What are the different types of locknuts?

Raptor Supplies offers locknuts with nylon inserts, jam nuts and bearings.

How do locknuts with nylon inserts work?

These locknuts have a nylon insert at the top that creates tension between the nut and the mating component's threads. When threaded onto a shaft or rod, the nut will spin freely until the threads on the host part engage the nylon insert. The mating shaft's threads will displace the nylon insert and create resistance. This resistance prevents the locknut from being moved accidentally. After repeated removal & installation, the insert can wear and become less effective. Replace the nut if it needs to be removed during component disassembly for maximum holding power.

How to install a locknut with nylon inserts?

The locking end of a prevailing torque locknut is installed in a manner such that it engages the mating threads. When installing, the nut should be threaded on freely until the host component's mating threads engage the nylon insert.

How do jam nuts work?

Jam nuts use opposing friction against another jam nut or a standard hex nut to lock into place on a threaded shaft or rod. Tighten the first jam nut and then the second nut, which is tightened or jammed against the first nut. It is difficult to properly torque both nuts in this configuration, making it unsuitable for critical applications involving heavy loads.

How do bearing locknuts work?

Bearing locknuts, like castellated nuts, require a positive locking action to lock in place. Bearing locknuts and bearing lock washers are used to achieve locking. The machined grooves in the nut's face provide a mating surface for the lock washer's tangs to fold into, locking both components in place.

Locknuts - Page 2 | Raptor Supplies United Kingdom

APPROVED VENDOR -

Zinc Plated Grade 2 Steel Heavy Hex Nylon Insert Locknuts

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Style	Model	Thread Size	Hex Width	Nut Height	Hardness	Nut Type	Type	Material	Grade	Price (inc. VAT)	Pkg. Qty.
A	U12601.150.0001	1 1/2"-6	2 3/8"	1.667"	-	Nylon Insert	Heavy Hex	Steel	Grade 2	£79.83	5
B	U12705.150.0001	1 1/2"-6	2 3/8"	1.667"	-	Nylon Insert	Heavy Hex	Steel	Grade 2	£128.49	5
A	U12601.125.0001	1 1/4"-7	2"	1.428"	-	Nylon Insert	Heavy Hex	Steel	Grade 2	£54.16	5
A	U12705.125.0001	1 1/4"-7	2"	1.428"	-	Nylon Insert	Heavy Hex	Steel	Grade 2	£90.94	5
C	U12601.050.0001	1/2"-13	7/8"	0.609"	Rockwell B68-C32	Nylon Insert	Heavy Hex	Steel	Grade 2	£15.39	25
D	U12601.025.0001	1/4"-20	1/2"	0.238"	Rockwell B68-C32	Nylon Insert	Heavy Hex	Steel	Grade 2	£12.90	100
E	B12601.025.0001	1/4"-20	7/16"	-	-	Nylon Insert	Heavy Hex	Steel	Grade 2	-	1500	RFQ
A	U12601.075.0001	3/4"-10	1 1/4"	0.888"	-	Nylon Insert	Heavy Hex	Steel	Grade 2	£14.82	10
A	U12601.037.0001	3/8"-16	11/16"	15/32"	Rockwell B68-C32	Nylon Insert	Heavy Hex	Steel	Grade 2	£17.57	50
F	B12601.037.0001	3/8"-16	9/16"	-	-	Nylon Insert	Heavy Hex	Steel	Grade 2	-	550	RFQ
A	U12601.062.0001	5/8"-11	1 1/16"	0.765"	Rockwell B68-C32	Nylon Insert	Heavy Hex	Steel	Grade 2	£13.16	10
G	U12601.031.0001	5/16"-18	9/16"	23/64"	Rockwell B68-C32	Nylon Insert	Heavy Hex	Steel	Grade 2	£18.59	100
A	U12705.087.0001	7/8"-9	1 7/16"	1"	-	Nylon Insert	Heavy Hex	Steel	Grade 2	£25.75	5
H	U12601.056.0001	9/16"-12	15/16"	21/32"	Rockwell B68-C32	Nylon Insert	Heavy Hex	Steel	Grade 2	£110.00	25

