Tapered Series | Polymer Molding

Home / Products / Plugs / Tapered Series

Tapered Plugs

The Tapered Series can be used as either a plug or cap* depending on the application. Unlike rigid options, these tapered rubber plugs flex to create a tighter seal that adapts to slight variations in size or shape.

Excellent for protecting threads and keeping unwanted contamination out of pipes, valves, tubing and most other cylindrical openings. Their multifunctional design allows these tapered plugs to fit a wide range of diameters, reducing inventory needs and simplifying production workflows.

The most economical solution for protecting standard size threads, unified threads, N.P.T. and metric size fittings or ports. Engineers rely on the Tapered Series for its dependable sealing performance, repeated usability, and superior resistance to heat and pressure in critical manufacturing environments.

Refer to Cap sizes HERE.

Typical wall thickness .032
Color: Red
Material: Low Density Polyethylene
LDPE service temperature: 150° F (66° C)
Applicable specs: MIL-C-5501/7 (MIL-C-52078), NAS-834
Most sizes available in thermoplastic rubber for higher heat applications
Thermoplastic rubber service temperature: 275° F (135° C)
RoHS Compliant

Product Options

Please confirm that your Part Number is correct and adjust the other selections below to meet your application's requirements.

Part Number

Package Size

Clear

Make Your Selection Below

PART NO.	COLOR	COMMON APPLICATION	C	D	E	F	PRODUCT OPTIONS
PART NO.	COLOR	COMMON APPLICATION	in.	mm.	in.	mm.	PRODUCT OPTIONS		in.	mm.	in.	mm.
#1	Red	N/A	0.115	2.921	0.176	4.470	0.403	10.236	0.311	7.899	Carton	25,000	1	1,000	100	405.00	50.90	17.78
#2	Red	N/A	0.140	3.556	0.205	5.207	0.375	9.525	0.377	9.576	Carton	25,000	1	1,000	100	405.00	50.90	17.78
#3	Red	N/A	0.172	4.369	0.233	5.918	0.379	9.627	0.375	9.525	Carton	25,000	1	1,000	100	405.00	50.90	17.78
#4	Red	N/A	0.187	4.750	0.251	6.375	0.377	9.576	0.372	9.449	Carton	25,000	1	1,000	100	405.00	50.90	17.78
#5	Red	N/A	0.209	5.309	0.266	6.756	0.379	9.627	0.435	11.049	Carton	20,000	1	1,000	100	324.00	50.90	17.78
#6	Red	5/16 Std Thr	0.237	6.020	0.293	7.442	0.381	9.677	0.473	12.014	Carton	15,000	1	1,000	100	243.00	50.90	17.78
#7	Red	N/A	0.265	6.731	0.330	8.382	0.375	9.525	0.470	11.938	Carton	15,000	1	1,000	100	243.00	50.90	17.78
#8	Red	3/8 Std Thr	0.296	7.518	0.368	9.347	0.385	9.779	0.533	13.538	Carton	25,000	1	1,000	100	405.00	50.90	17.78
#9	Red	1/8 NPT	0.325	8.255	0.397	10.084	0.377	9.576	0.559	14.199	Carton	22,500	1	1,000	100	393.75	55.20	19.30
#10	Red	7/16 Std Thr	0.357	9.068	0.427	10.846	0.380	9.652	0.579	14.707	Carton	20,000	1	1,000	100	350.00	55.20	19.30
#11	Red	N/A	0.383	9.728	0.460	11.684	0.377	9.576	0.620	15.748	Carton	17,000	1	1,000	100	300.90	55.90	19.58
#12	Red	1/4 NPT, 1/2 Std Thr	0.423	10.744	0.488	12.395	0.380	9.652	0.596	15.138	Carton	17,000	1	1,000	100	300.90	55.60	19.44
#13	Red	N/A	0.447	11.354	0.512	13.005	0.374	9.500	0.625	15.875	Carton	15,000	1	1,000	100	277.50	58.30	20.40
#14	Red	9/16 Std Thr	0.474	12.040	0.554	14.072	0.498	12.649	0.719	18.263	Carton	9,000	1	1,000	100	166.50	58.30	20.37
#15	Red	N/A	0.495	12.573	0.577	14.656	0.438	11.125	0.750	19.050	Carton	9,000	1	1,000	100	198.00	69.30	24.28
#16	Red	5/8 Std Thr	0.529	13.437	0.623	15.824	0.501	12.725	0.752	19.101	Carton	7,500	1	1,000	100	138.75	58.30	20.40
#17	Red	3/8 NPT	0.548	13.919	0.630	16.002	0.500	12.700	0.784	19.914	Carton	7,500	1	1,000	100	149.25	62.30	21.79
