00 -0.76	+0.000 -0.030	+0.00 -0.76	+0.000 -0.030	+0.00 -0.76	+0.000 -0.030	+0.00 -0.76
Pin Shoulder to Wrench Flat	Max. Size	0.750	19.05		0.750	19.05	0.750	19.05	0.750	19.05	0.750	19.05
of Wrench Flat (2 flats standard)	Size	1.000	25.40		1.000	25.40	1.3125	33.34	1.3125	33.34	1.500	38.10
	Tolerances	±0.03125	±0.794		±0.03125	±0.794	±0.03125	±0.794	±0.03125	±0.794	±0.03125	±0.794
Elevator Neck Diameter	Size	0.875	22.23		1.000	25.40	1.000	25.40	1.000	25.40	1.000	25.40
	Tolerances	+0.009 -0.018	+0.23 -0.46		+0.009 -0.018	+0.23 -0.46	+0.009 -0.018	+0.23 -0.46	+0.009 -0.018	+0.23 -0.46	+0.009 -0.018	+0.23 -0.46
Length of Sinker Bar	Size	240	6,096		240	6,096	240	6,096	240	6,096	240	6,096
		300	7,620		300	7,620	300	7,620	300	7,620	300	7,620
		360	9,144		360	9,144	360	9,144	360	9,144	360	9,144
	Tolerances	±2.000	±50.80		±2.000	±50.80	±2.000	±50.80	±2.000	±50.80	±2.000	±50.80
Length of Wrench Flat	Min. Length	1.250	31.75		1.250	31.75	1.250	31.75	1.250	31.75	1.250	31.75
Rod Pin Size (Nominal Size)		5/8			5/8		3/4		7/8		7/8
Length of Elevator Neck	Min. Length	4.000	101.60		4.000	101.60	4.000	101.60	4.000	101.60	4.000	101.60
With Polished Rod Pin Threads
Rod Pin Size (Nominal Size)	Size	3/4		3/4			7/8
1. Four wrench flats are available.
2. Customers can choose from elevator neck.
3. Length of sinker bars shall be measured from one outer end of pin to the other outer end of pin. 4. Minimum length excludes fillet.
5. Dimensions of sinker bars with polished rod threads are the same as those of sinker bars with sucker rod threads as shown above.