APPROVED VENDOR -

Plain Grade 18-8 Stainless Steel Standard Hex Nylon Insert Locknuts

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Style	Model	Thread Size	Hex Width	Nut Height	Temp. Range	Hardness	Grade	Nut Type	Type	Price (inc. VAT)	Pkg. Qty.
A	U51738.008.0001	#2-56	1/4"	9/64"	-0°F to +250°F	Rockwell B80-C32	Grade 18-8	Nylon Insert	Standard Hex	£6.32	50
B	U51738.009.0001	#3-48	1/4"	9/64"	-0°F to +250°F	Rockwell B80-C32	Grade 18-8	Nylon Insert	Standard Hex	£7.93	50
A	U51738.011.0001	#4-40	1/4"	1/6"	-	-	Grade 18-8	Nylon Insert	Standard Hex	£3.30	50
C	U51730.011.0001	#4-40	1/4"	5/32"	-58°F to +302°F	Rockwell B80-C32	Grade 18-8	Nylon Insert	Standard Hex	£6.29	50
D	U51738.012.0001	#5-40	5/16"	1/6"	-	-	Grade 18-8	Nylon Insert	Standard Hex	£5.00	50
A	U51730.012.0001	#5-40	1/4"	0.163"	-	Rockwell B80-C32	Grade 18-8	Nylon Insert	Standard Hex	£5.18	50
A	U51738.013.0001	#6-32	5/16"	3/16"	-	-	Grade 18-8	Nylon Insert	Standard Hex	£3.26	50
E	U51738.016.0001	#8-32	11/32"	1/4"	-	-	Grade 18-8	Nylon Insert	Standard Hex	£3.07	50
F	U51738.019.0001	#10-24	3/8"	1/4"	-	-	Grade 18-8	Nylon Insert	Standard Hex	£3.11	50
G	B51411.019.0002	#10-32	3/8"	-	-	-	Grade 18-8	Nylon Insert	Standard Hex	£720.77	4
H	U51411.019.0002	#10-32	3/8"	1/4"	-	-	Grade 18-8	Nylon Insert	Standard Hex	£3.52	50
I	U51422.019.0002	#10-32	3/8"	3/16"	-0°F to +250°F	Rockwell B80-C32	Grade 18-8	Nylon Insert	Standard Hex	£5.49	50
J	U51738.150.0001	1 1/2"-6	2 3/16"	1.667"	-	-	Grade 18-8	Nylon Insert	Standard Hex	£1.60	2
K	U51738.125.0001	1 1/4"-7	1 13/16"	1.428"	-	-	Grade 18-8	Nylon Insert	Standard Hex	£63.06	2
L	U51738.112.0001	1 1/8"-7	1 5/8"	1 9/32"	-	-	Grade 18-8	Nylon Insert	Standard Hex	£101.16	2
M	U51738.100.0001	1"-8	1 7/16"	1 1/8"	-58°F to +302°F	-	Grade 18-8	Nylon Insert	Standard Hex	£76.47	5
A	U51411.101.0002	1"-14	1 7/16"	1 1/8"	-	-	Grade 18-8	Nylon Insert	Standard Hex	£51.42	5
N	U51730.050.0001	1/2"-13	3/4"	5/16"	-0°F to +250°F	Rockwell B80-C32	Grade 18-8	Nylon Insert	Standard Hex	£9.01	10
A	U51738.050.0001	1/2"-13	3/4"	3/5"	-58°F to +302°F	-	Grade 18-8	Nylon Insert	Standard Hex	£3.96	10
A	U51422.050.0002	1/2"-20	3/4"	5/16"	-0°F to +250°F	Rockwell B80-C32	Grade 18-8	Nylon Insert	Standard Hex	£15.71	10
O	B51411.050.0002	1/2"-20	3/4"	-	-	-	Grade 18-8	Nylon Insert	Standard Hex	£305.01	510
A	U51411.050.0002	1/2"-20	3/4"	3/5"	-	-	Grade 18-8	Nylon Insert	Standard Hex	£6.63	10
P	U51730.025.0001	1/4"-20	7/16"	13/64"	-0°F to +250°F	Rockwell B80-C32	Grade 18-8	Nylon Insert	Standard Hex	£5.35	50
Q	U51738.025.0001	1/4"-20	7/16"	1/4"	-58°F to +302°F	-	Grade 18-8	Nylon Insert	Standard Hex	£4.24	50
R	U51422.025.0002	1/4"-28	7/16"	13/64"	-0°F to +250°F	Rockwell B80-C32	Grade 18-8	Nylon Insert	Standard Hex	£6.32	50

