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#4 SEMS Machine Screws (ASME B18. 13)

SEMS® Machine Screws are machine screws with pre-assembled captive washers, designed to speed total assembly time in a manufacturing process.

171 results, (click on any line for more information)

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SupplierLocTypeMaterialFinishSizeDescriptionQty 
Irwin IndOntSems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 1/44-40 x 1/4 pan phil ext. sems m/s 18.8 stainless b18.135035
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Irwin IndOntSems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 3/164-40 x 3/16 pan phil m/s s/s with external l/w sems b18.13885
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Irwin IndOntSems Machine ScrewSteelZinc/Clear#4-40 x 3/164-40 x 3/16 pan phil ext sems m/s trivalent zinc clear b18.133000
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Irwin IndOntSems Machine ScrewSteelZinc/Clear#4-40 x 3/84-40 x 3/8 pan phil ext sems m/s zinc trivalent clear b18.132000
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Irwin IndOntSems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 3/84-40 x 3/8 pan phillips m/s ext sems stainless steel b18.13390
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Irwin IndOntSems Machine ScrewSteelZinc/Clear#4-40 x 1/44-40 x 1/4 pan phil ext sems m/s zinc trivalent clear b18.1320550
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Irwin IndOntSems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 5/164-40 x 5/16 pan phillips ext sems m/s 18.8 s/s b18.13200
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Irwin IndOntSems Machine ScrewSteelZinc/Clear#4-40 x 5/164-40 x 5/16 phil pan int sems m/s zinc b18.1370700
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Irwin IndOntSems Machine ScrewSteelZinc/Clear#4-40 x 1/44-40 x 1/4 pan phillips int sems m/s steel zinc triv clear b18.139000
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Irwin IndOntSems Machine ScrewSteelZinc/Clear#4-40 x 3/164-40 x 3/16 pan phil int sems m/s zinc trivalent clear b18.131450
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Irwin IndOntSems Machine ScrewSteelZinc/Clear#4-40 x 3/84-40 x 3/8 pan phil int sems m/sc zinc trivalent clear b18.1333000
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Irwin IndOntSems Machine ScrewSteelZinc/Black#4-40 x 5/164-40 x 5/16 phil pan sq cone sems m/s blk zinc b18.1355000
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Irwin IndOntSems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 7/164-40 x 7/16 pan phil m/s sems square conical washer 18-8 ss b18.131517
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Irwin IndOntSems Machine ScrewSteelZinc/Clear#4-40 x 1/24-40 x 1/2 pan phil sq. cone sems m/s stl znc trival clr b18.133500
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Irwin IndOntSems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 1/44-40 x 1/4 pan phil split wshr sems m/s stainless steel b18.134000
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Irwin IndOntSems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 1/44-40x1/4 pan phil int. sems m/s 18-8 304 steel b18.1370500
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Irwin IndOntSems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 3/44-40x3/4 pan phil ext tooth sems m/s 18-8 304 steel b18.132400
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Irwin IndOntSems Machine ScrewSteelZinc/Clear#4-40 x 3/84-40x3/8 hex slotted sq cone sems m/s trivalent zinc b18.135000
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Irwin IndOntSems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Zinc/Black#4-40 x 1/44-40x1/4 pan phil ext sems 18.8 18-8 304 zinc triv blk b18.132000
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Irwin IndOntSems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 1/24-40x1/2 pan phil int sems m/s 18.8 s/s b18.132030
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GLFOHSems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 3/16#4-40x3/16 phil pan hd sems external l/w 18-8 s/s b18.13 () () ()750
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BHAMALSems Machine ScrewSteelPlain#4-40 x 3/44-40x3/4 phil pan m/s sems ext. 300 b18.13947
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BHAMALSems Machine ScrewSteelZinc/Clear#4-40 x 14-40x1 phil pan m/s sems ext. zn-rohs b18.1329991
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OptimasILSems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 3/164-40x3/16 ansi b18.13 phil pan sems 18-8 ss nylon patch external l/w sems7945
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GLFOHSems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 3/8#4-40x3/8 phil pan hd sems external l/w 18-8 s/s b18.13 () () ()4000