#18	Red	N/A	0.588	14.935	0.676	17.170	0.529	13.437	0.877	22.276	Carton	5,000	1	1,000	100	99.50	62.30	21.79
#19	Red	N/A	0.603	15.316	0.694	17.628	0.495	12.573	0.839	21.311	Carton	6,000	1	1,000	100	119.40	62.30	21.79
#20	Red	3/4 Std Thr	0.629	15.977	0.728	18.491	0.492	12.497	0.872	22.149	Carton	6,000	1	1,000	100	127.20	67.00	23.40
#21	Red	N/A	0.672	17.069	0.755	19.177	0.500	12.700	0.875	22.225	Carton	5,000	1	1,000	100	106.00	67.00	23.43
#22	Red	1/2 NPT	0.690	17.526	0.779	19.787	0.620	15.748	0.938	23.825	Carton	4,000	1	1,000	100	90.80	71.40	24.99
#23	Red	N/A	0.730	18.542	0.827	21.006	0.502	12.751	1.004	25.502	Carton	4,500	1	1,000	100	116.10	81.20	28.41
#24	Red	7/8 Std Thr	0.752	19.101	0.849	21.565	0.621	15.773	1.032	26.213	Carton	6,000	1	1,000	100	146.40	76.80	26.89
#25	Red	N/A	0.800	20.320	0.914	23.216	0.747	18.974	1.024	26.010	Carton	5,000	1	1,000	100	129.50	81.20	28.37
#26	Red	N/A	0.812	20.625	0.933	23.698	0.620	15.748	1.123	28.524	Carton	5,000	1	1,000	100	146.50	92.20	32.27
#27	Red	3/4 NPT	0.867	22.022	0.971	24.663	0.747	18.974	1.130	28.702	Carton	4,500	1	1,000	100	131.85	92.20	32.27
#27X	Red	3/4 NPT	0.869	22.073	0.974	24.740	0.629	15.977	1.127	28.626	Carton	5,000	1	1,000	100	146.50	92.20	32.27
#28	Red	1 1/16 Std Thr	0.893	22.682	1.038	26.365	0.620	15.748	1.153	29.286	Carton	5,000	1	1,000	100	163.50	102.80	35.99
#30	Red	N/A	0.955	24.257	1.092	27.737	0.747	18.974	1.243	31.572	Carton	3,500	1	500	50	127.40	57.05	20.00
#29	Red	N/A	0.984	24.994	1.054	26.772	0.500	12.700	1.253	31.826	Carton	2,500	1	500	50	81.75	51.40	17.99
#31	Red	N/A	0.993	25.222	1.137	28.880	0.749	19.025	1.306	33.172	Carton	3,500	1	500	50	128.10	57.60	20.13
#37X	Red	N/A	1.085	27.559	1.358	34.493	0.835	21.209	1.560	39.624	Carton	2,000	1	500	50	258.60	203.30	71.16
#32	Red	1 NPT	1.098	27.889	1.217	30.912	0.740	18.796	1.497	38.024	Carton	2,500	1	500	50	91.50	57.60	20.13
#33	Red	N/A	1.166	29.616	1.279	32.487	0.743	18.872	1.431	36.347	Carton	2,500	1	500	50	97.50	61.50	21.51
#34	Red	1 5/16 Std Thr	1.219	30.963	1.351	34.315	0.746	18.948	1.497	38.024	Carton	2,500	1	500	50	101.25	63.65	22.27
#35	Red	N/A	1.236	31.394	1.359	34.519	0.749	19.025	1.497	38.024	Carton	2,500	1	500	50	104.00	65.40	22.89
#36	Red	N/A	1.289	32.741	1.352	34.341	0.377	9.576	1.504	38.202	Carton	2,000	1	500	50	87.20	68.60	24.01
#37	Red	N/A	1.312	33.325	1.465	37.211	0.750	19.050	1.625	41.275	Carton	2,000	1	500	50	95.60	75.25	26.34
#38	Red	N/A	1.346	34.188	1.513	38.430	0.995	25.273	1.751	44.475	Carton	1,300	1	200	20	62.53	30.26	10.60
#39	Red	1 1/4 NPT	1.452	36.881	1.593	40.462	0.741	18.821	1.748	44.399	Carton	1,800	1	200	20	86.58	30.26	10.60
#40X	Red	N/A	1.516	38.506	1.601	40.665	0.748	18.999	1.753	44.526	Carton	1,700	1	200	20	85.85	30.26	10.59
#40	Red	1 5/8 Std Thr	1.519	38.583	1.596	40.538	0.496	12.598	1.749	44.425	Carton	2,500	1	200	20	120.25	30.26	10.59
#41	Red	1 3/4 Std Thr	1.559	39.599	1.683	42.748	0.739	18.771	1.874	47.600	Carton	1,500	1	200	20	75.75	31.76	11.12
#42	Red	N/A	1.627	41.326	1.757	44.628	0.743	18.872	2.004	50.902	Carton	1,200	1	200	20	70.44	36.96	12.94
#43	Red	1 1/2 NPT, 1 7/8 Std Thr	1.741	44.221	1.873	47.574	0.739	18.771	2.050	52.070	Carton	1,200	1	200	20	80.88	42.38	14.84
#42X	Red	N/A	1.790	45.466	1.815	46.101	0.405	10.287	1.995	50.673	Carton	2,000	1	200	20	134.80	42.38	14.83
#44	Red	N/A	1.806	45.872	1.933	49.098	0.995	25.273	2.109	53.569	Carton	900	1	200	20	61.74	43.18	15.12