APPROVED VENDOR -

Black Oxide Grade 8 Steel Standard Hex Nylon Insert Locknuts

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Style	Model	Thread Size	Hex Width	Nut Height	Hardness	Temp. Range	Nut Type	Type	Material	Price (inc. VAT)	Pkg. Qty.
A	B12411.150.0001	1 1/2"-6	2 1/4"	-	-	-	Nylon Insert	Standard Hex	Steel	-	20	RFQ
B	U12411.150.0001	1 1/2"-6	2 1/4"	1.667"	-	-	Nylon Insert	Standard Hex	Steel	£90.83	5
C	U12421.150.0002	1 1/2"-12	2 1/4"	1.667"	-	-	Nylon Insert	Standard Hex	Steel	£143.64	5
D	U12411.125.0001	1 1/4"-7	1 7/8"	1.428"	-	-	Nylon Insert	Standard Hex	Steel	£49.82	5
E	U12421.125.0002	1 1/4"-12	1 7/8"	1.428"	-	-	Nylon Insert	Standard Hex	Steel	£69.96	5
C	U12411.112.0001	1 1/8"-7	1 11/16"	1 9/32"	-	-	Nylon Insert	Standard Hex	Steel	£43.49	5
F	U12421.112.0002	1 1/8"-12	1 11/16"	1 9/32"	-	-	Nylon Insert	Standard Hex	Steel	£55.01	5
G	U12411.100.0001	1"-8	1 7/16"	1 3/64"	Rockwell C26-C34	-0°F to +250°F	Nylon Insert	Standard Hex	Steel	£8.23	5
C	U12421.101.0002	1"-14	1 7/16"	1 3/64"	Rockwell C26-C34	-0°F to +250°F	Nylon Insert	Standard Hex	Steel	£21.01	5
H	U12411.050.0001	1/2"-13	3/4"	3/5"	-	-	Nylon Insert	Standard Hex	Steel	£5.52	25
I	B12411.050.0001	1/2"-13	3/4"	-	-	-	Nylon Insert	Standard Hex	Steel	-	500	RFQ
C	U12421.050.0002	1/2"-20	3/4"	3/5"	-	-	Nylon Insert	Standard Hex	Steel	£16.38	25
J	U12421.025.0002	1/4"-28	7/16"	5/16"	Rockwell C24-C32	-	Nylon Insert	Standard Hex	Steel	£12.78	100
C	U12411.075.0001	3/4"-10	1 1/8"	57/64"	-	-	Nylon Insert	Standard Hex	Steel	£6.82	10
K	B12411.075.0001	3/4"-10	1 1/8"	-	-	-	Nylon Insert	Standard Hex	Steel	-	180	RFQ
L	U12421.075.0002	3/4"-16	1 1/8"	57/64"	-	-	Nylon Insert	Standard Hex	Steel	£16.93	10
M	B12421.075.0002	3/4"-16	1 1/8"	-	-	-	Nylon Insert	Standard Hex	Steel	-	180	RFQ
C	U12411.037.0001	3/8"-16	7/8"	21/32"	-	-58°F to +302°F	Nylon Insert	Standard Hex	Steel	£5.86	50
C	U12421.037.0002	3/8"-24	7/16"	15/64"	-	-58°F to +302°F	Nylon Insert	Standard Hex	Steel	£34.94	50
N	B12411.062.0001	5/8"-11	15/16"	-	-	-	Nylon Insert	Standard Hex	Steel	-	260	RFQ
C	U12421.062.0002	5/8"-18	15/16"	0.765"	-	-58°F to +302°F	Nylon Insert	Standard Hex	Steel	£12.08	10
O	B12411.031.0001	5/16"-18	1/2"	-	-	-	Nylon Insert	Standard Hex	Steel	-	1800	RFQ
P	U12411.031.0001	5/16"-18	1/2"	11/32"	Rockwell C24-C32	-	Nylon Insert	Standard Hex	Steel	£5.22	100
Q	U12421.031.0002	5/16"-24	1/2"	11/32"	Rockwell C24-C32	-	Nylon Insert	Standard Hex	Steel	£15.37	100
R	U12411.087.0001	7/8"-9	1 5/16"	0.999"	-	-	Nylon Insert	Standard Hex	Steel	£4.95	5

APPROVED VENDOR -

Zinc Plated Grade 5 Steel Standard Hex Nylon Insert Locknuts

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Style	Model	Thread Size	Hex Width	Nut Height	Hardness	Class	Nut Type	Type	Material	Price (inc. VAT)	Pkg. Qty.
A	U12348.100.0001	1"-8	1 1/2"	1.124"	-	Not Applicable	Nylon Insert	Standard Hex	Steel	£14.05	5
B	5TJD6	1/2"-13	3/4"	1 9/32"	Rockwell C32	Class 5	Nylon Insert	Standard Hex	Steel	£29.94	100
C	U12348.050.0001	1/2"-13	3/4"	3/5"	-	Not Applicable	Nylon Insert	Standard Hex	Steel	£4.93	25
D	U12353.050.0002	1/2"-20	3/4"	3/5"	-	Not Applicable	Nylon Insert	Standard Hex	Steel	£13.01	25
E	U12348.025.0001	1/4"-20	7/16"	5/16"	Rockwell C32	Not Applicable	Nylon Insert	Standard Hex	Steel	£6.90	100
F	B12348.025.0001	1/4"-20	7/16"	-	-	-	Nylon Insert	Standard Hex	Steel	£222.37	2
G	U12353.025.0002	1/4"-28	7/16"	5/16"	Rockwell C32	Not Applicable	Nylon Insert	Standard Hex	Steel	£12.46	100
H	B12348.075.0001	3/4"-10	1 1/8"	-	-	-	Nylon Insert	Standard Hex	Steel	£133.04	180
I	12P623	3/4"-10	1 1/16"	7/8"	Rockwell 32	-	Nylon Insert	Standard Hex	Steel	£8.92	20
G	U12348.075.0001	3/4"-10	1 1/8"	0.888"	-	Not Applicable	Nylon Insert	Standard Hex	Steel	£9.13	10
J	U12353.075.0002	3/4"-16	1 1/8"	0.888"	-	Not Applicable	Nylon Insert	Standard Hex	Steel	£6.18	10
G	U12348.037.0001	3/8"-16	9/16"	15/32"	Rockwell C28	Not Applicable	Nylon Insert	Standard Hex	Steel	£5.16	50
K	B12348.037.0001	3/8"-16	9/16"	-	-	-	Nylon Insert	Standard Hex	Steel	-	1	RFQ
L	U12353.037.0002	3/8"-24	9/16"	15/32"	Rockwell C28	Not Applicable	Nylon Insert	Standard Hex	Steel	£29.60	50
M	B12348.062.0001	5/8"-11	15/16"	-	-	-	Nylon Insert	Standard Hex	Steel	£192.46	260
G	U12348.062.0001	5/8"-11	15/16"	0.765"	Rockwell C28	Not Applicable	Nylon Insert	Standard Hex	Steel	£5.11	10
N	U12353.062.0002	5/8"-18	15/16"	0.765"	-	Not Applicable	Nylon Insert	Standard Hex	Steel	£8.18	10
O	B12353.062.0002	5/8"-18	15/16"	-	-	-	Nylon Insert	Standard Hex	Steel	-	260	RFQ
P	U12348.031.0001	5/16"-18	1/2"	11/32"	Rockwell C32	Not Applicable	Nylon Insert	Standard Hex	Steel	£7.12	100
Q	B12348.031.0001	5/16"-18	1/2"	-	-	-	Nylon Insert	Standard Hex	Steel	-	1800	RFQ
R	U12353.031.0002	5/16"-24	1/2"	11/32"	Rockwell C32	Not Applicable	Nylon Insert	Standard Hex	Steel	£14.35	100
G	U12348.087.0001	7/8"-9	1 5/16"	0.999"	-	Not Applicable	Nylon Insert	Standard Hex	Steel	£5.22	5
S	U12348.043.0001	7/16"-14	11/16"	3/4"	-	Not Applicable	Nylon Insert	Standard Hex	Steel	£4.67	25
T	U12353.043.0002	7/16"-20	11/16"	3/4"	-	Not Applicable	Nylon Insert	Standard Hex	Steel	£6.88	25
G	U12348.056.0001	9/16"-12	7/8"	21/32"	-	Not Applicable	Nylon Insert	Standard Hex	Steel	£33.73	25