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AbabaCASems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 14-40 x 1 p-pan sem int wsh m/s s/s b18.131047
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AbabaCASems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 3/164-40 x 3/16 p-pan sems int wsh m/s s/s b18.133000
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AbabaCASems Machine ScrewSteelZinc/Clear#4-40 x 3/164-40 x 3/16 p-pan sems int wsh m/s stl znc b18.132800
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AbabaCASems Machine ScrewSteelZinc/Clear#4-40 x 3/164-40 x 3/16 p-pan sem square cone stl znc b18.13800
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AbabaCASems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 1/44-40 x 1/4 p-pan sems ext wsh m/s s/s b18.133263
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AbabaCASems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 1/44-40 x 1/4 p-pan sems int wsh m/s s/s b18.139387
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AbabaCASems Machine ScrewSteelZinc/Clear#4-40 x 1/44-40 x 1/4 p-pan sems int wsh m/s stl znc b18.132180
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AbabaCASems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 5/164-40 x 5/16 p-pan sem sqr-cn s/s b18.13200
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AbabaCASems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 3/84-40 x 3/8 p-pan sems int wsh m/s s/s b18.135743
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AbabaCASems Machine ScrewSteelZinc/Clear#4-40 x 3/84-40 x 3/8 p-pan sems ext wsh m/s stl znc b18.131400
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AbabaCASems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 7/164-40 x 7/16 p-pan sem square cone s/s b18.13550
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AbabaCASems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 1/24-40 x 1/2 p-pan sems int wsh m/s s/s b18.135325
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AbabaCASems Machine ScrewSteelZinc/Clear#4-40 x 1/24-40 x 1/2 p-pan sems ext wsh m/s stl znc b18.13700
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AbabaCASems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 5/84-40 x 5/8 p-pan sem int wsh m/s s/s b18.133600
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AbabaCASems Machine ScrewSteelZinc/Clear#4-40 x 5/84-40 x 5/8 p-pan int sem stl znc b18.132069
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AbabaCASems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 3/44-40 x 3/4 p-pan sem int wsh m/s s/s b18.133175
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AbabaCASems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 3/84-40 x 3/8 p-pan sem square cone s/s b18.13865
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AbabaCASems Machine ScrewSteelZinc/Clear#4-40 x 3/84-40 x 3/8 p-pan sem int wsh m/s stl znc b18.133200
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ASMCILSems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 1/4#4-40x1/4 (ft) unc sems phil pan ext tooth lockwasher ss18-8 b18.1313,600
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AbabaCASems Machine ScrewSteelZinc/Clear#4-40 x 3/164-40 x 3/16 p-pan sems int wsh m/s stl znc b18.13600
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AbabaCASems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 1/44-40 x 1/4 p-pan sems int wsh m/s s/s b18.1330
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AbabaCASems Machine ScrewSteelZinc/Clear#4-40 x 1/44-40 x 1/4 p-pan sems int wsh m/s stl znc b18.13400
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AbabaCASems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 3/84-40 x 3/8 p-pan sems int wsh m/s s/s b18.13100
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AbabaCASems Machine ScrewSteelZinc/Clear#4-40 x 5/84-40 x 5/8 p-pan int sem stl znc b18.13100
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EximS'poreSems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Zinc/Clear#4-40 x 05/16screw lock kit steel blue znstandoff assy w.ext tooth l/washer small# 4-40 x 0.312 in (kits 30000) b18.13820
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EximS'poreSems Machine ScrewSteelZinc/Clear#4-40 x 05/16screw lock kit steel blue trivalentstandoff assy w.ext tooth l/washer small#4-40 x 0.312 in [rohs] b18.1317685
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EximS'poreSems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Zinc/Clear#4-40 x 05/16screw lock kit steel blue trivalentstandoff assy w.ext tooth l/washer small#4-40 x 0.312 in [rohs] (kits 30000) b18.1329505
