SS Serrated Flange Locking Nut

18-8 stainless steel serrated flange lock nuts eliminate the need for a lock washer or washer, as the flange serves to distribute the bearing load over a greater area. The bearing surface has circular serrations that fan out so that once the serrated flange makes contact with the mating surface, the serrations cut into and displace the mating material upon tightening. All metal lock nuts are resistant to high temperatures and high chemical exposures, as they are made from one material. Dimensional specifications are governed by ASME B18.6.4.

Technical Data

Governing Standards18-8 Stainless Steel

ASME B18.16.4	Covers the general, dimensional, and mechanical performance requirements for low strength carbon steel, case hardened, regular and large serrated flange locknuts (inch series), recognized as American National Standard.
ASME B1.1 UNC & UNF Class 2B	Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.

Dimensional SpecificationsCase Hardened

Per ASME B18.16.4-2008
Nominal Diameter		UNC	UNF	F		G		B		H		J	K
				Width Across Flats		Width Across Corners		Flange Diameter		Nut Thickness		Hex Height	Flange Thickness
				Max	Min	Max	Min	Max	Min	Max	Min	Hex Height	Flange Thickness
#6	0.1380	32	40	0.3120	0.3020	0.3610	0.3420	0.4220	0.4060	0.1710	0.1560	0.1000	0.0200
#8	0.1640	32	36	0.3440	0.3340	0.3970	0.3810	0.4690	0.4520	0.2030	0.1870	0.1300	0.0200
#10	0.1900	24	32	0.3750	0.3650	0.4330	0.4160	0.5000	0.4800	0.2190	0.2030	0.1300	0.0300
#12	0.2160	24	28	0.4380	0.4280	0.5050	0.4880	0.5940	0.5740	0.2360	0.2220	0.1400	0.0400
1/4	0.2500	20	28	0.4380	0.4280	0.5050	0.4880	0.5940	0.5740	0.2360	0.2222	0.1400	0.0400
5/16	0.3125	18	24	0.5000	0.4890	0.5770	0.5570	0.6800	0.6600	0.2830	0.2680	0.1700	0.0400
3/8	0.3750	16	24	0.5620	0.5510	0.6500	0.6280	0.7500	0.7280	0.3470	0.3300	0.2300	0.0400
7/16	0.4375	14	20	0.6880	0.6750	0.7940	0.7680	0.9370	0.9100	0.3950	0.3750	0.2600	0.0400
1/2	0.5000	13	20	0.7500	0.7360	0.8660	0.8400	1.0310	1.0000	0.4580	0.4370	0.3100	0.0500
9/16	0.5625	12	18	0.8750	0.8610	1.0100	0.9820	1.1880	1.1550	0.5060	0.4830	0.3500	0.0500
5/8	0.6250	11	18	0.9380	0.9220	1.0830	1.0510	1.2810	1.2480	0.5690	0.5450	0.4000	0.0500
3/4	0.7500	10	16	1.1250	1.0880	1.2990	1.2400	1.5000	1.4600	0.6750	0.6270	0.4600	0.0600
7/8	0.8750	9	14	1.1790	1.1660	1.3610	1.2950	1.6820	*	0.7860	0.7420	*	0.1100

All dimensions are in inches.

SS Serrated Flange Locking Nut

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Diameter	Thread Pitch	Width Across Flats	Height of Nut	Item #	Availability	Price	Quantity
1/4	20	7/16	0.2222	NFLS0250000	In Stock	$0.10465/EA	EA	EA
5/16	18	1/2	0.2680	NFLS0310000	In Stock	$0.23024/EA	EA	EA
3/8	16	9/16	0.33	NFLS0370000	In Stock	$0.17577/EA	EA	EA
3/8	24	9/16	0.33	NFLS037NF00	In Stock	$0.5914/EA	EA	EA
1/2	13	3/4	0.4380	NFLS0500000	3-5 Working Days	$1.51269/EA	EA	EA

SS Serrated Flange Locking Nut

Technical Data

Tab 1

Governing Standards18-8 Stainless Steel

Tab 4

Dimensional SpecificationsCase Hardened

Product Specification

Grade

Diameter

Thread Pitch

Thread Type

Width Across Flats