METRIC BLUE -

Metric Blue Class 10 Steel Standard Hex Top Lock Distorted Thread Locknuts

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Style	Model	Thread Size	Hex Width	Nut Height	Hardness	Nut Type	Type	Material	Class	Price (inc. VAT)	Pkg. Qty.
A	UST202389	M10 x 1.5	17 mm	10 mm	Rockwell C27-C35	Top Lock Distorted Thread	Top Lock	Steel	Class 10	£110.85	100
B	UST202391	M16 x 2	24 mm	16 mm	Rockwell C27-C35	Top Lock Distorted Thread	Top Lock	Steel	Class 10	£68.60	50

FOREVERBOLT -

NL-19 Grade A4 Stainless Steel Flange Hex Serrated Locknuts

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Style	Model	Thread Size	Hex Width	Nut Height	Nut Type	Type	Material	Grade	Price (inc. VAT)	Pkg. Qty.
A	FB3FHNM6P50	M6 x 1	14.8 mm	10 mm	Serrated	Flange	Stainless Steel	Grade A4	£91.85	50
B	FB3FHNM8P25	M8 x 1.25	18 mm	13 mm	Serrated	Flange	Stainless Steel	Grade A4	£74.90	25
C	FB3FHNM10P10	M10 x 1.5	22 mm	10 mm	Serrated	Flange	Stainless Steel	Grade A4	£61.17	10
D	FB3FHNM12P10	M12 x 1.75	26.7 mm	18 mm	Serrated	Flange	Stainless Steel	Grade A4	£75.84	10

FOREVERBOLT -

NL-19 Grade 18-8 Stainless Steel Jam Hex Nylon Insert Locknuts

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Style	Model	Thread Size	Hex Width	Nut Height	Temp. Range	Nut Type	Type	Material	Grade	Price (inc. VAT)	Pkg. Qty.
A	FBLN632P50	#6-32	5/16"	3/16"	-0°F to +480°F	Nylon Insert	Nylon Insert Locknut	Stainless Steel	Grade 18-8	£41.46	50
B	FBLN832P50	#8-32	11/32"	15/64"	-0°F to +480°F	Nylon Insert	Nylon Insert Locknut	Stainless Steel	Grade 18-8	£44.87	50
C	FBLN1024P50	#10-24	3/8"	15/64"	-0°F to +480°F	Nylon Insert	Nylon Insert Locknut	Stainless Steel	Grade 18-8	£45.46	50
D	FBLN1032P50	#10-32	3/8"	15/64"	-0°F to +480°F	Nylon Insert	Nylon Insert Locknut	Stainless Steel	Grade 18-8	£45.68	50
E	FBLN18P5	1"-8	1 7/16"	1 1/16"	-0°F to +480°F	Nylon Insert	Nylon Insert Locknut	Stainless Steel	Grade 18-8	£129.12	5
F	FBLN1213P25	1/2"-13	3/4"	37/64"	-0°F to +480°F	Nylon Insert	Nylon Insert Locknut	Stainless Steel	Grade 18-8	£61.11	25
G	FBLN3410P20	3/4"-10	1 1/16"	51/64"	-0°F to +480°F	Nylon Insert	Nylon Insert Locknut	Stainless Steel	Grade 18-8	£136.96	20
H	FBLN3816P50	3/8"-16	9/16"	29/64"	-0°F to +480°F	Nylon Insert	Nylon Insert Locknut	Stainless Steel	Grade 18-8	£69.53	50
I	FBLN5811P25	5/8"-11	15/16"	49/64"	-0°F to +480°F	Nylon Insert	Nylon Insert Locknut	Stainless Steel	Grade 18-8	£107.67	25
J	FBLN789P5	7/8"-9	1 1/4"	1"	-0°F to +480°F	Nylon Insert	Nylon Insert Locknut	Stainless Steel	Grade 18-8	£100.96	5
K	FBLN71614P25	7/16"-14	5/8"	29/64"	-0°F to +480°F	Nylon Insert	Nylon Insert Locknut	Stainless Steel	Grade 18-8	£50.41	25