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EximS'poreSems Machine ScrewSteelZinc/Clear#4-40 x 7/8screw pan head phillips-recesssteel blue zn w. int tooth lockwasher# 4-40 x 7/8 in b18.1310000
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EximS'poreSems Machine ScrewSteelZinc/Yellow#4-40 x 3/4screw pan head phillips-recesssteel yellow zn w. ext tooth lockwasher# 4-40 x 3/4 in b18.136123
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EximS'poreSems Machine ScrewSteelZinc/Yellow#4-40 x 1 1/4screw pan head phillips-recesssteel yellow zn w. ext tooth lockwasher# 4-40 x 1-1/4 in. b18.1347210
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EximS'poreSems Machine ScrewSteelZinc/Clear#4-40 x 3/16screw hex headsteel blue zn unc 2a w. ext tooth l/w# 4-40 x 3/16 in b18.1311316
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EximS'poreSems Machine ScrewSteelZinc/Clear#4-40 x 7/32screw pan head phillips-recesssteel blue zn w. square cone washer# 4-40 x 7/32 in b18.135890
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EximS'poreSems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Passivated#4-40 x 3/16screw pan head phillips-recesss/s passivated w. split lock washer# 4-40 x 3/16 in b18.1374407
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EximS'poreSems Machine ScrewSteelZinc/Clear#4-40 x 3/16screw pan head phillips-recesssteel blue zn w. int tooth l/washer# 4-40 x 3/16 in b18.1360835
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EximS'poreSems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Passivated#4-40 x 3/16screw pan head pozidrivs/s passivated w.exe tooth l/wsher# 4-40 x 3/16 in unc 2a b18.136118
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EximS'poreSems Machine ScrewSteelZinc/Clear#4-40 x 1/8screw hex headsteel blue zn unc 2a w. ext tooth l/w# 4-40 x 1/8 in b18.1336100
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EximS'poreSems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Passivated#4-40 x 3/16screw pan head phillips-recesss/s passivated w. ext tooth l/washer# 4-40 x 3/16 in b18.1325770
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EximS'poreSems Machine ScrewSteelZinc/Clear#4-40 x 3/16screw pan head phillips-recesssteel clr zn unc 2a ext tooth l/washer# 4-40 x 3/16 in b18.13160
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EximS'poreSems Machine ScrewSteelZinc/Clear#4-40 x 3/16screw pan head phillips-recesssteel blue zn w. split lockwasher# 4-40 x 3/16 in b18.133710
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EximS'poreSems Machine ScrewSteelZinc/Clear#4-40 x 3/16screw pan head phillips-recesssteel blue zn w. square cone washer# 4-40 x 3/16 in b18.1361660
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EximS'poreSems Machine ScrewSteelZinc/Clear#4-40 x 1/4screw pan head slottedsteel blue zn w. ext tooth lockwasher# 4-40 x 1/4 in b18.139710
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EximS'poreSems Machine ScrewSteelZinc/Clear#4-40 x 1/4screw hex head (regular head)steel blue zn w. ext. tooth lockwasher# 4-40 x 1/4 in b18.13106980
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EximS'poreSems Machine ScrewSteelZinc/Clear#4-40 x 1/4screw hex head steel blue trivalentw. ext tooth lockwasher# 4-40 x 1/4 in [rohs] b18.1321725
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EximS'poreSems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Passivated#4-40 x 1/4screw pan head pozidrivs/s passivated w.ext tooth l/washer# 4-40 x 1/4 in unc 2a b18.1321206
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JET FITTINGCASems Machine ScrewSteelZinc/Black#4-40 x 3/84-40x3/8 phillips pan sem screw external 6-lobe steel zinc black FXP4C37XB/TT-3 b18.1314460
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JET FITTINGCASems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 1/24-40x1/2 phillips pn dbl sem 18-8 (nas1301c4-8) b18.134100
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JET FITTINGCASems Machine ScrewSteelPlain#4-40 x 1/24-40x1/2 phillips pn sq cone sems stl zi 4-40 x 1/2 PH PN SQ CONE SEMS STL ZI b18.1310000
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JET FITTINGCASems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 5/164-40x5/16 phillips pan square cone sem screw stainless steel 18-8 43753 b18.13850
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JET FITTINGCASems Machine ScrewSteelPlain#4-40 x 1/44-40x1/4 phillips pn x-sems stl zi 593051 b18.1337139
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JET FITTINGCASems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 3/84-40x3/8 phillips pan sem screw square cone stainless steel 18-8 plain SXP4C37SX/SQ b18.131000