#45	Red	N/A	1.835	46.609	2.010	51.054	0.984	24.994	2.185	55.499	Carton	900	1	200	20	66.69	46.85	16.30
#46	Red	N/A	1.903	48.336	2.076	52.730	0.995	25.273	2.244	56.998	Carton	850	1	200	20	59.28	46.58	16.30
#47	Red	N/A	1.982	50.343	2.015	51.181	0.995	25.273	2.255	57.277	Carton	800	1	200	20	71.12	55.86	19.50
#48	Red	N/A	1.998	50.749	2.140	54.356	0.742	18.847	2.320	58.928	Carton	1,000	1	200	20	96.90	60.98	21.35
#49	Red	2 1/4 Std Thr	2.069	52.553	2.240	56.896	0.994	25.248	2.500	63.500	Carton	700	1	100	10	74.90	33.64	11.78
#52	Red	N/A	2.134	54.204	2.380	60.452	0.994	25.248	2.481	63.017	Carton	700	1	200	20	84.28	75.64	26.47
#51	Red	N/A	2.162	54.915	2.343	59.512	1	25.400	2.640	67.056	Carton	600	1	100	10	66.24	34.74	12.17
#50	Red	2 NPT	2.215	56.261	2.260	57.404	0.491	12.471	2.473	62.814	Carton	1,200	1	200	20	132.48	69.48	24.32
#53	Red	N/A	2.301	58.445	2.457	62.408	0.995	25.273	2.621	66.573	Carton	600	1	100	10	74.88	39.24	13.74
#56	Red	N/A	2.306	58.572	2.654	67.412	0.997	25.324	2.747	69.774	Carton	700	1	100	10	96.67	43.46	15.22
#54	Red	N/A	2.400	60.960	2.600	66.040	1	25.400	2.812	71.425	Carton	500	1	100	10	62.40	39.24	13.74
#57	Red	N/A	2.475	62.865	2.750	69.850	1	25.400	2.875	73.025	Carton	600	1	100	10	90.24	47.28	16.54
#55	Red	N/A	2.486	63.144	2.632	66.853	0.745	18.923	2.738	69.545	Carton	700	1	100	10	90.44	40.57	14.21
#58	Red	N/A	2.567	65.202	2.679	68.047	0.997	25.324	2.874	73.000	Carton	450	1	100	10	67.68	47.28	16.55
#59	Red	2 1/2 NPT	2.648	67.259	2.796	71.018	0.746	18.948	3.008	76.403	Carton	600	1	100	10	92.76	48.67	17.03
#61	Red	N/A	2.759	70.079	3.003	76.276	1	25.400	3.115	79.121	Carton	500	1	100	10	81.35	51.21	17.93
#60	Red	3 Std Thr	2.862	72.695	2.983	75.768	0.749	19.025	3.265	82.931	Carton	500	1	100	10	81.35	51.19	17.92
#61X	Red	N/A	2.977	75.616	3.103	78.816	0.783	19.888	3.344	84.938	Carton	400	1	100	10	58.48	45.98	19.88
#62	Red	N/A	3.002	76.251	3.145	79.883	0.743	18.872	3.363	85.420	Carton	500	1	100	10	80.60	50.66	17.93
#63	Red	N/A	3.004	76.302	3.251	82.575	0.999	25.375	3.394	86.208	Carton	400	1	100	10	72.28	56.80	19.88
#64	Red	N/A	3.099	78.715	3.377	85.776	0.993	25.222	3.496	88.798	Carton	400	1	100	10	72.56	57.04	19.96
#66	Red	N/A	3.291	83.591	3.600	91.440	0.999	25.375	4.009	101.829	Carton	300	1	50	5	84.18	37.80	13.24
#65	Red	3 NPT	3.334	84.684	3.461	87.909	0.752	19.101	3.633	92.278	Carton	400	1	50	5	80.68	31.71	11.11
#67	Red	N/A	3.468	88.087	3.620	91.948	0.746	18.948	3.991	101.371	Carton	350	1	50	5	93.59	42.04	14.71
#68	Red	N/A	3.680	93.472	3.800	96.520	0.750	19.050	4	101.600	Carton	300	1	50	5	85.50	44.83	15.65
#69	Red	3 1/2 NPT	3.806	96.672	3.938	100.025	0.745	18.923	4.150	105.410	Carton	300	1	50	5	92.22	48.32	16.91
#70	Red	N/A	3.926	99.720	4.072	103.429	0.737	18.720	4.368	110.947	Carton	300	1	50	5	9,222.00	48.32	16.91
#70X	Red	N/A	3.941	100.101	4.085	103.759	0.790	20.066	4.400	111.760	Carton	250	1	50	5	80.15	48.32	16.91
#71	Red	N/A	4.042	102.667	4.155	105.537	0.750	19.050	4.499	114.275	Carton	250	1	50	5	83.50	52.51	18.38
#72	Red	4 NPT	4.240	107.696	4.463	113.360	1.002	25.451	5.020	127.508	Carton	300	1	50	5	122.34	64.09	22.44
#73	Red	N/A	4.366	110.896	4.622	117.399	0.997	25.324	4.985	126.619	Carton	250	1	50	5	101.95	64.09	22.44
#80	Red	N/A	4.621	117.373	4.830	122.682	0.935	23.749	5.220	132.588	Carton	150	1	50	5	113.84	119.28	41.75
#83	Red	N/A	4.928	125.171	5.104	129.642	1.050	26.670	5.540	140.716	Carton	100	1	25	5	93.32	73.39	51.38
#90	Red	N/A	8.150	207.010	8.350	212.090	1.420	36.068	8.750	222.250	Carton	30	1	10	5	55.42	64.65	80.00