APPROVED VENDOR -

Plain Grade 18-8 Stainless Steel Flange Hex Lock Nut with External Tooth Lock Washers

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Style	Model	Thread Size	Hex Width	Nut Height	Washer Outside Dia.	Hardness	Nut Type	Type	Material	Price (inc. VAT)	Pkg. Qty.
A	HFNIX025-050P	1/4"-20	7/16"	15/64"	0.578"	Rockwell B95-C32	With External Tooth Lock Washer	Flange	Stainless Steel	£17.26	50
B	HFNIX031-025P	5/16"-18	1/2"	9/32"	0.656"	Rockwell B95-C32	With External Tooth Lock Washer	Flange	Stainless Steel	£13.65	25

GRAINGER -

Zinc Plated Grade A Steel Standard Hex Center Lock Distorted Thread Locknuts

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Style	Model	Thread Size	Hex Width	Nut Height	Nut Type	Type	Material	Grade	Class	Price (inc. VAT)	Pkg. Qty.
A	CLNI20750-025P	3/4"-10	1 1/8"	41/64"	Center Lock Distorted Thread	Standard Hex Center Lock	Steel	Grade A	Not Applicable	£27.10	25
B	CLNI20870-025P	7/8"-9	1 5/16"	49/64"	Center Lock Distorted Thread	Standard Hex Center Lock	Steel	Grade A	Not Applicable	£60.30	25
C	CLNI20560-050P	9/16"-12	7/8"	31/64"	Center Lock Distorted Thread	Standard Hex Center Lock	Steel	Grade A	Not Applicable	£16.77	50

FOREVERBOLT -

NL-19 Grade 316 Stainless Steel Flange Hex Serrated Locknuts

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Style	Model	Thread Size	Hex Width	Nut Height	Nut Type	Type	Material	Grade	Price (inc. VAT)	Pkg. Qty.
A	FB3FHN632P25	#6-32	15/16"	11/64"	Serrated	Flange	Stainless Steel	Grade 316	£67.58	25
B	FB3FHN832P50	#8-32	11/32"	11/64"	Serrated	Flange	Stainless Steel	Grade 316	£90.35	50
C	FB3FHN1024P25	#10-24	3/8"	7/32"	Serrated	Flange	Stainless Steel	Grade 316	£52.67	25
D	FB3FHN1032P25	#10-32	3/8"	7/32"	Serrated	Flange	Stainless Steel	Grade 316	£52.93	25
E	FB3FHN1213P10	1/2"-13	3/4"	29/64"	Serrated	Flange	Stainless Steel	Grade 316	£54.39	10
F	FB3FHN1420P25	1/4"-20	7/16"	15/64"	Serrated	Flange	Stainless Steel	Grade 316	£37.59	25
G	FB3FHN3816P25	3/8"-16	9/16"	11/32"	Serrated	Flange	Stainless Steel	Grade 316	£54.84	25
H	FB3FHN51618P25	5/16"-18	1/2"	9/32"	Serrated	Flange	Stainless Steel	Grade 316	£44.09	25

FLEXLOC -

Plain Grade 18-8 Stainless Steel Standard Light Hex Flexible Top Locknuts

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Style	Model	Thread Size	Hex Width	Nut Height	Type	Nut Type	Material	Grade	Price (inc. VAT)	Pkg. Qty.
A	50FA-256	#2-56	1/4"	0.155"	Top Lock	Flexible Top	Stainless Steel	Grade 18-8	£111.84	25
B	50FA-632	#6-32	5/16"	0.18"	Standard Light Hex	Flexible Top	Stainless Steel	Grade 18-8	£111.84	25
C	50FA-832	#8-32	3/8"	0.243"	Top Lock	Flexible Top	Stainless Steel	Grade 18-8	£221.54	50
D	50FAF-813	1/2"-13	3/4"	0.602"	Top Lock	Flexible Top	Stainless Steel	Grade 18-8	£17.91	10
E	50FC-820	1/2"-20	3/4"	0.602"	Top Lock	Flexible Top	Stainless Steel	Grade 18-8	£248.06	10
F	50FA-420	1/4"-20	7/16"	0.29"	Standard Light Hex	Flexible Top	Stainless Steel	Grade 18-8	£135.16	25
G	50FC-428	1/4"-28	7/16"	8/25"	Top Lock	Flexible Top	Stainless Steel	Grade 18-8	£276.57	50
H	50FC-624	3/8"-24	9/16"	0.462"	Top Lock	Flexible Top	Stainless Steel	Grade 18-8	£284.25	25
I	50FAF-518	5/16"-18	1/2"	0.353"	Top Lock	Flexible Top	Stainless Steel	Grade 18-8	£12.70	25
J	50FC-524	5/16"-24	1/2"	0.353"	Top Lock	Flexible Top	Stainless Steel	Grade 18-8	£330.74	25