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JET FITTINGCASems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 1/44-40x1/4 phillips pan sem screw split stainless steel 18-8 plain 0404SPP188 b18.134050
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JET FITTINGCASems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 5/84-40x5/8 phillips pn dbl sem 18-8 (nas1301c4-10) b18.133600
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JET FITTINGCASems Machine ScrewSteelPlain#4-40 x 3/84-40x3/8 phillips pn i-sems st zi 4-40 X 3/8 PH PAN INT SEMS b18.1312550
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JET FITTINGCASems Machine ScrewSteelZinc/Clear#4-40 x 3/164-40x3/16 phillips pn ms ext sems zinc 0403EPP b18.139791
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JET FITTINGCASems Machine ScrewSteelPlain#4-40 x 3/84-40x3/8 phillips pn sq cone sems stl zi 4-40 x 3/8 PH PN SQ CONE SEMS STL ZI b18.1310000
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JET FITTINGCASems Machine ScrewSteelPlain#4-40 x 1/44-40x1/4 phillips pn sq cone sems stl zi 0404PPSQZ b18.136500
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QFCTXSems Machine ScrewSteelZinc/Clear#4-40 x 1 1/2#4-40x1 1/2 phill pan ext sem m/s z b18.135400
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QFCTXSems Machine ScrewSteelZinc/Clear#4-40 x 3/164-40x3/16 pan phil sq cone sems trivalent zinc b18.1318697
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QFCTXSems Machine ScrewSteelPlain#4-40 x 3/164-40x3/16 phil pan ext sem screw b18.134000
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QFCTXSems Machine ScrewSteelPlain#4-40 x 3/164-40x3/16 phil pan ext sem screw b18.133100
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QFCTXSems Machine ScrewSteelZinc/Black#4-40 x 3/164-40x3/16 phil pan ext sem screw bz b18.133300
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QFCTXSems Machine ScrewSteelZinc/Clear#4-40 x 3/164-40x3/16 phil pan int sem screw zinc b18.133250
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QFCTXSems Machine ScrewSteelZinc/Clear#4-40 x 1/44-40x1/4 phil pan square cone sems tri-zinc b18.132500
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QFCTXSems Machine ScrewSteelZinc/Clear#4-40 x 1/44-40x1/4 phil pan square cone sems tri-zinc b18.134000
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QFCTXSems Machine ScrewSteelPlain#4-40 x 1/44-40x1/4 phil pan int sem screw black b18.131671
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QFCTXSems Machine ScrewSteelZinc/Clear#4-40 x 1/44-40x1/4 phil pan int sem screw zinc b18.131992
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QFCTXSems Machine ScrewSteelPlain#4-40 x 1/44-40x1/4 slotted pan ext sem screw b18.133350
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QFCTXSems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 5/164-40x5/16 phil pan ext sem screw ss b18.132000
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QFCTXSems Machine ScrewSteelPlain#4-40 x 5/164-40x5/16 phil pan ext sem screw b18.1310783
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QFCTXSems Machine ScrewSteelPlain#4-40 x 5/164-40x5/16 phil pan int sem screw b18.132000
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QFCTXSems Machine ScrewSteelPlain#4-40 x 5/164-40x5/16 pan phillips split lock sems b18.131118
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QFCTXSems Machine ScrewSteelPlain#4-40 x 5/164-40x5/16 slotted pan ext sem screw b18.134700
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QFCTXSems Machine ScrewSteelPlain#4-40 x 3/84-40x3/8 hex slotted square cone sems b18.13400
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QFCTXSems Machine ScrewSteelPlain#4-40 x 3/84-40x3/8 pan phillips square cone sems b18.132500
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QFCTXSems Machine ScrewSteelPlain#4-40 x 3/84-40x3/8 pan phillips square cone sems b18.139870
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QFCTXSems Machine ScrewSteelPlain#4-40 x 3/84-40x3/8 pan phil sq cone sems black b18.131622
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CascadeORSems Machine ScrewSteelZinc/Clear#4-40 x 1/4pan phillips extern sems b18.1323100
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General FMISems Machine ScrewSteelZinc/Clear#4-40 x 5/84-40 x .625 pn phil sems ext lw zn b18.136685
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General FMISems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 3/84-40 x .375 pn phil dbl sems ms 18-8 b18.1332187
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OSSCORISems Machine ScrewSteelPlain#4-40 x 3/84-40x3/8 phil pan sem/ext tooth b18.13600
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OSSCORISems Machine ScrewSteelZinc/Clear#4-40 x 1/44-40x1/4 phil pan m/s external tooth sems plated b18.131,541