More Options

Pull Ring Plugs

PR Series

Pull Plugs

P Series

Electrical Connector Plugs

YP Series

Sheet Metal Plugs

F&R Series

Flared Fitting Plugs

FP Series

Flat Fitting Plugs for ORFS Fittings

FFP Series

Push In Plugs

PI Series

Universal Plugs

UP Series

Threaded Hydraulic Plugs

HP Series

Long Threaded Hydraulic Plugs

HPL Series

Heavy Duty Long Threaded Hydraulic Plugs

HPL Nylon Series

Silicone Rubber Plugs

SLP Series

Silicone Pull Plugs

SLPP Series

Silicone Flangeless Plugs

SFP Series

Dual Washer Pull Plugs

DWPP Series

Dual Silicone Washer Plugs

DSWP Series

Silicone Dual Plugs

SDP Connector

Silicone Flanged Pull Plugs

SFPP Series

Silicone Flanged Masking Plugs

SFMP Series

Silicone Multi-Flanged Plugs

SMFP Series

Silicone Mouse Tail Plugs

SMTP Series

Silicone Hollow Tapered Plugs

SHTP Series

Silicone Hollow Tapered Plugs with Pull Tabs

SHPT Series

Silicone Flanged Plugs

SLFP Series

Silicone Thick Flanged Plugs

STFP Series

Silicone Washer Pull Plugs

SWPP Series

Plastic Pipe Plugs

SPPT Series

Square Tubing Inserts

STI Series

Round Tubing Inserts

RTI Series

Rectangular Tubing Inserts

REC Series

Committed to a Better Customer Experience

When you call Polymer Molding Inc. during normal business hours, your call will be answered by a live person, every time. It is our sincere commitment to lead the market in exceptional customer service, because you deserve to do business with a company that truly cares about you and your product needs. Our knowledgeable, friendly and helpful sales and customer service representatives will take the time to help you select the best parts for your applications at the most competitive prices in the industry. We are here to answer questions, process your orders, and prepare your shipments quickly and efficiently. Click the button below to compare our pricing and see the Polymer Molding difference.

Request Pricing