FLEXLOC -

Plain Grade 2 Steel Thin Heavy Hex Flexible Top Locknuts

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F

G

Style	Model	Thread Size	Hex Width	Nut Height	Nut Type	Type	Material	Grade	Price (inc. VAT)	Pkg. Qty.
A	20FK-813	1/2"-13	13/16"	0.328"	Flexible Top	Top Lock Jam	Steel	Grade 2	£241.82	100
B	20FKC-420	1/4"-20	1/2"	7/32"	Flexible Top	Top Lock Jam	Steel	Grade 2	£114.00	125
C	20FK-616	3/8"-16	5/8"	0.282"	Flexible Top	Top Lock Jam	Steel	Grade 2	£151.79	100
D	30FK-1011	5/8"-11	1"	0.399"	Flexible Top	Top Lock Jam	Steel	Grade 2	£261.38	50
E	20FK-518	5/16"-18	9/16"	17/64"	Flexible Top	Top Lock Jam	Steel	Grade 2	£254.52	100
F	30FK-1409	7/8"-9	1 5/16"	0.477"	Flexible Top	Top Lock Jam	Steel	Grade 2	£292.85	20
G	20FK-714	7/16"-14	3/4"	0.328"	Flexible Top	Top Lock Jam	Steel	Grade 2	£208.95	100

GRAINGER -

Zinc Plated Class 8 Steel Flange Hex Serrated Locknuts

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H

Style	Model	Thread Size	Hex Width	Nut Height	Washer Outside Dia.	Nut Type	Type	Material	Class	Price (inc. VAT)	Pkg. Qty.
A	M11610.040.0001	M4 x 0.7	7 mm	4.5 mm	9.6 mm	Serrated	Flange	Steel	Class 8	£4.43	100
B	M11610.050.0001	M5 x 0.8	8 mm	5 mm	11.8 mm	Serrated	Flange	Steel	Class 8	£4.66	100
C	M11610.060.0001	M6 x 1	10 mm	6 mm	14.2 mm	Serrated	Flange	Steel	Class 8	£12.17	100
D	M11610.080.0001	M8 x 1.25	13 mm	8 mm	17.9 mm	Serrated	Flange	Steel	Class 8	£13.76	100
E	M11610.100.0001	M10 x 1.5	15 mm	10 mm	21.8 mm	Serrated	Flange	Steel	Class 8	£23.55	100
F	M11610.120.0001	M12 x 1.75	18 mm	12 mm	26 mm	Serrated	Flange	Steel	Class 8	£46.06	100
G	M11610.140.0001	M14 x 2	21 mm	14 mm	29.9 mm	Serrated	Flange	Steel	Class 8	£35.98	50
H	M11610.160.0001	M16 x 2	24 mm	16 mm	34.5 mm	Serrated	Flange	Steel	Class 8	£46.39	50

APPROVED VENDOR -

Coarse Standard Hex Locknuts with Washer

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Style	Model	Thread Size	Hex Width	Nut Height	Washer Outside Dia.	Hardness	Material	Class	Nut Type	Price (inc. VAT)	Pkg. Qty.
A	KEPI0-80-100P	#8-32	11/32"	1/8"	3/8"	Rockwell B68-C32	Stainless Steel	Not Applicable	With External Tooth Lock Washer	£7.85	100
B	KEPI-100-100P	#10-24	3/8"	1/8"	13/32"	Rockwell B68-C32	Steel	Not Applicable	With External Tooth Lock Washer	£7.13	100
C	KEPI0250-100P	1/4"-20	7/16"	15/64"	1/2"	Rockwell B68-C32	Steel	Class 8.8	With External Tooth Lock Washer	£10.36	100

APPROVED VENDOR -

Plain Grade 2H Steel Standard Hex Slotted Castle Locknuts

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B

Style	Model	Thread Size	Hex Width	Nut Height	Hardness	Slot Depth	Slot Width	Nut Type	Type	Price (inc. VAT)	Pkg. Qty.
A	352538G	1 3/4"-5	2 3/4"	1 23/32"	Rockwell B95-C35	1 6/25"	13/25"	Slotted Castle	Standard Hex	£198.72	5
B	352308G	1"-8	1 5/8"	63/64"	Rockwell C24-C35	18/25"	0.3"	Slotted Castle	Standard Hex	£46.97	5
A	352228G	3/4"-10	1 1/4"	47/64"	Rockwell C24-C35	0.49"	6/25"	Slotted Castle	Standard Hex	£41.58	10
A	352188G	5/8"-11	1 1/16"	39/64"	Rockwell C24-C35	2/5"	6/25"	Slotted Castle	Standard Hex	£106.35	25
A	352258G	7/8"-9	1 7/16"	55/64"	Rockwell C24-C35	0.62"	6/25"	Slotted Castle	Standard Hex	£49.92	10