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QFCTXSems Machine ScrewSteelZinc/Clear#4-40 x 1/44-40 x 1/4 phil pan ext sems m/s zinc b18.139000
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QFCTXSems Machine ScrewSteelZinc/Yellow#4-40 x 3/164-40 x 3/16 pan phil sq cone sems zy b18.13600
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QFCTXSems Machine ScrewSteelZinc/Clear#4-40 x 1/44-40 x 1/4 phil pan ext sem screw zinc b18.1319000
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QFCTXSems Machine ScrewSteelZinc/Yellow#4-40 x 5/164-40x5/16 phillps pan square cone sem zy b18.135178
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QFCTXSems Machine ScrewSteelPlain#4-40 x 3/84-40 x 3/8 hex hd slotted square cone sems b18.13900
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QFCTXSems Machine ScrewSteelZinc/Clear#4-40 x 7/164-40x7/16 phillips pan external sem zinc b18.135000
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QFCTXSems Machine ScrewSteelPlain#4-40 x 3/44-40 x 3/4 phil pan ext sem screw b18.132975
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QFCTXSems Machine ScrewSteelPlain#4-40 x 1/24-40 x 1/2 phil pan ext sem screw b18.13500
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QFCTXSems Machine ScrewSteelZinc/Yellow#4-40 x 1/24-40x1/2 pan phil square cone sems zy b18.132500
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QFCTXSems Machine ScrewSteelZinc/Clear#4-40 x 1/24-40 x 1/2 pan torx sq cone sems zinc b18.1375502
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JET FITTINGCASems Machine ScrewSteelZinc/Clear#4-40 x 3/16sem ext pan phillips 440x3/16 steel zinc plated b18.132050
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JET FITTINGCASems Machine ScrewSteelZinc/Clear#4-40 x 1/4sem ext pan phillips 440x1/4 steel zinc plated b18.136400
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JET FITTINGCASems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 5/16sem s cone pan phillips 440x5/16 stainless steel b18.1332
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JET FITTINGCASems Machine ScrewSteelZinc/Clear#4-40 x 5/16sem s cone pan phillips 440x5/16 steel zinc plated b18.134800
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JET FITTINGCASems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 3/8sem int pan phillips 440x3/8 stainless steel b18.13746
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JET FITTINGCASems Machine ScrewSteelZinc/Clear#4-40 x 3/8sem ext pan phillips 440x3/8 steel zinc plated b18.13895
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JET FITTINGCASems Machine ScrewSteelZinc/Clear#4-40 x 3/8sem s cone pan phillips 440x3/8 steel zinc plated b18.13500
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JET FITTINGCASems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Black Oxide#4-40 x 1/24-40x1/2 phillips pan internal star lock washer sems screw stainless steel 18-8 black oxide b18.131000
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JET FITTINGCASems Machine ScrewSteelZinc/Clear#4-40 x 5/8sem s cone pan phillips 440x5/8 steel zinc plated b18.131000
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JET FITTINGCASems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 1sem int pan phillips 440x1 stainless steel b18.1370
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JET FITTINGCASems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 1/44-40x1/4 double sems screws narrow flat & split washers phillips pan head 18-8 stainless steel quantity 5000 b18.135000
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JET FITTINGCASems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 1/44-40x1/4 double sems screws regular flat & split washers phillips pan head 18-8 stainless steel quantity 5000 b18.135000
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JET FITTINGCASems Machine ScrewSteelZinc/Clear#4-40 x 5/16sem ext pan phillips 440x5/16 steel zinc plated b18.138000
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JET FITTINGCASems Machine ScrewSteelZinc/Clear#4-40 x 3/8sem int pan phillips 440x3/8 steel zinc plated b18.135000
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JET FITTINGCASems Machine ScrewSteelZinc/Clear#4-40 x 3/8sem s cone pan phillips 440x3/8 steel zinc plated b18.13750
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JET FITTINGCASems Machine Screw300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4-40 x 1/2sem s cone pan phillips 440x1/2 stainless steel b18.13300
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JET FITTINGCASems Machine ScrewSteelZinc/Clear#4-40 x 3/4sem int pan phillips 440x3/4 steel zinc plated b18.135136
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