B18.31.2 Steel Double Ended Bolt Fine Teeth Rough Pole Clamping Studs UNF

Standard B18.31.2 Steel Double Ended Bolt Fine Teeth / UNF Rough Pole Clamping Type Studs

Use of coarse and fine threads:

(1) Fine threads are suitable for anti-vibration and easy to adjust the clearance, but the locking force is worse than coarse threads. It is suitable for applications where the clearance or torque is to be adjusted.

(2) Coarse threads have a poorer self-locking ability than fine threads, but the locking force is greater than fine threads. Generally there is no special requirement to use coarse threads.

 

Data:

Standard	ANSI/ASME, JIS, EN, DIN, BS,GB, SH, HG, IFI, ISO
Size	Standard & non-standard, customized
Material	Carbon steel
Grade	4.8,6.8,8.8,10.9,12.9
Thread	UNC,UNF,BSW
Finish	Black oxide
Packing	cartons on pallet or wooden case
Test Equipments	Desktop direct- reading spectrometer, cutting machine, automatic pre- milling machine, polishing machin,
	hard-testing gauge(Vickers), metallography microscope, electrolytic thickness gauge, tensile testing machine,
	salt spray device, magnetic detection machine(magnetic particle flaw detector), Caliper, Go&No-go gauge and etc.
Supply Ability	About 80 tons per month
MOQ	5pcs
Trade Term	FOB/CIF/CFR/CNF/EXW/DDU
Payment	T/T, L/C ,D/P , Western Union

 

ASME/ANSI B18.31.2-2  Rough pole clamping type studs fine teeth-Table 2

 

d	1/4	5/16	3/8	7/16	1/2	9/16	5/8
p	28	24	24	20	20	18	18
c max	0.071	0.083	0.083	0.1	0.1	0.111	0.111
ds max	0.25	0.3125	0.375	0.4375	0.5	0.5625	0.625
ds min	0.243	0.304	0.367	0.428	0.491	0.552	0.615

d	3/4	7/8	1	1-1/8	1-1/4	1-3/8	1-1/2
p	16	14	12	12	12	12	12
c max	0.125	0.143	0.167	0.167	0.167	0.167	0.167
ds max	0.75	0.875	1	1.125	1.25	1.375	1.5
ds min	0.739	0.863	0.987	1.112	1.237	1.362	1.487

 

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