APPROVED VENDOR -

Zinc Plated Grade 2 Steel Flange Hex Nylon Insert Locknuts

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Style	Model	Thread Size	Hex Width	Nut Height	Nut Type	Type	Material	Grade	Class	Price (inc. VAT)	Pkg. Qty.
A	4CAN8	#10-24	3/8"	1/4"	Nylon Insert	Flange	Steel	Grade 2	Not Applicable	£19.16	100
B	4CAN9	#10-32	3/8"	1/4"	Nylon Insert	Flange	Steel	Grade 2	Not Applicable	£16.94	100
C	4CAP4	1/2"-13	3/4"	9/16"	Nylon Insert	Flange	Steel	Grade 2	Not Applicable	£13.92	25
A	4CAP1	1/4"-20	7/16"	5/16"	Nylon Insert	Flange	Steel	Grade 2	Not Applicable	£15.98	100
D	4CAP6	3/4"-10	1 1/8"	13/16"	Nylon Insert	Flange	Steel	Grade 2	Not Applicable	£16.71	5
E	4CAP3	3/8"-16	9/16"	7/16"	Nylon Insert	Flange	Steel	Grade 2	Not Applicable	£14.84	50
A	4CAP2	5/16"-18	1/2"	3/8"	Nylon Insert	Flange	Steel	Grade 2	Not Applicable	£17.00	100

APPROVED VENDOR -

Phosphate Grade C Steel Flange Hex Top Lock Distorted Thread Locknuts

A

Style	Model	Thread Size	Hex Width	Nut Height	Washer Outside Dia.	Nut Type	Type	Material	Grade	Price (inc. VAT)	Pkg. Qty.
A	U12120.100.0001	1"-8	1 1/2"	1.018"	-	Top Lock Distorted Thread	Flange Hex Top Lock	Steel	Grade C	£107.10	5
A	U12120.050.0001	1/2"-13	3/4"	27/64"	1.07"	Top Lock Distorted Thread	Flange Hex Top Lock	Steel	Grade C	£23.48	25
A	U12120.025.0001	1/4"-20	7/16"	0.288"	9/16"	Top Lock Distorted Thread	Flange Hex Top Lock	Steel	Grade C	£29.50	100
A	U12120.075.0001	3/4"-10	1 1/8"	53/64"	1.585"	Top Lock Distorted Thread	Flange Hex Top Lock	Steel	Grade C	£17.80	10
A	U12120.037.0001	3/8"-16	9/16"	27/64"	0.81"	Top Lock Distorted Thread	Flange Hex Top Lock	Steel	Grade C	£25.69	50
A	U12120.087.0001	7/8"-9	1 5/16"	0.922"	1.578"	Top Lock Distorted Thread	Flange Hex Top Lock	Steel	Grade C	£78.23	5
A	U12120.043.0001	7/16"-14	11/16"	0.463"	15/16"	Top Lock Distorted Thread	Flange Hex Top Lock	Steel	Grade C	£47.08	25

FOREVERBOLT -

NL-19 Grade A2 Stainless Steel Standard Hex Nylon Insert Locknuts

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Style	Model	Thread Size	Hex Width	Nut Height	Temp. Range	Nut Type	Type	Material	Grade	Price (inc. VAT)	Pkg. Qty.
A	FBLNM3P100	M3 x 0.5	5.5 mm	4 mm	-0°F to +480°F	Nylon Insert	Nylon Insert Locknut	Stainless Steel	Grade A2	£39.30	100
B	FBLNM4P100	M4 x 7	7 mm	5 mm	-0°F to +480°F	Nylon Insert	Nylon Insert Locknut	Stainless Steel	Grade A2	£42.73	100
C	FBLNM5P100	M5 x 0.8	8 mm	5 mm	-0°F to +480°F	Nylon Insert	Nylon Insert Locknut	Stainless Steel	Grade A2	£44.98	100
D	FBLNM6P50	M6 x 1	10 mm	6 mm	-0°F to +480°F	Nylon Insert	Nylon Insert Locknut	Stainless Steel	Grade A2	£32.66	50
E	FBLNM8P50	M8 x 1.25	13 mm	8 mm	-0°F to +480°F	Nylon Insert	Nylon Insert Locknut	Stainless Steel	Grade A2	£54.05	50
F	FBLNM10P25	M10 x 1.5	17 mm	10 mm	-0°F to +480°F	Nylon Insert	Nylon Insert Locknut	Stainless Steel	Grade A2	£35.94	25
G	FBLNM12P25	M12 x 1.75	19 mm	12 mm	-0°F to +480°F	Nylon Insert	Nylon Insert Locknut	Stainless Steel	Grade A2	£56.61	25
H	FBLNM16P5	M16 x 2	24 mm	16 mm	-0°F to +480°F	Nylon Insert	Nylon Insert Locknut	Stainless Steel	Grade A2	£16.73	5
I	FBLNM20P5	M20 x 2.5	30 mm	22 mm	-0°F to +480°F	Nylon Insert	Nylon Insert Locknut	Stainless Steel	Grade A2	£36.73	5

FOREVERBOLT -

NL-19 Grade A4 Stainless Steel Standard Hex Nylon Insert Locknuts

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Style	Model	Thread Size	Hex Width	Nut Height	Temp. Range	Nut Type	Type	Material	Grade	Price (inc. VAT)	Pkg. Qty.
A	FB3LNM3P100	M3 x 0.5	5.5 mm	4 mm	-0°F to +480°F	Nylon Insert	Nylon Insert Locknut	Stainless Steel	Grade A4	£62.13	100
B	FB3LNM4P100	M4 x 0.7	7 mm	5 mm	-0°F to +480°F	Nylon Insert	Nylon Insert Locknut	Stainless Steel	Grade A4	£64.46	100
C	FB3LNM5P100	M5 x 0.08	8 mm	5 mm	-0°F to +480°F	Nylon Insert	Nylon Insert Locknut	Stainless Steel	Grade A4	£67.26	100
D	FB3LNM6P50	M6 x 1	10 mm	6 mm	-0°F to +480°F	Nylon Insert	Nylon Insert Locknut	Stainless Steel	Grade A4	£43.89	50
E	FB3LNM8P50	M8 x 1.25	13 mm	8 mm	-0°F to +480°F	Nylon Insert	Nylon Insert Locknut	Stainless Steel	Grade A4	£61.47	50
F	FB3LNM10P25	M10 x 1.5	17 mm	10 mm	-0°F to +480°F	Nylon Insert	Nylon Insert Locknut	Stainless Steel	Grade A4	£54.77	25
G	FB3LNM12P25	M12 x 1.75	19 mm	12 mm	-0°F to +480°F	Nylon Insert	Nylon Insert Locknut	Stainless Steel	Grade A4	£68.44	25
H	FB3LNM16P5	M16 x 2	24 mm	16 mm	-0°F to +480°F	Nylon Insert	Nylon Insert Locknut	Stainless Steel	Grade A4	£32.92	5
I	FB3LNM20P5	M20 x 2.5	30 mm	22 mm	-0°F to +480°F	Nylon Insert	Nylon Insert Locknut	Stainless Steel	Grade A4	£58.48	5

FLEXLOC -

Plain Grade 18-8 Stainless Steel Thin Heavy Hex Flexible Top Locknuts

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C

Style	Model	Thread Size	Hex Width	Nut Height	Nut Type	Type	Material	Grade	Price (inc. VAT)	Pkg. Qty.
A	50FKC-420	1/4"-20	1/2"	7/32"	Flexible Top	Top Lock Jam	Stainless Steel	Grade 18-8	£169.84	50
B	50FK-616	3/8"-16	5/8"	0.282"	Flexible Top	Top Lock Jam	Stainless Steel	Grade 18-8	£350.32	50
C	50FK-518	5/16"-18	9/16"	17/64"	Flexible Top	Top Lock Jam	Stainless Steel	Grade 18-8	£394.25	50

FLEXLOC -

Cadmium Plated Grade 2 Steel Thin Heavy Hex Flexible Top Locknuts

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C

Style	Model	Thread Size	Hex Width	Nut Height	Nut Type	Type	Material	Grade	Price (inc. VAT)	Pkg. Qty.
A	31FK-1608	1"-8	1 1/2"	0.571"	Flexible Top	Top Lock Jam	Steel	Grade 2	£411.90	15
B	31FK-1011	5/8"-11	1"	0.399"	Flexible Top	Top Lock Jam	Steel	Grade 2	£381.15	50
C	31FK-1409	7/8"-9	1 5/16"	0.477"	Flexible Top	Top Lock Jam	Steel	Grade 2	£382.76	20

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Locknuts

Zinc Plated Grade 2 Steel Heavy Hex Nylon Insert Locknuts

Plain Grade 18-8 Stainless Steel Standard Hex Nylon Insert Locknuts

Black Oxide Grade 8 Steel Standard Hex Nylon Insert Locknuts

Zinc Plated Grade 5 Steel Standard Hex Nylon Insert Locknuts

Metric Blue Class 10 Steel Standard Hex Top Lock Distorted Thread Locknuts

NL-19 Grade A4 Stainless Steel Flange Hex Serrated Locknuts

NL-19 Grade 18-8 Stainless Steel Jam Hex Nylon Insert Locknuts

Plain Grade 18-8 Stainless Steel Flange Hex Lock Nut with External Tooth Lock Washers

Zinc Plated Grade A Steel Standard Hex Center Lock Distorted Thread Locknuts

NL-19 Grade 316 Stainless Steel Flange Hex Serrated Locknuts

Plain Grade 18-8 Stainless Steel Standard Light Hex Flexible Top Locknuts

Plain Grade 2 Steel Thin Heavy Hex Flexible Top Locknuts

Zinc Plated Class 8 Steel Flange Hex Serrated Locknuts

Coarse Standard Hex Locknuts with Washer

Plain Grade 2H Steel Standard Hex Slotted Castle Locknuts

Zinc Plated Grade 2 Steel Flange Hex Nylon Insert Locknuts

Phosphate Grade C Steel Flange Hex Top Lock Distorted Thread Locknuts

NL-19 Grade A2 Stainless Steel Standard Hex Nylon Insert Locknuts

NL-19 Grade A4 Stainless Steel Standard Hex Nylon Insert Locknuts

Plain Grade 18-8 Stainless Steel Thin Heavy Hex Flexible Top Locknuts

Cadmium Plated Grade 2 Steel Thin Heavy Hex Flexible Top Locknuts

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